civil engineering web

9 Method of Demolition and Process for Building structures

In this article, we explained the definition of demolition, demolition requirement, demolition plan, surveys for demolition, various method of demolition, implosion building demolition, pile hacking, factors affecting the selection of demolition, safety measures during demolition.

Table of Contents

What is Demolition?

Demolition means removing any building structure or part of it in a pre-planned and controlled manner. 

Demolition is defined as destroying old buildings in a controlled manner when the design life of the building completed. Definition of Demolition

Here to things is important for demolition. First Design life, Second is a destroying of old building in a controlled manner. Second thing is important for selection of demolition techniques.

This two things are a major factors which affect the demolition of building.

Demolition is done to ensure that the area around the building is not damaged or affected due to demolition. 

Demolition Requirement:

Demolition is required in the following cases:

Survey for Demolition:

Detailed surveys and evaluations are required for the demolition of any building. The building survey includes the following:

1.  Building Survey:

2. Structural Survey:

Demolition Plan:

For demolition approval, demolition plan is prepared on the basis of building survey. This plan is submitted to the local authority along with the application for demolition approval. 

Demolition plan include the following thimgs:

Factors Affecting Selection of Demolition Method:

The following factors should be taken into consideration while choosing the method of demolition:

1. Type of demolition:

The method of demolition depends on the type of structure. 

Demolition methods vary for different types of structure such as load bearing structure, RCC Framed structure, steel structure etc. 

2. Size of the structure:

If the size of the structure is small, no special method is required for demolition. Hand demolition can be done. Special technique is required if the structure is large. 

3. Duration:

Choose the method of demolition keeping in view the time frame available for the demolition. 

4. Location of structure

5. Noise, dust, company limits

6. Available machines

7. Skills of labours

8.  Safety

9. Surrounding Structures

10. Behavior of Structures, etc. 

Demolition Techniques

Some techniques used for demolition are given in table.

1. Manual Demolition:

Manual demolition is also known as hand demolition.

This method of demolition is especially useful for breaking small structures in densely populated areas.

Manual Demolition of structures is done by laborers by hand.

Large machinery cannot go to the site as it is a crowded area. 

To do this demolition method, use the following tools:

In this method of demolition, the demolition of the building is done from top to bottom. 

Jack hammers are used to break concrete components such as beams, columns, slabs, etc.  Oxy-acetylene torch is used to cut reinforcement steel. 

A chute or skip is used to bring down debris from top floor to bottom. 

If the distance of the edge of the nearest road from the building is more than 6 m (or half of the height of the building) then debris can be allowed to fall freely from the upper floor.

Sequence of manual demolition:

2. Wrecking Ball Method:

wrecking ball method of demolition

In this method of demolition, a steel ball weighing 0.5 to 2.0 tons is hung from a crawler mounted crane. 

The impact of these steel balls breaks the concrete or machinery. 

Two techniques are used in this method:

This method requires an experienced operator to handle the wrecking ball. 

The building that is to be demolished must have open space for Crane movement around it. 

If the building is to be demolished from the inside, the interior of the building must first be demolished to make the necessary space.

3.  Pusher Arm Technique:

In this method of demolition, a machine like a “hydraulic excavator” is lifted with a steel pusher arm and pushed from the outside surface of the building. 

In this way the machine should have a rigid base for operation from the ground.  Also the distance from the building to the edge of the road should be at least 6.0 m,

If the buildings are connected to each other, the building to be demolished is separated from the adjacent building by hand demolition. 

View this post on Instagram A post shared by Techio Civil (@techiocivil7)

4. Thermic Lance Technique:

thermic lance method of demolition

In this method of demolition, concrete and reinforcement steel are broken by melting at high temperature.  In this way a temperature of 2000 ◦ to 4000 ◦ C is produced. 

In pipes of aluminium alloy or iron alloy 14 to 18 mm diameter, wires of aluminium alloy or iron alloy are kept. 

First, the metal lance is ignited by the flow of acetylene gas between the wires. Acetylene gas is converted to oxygen and the metal lance burns.

Causing the concrete and steel reinforcement to slowly melt and break. 

“Powered lances” are often used instead of metal lances.

This way special measures need to be taken for safety. 

This method is adopted only when other methods of demolition cannot be used.

5. Concrete Sawing Method:

concrete sawing method of demolition

This method of demolition is especially useful when the building is being demolished and repaired. 

Useful where precision is required as well as control of noise, vibrations etc. are very necessary. 

This method is useful when making opening in a slab or wall, braking concrete in the basement, service tunnel, flyover etc. 

The following methods are used for saw cutting: 

1. Wire saw cutting:

It uses diamond bit with loop wire saw.  This method is suitable for foundation and mass concrete. 

2. Diamond disc cutter:

This type of cutter is available in diameter of 1000 mm which is used for cutting concrete. 

It was used for the demolition of a telegraph station building in Japan. 

3. Diamond core boring machine:

Holes of 100 mm to 150 mm diameter can be drilled in concrete by using this machine. 

Concrete can be easily cut by dealing close to the hole. 

This method is useful in nuclear power plants. 

6. Deliberate Collapse Method:

In this method of demolition, the key structural elements of the building are systematically removed or weakened so that the structure can be deliberately lowered. 

This method is used only for the demolition of a building that is isolated from the surrounding building, plus the ground level should be almost level. 

7.  Pressure Jetting Method:

In this method of demolition, water jet is released from the nozzle at high pressure (250 – 300mPa) on the concrete surface.  This jet cuts plain concrete due to abrasion. 

An abrasive water jet is used to cut the RCC.  In which garnet or steel particles cut the concrete. 

This method has been developed for the demolition of nuclear power plants. 

The rear area of ​​the visual element that is to be broken by the water jet should be shielded so as not to damage individuals and property. 

Water used in water jets should be recycled and reusable. 

8. Bursting:

In this method of demolition, the building is dismantled by generating bursting force from outside on the building. 

Two types of this method.

Burster with wedges:

In this method of demolition, bore holes are drill in concrete. In which mechanical wedges are inserted so that the concrete breaks due to expansion. 

This method is used to break plain concrete and machinery. 

Chemical expansive demolition agent:

In this method bore holes are drill in concrete.  In this bore hole unslaked lime (chemical expansive agent) is ejected with water. 

This mixture is expand due to hydration which breaks down the concrete. 

In this method of demolition water is released in the bore hole at a pressure of 40 mPa.  Concrete slitting occurs due to water pressure. 

Gas cylinder:

In this method of demolition, flexible gas pipe with bore hole is fitted with rubber stopper which is attached to inorganic gas vessel. 

Then opening the gas valve creates gas pressure in the bore hole and the concrete cracks . 

In this method liquid carbon dioxide (CO 2 ) is filled in a metallic tube and inserted into the borehole. 

This tube is heated by an electric filament. So that it expands and spoils the concrete. 

Mild explosives:

In this way holes are drill in the column. Dynamite is placed in this hall.  Dynamite is arranged in such a way that the structure falls inwards. 

9. Implosion Technique:

“Implosion” means an event where an external pressure is greater than the internal pressure when an object falls inwards. E.g., if air is pumped out of the glass tube, the tube will rupture.

Implosion is an advanced technique for demolishing high-rise buildings. 

Demolition is done with this technique where the conditions on the site are not suitable for other methods of demolition. 

This method is adopted when there are many buildings around. In this way the demolition of the building is done on its foot print. 

The basic idea of ​​implosion technology is quite simple, in which if the support of the building is removed from a certain point in front, the upper part of the billing falls on the lower part. 

If the upper part is too heavy so, it collides with the lower part with sufficient force and causes great damage to the lower part. 

In this method the explosives are arranged in such a way that the whole structure falls inwards towards its centre of gravity (c.g.). 

Noida Twin Tower Demolition Video

Recently, one historical demolition happen in India that is demolition of Noida twin tower. See the full video and other information related to Noida Twin Tower Demolition.

Advantages of Implosion Technique:

Methodology used in implosion technique:

The various steps of demolition in implosion technology are as follows:

1. Drilling of holes for placing explosives:

Holes of 25 mm to 30 mm diameter in columns, piers etc. are drilled at a distance of 200 to 300 mm centre to centre. 

The hall is properly filled with explosive material. 

2. Quantity of explosive:

The amount of explosive to be filled in the drill hole depends on the following:

In this way, especially the columns inside the building are completely destroyed, but the columns on the outside are not weakened so that the building collapses on the inside.

3. Type of explosives and detonators:

Two types of explosives are commonly used:

4. Test blast:

Test blast is done before actually blasting to determine the efficiency of explosives and detonators. 

5. Wrapping of holes:

In this method, after filling the blast holes with explosive, the surface of the column is covered with gun bag, metal net or other suitable material. So that the debris does not fly into the air during the blasting.

6. Ballasting:

The process of ballasting of explosives should be done in a controlled manner so that there is a period of 1/100 seconds between two successive blasts. 

7. Falling of structure:

The building collapses on its footprint so as not to damage the surrounding buildings or property.

What is Pile Hacking?

Pile hacking is new technique of demolition which is generally used for demolition of vertical structural member like columns of building, piles, piers, etc.

