Asbestos Fireproofing Materials: Uses, Risks, and Alternatives

For many years, builders used asbestos in fireproofing materials to prevent the spread of fire in homes, schools and workplaces. Asbestos was popular because it does not burn easily and can withstand high heat.

However, asbestos is very dangerous when breathed in. People who worked with these materials, or spent time in older buildings, were at risk of exposure and developing serious diseases, including types of cancer.

Today, people should know how to spot and safely remove asbestos to protect themselves and their families.

Asbestos in Fireproofing and Fire-Prevention Materials

Asbestos was once a common ingredient in fireproofing materials. The fibers can resist high temperatures and do not burn easily. This makes it useful for places that need extra fire protection.

Common uses of asbestos in fireproofing materials:

Spray-applied asbestos was often added to steel beams and ceilings. This helps stop fires from spreading quickly in large buildings. Builders also placed asbestos sheets behind walls and ceilings during the 20th century for extra safety.

The table below shows some examples of using asbestos fireproofing materials:

Fire doors and elevator shafts may have asbestos-containing panels. These panels slow down the spread of flames and heat.

Since it was cheap and easy to produce, asbestos was a popular choice for decades among manufacturers and industrial trades. Construction crews often used it without knowing the risks.

Asbestos in products used for fireproofing can remain an issue today.

Why Was Asbestos Used in Fireproofing?

Asbestos became popular in fireproofing because it can resist high heat. This makes it a protectant for buildings, ships, plants and factories, and many other places needing protection from fire.

Key Benefits of Asbestos in Fireproofing:

• Heat resistance – Asbestos could handle temperatures up to about 1,600°F (870°C).
• Strength – The fibers make building materials tougher and more durable.
• Lightweight – Products with asbestos are not heavy, which make them easy to use.

During the 20th century, manufacturers mixed asbestos with cement, plaster and sprays to cover walls, ceilings and pipes. This helps slow fires and protects the structure for longer during emergencies.

Asbestos was a popular choice for fireproofing from the first half of the 20th century until the 1980s. Starting in the 1980s, the health risks linked to asbestos became widely known, and legal issues built up for manufacturers.

In 2024, the United States banned the manufacturing and use of the most common type of asbestos. The current ban on chrysotile asbestos may save lives.

Types of Fireproofing Materials That Contained Asbestos

During the peak of use, asbestos was added to many different fireproofing products due to its resistance to high temperatures and its ability to slow the spread of fire. It was common in commercial, industrial and residential buildings for several decades.

Spray-On Fireproofing Insulation

Spray-on fireproofing insulation was commonly used to coat structural steel beams and ceilings in buildings. The insulation was applied as a wet mixture that hardened into a fire-resistant barrier. These products may contain high amounts of asbestos fibers even today if they have not been replaced or renovated.

The insulation helps delay the weakening or collapse of steel during a fire. Workers who mix or spray this material are exposed to asbestos dust. Over time, any disturbance in treated areas, such as during renovations, could release fibers into the air.

The risk of exposure increases if the fireproofing becomes damaged or deteriorated. Today, these materials must be tested and handled by professionals during removal or repair.

Asbestos Fire Blankets and Fire Curtains

Asbestos fire blankets and fire curtains were made from woven asbestos fabrics. These items can smother small fires, cover machinery, or act as barriers in theaters and factories.

Fire blankets could be found in schools, labs and kitchens. Fire curtains hang above theater stages to slow the spread of fire between the stage and audience. Both products could release asbestos fibers, especially if the fabric is torn or frayed.

Regular handling or movement of these items causes tiny asbestos fibers to become airborne. This is called “disturbing” asbestos, and it contaminated the air around workers and residents.

Today, safer alternatives like fiberglass are used for manufacturing fire blankets and curtains.

Fire-Resistant Plasters and Coatings

Many plasters and wall coatings were made with asbestos during the 20th century to improve fire resistance. These products were applied to walls, ceilings and structural supports. Asbestos was mixed with plaster or cement and then spread over surfaces as a thick coating.

Fire-resistant plasters can protect building materials from intense heat during a fire. Painters, plasterers and construction workers handled these materials regularly decades ago – and may encounter them today. When dry or disturbed, the plasters could release harmful asbestos dust.

Old buildings may still have these coatings, making repairs or demolition work potentially dangerous without proper safety procedures.

Heat Shields and HVAC Fire Barriers

Heat shields and heating, ventilation, and air conditioning (HVAC) fire barriers often contained asbestos. These materials lined air ducts, furnace compartments and other hot surfaces in commercial and residential buildings.

