Asbestos Cement Sheets: Uses, Risks and Safe Handling

What Are Asbestos Cement Sheets?

Asbestos cement sheets are building materials made by combining cement with asbestos fibers. This mixture improves the strength, durability and fire resistance of the resulting product.

Asbestos is a natural mineral found in the earth’s soil. The mineral was prized during the 20th century but can cause cancer. The issue is asbestos can break apart when disturbed, and loose and sharp fibers contaminate the air while workers are present. When asbestos in products breaks apart, these fibers can be inhaled or swallowed.

These sheets are commonly used for roofing, wall cladding and partitioning. Their main appeal comes from being affordable, water-resistant and easy to work with on construction sites.

Key Properties of Asbestos Cement Sheets

• Flexural Strength – The addition of asbestos fibers increases the flexural strength, making these sheets more resistant to breaking under stress compared to plain cement boards.
• Water Absorption – Asbestos-cement sheets have relatively low water absorption, which enhances their performance in damp or humid environments.

Below is a quick comparison:

Usage and Alternatives

In the United States, there’s a ban on chrysotile asbestos, which is the most common type. As regulations have changed since the height of asbestos in the 20th century, fiber cement boards have replaced asbestos-cement sheets in many countries. Fiber cement boards use safer materials, such as cellulose fibers, but often offer similar performance characteristics.

Common Uses of Asbestos Cement Sheets

Asbestos cement sheets were valued during the 20th century for their durability, water resistance and low maintenance requirements. Their use spanned across various construction applications, particularly in commercial buildings, factories and warehouses.

Roofing Panels and Corrugated Sheets

Asbestos cement was widely used for roofing, especially in corrugated and flat sheets. These panels resist water penetration and provide a long-lasting, weatherproof barrier. Factories and warehouses often chose asbestos cement roofs due to their ability to withstand harsh climates.

The sheets came in various shapes, commonly corrugated for added strength. Installers appreciated how light they were compared to traditional clay or concrete tiles. The material’s fire resistance and insulating properties also made it suitable for commercial use.

Color and finish options included natural gray, but some manufacturers offered pre-painted versions for better appearance or corrosion resistance. The cost-effectiveness and minimal maintenance needs contributed to their popularity in large roof installations.

Exterior Wall Siding

Asbestos cement sheets proved effective as exterior wall siding on many commercial and industrial structures. Their smooth or textured flat sheet designs could be easily cut to size and installed in panels. These sheets offer a protective, waterproof layer that helps reduce long-term damage from moisture and pests.

Builders used them for everything from suburban homes to large factory and warehouse walls. The finish could be plain, rough or lightly patterned, and some products were paint-ready, allowing custom colors and improved weather resistance. This made asbestos siding a versatile choice for new construction and renovations.

Their resistance to rot and insect infestation was a key factor for their widespread use. Panels require only basic washing and occasional repainting for upkeep, eliminating the need for frequent repairs.

Eaves, Soffits and Interior Partitions

Installers utilized asbestos cement sheets for eaves and soffits due to their lightweight build and resistance to water. Unlike timber, asbestos panels do not warp or decay in humid conditions. This makes them especially reliable in protecting the roofline and promoting effective ventilation in commercial buildings and homes.

For interior partitions, asbestos cement flat sheets provide a durable, fire-retardant divider between rooms or workspaces, particularly in factories and offices. The material could be cut to fit tight spaces and provided a smooth surface ready for painting or tiling.

The finish was often plain, but paintable, so owners could adapt the look to their needs. Maintenance requirements remain low as panels rarely need more than occasional cleaning and repainting. This utility and low upkeep drove the continued use of asbestos through several decades.

Who Was at Risk of Exposure?

Asbestos cement sheets posed serious risks to certain groups due to direct handling, close proximity or ongoing work activities. Exposure often occurred during installation, removal, cutting, drilling or repair. Even today, exposure can occur during repairs or removal.