If we say, so it is a one special type of hydraulic jack method of demolition.

In pile hacking a mechanical equipment used such as the hydraulic breaker, excavator and air compressor etc.

Mechanical equipment used to break the bond between the concrete and the steel reinforcement bars.

The concrete is then chopped into small debris for removal.

Pile hacking is fastest method for demolition of vertical structural member such as columns, piles, piers.

Safety Measures During Demolition:

Disconnection of utilities:.

General Safety:

Walkways and Sidewalks:

Catch Platforms:

When breaking down the exterior walls of high-rise buildings, build a ‘catch platform’ of strong planks so as not to injure the lower level labourers or the general public on the ground. 

Such catch platforms should not be more than 3 storeys below the floor wall which is breaking. 

The width of such catch platform should not be less than 1.5 m.  It should have a high parapet wall on the outside. 

Protective Screens:

Prepare a bamboo scaffolding on the road side of the building to be demolished and put protective screen along with it so that no one is injured by blowing bricks, concrete, pieces of wood etc. during demolition. 

Green Net can be used for such screens. 

Temporary Supports:

Temporary support is required to withstand the load of machinery used during demolition, broken debris, large pieces of concrete falling from above. 

Such temporary supports should be made of structural steel or heavy wood. 

Surrounding buildings, public utilities, retaining walls etc. also need temporary support.

If there is a possibility of damage to the foundation of a nearby building, use methods like shoring, under pinning to support the foundation of such a building. 

Dust and Noise:

2 thoughts on “9 Method of Demolition and Process for Building structures”

acetylene gas is converted to oxygen? CH3 ->??-> O2

Excellent article covering many issues in demolition. You may incorporate the issues raised in the following article for a full and complete assessment of health and safety issues when premature demolition of a housing complex surrounded also by young housing complexes: Ramaswami Ashok Kumar. 2022.PERFECT DESIGNS: The dangerous urgent issues regarding premature demolition of some buildings within a settled community.

Leave a Comment Cancel reply

Save my name, email, and website in this browser for the next time I comment.

Join TheConstructor to ask questions, answer questions, write articles, and connect with other people. When you join you get additional benefits.

Confirm Password *

First Name *

Last Name *

Country Select a country… Åland Islands Afghanistan Albania Algeria Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belau Belgium Belize Benin Bermuda Bhutan Bolivia Bonaire, Saint Eustatius and Saba Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory British Virgin Islands Brunei Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo (Brazzaville) Congo (Kinshasa) Cook Islands Costa Rica Croatia Cuba CuraÇao Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Honduras Hong Kong Hungary Iceland India Indonesia Iran Iraq Isle of Man Israel Italy Ivory Coast Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Kuwait Kyrgyzstan Laos Latvia Lebanon Lesotho Liberia Libya Liechtenstein Lithuania Luxembourg Macao S.A.R., China Macedonia Madagascar Malawi Malaysia Maldives Mali Malta Marshall Islands Martinique Mauritania Mauritius Mayotte Mexico Micronesia Moldova Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands Netherlands Antilles New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island North Korea Norway Oman Pakistan Palestinian Territory Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Qatar Republic of Ireland Reunion Romania Russia Rwanda São Tomé and Príncipe Saint Barthélemy Saint Helena Saint Kitts and Nevis Saint Lucia Saint Martin (Dutch part) Saint Martin (French part) Saint Pierre and Miquelon Saint Vincent and the Grenadines San Marino Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia/Sandwich Islands South Korea South Sudan Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Swaziland Sweden Switzerland Syria Taiwan Tajikistan Tanzania Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom (UK) United States (US) Uruguay Uzbekistan Vanuatu Vatican Venezuela Vietnam Wallis and Futuna Western Sahara Western Samoa Yemen Zambia Zimbabwe

By registering, you agree to the Terms of Service and Privacy Policy . *

Log in to TheConstructor to ask questions, answer people’s questions, write articles & connect with other people. When you join you get additional benefits.

Join for free or log in to continue reading...

Username or email *

Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Sorry, you do not have permission to ask a question, You must log in to ask a question. Join now!

The Constructor Logo

The Constructor

Demolition methods and process for building structures.

Do you need to remove the ads? Join now!

🕑 Reading time: 1 minute

Surveying of Buildings for Demolition

Removal of hazardous materials, preparation of demolition plan for structures, safety measures during demolition of building structures, 1. non-explosive demolition method, explosive demolition method for building structures, implosion method of building demolition, building demolition process.

1. Building Surveying

2. Structural Surveying

Demolition Methods for Buildings and other Structures

a) Sledge hammer

Non-Explosive Demolition Methods for Building Structures

b) Excavators and Bulldozers

Demolition of Buildings using Excavators

c) Wrecking Balls

Demolition of Buildings using Wrecking Balls

d) High Reach Excavators

Demolition of Buildings using High Reach Excavators

a) Falling like a tree

B) falling into its own footprint.

Implosion Method of Building Demolition

Fasi Ur Rahman

Related posts.

Roof Vents: What You Need To Know

Roof Vents: What You Need To Know

Cement vs. Concrete: Which Building Material is Better?

Cement vs. Concrete: Which Building Material is Better?

proposed method of demolition

Demolition Blog

3 key types of demolition methods.

There is much more to commercial demolition than preparing and knocking structures down. Depending on the scope of your project, there are several different methods of demolition which can be implemented for best results. From the projects that require a more delicate touch to those that require explosive power, there is a demolition method out…

commercial demolition

There is much more to commercial demolition than preparing and knocking structures down. Depending on the scope of your project, there are several different methods of demolition which can be implemented for best results. From the projects that require a more delicate touch to those that require explosive power, there is a demolition method out there that is best suited for your project. Make sure to follow the correct steps before beginning your demolition. Below, we will examine three of the most common commercial demolition methods, their best suited applications, and how you can get started on your next demo project.

Commercial Demolition By Explosion or Implosion

To begin, we will tackle the most efficient method of demolition, the use of explosives. Because of their ability to bring down multi-story structures quickly and under control, this method of commercial demolition is well known for saving both time and money. However, explosive demolition offers a few other key benefits as well.

With projects involving significant hazards, such as dangerous conditions, tight quarters, or threats to the health of the surrounding communities, implosions can be the best option for ensuring the safety and health of everyone and everything involved in the demolition process.

Before starting this method of demolition, make sure you are working with a commercial demolition contractor who has both experience and expertise, and that you have all the necessary legal permissions and documents. The last thing you want is to recreate the problems with the smokestack demolition project conducted in early 2020. Most structures, excluding brick and timber ones, can be adapted to this method of demolition.

However, if you need to salvage any of the materials or only want to demolish certain parts of your structure, there may be other demolition methods that better align with your project scope.

See below some of the primary types of demolition methods…

Commercial Demolition By Hand

While definitely the slowest option for demolition that exists, demolition through the use of hand tools can be a fantastic option when you need to be careful. The main goal of by hand demolition is to ensure the majority of the building parts can be recovered for future use. For example, if you need to save LAN cables, electrical wiring, or other important building components, this demolition method will be your best bet.

It should be noted that this method of demolition is accomplished most safely when done floor by floor, starting with the roof and working down. We also usually recommend that the businesses using the building either temporarily shut down operations, or find temporary office space. While this method of demolition certainly offers unique benefits, it is also the slowest option and can be very costly. What demolition options are available to those who are searching for a more rapid and cost-effective way to tackle their project?

Commercial Demolition By Machine

Mechanical demolition is by and large the most common demolition method available for many commercial projects. Through the use of heavy machines and the latest technology, commercial demolition projects can be handled quickly, efficiently, and cost effectively.

Much of this equipment requires a great deal of skill and experienced professionals should be the only ones to operate said equipment. These are not tools to try to learn in a weekend. For example, hydraulic excavators, cranes, and even wrecking balls are all common demolition machines that demolish entire buildings over short periods of time and cause many potential hazards if used inappropriately.

While uncontrolled or unintentional building collapses are a worst-case scenario, other factors such as excessive dust, flying debris, and noise can all cause serious damage to surrounding structures or workers. Be sure to have all the proper documents and a professional debris removal service in place before beginning your demolition project, and many of these hazards will not be a problem.

Additional considerations for any type of commercial demolition project include:

If your demolition project requires you to stay under budget and on a tight schedule, mechanical demolition will likely be the best course of action to take.

Handling Commercial Demolition with Alpine Demolition Services

At Alpine Demolition Services , we understand how important it is to finish your demolition projects on budget and on time. That’s why we will work with you and your team to accomplish this goal by choosing the best method for your specific project. When you work with Alpine Demolition you can be assured that you are working with a commercial demolition expert who dedicates the resources and has the understanding to complete the job in a safe, efficient, and sustainable way.

If you would like to discuss your next project with our team, please do not hesitate to call us at (630) 761-0700 or contact us online . No matter your project or method, we look forward to helping you knock it down.

Post navigation

Related news, types of demolition explained: residential vs commercial.

Not all types of demolition are the same – and you’ll perhaps notice the biggest difference in demolition types between residential and commercial properties. To put it simply, they often encompass very different types of demolition, and while some of the differences are obvious, others are not. In this post, we’ll take a closer look…

Why Aren’t Abandoned Buildings Demolished?