Asbestos-based barriers can protect against fire spreading through ventilation systems and help keep heat from damaging nearby structures. The products include cement sheets, matting and duct wraps.

Damage to these shields or barriers, such as from vibration or repairs, could release asbestos fibers into the air ducts. Anyone working with or around old HVAC systems may face exposure risks today.

Who Was Most at Risk of Exposure?

People face the greatest risk of asbestos exposure when they work directly with materials that contain asbestos fibers. These groups include insulation workers, construction workers, electricians and other repair trades. Others could be put at risk by simply spending time in buildings where these materials are present.

Construction and Demolition Workers

Construction workers faced high risk during the 20th century when they used asbestos fireproofing while building homes, offices and factories. Sprayers, insulators, roofers, drywall installers and others handled asbestos frequently up to the 1980s.

Demolition workers who tore down old buildings often disturbed asbestos, sending fibers into the air. These workers spent hours each day in contaminated environments. Inhaling these loose fibers increased the chance of lung diseases such as asbestosis and mesothelioma.

Demolition workers face this risk today. Demolishing old buildings with asbestos lurking inside disturbs and spreads fibers throughout the nearby work area.

Workers may not use appropriate protective measures, especially during the 1980s and earlier, before the risks were well-known. Cutting, drilling, or sanding asbestos products releases fibers, making it easy for workers to breathe in harmful dust.

Important facts:

• No level of asbestos exposure is considered safe.
• Unsafe work habits or lack of proper gear increases danger for these workers.

Maintenance Workers and Electricians

Asbestos exposure for custodians, HVAC technicians and electricians who work in older buildings occurs daily. They might cut into walls, ceilings or boilers containing asbestos to fix pipes or wiring.

When these materials are disturbed during repairs, fine asbestos dust could fill the air. Workers often wear little or no protection, relying on minimal personal safety training.

Electricians face risk when drilling through insulation, cleaning up debris, or repairing electrical panels. Maintenance staff sometimes sweep or vacuum dust that could contain harmful fibers.

Key risks for these jobs include:

• Touching or disturbing insulation or fireproof coatings
• Performing emergency repairs during leaks or system failures
• Long-term exposure from working in the same old buildings for years

Office Workers and Residents in Older Buildings

Office staff and building residents face lower-yet-present risks if they spend time in buildings with damaged or old asbestos fireproofing. Unlike workers who handle materials directly, office workers’ and residents’ exposure happens slowly over long periods.

If ceilings, walls or pipe coverings containing asbestos begin to crumble or break, fibers could enter the air and be inhaled. Heating and air systems might spread dust through offices, increasing risk across large areas.

People at the highest risk include those living, working or spending time in schools, apartments or high-rises built before the 1980s. Even short visits to these places could be a concern if asbestos was disturbed during renovations or repairs. Staff and tenants usually have little control over the condition of building materials.

Health Risks of Asbestos in Fireproofing Materials

Exposure to asbestos fibers in fireproofing materials carries serious health risks. The most common are types of cancer, specifically mesothelioma and lung cancer. Even small amounts of asbestos dust can cause harm, especially when breathed in over time.

Symptoms of these cancers often do not appear until decades after first exposure. This delay makes it hard to catch and treat these illnesses early.

Mesothelioma and Lung Cancer

Breathing in asbestos fibers can cause cancer. Mesothelioma is a rare and deadly cancer that affects the lining of the lungs or abdomen. Asbestos exposure is the only known cause of mesothelioma, which has poor survival rates.

Lung cancer is also caused by asbestos, although it’s not the only cause like for mesothelioma. Workers who spent years around asbestos fireproofing are at higher risk. Smoking also causes lung cancer. Smoking and asbestos exposure can increase the risk of the disease.

Asbestosis and Chronic Respiratory Conditions

Asbestosis is a lung disease that develops when asbestos fibers cause scarring inside the lungs. The scarring makes it hard to breathe. People with asbestosis often have shortness of breath, dry cough and chest pain.

Other chronic respiratory conditions from asbestos include pleural plaques, thickening and fluid buildup around the lungs.

Table: Common Conditions Caused By Asbestos Exposure

Symptoms of these conditions may take years to appear. Regular medical checks are important for anyone who has worked with asbestos fireproofing.

Identifying and Removing Asbestos Fireproofing

Asbestos fireproofing can still be present in many older buildings. Knowing what to look for and how to respond is important for safety and compliance.