Construction and Roofing Contractors

Construction workers and roofing contractors faced – or still face currently – frequent exposure risks when installing or demolishing asbestos cement sheets. Cutting, sawing, or breaking these sheets releases fine asbestos fibers into the air. Workers involved in carpentry, roof replacement, or demolition tasks were commonly affected during the 20th century – and could be today.

Lack of protective equipment increases risk. Even today, during renovation of older structures, roofers and general laborers may encounter aged or damaged sheets that release fibers easily. Tasks using power tools – like circular saws, drills, or grinders – generate more airborne dust, especially in confined or poorly ventilated spaces.

Contractors without proper respiratory protection or dust control systems are particularly vulnerable. Prolonged or repeated exposure increases the likelihood of developing asbestos-related illnesses, including asbestosis and mesothelioma.

Homeowners Performing DIY Renovations

Homeowners conducting renovation projects may disturb asbestos cement sheets in older homes, especially those built before the 1990s. Cutting, sanding, or drilling the sheets during repairs or remodeling can release fibers, often without the person realizing the hazard.

DIY renovators usually do not have access to certified respirators, disposable coveralls or HEPA-filtered vacuums. Simple tools like hand saws or drills create asbestos dust, which remains airborne for hours. Standard cleaning methods – such as sweeping – do not remove asbestos fibers and can increase inhalation risks.

Children and other family members might also be exposed if dust contaminates living spaces. Improper disposal of debris adds further risks, as dust can be released during transport or placed in household garbage.

Utility and Maintenance Workers

Utility and maintenance workers sometimes encounter asbestos cement sheets in ceiling tiles, electrical panels, plumbing chases or exterior walls. Activities such as drilling for cable runs, repairing pipe penetrations, or mounting fixtures can disturb asbestos-containing materials.

Common equipment includes power drills, rotary tools or anchors, which are all capable of creating dust when penetrating sheets. Maintenance work in older commercial or industrial buildings may require accessing difficult or confined areas where asbestos dust accumulates.

Workers performing emergency repairs may lack the time or resources for proper containment and cleanup. Maintenance staff who handle repeated small repairs over years have an increased cumulative exposure risk, even if each incident seems minor.

Health Risks of Exposure to Asbestos Cement

Asbestos cement sheets can release hazardous fibers during handling and damage. Inhalation of these fibers may cause serious respiratory diseases and even types of cancer.

Mesothelioma is the most well-known asbestos disease. Exposure to asbestos is the only cause of mesothelioma. Asbestos can also cause lung cancer and ovarian cancer. Asbestosis is a noncancerous yet deadly lung-scarring disease caused by exposure.

Fiber Release During Cutting or Breaking

Damaged or disturbed asbestos cement sheets, especially those containing chrysotile asbestos, can release tiny asbestos fibers into the air. Cutting, drilling, or breaking these materials increases the number of fibers that become airborne, raising the risk of inhalation. Once airborne, fibers are not visible and do not have odor, making them difficult to detect without specialized equipment.

The following activities pose the highest health risk due to fiber release:

• Power sawing or grinding sheets
• Hammering or forceful breaking
• Sanding or scraping old surfaces

Wet methods and proper personal protective equipment reduce fiber release, but improper handling or lack of safeguards greatly increases exposure. The health risk from fiber inhalation depends on the amount released, duration of exposure, and the absence of effective controls.

Diseases Linked to Asbestos Sheet Exposure

Exposure to asbestos cement sheets has been linked to specific diseases, primarily affecting the lungs. When asbestos fibers are inhaled, they may penetrate lung tissue and remain there for years. Prolonged or heavy exposure increases the risk of developing these conditions. The main diseases associated with asbestos exposure include:

Early symptoms of these diseases may not appear for decades after initial exposure. There is no safe level of asbestos fiber inhalation, and even short-term exposure can be harmful under certain conditions.