The J.L. Hudson Department store built along Woodward Avenue in downtown Detroit was one of the most iconic buildings in any major American city. As the flagship building for the Hudson’s department store chain, it was constructed in various stages between 1911 and 1946 before it was closed and vacated in the late 1980s. It…

From our Clients

Spoke with Marie Portis, District 1, who wanted to pass on they were very pleased with the performance of your staff. They raved about the professionalism and quality of service received. Patrick Kelleher - IDOT
It was nice working with Alpine again. Your crew did awesome. The University was very happy. Dave Haas - Pepper Construction
“Your crew did a great job! Thanks to you and all your people for helping us get that old house on its way.” Kevin Morrissey
“Your performance and quick responses to work request is exceptional! I will not forget it, and will recommend you to my many PM friends around Chicagoland.” Ron C. Tamason, P.E. - The Missner Group
"I just wanted to send you a quick note and say thank you. The guys did a great job. I was very pleased with the way everything worked out." Richard Porter - Porter & Company, Masonry
"I just wanted to commend you for the very safe and talented group of employees you have onsite here at Midway. Your crews are top-notch." Neil Barkowski - F.H. Paschen, Civil
"Great work today with picking the beams! We got a lot of positive comments about the professionalism, and how clean the job site is." C Lawler - F.H. Paschen


proposed method of demolition

Work with us.

Interested in our services? Fill out our contact form or call 630.761.0700.

Stay connected with Alpine.

A Short Guide to Building Demolition

Know more about building demolition, its methods, processes, and discover how site supervisors establish safety during demolition.

building demolition

Updated 30 Nov 2022 , Published 1 Apr 2022

What is Building Demolition?

Building demolition is the process of dismantling, destroying, or knocking down building structures along with the materials used in the construction of the property. A building is demolished for various reasons such as: it’s past its span of serviceability, the structural integrity is compromised, parts of the establishment will need to be refurbished to improve its quality and value, or the property owner intends to sell a vacant lot.

If a building is not demolished when it needs to be, it can pose a significant threat and endanger not just the people occupying the property, but others in the vicinity as well. According to the Occupational Safety and Health Administration (OSHA), proper planning is crucial to ensuring that building demolitions are conducted without injuries and accidents.

There are many things to consider when planning to demolish a building—such as the structure, location, materials used, strength of the building, and threats that it may pose if wrongfully executed. Finding the best method before proceeding with the plan is the most important element in ensuring a safe demolition process.

Demolition methods are divided into two categories and further classified into demolition types. They are as follows:

Non-explosive method

Non-explosive method is a demolition technique that uses hand tools and machinery . It is best used to dismantle smaller- to medium-sized structures like homes or other establishments. This method includes the use of:

Implosive method

Implosive method is a type of demolition technique that uses explosives to destroy the structural supports of the building and make it collapse. It is best used to dismantle a building or structure with significant height. The two ways to do this are:

Building demolition should be done according to a set process and following the steps below can help ensure that the procedure is done safely and systematically:

Building Demolition Process

1. Survey the building

Industry professionals should check all of the elements of the property such as the construction materials, design, usage of building prior to demolition, and building codes. There should also be a review of the preference of the nearby neighborhood to noise and dust, as well as other possible impacts of these kinds of activities to the community.

Additionally, the building should be checked for the presence of hazardous, toxic, radioactive, or flammable materials. Structurally, the building should be inspected for the method of construction, current structural condition, and structural system and design.

This way, it would be easier to determine which methods to use in demolishing the property, safely and efficiently.

2. Remove hazardous materials

If hazardous materials such as asbestos minerals, radioactive substances, and flammable materials are found in the initial inspection, industry experts should be deployed to remove them safely before proceeding to the demolition.

3. Prepare the demolition plan

A detailed plan on how the demolition is best executed should be developed. The demolition plan should contain specifics on which demolition methods to use in each part of the building along with the sequence of how it should be carried out.

Supporting details such as the location of the building and its distance from other structures and roads, as well as from vulnerable zones such as schools and hospitals, should be indicated.

The demolition plan should also mention all the measures on how to manage health, safety, and waste disposal before, during, and after the demolition.

4. Implement safety measures

All involved personnel should discuss preventive measures and engage in toolbox talks to ensure a safe, efficient, and unified approach to the demolition procedure.

Additionally, proper and consistent usage of demolition safety signs should be observed. Workers should also wear the appropriate Personal Protective Equipment (PPE) at all times when in the vicinity of the structure.

Failure to comply with the above-mentioned reminders and other essential safety measures can lead to various consequences including exposure to hazardous chemicals, occurrence of flash fire, or development of occupational disease.

Aside from choosing the right demolition method and following the demolition process, supervisors, site managers, and other personnel should also take note of the following control measures to ensure a safe building demolition:

Conduct an asbestos inspection

Asbestos inspection is vital in eliminating employee exposure to asbestos minerals and should be done before altering any parts of the structure. This inspection should specifically be conducted by a certified asbestos inspector to ensure that it’s done safely and according to the set standards.

Manage waste disposal

Managing waste disposal is required by law to protect the health and safety of the public and the environment. As the demolition and construction industry is one of the contributors to solid wastes, proper waste management is essential in making sure that all wastes and construction debris—especially those that are hazardous—are disposed of properly.

Incorporate risk assessment

A detailed and comprehensive planning stage of the demolition process enables all site supervisors and other involved personnel to be one step ahead. In an industry prone to hazards, performing risk assessments is fundamental in identifying possible project setbacks and in addressing them proactively. Assessments help ensure that those identified risks are managed accordingly and significantly reduce the chance of untoward incidents.

Demolition supervisors can also integrate the concept of the hierarchy of controls in eliminating hazards and risks, and in ensuring a safe working environment for their team.

Create Your Own Risk Assessment Template

Eliminate manual tasks and streamline your operations.

Communicate with your team

People on-site directly witness day-to-day operations so they would know best what precautions should be taken and which issues should be prioritized. Encourage a steady stream of communication within the team to promote transparency and eliminate incidents caused by a lack of proper communication.

Implement OSHA guidelines

The demolition industry can further safeguard their operations by adhering to the detailed demolition standards provided by OSHA. This set of standards includes resources for primary demolition standards, as well as references from the relevant construction industry.

Perform regular inspections

Ensure that all standards, procedures, and regulations are followed and consistently practiced by performing regular inspections. This helps maintain employee compliance across-the-board and enables teams to address any issues identified before they negatively impact the project.

Building demolitions should be done according to a set process and standard. It should also be streamlined from start to end to reduce the likelihood of demolition-related accidents.

SafetyCulture is a digital safety platform that offers high-level visibility. Ensure safety in all parts of the demolition process with SafetyCulture. Move away from pen-and-paper inspections to efficiently perform essential audits and eliminate inaccuracy. Further safeguard building demolition using SafetyCulture to do the following:

Try SafetyCulture for free!

Demolition Daily Site Inspection Checklist

Demolition supervisors can utilize this template to monitor and observe safety in daily operations. Use this building demolition checklist in SafetyCulture to do the following:

proposed method of demolition

SafetyCulture Content Specialist

Jaydee Reyes

Jaydee Reyes is a content writer and researcher for SafetyCulture. Her six-year experience in the field of data research and media monitoring adds expertise and quality to her work. She is also a champion of leveraging technology to promote a culture of safety in workplaces around the world. As a content specialist, she aims to help companies adapt to digital changes through interesting and informational articles.

In this article

Relevant articles, green building.

Benefits Green building practices present a great alternative to traditional construction systems ...

First Aid in the Workplace

Why is it Important? Workplace first aid is an essential part of an organization’s health and ...

Buddy System at Work

What is a Workplace Buddy System? Interestingly, the concept of the “buddy system” came ...

construction team discuss green building design plan

Related pages

We use cookies to provide necessary website functionality and improve your experience. To find out more, read our updated Privacy Policy .

Amit Shah to dedicate various development works to Ahmedabad

Nhai fined rs 2 cr fine for flouting dust control measures.

RateGain’s founder buys bungalow in Delhi

Noida and Gurugram witnessed record housing price appreciation in 2023

Understanding & Importance of Wastewater Management in India

Wastewater Reclamation and Reuse

A Review on Water Treatment Technologies

Water Management System – Potential and Challenges


International conference on “Asian Scenario on Infrastructural Development”

2 Day Special Programme on Innovative technologies for concrete repairs and protection

India Manufacturers & SME Summit

Different types of demolition methods for building & structures

demolition methods for building

A building is designed considering a span of life. When this design life of the building is over, the structure is not safe for living for one’s self as well as for neighbouring buildings. So demolition becomes pivotal. It is a method used for safe and careful removal of existing buildings and structures in order to utilise the land for some other purpose. There can be many reasons for the demolition of a building such as loss of structural stability, structural damage, illegal construction or plans to restructure. If you have a massive building surrounded by other buildings you need to find means to properly demolish the building, therefore demolition method selection is pivotal.