Signs of Fireproofing That May Contain Asbestos

Asbestos was commonly used in spray-applied fireproofing on steel beams, ceilings and walls in buildings built before the 1980s. Signs of possible asbestos fireproofing include rough, gray or whitish material sprayed over pipes or metal structures.

Some areas to check include boiler rooms, attics and mechanical spaces. If insulation looks worn, damaged, or powdery, it could be asbestos-containing. Materials that crumble when touched (called “friable”) should be treated with caution.

Common products that might contain asbestos fireproofing:

Never disturb material that looks suspicious. Avoid sweeping or vacuuming areas with unknown dust.

Testing and Abatement Professionally

Only a certified professional should test for asbestos. Home testing kits are not reliable or safe. They can lead to inhaling or swallowing sharp asbestos fibers, which can lead to cancer 10-50 years later.

A trained asbestos inspector will collect samples using special methods and send them to a laboratory. If asbestos is found, federal and local laws require trained abatement teams to handle removal or containment.

Workers wear protective gear and use HEPA-filtered vacuums and barriers to keep fibers from spreading. Removing asbestos improperly can contaminate the air and pose serious health risks.

Legal Options for Victims of Asbestos Exposure

Victims who develop health issues from asbestos may have different ways to seek compensation for mesothelioma or other diseases. Legal action can help pay for medical treatments and other related costs.

Filing a Lawsuit or Asbestos Trust Fund Claim

People who were exposed to asbestos at work or through building materials may file lawsuits against companies responsible for their exposure. Mesothelioma lawsuits often focus on proving the company knew about the risks and failed to protect workers or customers.

If the company has declared bankruptcy, victims may still file a claim with an asbestos trust fund, which is set up to pay people harmed by asbestos. These funds have money set aside when the company goes bankrupt to ensure victims are compensated.

The process of filing a legal claim for payment from the at-fault company usually requires the victim to show medical evidence of an asbestos-related illness. Important documents can include medical records, work history, and exposure details. Many companies and trust funds have strict deadlines for filing claims, so it is important for victims to act quickly.

Filing a lawsuit or claim can result in compensation for medical bills, lost wages, and sometimes pain and suffering. The outcome depends on the details of each case, such as the amount of exposure and the type of illness.

What an Attorney Can Help With

An attorney with experience in asbestos cases can explain the legal process and which option – lawsuit or trust fund claim – is best. They help gather important documents, fill out paperwork, and make sure deadlines are met.

Lawyers can also talk to insurance companies, doctors and other attorneys on the victim’s behalf. They work to prove who was responsible for the exposure and how it caused the illness.

Often, attorneys offer a free first meeting and do not charge fees up front. This is called working on a contingency basis, which means the lawyer is not paid unless the victim wins the case. This gives victims access to legal support with no risk of paying out-of-pocket fees on top of their medical bills and lost wages. Having an attorney can make the process less stressful and improve the chance of a successful result.

Final Thoughts: Fireproofing Materials Were Meant to Protect — but Often Harmed

Asbestos helped keep buildings safe from fires for decades, if not centuries. It was cheap and easy to use. Its strong, heat-resistant fibers seemed like the perfect solution during the heart of the 20th century, when asbestos use was at a peak in construction work.

Many workers and families did not know the risks. Breathing in even small amounts of asbestos fibers could cause lung diseases years later, such as asbestosis or mesothelioma.

While fireproofing materials aim to protect, the danger comes from tiny fibers that could not be seen or smelled. These particles could stay in the body for decades before causing harm.

Some groups were more at risk:

• Construction workers
• Demolition crews
• Residents living in older buildings

Today, safer alternatives are used in new construction. Strict laws also help keep people safe when removing old asbestos materials.

Understanding both the benefits and the harms of these materials is important. It shows why safety steps are needed when dealing with asbestos even now.

Frequently Asked Questions About Asbestos Fireproofing Materials

Asbestos was often used for its heat resistance and ability to slow the spread of fire. Laws have changed how these materials are handled, removed, and replaced.

Sources & Author

About the Writer, David Statman

David Statman is a Content Writer for Mesothelioma Guide. He received both his bachelor's and master's in journalism from West Virginia University, and has been in medical publishing since January 2022. He previously worked in sports journalism, primarily reporting on West Virginia sports for a number of publications.

He lives in Delaware with his wife, dog and two cats, and avidly competes as a professional wrestler in the Philadelphia area.