Asbestos Roof Shingles: Identification, Risks and Options

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Older roofs across the country, including on some Front Range bungalows, garages and outbuildings, still carry gray, rigid shingles that look a little like slate. Some of them are asbestos-cement products. Others are ordinary asphalt shingles from an era when asbestos also found its way into roofing felts, mastics and coatings. Asbestos roof shingles are generally stable while intact, which is good news, but the moment they crack, get pressure-washed or are torn off during a reroof, the picture changes. This guide explains how to recognize materials that may contain asbestos, how condition affects risk, and how the main options compare: leaving the roof alone, coating it, overlaying it or having it professionally removed. It summarizes EPA and OSHA guidance current as of 2026 and is general education, not a substitute for an accredited asbestos inspector, a licensed roofer or your local building department.

Part of our Asbestos in the Home guide — start there for the full picture →

What Are Asbestos Roof Shingles?

EPA lists roofing and siding shingles among the places asbestos may be found in homes. Its overview page also names roofing shingles and asbestos cement products among the manufactured goods made with asbestos, explaining that the mineral fiber was used for its strength and heat resistance in building materials for insulation and as a fire retardant. Roofing was a natural fit: shingles had to shed water, resist fire and last for decades in harsh weather.

In practice, “asbestos roof shingles” covers a few different products that are worth separating.

Asbestos-cement shingles

The best-known type is the asbestos-cement shingle, made from portland cement reinforced with asbestos fibers. These shingles are typically rigid, thin and brittle compared with asphalt. They were often made to imitate slate, sometimes in rectangular shapes and sometimes in a diamond or hexagonal pattern laid on point. Many weathered to a flat gray, though some were made in red, green or other colors. Older units can feel chalky or powdery on the surface as the cement matrix weathers. Nail holes are often pre-punched, and edges may be slightly beveled.

Those traits suggest an asbestos-cement product, but they don’t prove it. Fiber-cement roofing made without asbestos looks similar, and natural slate can be mistaken for it from the ground. Our guide to asbestos cement covers the wider family of cement products, including pipes, panels and board.

Cement shingles were popular partly because they did not burn, did not rot and held up well to sun. Those same qualities mean many are still on roofs decades later, often on garages, sheds and porches that were never reroofed. A detached garage with a gray diamond-pattern roof is a common sight in older neighborhoods, and it deserves the same caution as the main house.

Asphalt shingles, felts and mastics

Asbestos also appeared, in some products and periods, in asphalt-based roofing: certain shingles, the felt underlayment beneath them, roof coatings, flashing cements and mastics. These materials look like ordinary roofing, so there are fewer visual clues at all. OSHA’s construction asbestos standard refers specifically to asbestos-containing roofing felts, roof flashings and asphalt roof coatings, cements and mastics, which shows how many layers of a roof system may need to be considered. Most asphalt shingles sold in recent decades are not asbestos products, but a roof with several older layers, or a flat section with built-up felt and tar, deserves a closer look before tear-off.

For a broader view of the whole roof assembly, including decking and flashing materials, see our main guide on asbestos roofs.

How to Identify Possible Asbestos Roofing

EPA’s homeowner guidance says that, generally, you can’t tell whether a material contains asbestos simply by looking at it, unless it is labeled, and that if in doubt you should treat the material as if it contains asbestos and leave it alone. Identification is therefore about building suspicion, not reaching a verdict.

Clues worth checking from the ground or from a ladder at the eaves:

• Age of the roof. Roofing installed before the 1980s is the main concern. Ask the seller, check permit history with the city or county, and look for old receipts.
• Rigidity. Asbestos-cement shingles do not flex. Asphalt shingles bend and have granules on top.
• Shape and pattern. Slate-like rectangles, diamond or hexagonal patterns, and uniform thin profiles are typical of cement shingles.
• Surface. A chalky gray face with weathered texture and few or no granules suggests cement rather than asphalt.
• Matching siding. Homes with cement roofing sometimes have matching cement siding. Our page on asbestos siding describes those panels.
• Layers. Two or three roofs stacked on top of each other may hide older felts or shingles under a newer surface.

Avoid prying a shingle loose, scraping the surface or breaking a corner to look at the cross-section. Those are exactly the actions that can release fibers. If a loose shingle has already fallen to the ground intact, it can be photographed and left in place until someone qualified samples it.

Best Asbestos Test Kit: our top 3 picks

Product	Best for	Key features	Price	Buy
Seeml Labs Asbestos Inspector in a Box	Verifiable lab accreditation	1 sample, lab included Gives an NVLAP lab code 2–3 business days	$22.00as of Nov 6, 2026 10:50 am GMT+0000	Buy now →Check current price
SLGi 1-Pack (5 Day)	Single sample with return postage	1 sample, PLM by EPA 600/R-93 Prepaid ground return label included	$35.00as of Nov 6, 2026 9:39 am GMT+0000	Buy now →Check current price
Asbestos-Sampling.com 2-Sample	Type and percentage in the result	2 samples, 72-hour lab Reports asbestos type and concentration	$59.95as of Nov 6, 2026 9:39 am GMT+0000	Buy now →Check current price

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See every pick compared: Best Asbestos Test Kit →

Roof Material Table: Era, Risk and Action

The table below summarizes common roofing materials found on older homes. Dates are broad patterns, not cutoffs, and each row is a reason to consider testing rather than a conclusion.