In 2020, two of the four apartment complexes in Maradu in Kerala’s Kochi were demolished in a controlled implosion after the Supreme Court’s order for violating the Coastal Zone Regulation (CZR) norms. Described as the first such implosion demolition in the country of this dimension, two luxury waterfront high-rises in the Maradu district of Kochi city were razed to dust. The first block of  flats was demolished and a minute later the second block followed it to the ground.It is one of the largest demolition projects undertaken in India involving residential buildings. Mumbai-based Edifices Engineering carried out the explosion with the assistance of experts from South Africa-based Jet Demolition.

proposed method of demolition

The above cited example is just one of the many demolition projects undertaken across India and the globe. The reasons could be a structural failure, age of the building, illegal construction and need for restructuring. Given below are 5 examples of demolition of structures undertaken due to these reasons.

In focus – 5 demolition projects across India and the globe

India – Aravalli, Gurugram, 2020 – Seventeen farm houses constructed illegally in the Aravalli region in Gurgaon were demolished by a joint team of the Municipal Corporation of Gurugram (MCG) and Department of Town and Country Planning (DTCP). The reasons cited were illegal occupancy and a complete lack of any concern for the environmental and ecological degradation. These farmhouses had been constructed illegally on around 50 acres of land, without applying for any permission. The demolition was carried out near Bandhwari village.

proposed method of demolition

UAE – Abu Dhabi, 2020 – Abu Dhabi’s iconic Mina Plaza, which consisted of four towers with 165-meter height was demolished in just 10 seconds last year. The 144 floors of the plaza were successfully demolished in a record 10 seconds on November 27. It has set a new Guinness World Record of ‘tallest building demolished using controlled demolition. The demolition involved the use of 6000 kg plastic explosives and a detonator cord. The abandoned unfinished tower blocks, located in the Mina Zayed area, were demolished to pave the way for an all-new wharf in the iconic port-side community. Modon Properties was appointed by the DMT to carry out the demolition of Meena Plaza Towers.


Italy – Genoa, 2019 – Demolition experts blew up what remained of the Morandi bridge in the Italian city of Genoa nearly a year after the structure collapsed. Thousands of people were evacuated ahead of explosions to bring down two large towers consisting of about 4,500 tonnes of concrete and steel. To prevent the spread of dust, the bridge was lined with 50 large water tanks to minimise potential air pollutants. The demolition was done as forty-three people were killed when part of the bridge, and cars traveling along with it, fell 45m (148ft). The reason for the collapse was not officially determined but the purported hypothesis includes wet conditions, landslides, structural weakness and corrosion.

proposed method of demolition

United States, Texas 2019 – Ocean Tower was built in South Padre Island, Texas. The highrise was still under construction when it was revealed that it was shifting and leaning to one side. This structural failure led to the decision to demolish the condominium building. The implosion was done by stripping the tonnes of material of the building. The plan implemented was to attack the three massive cores of the building with implosion. Built to stand up to a hurricane, these solid monoliths were so dense that they were immune to the wrecking machines. The designers found a way to reduce the giant tower’s height by more than 30 metres so it could fit into the drop zone. The project was executed by the Control Demolition Incorporated company.

proposed method of demolition

India-Moulivakkam, Chennai 2016: An 11-storey building in Moulivakkam was demolished in 2016. The second block of the building was declared unsafe after an adjacent block collapsed. The building demolition was done by using implosion technique. Columns in the 11-storeyed structure were filled with explosive substances and brought down employing controlled blasting of explosives. Timer devices were used and the multiple blasts were carried out sequentially by using a remote.

The reason cited for demolition was that the building was grossly under-designed for a 11-storey building. The demolition was undertaken by Tirupur-based Maglink Infra Project Limited.

proposed method of demolition

In all of the above cases, the demolition methods were selected based on structure detail, soil property investigation and surrounding inhabitant present. For carrying out demolition you need to keep account of surveying, removal of hazardous materials, preparation of plan and safety measures. A successful demolition occurs if all these are appropriately addressed. Discussed underneath are different types of demolition methods that can be adopted.

proposed method of demolition

As the name suggests this involves the demolition of an entire structure. This is mostly applied to the re-structure of a building. There are different methods to carry this type of demolition each of them is given below.

Implosion demolition – It is a form of demolition in which objects are destroyed by collapsing on themselves. This method employs the use of explosives to bring down high structures by undermining structural supports so that it collapses within their footprint or along a predetermined path. Depending on how the structure falls, there are two types of implosion: a) Falling like a tree and Falling into its footprint. In this method instead of an explosion outwards, the force of the explosion is directed at critical support points, which are suddenly weakened making the weight of the building unstable. It collapses in a controlled manner.

Chemical demolition – This method involves the use of concrete demolition powder, concrete breaking chemical, and concrete cracking chemical you can quickly and safely bring down large structures. This advanced concrete cracking agent has expansive power that demolishes even massive buildings with minimum effort and time. The concrete breaking powder is non-explosive and soundless. Chemical demolition without the use of explosives works safely and can be more cost-effective. There is no lengthy permitting process required, as opposed to blasting. The remainder of the structure is safe from vibration, and certain areas of valuable stone can be preserved.

Controlled demolition – It is a  demolition method that involves taking down buildings and structures in a safe, guided manner in order to achieve the best timely results. Most structures can’t be taken down in a day, so when things are in the process of being demolished, a building must be taken down in sections to ensure that the remains are as stable as possible. Controlled demolition can be used for tall buildings, bridges, chimney stacks and cooling towers This type of demolition is done by diamond drilling and hydraulic concrete crunching.

Mechanical demolition – this method involves the use of specialized mechanical equipment and tools. These equipment include hydraulic excavators equipped with specialized attachments that can break concrete and steel to demolish the structure apart. The building with a greater height up to (6-7 story) cannot be demolished with the help of excavators or bulldozers. In such cases, cranes with wrecking balls are used to perform the demolition activity. The wrecking ball crack is attached with a huge steel ball hanging from a steel rope. The steel ball is pulled and released towards the building. High-reach arm machines can be used for projects of 20 meters. The arm is telescopic and has demolition tools attached at the end; shear, hammer or crushers. This type of demolition is more precise than the crane and ball because specific demolition tools can be used on different building materials like steel or concrete.

This type of demolition includes removing specific parts of a building. Some old buildings stand the test of time and others don’t. This method involves the removal of specific interior portions while protecting the remaining structure and exterior portions of a building protecting nearby structures and areas. For interior demolition, sledge hammers are used and for exterior demolition excavators, bulldozers or skid steers loaders are used.

This type of demolition involves the removal of specific interior buildings The method will vary based on whether you want to remove one or multiple sections from the buildings.  This usually includes removal of walls, ceilings, pipes, etc.

This method involves the careful dismantlement or deconstruction of a building or structure to preserve parts for reuse, refurbishment or recycling. In this type, careful dismantlement or deconstruction of a structure is done to preserve components for reuse.

The selection of the right demolition method is important and it needs to be done safely and correctly so the surrounding neighbouring building or structure does not get affected. Select a demolition expert who has the skill and experience of undertaking structure detail, soil property investigation, and safety of the surrounding buildings and public areas before execution of the project. These are a few methods, other than these innovations that are happening across the world with varied other kinds of demolition methods, which will be discussed in an upcoming article.

Supertech twin tower demolition with controlled implosion

India is set to witness the biggest demolition of building.

proposed method of demolition

Most Popular

Retaining wall design and its types used on construction, different types of pile foundation and their use in construction, different types of loads in buildings and structures, fiber-reinforced concrete – advantages, types and applications, indore development body to put 1,820 flats for sale, trichy corporation has sealed shops to collect rent dues, in 2022 alone, chennai lost 955 trees for infrastructure projects, cbi arrests pearls group’s director in rs 60,000 crore scam, editor picks, the bridge foundation advantages and types, wheel loader models and their functions, popular posts, commercial architecture – designing commercial buildings in 2023, popular category.

Constrofacilitator is knowledge and b2b portal for the building and construction industry. We facilitate expertise for building and civil engineering. Our services include digital promotions, content development and sharing, brand building, infographic and product feature, website development and maintenance, social media management, conference management and more. Whatever is your need we are here to cover it for you - Designing to digital we can cover it.

© Constrofacilitator

Join our “IN-BRIEF” to stay up to date on our upcoming Articles, News, Events & Tenders


Demolition Methods 101: A Thompsons of Prudhoe Guide

proposed method of demolition

Here at Thompsons Of Prudhoe, we are specialists in the four D’s. Demolition , Deconstruction, Dismantling and Decommissioning .

Having been honoured with the title of “Demolition Specialist Of The Year 2014” at the prestigious National Construction News’ Specialists Awards, we are confident that we can tackle all types of demolition projects and no project is too big nor too small for our team to tackle. We have undertaken developments for the likes of Nuclear Licensed Sites, Pharmaceutical Plants, Oil and Gas Refineries, Chemical Plants and many more.

But for many, when they enlist the help of our services, it can be overwhelming to understand the in’s and out’s of the demolition process, and that there are many different methods of demolition that can be performed. We want to change that today with our Thompsons guide to demolition…

What Is Demolition?

Demolition is simply the safe and careful removal of existing buildings and structures in order to utilise the land for another use.  It can be either completely demolishing a structure or dismantling part of a structure that is load-bearing in order to reuse or recycle components.