How to Identify Asbestos Cement Sheets

Identifying asbestos cement sheets requires attention to visual characteristics, historical context and proper testing methods. Incorrect identification can lead to unnecessary risks, so each approach should be considered carefully.

Visual Signs and Common Sizes

Asbestos cement sheets often have a greyish-white or off-white color. Their surface is usually hard, with a slightly mottled or grainy finish. Some may show weathering – patches of discoloration, small chips, or surface lichen – especially if exposed outdoors.

Common sizes for these sheets are 1.2m x 2.4m (about 4ft x 8ft), but thickness can vary from 4mm-12mm. Edges may appear straight, but with occasional roughness from old sawing methods.

Unlike modern fiber-cement sheets, older asbestos sheets rarely show visible fibers. Some products also have identifying marks or codes imprinted on the smooth side, though this is not always present.

Age of Construction and Manufacturer Clues

Structures built or renovated between 1920 and 1985 are more likely to contain asbestos cement sheets. After the late 1980s, most countries began restricting or banning asbestos use in construction materials. Companies also stopped using asbestos due to legal claims against them and the multi-million-dollar settlements and verdicts.

Examining manufacturer labels or stamps on the rear or edge of a sheet can provide important clues. Brands such as James Hardie, Eternit, or other regional manufacturers were well-known producers of asbestos cement products. Serial numbers and product codes found in old catalogs or building records may also help confirm the product’s age.

Local building archives, council approvals or renovation permits may hold documentation about the materials used. If uncertainty remains, consider the era and brand as strong but not definitive evidence.

Professional Testing for Confirmation

Visual checks are not fully reliable, as modern fiber-cement products can look nearly identical to asbestos cement sheets. Physical disturbance should be avoided, as it may release hazardous fibers.

Certified asbestos assessors can take a small sample for laboratory analysis using techniques such as Polarized Light Microscopy (PLM) or Scanning Electron Microscopy (SEM). Results typically identify asbestos type and content within a few days.

It is important to avoid disturbing possible asbestos materials before testing. Engaging professionals for sampling and analysis ensures accurate identification and compliance with local safety regulations.

Safe Handling and Removal of Asbestos Sheets

Handling asbestos cement sheets requires strict safety protocols to prevent exposure. Proper removal and handling methods minimize health risks and help ensure compliance with local regulations.

Encapsulation Versus Abatement

Encapsulation is the sealing of asbestos material to prevent disturbance and breaking apart. This method is often used when asbestos cement sheets are in good condition. Experts use a special adhesive, which binds the asbestos fibers and prevents them from becoming airborne. The encapsulant is applied directly to the sheet surfaces, and its condition should be monitored over time.

Abatement refers to the complete removal of asbestos from the site. This process is often necessary when sheets are damaged or deteriorating, as broken material releases fibers. Abatement requires strict safety precautions, including personal protective equipment (PPE), isolation of the area, and controlled removal techniques to prevent fiber release.

Before choosing between encapsulation or abatement, it is recommended to consult with a local environmental protection department. They provide information about regulations and approved handling methods. While encapsulation is less disruptive, abatement may be required by law in some regions when sheets are no longer structurally sound.

Hiring Licensed Asbestos Abatement Professionals

Removal of asbestos cement sheets should only be performed by licensed professionals. These specialists have training in handling hazardous materials and use approved removal techniques to limit exposure risks.

Professional abatement services provide:

• Use of advanced containment systems to prevent asbestos fibers from contaminating surrounding areas
• Disposal of asbestos waste at approved facilities
• Compliance with local safety and environmental regulations

The environmental protection department may require notification before removal work begins. Homeowners should confirm that contractors have current licenses and experience with asbestos cement sheets.

Hiring qualified abatement professionals reduces safety concerns and lowers the risk of exposure to harmful fibers. The presence of asbestos should be clearly communicated to contractors and anyone who may enter the work area.