Why Condition Matters More Than Presence

Asbestos-cement shingles are a non-friable material when intact, meaning the fibers are locked into the cement and cannot be crumbled to powder by hand pressure. EPA explains that, in general, exposure may occur only when asbestos-containing material is disturbed or damaged in some way to release particles and fibers into the air, and that undamaged material left alone is not likely to pose a health risk. An intact roof that is simply shedding rain is low on the list of household concerns.

The risk climbs with activities that break or abrade the material. EPA’s homeowner guidance lists cutting, tearing, sanding, sawing, drilling and scraping as ways asbestos material can release fibers. On a roof, those translate into a few common situations.

Breakage and walking on the roof

Cement shingles are brittle. Walking on them, propping a ladder against the edge, or dropping tools can crack them, and each crack creates fresh broken edges and small fragments. Satellite dish installers, chimney sweeps, gutter crews and solar installers may all need roof access. Ask them about suspect shingles before they climb up, and expect some to decline or to require testing first.

Power washing

Pressure washing an old cement roof to remove moss or lichen is a common mistake. A high-pressure stream can erode the weathered surface, blast loose material into gutters, onto the yard and against the house, and leave the shingles more porous than before. If the roof is suspect, avoid power washing, and talk to a professional about gentler cleaning or whether cleaning is needed at all.

Weathering and age

Over decades, cement shingles can become softer and more powdery at the surface, and corners can break away. Gutter debris may include small gray chips. EPA suggests keeping an eye on asbestos-containing materials and checking them over time for signs of wear or damage. From the ground, binoculars and a camera with zoom are useful for periodic checks without climbing.

Hail-damaged roofs on the Front Range

Colorado’s Front Range sees frequent hailstorms, and hail is one of the main reasons local roofs are replaced. Hail can crack or puncture older shingles, and that damage can change an intact, stable roof into one with broken material. After a storm, an insurance adjuster or roofer may recommend full replacement. If the roof is old enough to be suspect, testing before tear-off helps everyone plan, and the cost of proper handling may be worth raising with your insurer early. Coverage for asbestos handling varies by policy, so ask rather than assume. Avoid climbing up after a storm to pick up broken pieces yourself.

Testing Before Repairs or Replacement

EPA says that if building materials aren’t damaged and won’t be disturbed, testing isn’t needed. Testing becomes important before any repair, reroofing, solar installation or demolition that will disturb the roof, and after damage such as hail impact.

EPA recommends that a trained and accredited professional take samples, notes that incorrect sampling can be more hazardous than leaving material alone, and states that sampling yourself is not recommended. Roofs add fall risk on top of that. For most homeowners, a professional inspector who can sample shingles, felt and flashing materials in one visit is the practical choice. Some homeowners use mail-in kits for a fallen piece that is already on the ground; our review of asbestos home testing kits explains how kits and accredited labs work, and our guide to reading asbestos test results covers report terminology.

Under OSHA’s construction standard, asbestos-containing material means material with more than 1 percent asbestos. That threshold is used in worker protection rules, and it is a useful reference point when reading results, though local rules may handle low percentages differently.

Options: Leave, Coat, Overlay or Remove

EPA’s homeowner guidance frames the choices around condition. Usually the best thing is to leave material in good condition alone. When material is more than slightly damaged or will be disturbed, EPA describes repair (sealing or covering, with the asbestos left in place) and removal, both carried out by trained and accredited professionals.

Leave the roof in place

If shingles are intact, the roof does not leak and no work is planned, leaving it alone is often reasonable. Keep foot traffic off it, avoid power washing, clean gutters gently by hand with gloves, and monitor its condition after storms.

Coating or sealing

Some contractors offer coatings designed to seal weathered cement surfaces. A coating may reduce surface erosion and extend service life, which fits EPA’s description of sealing as a repair method. Results depend heavily on the product, the roof’s condition and surface preparation, and preparation that involves aggressive cleaning or scraping can defeat the purpose. Treat coating claims cautiously and ask how the contractor will prepare the surface without disturbing it.

Overlay

Installing a new roof over old shingles keeps the asbestos material in place and avoids tear-off, which EPA’s covering approach broadly resembles. Overlays have real limits, though. Building codes typically restrict how many layers a roof may have and may prohibit overlay over certain materials or damaged decks. The added weight must be within what the structure can carry. Fastening a new roof through brittle cement shingles can crack them. Check with your local building department and a licensed roofer before assuming an overlay is allowed. Our guide to ridge caps covers one of the details that changes with any new roof surface.