Demolition Methods and Common Types

Total demolition.

The demolition of an entire structure or site. This would be most common in the case of community re-structure; for example, if there was an old retail centre that was not benefiting an area, the land could be used to build a housing estate, to provide additional housing for the community, and therefore demolition would be instructed.

Selective Demolition

Removing specific parts of a building. Some old buildings stand the test of time and others don’t. In this case, perhaps there is a really old section of a workplace or local amenity that is not performing as it should, but the entire building is not at a state of concern. Or perhaps it is a listed building, therefore you may be restricted as to what and how much you can demolish. So you could select a particular section of the building to demolish and build up from scratch. This also can add value to a current building too by performing construction in stages.

Interior Demolition

Demolition particular parts of the inside of a building, while protecting and maintaining the exterior structure. For example; partitions, walls, ceilings, etc. A great option for creating more space inside of a building or removing troubled areas.

Dismantling or Deconstruction

This method involves the careful dismantlement or deconstruction of a building or structure in order to preserve parts for reuse, refurbishment or recycling. Dismantling structures is a lot more labour intensive than say total or explosive demolition.

Explosive Demolition

A highly specialised type of demolition, explosive demolition involves using explosives to bring down high reach building structures. This type of demolition work will target the structural support of a building so that it collapses in on itself.

proposed method of demolition

Why Is Demolition important?

Building demolition needs to be done correctly, in a safe and correct manner is vital in order to base solid foundations for the next construction process. There are regulations to follow, Health and Safety laws to abide by, and a level of skill and knowledge involved – it’s not just as simple as bulldozing down a building.

Before a demolition process begins, there are a number of factors to take into consideration. The following are:

Why Should I Choose Thompsons Of Prudhoe For My Demolition Project?

As we mentioned earlier, we are specialists in the four D’s. We know exactly what to look out for when demolishing a site.

We cannot express enough how important it is to instruct the aid of professionals like ourselves when it comes to demolishing a site. In addition to the factors listed above, there are also a number of additional things that our trained eye can work on and prevent any risks or damage. The following are:

Get In Touch Today …

If you require the use of our demolition services, then don’t hesitate to get in touch with our team today. Give us a call on +44(0)1661 832 422 or write to us at [email protected] .

We use cookies to ensure we give you the best experience on our website. You can find out about our cookies and how to disable cookies in our Privacy Policy . If you continue to use this website without disabling cookies, we will assume you are happy to receive them. Close .

proposed method of demolition

Designing Buildings - The Construction Wiki

Make a donation to support Designing Buildings


[ edit ] Introduction

Demolition is the most high risk activity in the construction sector .

The essence of safe demolition lies in efficient risk control, environmental management and careful planning . The CDM Regulations have provided a platform from which the industry should adopt best practice , demanding written plans of work for demolition even where a project is not notifiable.

Clients and their professional advisors play a vital role in safe demolition and must:

[ edit ] Pre- demolition information

The level and detail of pre- demolition information and surveys required should be proportionate to the project and might include:

[ edit ] Planning permissions

Demolition requires notification to be submitted to the local authority to determine whether prior approval is required for the method of demolition where buildings are over 50 cubic metres , and for walls or gates .

Planning permission is required for demolition of unlisted buildings in conservation areas and listed building consent is required for demolition of any part of a listed building .

Where demolition works may have an environmental impact , a screening opinion may be obtained from the local authority to determine whether a full Environmental Impact Assessment (EIA) is necessary.

[ edit ] Demolition procedures

General demolition procedures include:

[ edit ] Demolition methods

Demolition methods include:

[ edit ] Explosives

Explosives allow rapid and complete demolition where other methods may be dangerous or slow. This requires extensive use of the police to enforce exclusion zones as well as pre- and post- demolition structural inspections for a substantial radius (in the order of quarter or half a mile). For more information , see Explosives .

However, recent developments in high-reach machinery mean that buildings less than 22 storeys are generally demolished by machine.

[ edit ] Hand demolition

These methods may be used for small- scale projects , or when demolition has to be carried out in a more sensitive manner due to site constraints such as; proximity to uncapped mineshafts , overhead utilities , pedestrian access , adjacent structures , or structural instability.

It involves the progressive demolition of a structure by operatives using hand tools . In general, the order of demolition is the reverse that of construction .

[ edit ] Machine demolition

This is by far the most frequently-used method and reduces the need for people to work at height , or manual handling .

Common techniques include:

[ edit ] Other methods

Other methods that can be used include:

[ edit ] Materials disposal

Buildings handed over for demolition generally contain hazardous waste , rubbish for landfill and recyclable material . Best practice use of site waste management plans for all demolition projects assists in ensuring the optimum recycling chains are in place . Clients can assist by handing over empty buildings and finding new uses for furniture and equipment .

Demolition produces products suitable for construction with the general rule that a recycled material can be considered a grade lower than its original state. So crushed structural concrete for example may be used as blinding , though with full treatment and a designed mix, it may be possible to achieve structural grade concrete . At present, it should be practical for a competent contractor to achieve 95% building recycling by mass, or even more for some structures .

Materials should be provided to WRAP protocols with Environment Agency certification . It is practical to crush on site for volumes in excess of 3,000 cubic metres .

For more information , see Site waste management plan .

[ edit ] Policy

The Coalition Agreement outlined the government’s commitment to increase housing supply , tackle the problems that rundown vacant properties cause and help support local economic growth from refurbishment and improvements. In a written ministerial statement of 10 May 2013, Official Report, Column 13WS , ministers committed to revising outdated guidance issued by the former Office of the Deputy Prime Minister in relation to demolition .

On 16 January 2015, The Rt Hon Eric Pickles MP, Secretary of State for Communities and Local Government , confirmed that the following pieces of guidance no longer reflect government policy and so were cancelled:

(Ref. DCLG, Statement on the planning decision on Welsh Streets in Liverpool and the revocation of outdated guidance on demolition . 16 January 2015.)

[ edit ] Related articles on Designing Buildings

[ edit ] External references


Related articles

Designing with daylight

Featured articles and news

Help for construction clients

Support for clients 350.jpg

CIOB launches a range of free digital resources for clients.

Enjoying using Designing Buildings?

Donate paypal button v3.png

Make a donation to ensure construction knowledge stays freely accessible.

Time to write an article?

Typewriter-1248088 350.jpg

Share your knowledge and help improve the construction industry.

Unconscious bias


Distorted views on gender equality at the highest level.

The latest engineering services sector survey

Dark clouds 350.jpg

Payment and recruitment challenges loom in 2023.

A win for Construction Carbon

Construction carbon steps 350.jpg

At CBRE Tech London Advocates Net Zero Challenge.

10,000 years on the Isle of Man

Meayll Circle 350.jpg

From early Christians, Celts and Vikings to motorcyclists.

Britain's historic paving

Historic paving 350.jpg

Understanding the materials used and how to care for them.

England, Wales, electrical skills, training and net zero.

Electro switch cabinet 350 .jpg

improving standards, boosting recruitment and a Green Skills Action Plan.

Change EPC's to measure cost, consumption and carbon

Elmhurst DEA advising on EPC 350.jpg

Says the UK’s largest EPC accreditation scheme in report.

Launch of Green Alliance construction and efficiency report .

Green Alliance logo 350.jpg

CIAT contribute to research,for the Circular Economy Task Force.

ASBP awards 2023

ASBP awards 2023 350.jpg

Sustainable projects, products and initiatives recognised.

Types of heat exchanger

Old heat exchangers 350.jpg

Between any combinations of gases, liquid or solids.

See more news.

Designing Buildings Anywhere

Get the Firefox add-on to access 20,000 definitions direct from any website

Downwell Group Logo

Demolition and Enabling Solutions for the Construction Industry

Tel: 01708 932300

The Demolition Process – Demolition Contractors London

When it comes to the Demolition of a building or structure it is not as simple as just rocking up with excavators and demolishing there building. There is a process that leads up to the demolition and here is a useful guide which you may find useful.

proposed method of demolition

Before we start,  if you need a quotation for Demolition, Asbestos Removal or Scaffolding Tel: 01708 932 300

The demolition process for buildings and structures.

The requirement to demolish or refurbish a building occurs for a variety of reasons. It is essential that the demolition process is adhered to.

Every building has a lifespan which is known as its ‘design life. An architect will design a building with perhaps a life span of 80 -100 years. When it has reached the end of its life span, it might become dangerous for habitation or to the adjacent buildings around it.

Other reasons are that new ones replace old structures. The structure has lost its stability, or it may have structural damage. 

Demolition –  means destruction, breaking down or removal. The Demolition of a building is the process of dismantling a structure after its life span or serviceability by pre-planning and controlled demolition methods.

Implosion –  This type of Demolition is carried out by a few specialist companies in the UK

The four steps in the process are

a) Surveying

b) Removal of hazardous materials

c) Preparation of plan

d) Safety measures

Surveying means the study of different features of the building or structure and surroundings. The two types of surveying are

a) Building surveying

b) Structural surveying

1. Building Surveying

The surveying processes include

Structural Surveying

In a structural survey, following process are carried ou

The removal of  Hazardous Materials 

Hazardous materials which could include asbestos could come to light as the result of a demolition survey. Specialist asbestos removal and remediation companies should be employed to remove dangerous substances from the site before the Demolition.