Legal Options for Asbestos Sheet Exposure Victims

Victims of asbestos cement sheet exposure often seek justice from corporations involved in manufacturing or distributing these products. Eligible individuals can explore specific legal actions, especially if they worked in construction, shipyards or related industries where asbestos was common.

Manufacturers That Produced Asbestos Cement Sheets

Several well-known manufacturers produced asbestos cement sheets for residential and industrial use from the early 1900s through the late 1980s. Examples include Johns Manville, CertainTeed, GAF Corporation and National Gypsum. These companies incorporated asbestos fibers to improve strength and fire-resistance in their panels and roofing products.

Most major manufacturers faced lawsuits as the health risks of asbestos became public. Some entered bankruptcy and set up asbestos trust funds, which are bank accounts with money filled ahead of time, to compensate victims. It’s important to identify the specific brand or product linked to a victim’s exposure, as this determines eligibility for legal action or trust fund claims.

Detailed records of sites and products are typically available in historic construction documents, purchase orders, or OSHA exposure logs. Victims and their families should gather this documentation to support any claim or lawsuit.

Legal Claims for Construction and Industrial Workers

People who worked on installation, demolition, or handling of asbestos cement sheets are often eligible to receive compensation for mesothelioma or other diseases. Legal claims include personal injury lawsuits, wrongful death actions and claims against asbestos bankruptcy trusts. Common eligible claimants include construction workers, plumbers, electricians and factory employees.

Deadlines for filing claims, called statutes of limitations, vary by state. Usually the time limit starts from the date of diagnosis of an asbestos-related illness, not from the exposure date, as many do not realize when they are exposed to asbestos. Legal representation is highly recommended because asbestos litigation is complex and evidence-heavy.

Experienced attorneys can help document occupational history, establish the link to asbestos exposure, and maximize potential compensation. Workers’ compensation is another possible avenue, but typically offers lower payouts than civil lawsuits or trust claims.

How to File a Mesothelioma Claim

Filing a mesothelioma claim starts by confirming the diagnosis through medical records and connecting the disease to documented asbestos exposure. Most claims require extensive detail: work history, locations, dates and knowledge of specific products or manufacturers involved.

Victims can file mesothelioma lawsuits against liable companies, submit claims to established asbestos trust funds, or both. A legal team will usually handle evidence gathering, paperwork, and negotiating settlements or trial proceedings. It is common for claims to be resolved through negotiated settlements rather than court trials.

Claimants must act quickly due to strict filing deadlines. Medical and employment records, witness statements, and proof of product identification strengthen a case. Legal assistance often works on a contingency basis, meaning no upfront charges for the victim. Lawyers only receive a percentage of the compensation IF the victim receives money from a settlement or successful verdict.

Final Thoughts: Durable Materials With Deadly Consequences

Asbestos cement sheets have been used widely due to their long-lasting strength and resistance to fire, water, and chemicals. Many industries valued these benefits, especially in construction and roofing.

However, the same materials that provide durability also carry serious health risks. Once asbestos fibers are released into the air, they can be inhaled and may lead to diseases like asbestosis, lung cancer and mesothelioma.

Key Risks:

• Inhalation of asbestos fibers
• Long-term exposure hazards
• Difficult and costly removal

Asbestos cement remains more stable and less likely to release fibers when undamaged. Issues occur mainly during cutting, breaking, or demolition.

Modern building regulations restrict or prohibit the use of asbestos cement sheets. Awareness of these health concerns shapes current best practices for handling or removing existing materials.

Safe handling involves avoiding disturbance, using protective equipment, and following legal guidelines for disposal. For existing buildings, regular inspections help minimize exposure risks.

Frequently Asked Questions About Asbestos Cement Sheets

Asbestos cement sheets are building materials made by mixing cement and asbestos fibers, primarily used for roofing and wall cladding. Their identification, handling and disposal require adherence to safety regulations due to health risks from asbestos fibers.

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.