Professional removal

EPA notes that removal may be required when remodeling will disturb the material or when damage is extensive, and that improper removal may increase exposure. OSHA’s standard lists removal of roofing and siding shingles among Class 2 asbestos work, and its roofing provisions require that roofing material be removed in an intact state to the extent feasible, that wet methods be used for material that is not intact, and that dust from power cutting of certain built-up roofs be collected with HEPA equipment. Those rules apply to employers and workers, but they show what careful removal looks like. Our page on asbestos roof removal walks through the process, and our guide to asbestos removal pricing explains cost factors.

Disposal is regulated too, and landfills that accept asbestos waste usually require it to be wetted, wrapped and labeled. In Colorado, contact the state health department to confirm current homeowner and contractor requirements, and see our overview of asbestos abatement in Colorado for how local contractors are typically involved.

Questions to Ask a Roofer or Abatement Contractor

Quotes for an older roof can vary widely, partly because contractors make different assumptions about what is under the surface. Asking the same questions of every bidder makes the quotes easier to compare and shows which crews have handled suspect roofing before.

• Has the roof been sampled, and which layers? A result for the top shingle says nothing about felt, older shingles underneath or flashing cement. Ask whether every layer that will be disturbed has been included.
• Who will do the removal? Some roofing companies handle suspect material with their own trained crews; others subcontract to an abatement firm. Ask for proof of the training or accreditation each worker holds. EPA’s homeowner guidance recommends asking professionals to document their completion of federal or state-approved training.
• How will shingles come off? Look for answers that describe removing pieces whole, wetting broken material, lowering debris rather than throwing it, and avoiding power tools where possible. Those answers line up with the intact-removal and wet-method practices in OSHA’s roofing provisions.
• How will the yard, gutters and siding be protected? Ground sheeting, gutter cleaning and a plan for stray chips matter, because fragments often end up in flower beds and downspouts.
• Where will the waste go? Ask which disposal site will accept it and how it will be packaged and labeled.
• Is there a written contract? EPA suggests getting a written contract that specifies the work plan, cleanup and the federal, state and local regulations the contractor must follow, along with written assurance at the end that procedures were followed.

EPA also recommends avoiding a conflict of interest by using separate firms to assess the problem and to remove the material. On a straightforward roof job that may feel like overkill, but on a large or damaged roof an independent inspector can confirm that cleanup was complete before the new roof goes on.

Common mistakes on older roofs

Most problems with asbestos roofing come from routine maintenance done without thinking about the material. A homeowner rents a pressure washer to brighten a mossy roof. A handyman walks across brittle shingles to clear a downspout and leaves a trail of cracks. A storm-chasing crew strips the roof in an afternoon with shovels and drops everything into an open trailer. A solar installer drills dozens of mounting holes through untested cement shingles. Each of these turns a stable material into a disturbed one. The common thread is skipping a test that would have taken a few days and cost far less than cleaning up a contaminated yard.

Buying, Selling and Insuring a Home With an Older Roof

Buyers who see a slate-like gray roof on an older home should ask about its age and history during the inspection period. A general home inspection focuses on roof condition and remaining life, and inspectors may note that a material is of a type that could contain asbestos without sampling it. If replacement is likely in the next few years, testing during the option period can give real numbers to negotiate with.

Sellers with lab results or removal records should keep them with the house paperwork. Insurers may ask about roof age and type, especially in hail-prone areas, so having documentation helps. Whatever the outcome, an intact asbestos-cement roof is a known quantity that can be managed. For a wider view of asbestos and lead issues in older housing, see our asbestos and lead resource center and the asbestos topic hub.

Safety Habits for Homeowners and Contractors

A few simple rules cover most of the risk:

• Do not walk on suspect cement shingles. Use binoculars or a zoom camera for inspections.
• Do not power wash, scrape, sand or grind suspect roofing.
• Do not cut, nail through or drill old shingles for antennas, dishes or panels without testing first.
• Leave broken pieces in place after storms, and keep children and pets away from debris.
• Tell every contractor who will be on the roof that the shingles are suspect.
• Test before any reroof, and plan removal with a trained, accredited contractor.

EPA’s guidance on health effects lists lung cancer, mesothelioma and asbestosis as major diseases associated with asbestos exposure, with symptoms that may take many years to appear. Anyone worried about past exposure from roofing work should talk with a physician about their history.

References

• U.S. EPA. Learn About Asbestos
• U.S. EPA. Protect Your Family from Exposures to Asbestos
• Occupational Safety and Health Administration. 29 CFR 1926.1101, Asbestos
• U.S. EPA. Asbestos Laws and Regulations

Dealing with an older gray roof after a Front Range hailstorm? Get in touch with us and we can point you toward a sensible testing plan before the tear-off crew arrives.