Demolition Plans 

A demolition plan illustrates the different process involved, and they are:

Safety Measures during Demolition of Buildings 

All the workforce will have a site induction and toolbox talk to discuss methods and environment

Fire and emergency plans are prepared and included within the health and safety induction.

As a matter, of course, measures are put in place to reduce and monitor, Dust, noise and vibration. 

All the workforce wear full PPE. Occupational health checks are carried regularly for all demolition workers.

Demolition Methods 

There are two types of Demolition employed for buildings and structures

a) Non-explosive or controlled demolition

b) Explosive Demolition.

1. Non-Explosive 

The Demolition of the building using hand tools and machinery. It encompasses robotic Demolition using electric excavators operated from a distance.

The types of Demolition within this category are

Demolition using standard or high reach excavators

Top-Down Demolition



a) Soft strip

Usually after, or in conjunction with asbestos removal the building has floor coverings, suspended ceilings, partitions, doors, air conditioning, heating and lifts removed before the building demolition.

Work is predominantly using hand tools, and the materials are removed from the building using waste chutes, lifts or walked out manually to waste bins.

b) Standard and High Reach Demolition

Standard and High Reach Excavators are the conventional method of Demolition used of buildings. The height of the building dictates which type of machine is selected. Semi/High reach machines are used generally for buildings over three storeys. Once Demolition reaches the lower levels, the standard excavators will take over.

All excavators have an array of low noise generating attachments including

c) Top Town Demolition

A method commonly used on Tower Blocks where the space around the building is listed. The building is scaffolded on all sides and covered in monarflex, which helps reduce Dust. The building will be checked structurally before this method 

Small excavators and skids steers (Bob Cats) are lifted onto the roof by cranes. Openings made in the roof allow the construction of ramps. These allow excavators to go down onto the floor below. The excavators will then remove the roof working from below and above under controlled conditions.

The same process follows on for each floor and with waste materials removed using waste chutes, lift shafts or materials craned away in skips.

See our project at Carlton House .

d) Deconstruction

Deconstruction is the prefered method on Panel System Buildings. In the 1950s and 60’s many Council, Tower blocks constructed using large concrete panels lifted into place by cranes.

In the early sixties,  Ronan Point  collapsed due to a gas explosion which resulted in the buildings undergoing modifications to strengthen.

Deconstruction takes place using a crane. The panels are removed from the building in the reverse order of construction. However, the building has to undergo propping to avoid its collapse while the work is taking place.

As with top-down Demolition, scaffolding encapsulates the building and machinery lifted onto the roof.

Where space allows the Demolition can take place using high reach machines.

See our Allen Court project

d) Dismantling

This process to remove old machinery and equipment before the primary Demolition takes place. Machinery is dismantled or cut into pieces.

2. Explosive Demolition 

Implosion method.

Implosion is the Demolition of a building by explosives. With the removal of the foundations, the structure will collapse. This method is used mainly for large factories and power stations. Most Demolition in Towns and Cities is carried out by conventional means.

This method involves the main supports of a building, including column’s, beams and slab fixed with explosives. Once the explosives detonate, the building will collapse.

Depending on how the structure falls, there are two types of implosion:

a) Falling like a tree

The implosion makes the building fall like a tree sideways and is the most common method of implosion. Where the building has sufficient area around it available besides the building, this type of Demolition is preferred.

If there is free space available on the left side of the building the explosives are placed on the lower level of the building on the left-hand-side columns. As the explosives detonate, the columns bursts and the building will fall towards the left-hand side. Cables are tied to the building and control the direction of the fall.

b) Falling into its footprint

When there is limited space around the building, this type of Demolition selected. Explosives are placed into the floor below the middle part of the building.

These explosives are substantial as the explosion must demolish the building at once. It is a series of blasts, one followed by another. Then the building falls towards the first blasted part.

When the charges detonate, the upper part of building implodes and falls onto the lower building. The heavy load and force the lower part of the building also collapses and falls on its footprint.

Return to Home page link

Demolition Insights – Link

100 years of demolition experience

Please select the division you wish to connect with:

Enquiries Demolition Environmental Engineering Construction Careers

volumetric repair

Issue 5-1 Jan/Feb 2023

Issue 4-6 Nov/Dec 2022

Issue 4-6 Nov/Dec 2022

Issue 4-5 - Sep/Oct 2022

Issue 4-5 - Sep/Oct 2022

Issue 4-4 - Jul/Aug 2022

Issue 4-4 - Jul/Aug 2022

Issue 4-3 - May/Jun 2022

Issue 4-3 - May/Jun 2022

Issue 4-2 - Mar/Apr 2022

Issue 4-2 - Mar/Apr 2022

Issue 4-1 - Jan/Feb 2022

Issue 4-1 - Jan/Feb 2022

Issue 3-6 - Nov/Dec 2021

Issue 3-6 - Nov/Dec 2021

Issue 3-5  - Sep/Oct 2021

Issue 3-5 - Sep/Oct 2021

Issue 3-4  - Jul/Aug 2021

Issue 3-4 - Jul/Aug 2021

Issue 3-3 - May/Jun 2021

Issue 3-3 - May/Jun 2021

Issue 3-2 - Mar/Apr 2021

Issue 3-2 - Mar/Apr 2021

EC - Volume 3 Issue 1

Issue 3-1 - Jan/Feb 2021

EC - Volume 2 Issue 6

Issue 2-6 - Nov/Dec 2020

EC - Volume 2 Issue 5

Issue 2-5 - Sep/Oct 2020

force majeure

Issue 2-4 - Jul/Aug 2020

different types of cranes machines

Issue 2-3 - May/Jun 2020

equipment fleets

Issue 2-2 - Mar/Apr 2020

plastic contractin

Issue 2-1 - Jan/Feb 2020

heavy load truck

Issue 1-6 - Nov/Dec 2019

highway construction materials

Issue 1-5 - Sep/Oct 2019

heavy equipment machinery names

Issue 1-4 - Jul/Aug 2019

heavy equipment damage

Issue 1-3 - May/Jun 2019

sell my heavy equipment

Issue 1-2 - Mar/Apr 2019

concrete demolition attachments

Issue 1-1 - Jan/Feb 2019

Complete Guide to Construction Demolition

Types of demolition, preparation, the future, and more.

proposed method of demolition

View the complete article here

Watching a multi-story building in the middle of a city get demolished is quite dramatic. Many people enjoy watching all that concrete and steel tumble to the ground. But few know how it’s actually accomplished – other than the fact that explosives are involved in some way. In our Complete Guide to Demolition we explain the different ways to knock down a structure.

Why Are Buildings Demolished?

There are several reasons why a building is demolished. Structures may be dismantled because they have weak foundations, or they were constructed with hazardous materials. Sometimes the land is more valuable than the structure. Or a new structure is more useful to the surrounding community. Owners of very old buildings may determine that it’s cheaper to knock it down than repair it.

Types of Demolition

There are several ways to bring down a structure including implosion, high reach arm, wrecking ball, and selective demolition.

With implosion demolition, explosives are used to force the building to collapse down on itself from the inside out. This type of demolition is typically done in densely populated urban areas. Detailed structural blueprints are used to help the blaster crew identify where the main components of the structure are located.

High Reach Arm

This type of demolition requires a machine, such as an excavator, with an attached demolition arm or telescopic boom that is long enough to reach the top of taller structures. Various attachments may be used to break up the building. This could be a hammer, shears, or a crusher. The building is broken up from the top down. The machine is used to remove the largest pieces of the building. The demolition ground crew then breaks them up further. Finally, the crew sorts through the debris for disposal.

proposed method of demolition

Wrecking Ball

The term “wrecking ball” – as in such-and-such building escaped the wrecking ball – is used more than the actual wrecking ball method of demolition. It was very popular through the 1930s to 1960s. The ball – which can weigh upwards of nearly seven tons – is typically suspended from a crane by a cable. The operator either drops the ball on top of the structure or takes a swing at it. The building is crushed under the ball’s heavy weight. Unfortunately, wrecking balls cause a lot of dust. This is not the first choice when demolishing buildings that contain asbestos. It’s use is limited by the size of the crane. It requires swinging room that is not often available near power lines and other structures.

Selective Demolition

Selective demolition, or strip-out, is a labor-intensive method. The goal is to reuse or recycle as much material as possible. This makes sense when there is enough valuable material to save. An historical building is a good candidate for selective demolition. Or when a building needs an intensive overhaul, but not a complete demolition. Selective demolition is a good alternative for expansion work. Stairwells and archways, for example, can be selectively removed in preparation for an additional wing of a commercial building.

Preparing for Demolition

In order to properly plan for a demolition, details about the building must be gathered. Two kinds of surveying take place: building and structural.

Building Surveying for Demolition

The purpose of building surveying is to determine:

proposed method of demolition

Structural Surveying

The purpose of structural surveying is to:

Demolition Permits

There’s more to getting a demolition permit than just heading down to the city building department and filling out an application. You will likely need to provide a detailed demolition plan. Other documentation may include an asbestos survey and, if required, certification for asbestos removal. You may need to provide documentation regarding the removal of exterior painted surfaces and dust suppression measures. In some cases you may need to agree that the demolition will be suspended if winds are blowing above a certain speed. Plans for how debris will be contained during demolition may also be required. Ultimately, you need to understand all the requirements for the demolition well in advance.

Implosion Demolition Process

There are generally five phases to the implosion demolition process: Safety preparation, dismantling, explosive installation, detonation, and cleanup.

Safety Preparation

Preparing for a safe implosion demolition generally involves methods for cordoning off the site, controlling rubble and debris, setting up internal communications, implementing worker safety protocols, and installing a security team (such as hiring a security company and coordinating with local police) to protect the surrounding neighborhood.


Sections of the building may be dismantled in advance of the implosion demolition. For example, to separate adjacent structures from the target building. It may make sense to remove parts of the building such as balconies to improve the performance of the implosion. Non-load bearing walls are typically removed. Preparatory dismantling may be required to create distance between the building and the road. Or to reduce vibrations from the explosion.

Explosive Installation

What type of explosives to use and where to place them is very carefully planned. Dynamite is typically used for concrete supports and columns. Cyclotrimethylenetrinitramine, which is commonly known as RDX, is used to collapse steel columns. There are techniques used to control the collapse of the building. For example, installing pre-stressed steel cables into the walls. There are different types of explosives that are used and options for detonators. The explosives are placed in structural columns throughout the building.

The timing of the detonation is critical. The explosives installed are detonated less than a second apart. The goal in most implosive demolitions is for the highest point of the rubble to occur at the core of the collapse. A blasting cap is used to ignite the primary charge explosives. It is detonated from a safe distance using an electrical detonator connected to a lead line.

Now the demolition debris is removed. This is typically done with excavators and skid steer loaders that place the debris onto trucks. Material that can be reused or recycled are separated out either onsite or carted off to a recycling facility. Some recycling, such as concrete crushing, may be handled at the demolition site. Ultimately this is an opportunity to generate income and reduce waste disposal. Part of the cleanup plan may require a final clearance report prepared by an industrial hygienist.

Famous Demolition Projects

Any demolition job is risky. But there’s no doubt that a tall building in the middle of a city is particularly risky. It takes a lot of skill, coordination, and know-how to pull off an implosion demolition. Here are two examples.

Champlain Towers South

In the case of the Champlain Towers South in Surfside, Florida, part of the building had already collapsed, killing nearly 100 people. In order for rescue workers to safely continue their search, it was determined that the whole building needed to be demolished.

Landmark Tower

The 30-story Landmark Tower in Fort Worth, TX was built in 1957. It stood empty for 16 years and the decision was made to demolish via the implosion method. A perfect implosion demolition brought the tower down in 2006.

Future of Demolition

Smart demolition is making it safer to dismantle old structures. 3D modeling lets the demolition team test their plan before putting it into action. Robotics are handling the more dangerous aspects of demolition. They’re also improving the accuracy and speed at which demolished materials are recycled.

Robotic Demolition

Husqvarna has a line of remote demolition robots. The DXR 140 can reach up 3.7 meters and reach forward 3.7 meters. It’s compact enough to step through a standard-sized doorway.

The Brokk 170 uses the SmartPower™ electrical system that can demolish concrete at near-silent levels. Attachments include breakers, crushers, and shears.

proposed method of demolition

Demolition Jobs

Many of the same skills that are in the construction industry are needed in demolition. You’re just tearing a structure down instead of building it up. The more specialized demolition jobs – where you are placing and detonating explosives – are typically on-the-job training or apprentice opportunities. Many demolition jobs require only a high school diploma or equivalency. Even though robotics is gaining popularity in demolition, a human must operate the controls.

Demolition has expanded well beyond the wrecking ball. In part because of an environmental focus that favors reuse and recycling. In part because of the rise of the robotic demolition. There are still plenty of jobs for humans in demolition. Many opportunities exist in the demolition field where only a high school diploma is required. Put safety first and the rewards will outweigh the risks.

Latest from Steel Giant Market

proposed method of demolition

Single Line Radio Remote Control Clamshell Buckets - Atlas 13 Cubic Yard Buckets

proposed method of demolition

2021 Hitachi ZW310-6 Wheel Loader

proposed method of demolition

2010 CAT 336DL Excavator with Digging Bucket

proposed method of demolition

(4ea) Double Drum Reverse Waterfall Anchoring and Mooring Hydraulic Powered Timberland Winches

Copyright © 2023 | | West Palm Beach Website Design | Privacy Policy

proposed method of demolition

asset recovery, rigging team with sling and interior demolition

Dust, Noise, and Vibration on Demolition Sites

Planning for dust, noise, and vibration can be an important part of demolition and dismantling, particularly in and near occupied buildings and in densely-populated areas. R. Baker & Son works closely with owners and facility managers to make sure that businesses can remain in operation while minimizing disruptions.  

Dust, noise, and vibration are often major concerns and must be addressed in detail. Methods for alleviating dust include wetting surfaces, capturing particles with fog or spray, and the use of exhaust fans. Temporary negative-pressure containment areas with airlocks for access and egress can be erected in facilities where a clean environment is absolutely critical. 

Tasks that will create noise and vibration require close coordination with owners to devise an appropriate schedule if the work can’t be performed while the facility is closed. For example, pneumatic hammer use can be confined to early morning hours, times during which most workers take a lunch break, or late in the afternoon. This allows management to plan ahead and work around these conditions without any unexpected surprises. 

About R. Baker & Son All Industrial Services

R. Baker & Son All Industrial Services, a Minority and Women-Owned Business Enterprise (M/WBE),  in business since 1935 , is a premier specialized contractor operating in the United States, Canada, and Puerto Rico, with over one hundred employees and an exemplary safety record (we have been directly involved in six sites that received VPP OSHA Safety Awards). R. Baker & Son is financially strong, with bonding capabilities of over $20 million. Capabilities include industrial and commercial demolition, rigging, machinery- and plant-moving, dismantling, decommissioning, plant and equipment relocation, interior demolition, selective demolition, warehousing, wrecking and razing, millwright, plant reconfigurations, heavy rigging, salvage, environmental services, remediation, decontamination, abatement, and investment and asset recovery.

R. Baker & Son - All Industrial Services 190 Boundary Road Marlboro, NJ 07746 732-222-3553

Full News Archive

Recent News

Machinery moving, assembly project, used conveyor system

proposed method of demolition

Project Management 123

Project Management Resources – Editable Documents

Building Demolition Methods and Techniques

Demolition of any structure is a ground to earth technique which means destroying down or falling down of a building with the help of equipment’s, machineries, and explosives or with manual techniques without affecting the surrounding.

Demolition means dismantling, razing, destroying or wrecking any building or structure or any part thereof by pre-planned and controlled methods.

Demolition is one of the most dangerous activities in the construction sector.

Structure demolition is a simple process in the case of small buildings or houses.

The building is brought down either manually or mechanically using large hydraulic equipment’s like elevated work platforms, cranes, excavators or bulldozers.

The building demolition work is to be performed safely and with number of different steps involved before and during the execution of a demolition process.

Various steps involved before the demolition process includes surveying the site of demolition, removal of hazardous materials if any, and preparation of demolition plan with techniques to be implanted, stability report and the precautionary safety measures to be taken for the workers and the surroundings.

Common equipment’s used for the demolition services and activities are like sledge hammer or rammers; excavators, bulldozers, tearing balls etc. and main explosives used are like dynamites and RDX. When explosive are used for the demolition, it is known as implosion.

Types of Building Demolition Methods

Demolition methods can vary depending on the area where it will be held on, time available, the building material, the purpose of the demolition and the way that debris is going to be disposed.

Time saving methods are more expensive than the slower ones.

If noise dust and vibrations are to be restricted, it will also add to the cost of demolition.

The demolition of a building can be total or partial. Total demolition is, in general, aimed at the recovery of the area for subsequent re-use, while partial demolition is aimed at the recovery of the building for refurbishing or rebuilding.

Total demolition generally is for old buildings and is performed using machines equipped with demolition hammers and pneumatic cutters or more simply with normal excavators.

In recent years the demolition of large buildings has also been conducted using explosives. This technique involves works by a specialized firm that can operate only after obtaining the government authorization.

Classification of Building Demolition Methods

Simple demolition methods:

The demolition tools are different types of buckets, demolition boom and elephant tusk.

They are mainly used to demolish masonry buildings but can also be used for concrete .

These types of equipment’s are mounted on a hydraulic excavator.

Hammering Technique:

Repeated hammering is often used to fracture and break concrete mainly due to occurring tensile and shear stress.

There are three levels of hammering:

– Stone chisel: It is operated by manpower and is not in using any more for concrete demolition.

– Hand-held breaker: There are three types of breakers – pneumatic, hydraulic or electric driven.

proposed method of demolition

The first type is relatively light and small but noisy compared with the second type.

Both need extra equipment but this is not needed for the third alternative.

Electrical breakers are less efficient and heavy.

– Impact hammer on a carrier:

This machine is manufactured in different sizes and strength f Rom huge ones to small light ones, which can be operated on floor and travel through doors.

The hydraulic type is most common, they can be remote controlled.

Hitting Demolition Technique

This is a common method for total demolition.

To demolish concrete elements a steel ball with a weight of 0.5- 2.0 ton is either dropped on the element or swung into it. This method demand shows ever a great deal of skill from the crane Operator.

The concrete element can after several hits be demolished in small pieces, although the reinforcement has to be rut afterwards.

The method can of course be dangerous, especially when tall cranes have to be used.

Process also causes considerable dust and Vibration, which is not acceptable in heavily built up areas.

Demolishing using Crushing Technique

A C-shaped frame or a strong jaw is either suspended or mounted on top of the arm of an Excavator.

This type of demolition equipment was developed in Japan.

There are many different variations of demolition equipment, which can break or pulverize reinforced concrete elements of most sizes and degree of reinforcements.

The jaws are quite efficient, silent; cause little dust and no Vibration.

Accordingly the jaws are well suited for concrete demolition in residential areas.

Abrasion Technique for Demolition

There are different demolition machines based on abrasion e.g. diamond drilling, sawing, wire sawing and water jet.

– Diamond drilling

The drilling device is always mounted on a stand.

Holes of 40-500 mm in diameter, are produced with considerable accuracy.

The drills are driven by pneumatic, hydraulic or electrical power.

Medium and heavy drilling Operations are carried out only with vehicle mounted drills.

When the holes are drilled side by side, the method can be used for demolition, however, not very efficiently but the method is very useful when refurbishing buildings.

It is a necessity to cool with water. The noise level is very high and of a high frequency.

– Diamond sawing

Sawing with a disc (maximum 1000 mm diameter) can also be interesting for total demolition when demounting elements of a concrete building or a structure. There are also special carriers for sawing, especially in Japan.

The elements can be used for a new building, hopefully for the same purpose as they were used for.

Need for making good is very small.

– Diamond wire

A loop wire saw with diamond bits can cut around the circumference of a Concrete section.

It is mostly used for cutting in rocks but can also be used for massive concrete structures.

– Water jet

This method is usually applicable for demolishing damaged surfaces.

A high pressure jet of water passes across the surface, penetrating into the weak concrete.

When the water washes away, it takes the damaged concrete with it.

Instead of digging to the same depth throughout, it only removes concrete down to a preset quality depth.

The method is very suitable for high quality repairs i.e. for bridges, airport runways etc.

Mostly, the equipment is mounted on a carrier, but it can be hand-held for small surfaces.

The noise level is very high; also the water jet has to be handled with great care, especially if hand-held.

Bursting Demolition Technique

Concrete and rock can be split by a bursting force in a predrilled hole.

– Hydraulic busters

Two forms of such equipment are commonly used.

The plunger buster consists of a central cylinder down the side of which a series of pistons are forced out.

Wedge busters consist of a steel wedge, which is retracted under hydraulic pressure.

In either case the bursters are often used in multiple arrangements fed from a common hydraulic power supply.

– Chemical expansive agent

Unslaked lime composite is mixed or absorbed with water and Injected or poured into a predrilled small hole.

The bursting effect takes from some hours up to a day.

There are no problems with dust, noise or Vibration when bursting except for the pre drilling procedure.

Demolition by Blasting

The use of explosives on demolition sites should be looked upon as the application of a controlled High energy force.

Operation has to be carried out by fully experienced personnel, who are licensed.

In most countries blasting on sites is covered by regulations.

For the demolition of concrete structures it is usual to drill holes obliquely into concrete to be removed at predetermined positions.

The holes are then charged with explosives which are electrically detonated in intervals.

Compared with other methods, the use of explosive on large and tall structures may show considerable financial savings.

The disadvantages are excessive ground Vibration which may Damage adjacent structures and air blast may cause superficial damage elsewhere.

Precautions should taken to stop flying debris.

Blasting can also be feasible for retrofitting reinforced concrete structures i.e. cutting piles, beams and making openings in slabs and thick walls.

Melting Technique for Building Demolition

Concrete and rebar are melted by the heat of combustion of metal or organic fuel, plasma and laser beam.

Only the first mentioned type, the thoracic lance method, is commercially availably.

Aluminium or iron alloy wires are enclosed in a metal pipe of rather small diameter.

The combustion of oxygen and metal melts concrete and rebar.

Method is noisy and special precautions have to be taken again fire and smoke.

Laser beam could be a method for the future.

Today complex and huge equipment are needed.

A carbon dioxide laser beam of very high energy melt and cut the concrete including the rebar.

Spalling Technique

Concrete cover is spalled by heating rebar electrically with very high current, which means that the rebar expand and cause tensile stress in the concrete.

This method has been studied for nuclear reactors in Japan.

Other Types of Building Demolition Services

Progressive Demolition

Progressive demolition is a technique to demolish, wrecking or taking out of any load-supporting structural member part by part before the building completely fall.

The heavy machinery or equipment includes large motorized vehicles such as bulldozers with rakes, backhoes, hydraulic excavators, and other similar machinery used for transporting, moving of materials at a demolition site.

Cranes equipped with wrecking balls, clamshells, or buckets are also considered heavy machinery.

Mechanism of Control Demolition

Equal to progressive demolition; it is commonly adapted to big catch area condition and usually practiced using explosion/implosion and wire rope pulling methods or any other suitable method.

Deconstruction or Top Down

Deconstruction or Top down method is the technique that proceeds from the roof to ground in a general trend.

There are particular sequences of demolition which may vary, depending on site conditions and structural elements to be demolished.

Wrecking Ball

The wrecking ball application consists of a crane equipped with a steel ball.

Destruction of the building is by the impact energy of the steel ball suspended from the crawler crane.

The wrecking ball operates outside the building.

This method is suitable for dilapidated buildings, silos and other industrial facilities. However, the operation requires substantial clear space. The application also demands high level skill operators and well maintained equipment.

Sharing is Caring:


  1. Different Stages of a Demolition Project Explained

    proposed method of demolition

  2. Demolition Plan

    proposed method of demolition

  3. Demolition Method Statement.pdf

    proposed method of demolition

  4. Risk Assessment & Method Statement for Demolition to Single Storey Structure

    proposed method of demolition

  5. 10 Things You Need To Consider Before Demolishing Your Home

    proposed method of demolition

  6. Controlled Demolition

    proposed method of demolition


  1. Beginning the demolition

  2. Demolition contractor :- 9599910666

  3. Internal demolition ✅ #demolition

  4. Buildings Demolishing Process 3

  5. Demolition , construction ,contact us, 9599910666

  6. How To Complete Interior Demolition


  1. Why Is the Scientific Method Important?

    The scientific method is important because it is an evidence-based method for acquiring knowledge. Unlike intuitive, philosophical or religious methods for acquiring knowledge, the scientific method relies on empirical, repeatable tests to ...

  2. What Are the Steps of the Scientific Method?

    The five basic steps of the scientific method are: make observations, propose a hypothesis, design and perform an experiment to test the hypothesis, analyze the data to see if it supports the hypothesis and, if necessary, propose and test a...

  3. What Are the Eight Steps of the Scientific Method?

    If you’ve ever had a great idea for something new, then you know some testing is necessary to work out the kinks and make sure you get the desired result. The steps that make up the scientific method generally fall into three phases: observ...

  4. What Is Demolition

    Manual demolition is also known as hand demolition. This method of demolition is especially useful for breaking small structures in densely

  5. Demolition Methods and Process for Building Structures

    1. Non-Explosive Demolition Method · a) Sledge hammer · b) Excavators and Bulldozers · c) Wrecking Balls · d) High Reach Excavators.

  6. 3 Types of Demolition Methods

    Commercial Demolition By Explosion or Implosion. To begin, we will tackle the most efficient method of demolition, the use of explosives.

  7. Building Demolition: Methods & Process

    Sledge hammer; Bulldozers; Wrecking balls; Standard and high-reach excavators. Implosive method. Implosive method is a type of demolition

  8. Different types of demolition methods for building & structures

    The building demolition was done by using implosion technique. Columns in the 11-storeyed structure were filled with explosive substances and

  9. Demolition Methods 101: A Thompsons of Prudhoe Guide

    Demolition Methods and Common Types · Total Demolition · Selective Demolition · Interior Demolition · Dismantling or Deconstruction · Explosive

  10. Demolition

    [edit] Other methods ; Gas expansion ; Hydraulic expansion ; Thermal reaction: Used together with wire · members ; Thermic lancing: Drilling or cutting silica

  11. The Demolition Process

    Standard and High Reach Excavators are the conventional method of Demolition used of buildings. The height of the building dictates which type of machine is

  12. Complete Guide to Construction Demolition

    Types of Demolition · Implosion · High Reach Arm · Wrecking Ball · Selective Demolition.

  13. News Press for demolition, rigging and ...

    Methods for alleviating dust include wetting surfaces, capturing particles with fog or spray, and the use of exhaust fans. Temporary negative-pressure

  14. Building Demolition Methods and Techniques

    Common equipment's used for the demolition services and activities are like sledge hammer or rammers; excavators, bulldozers, tearing balls etc.