Are you planning to replace the roof on a house built between the 1920s and the 1980s? If so, the layer your roofer is about to tear off may not be ordinary asphalt at all.
Many mid-century homes were roofed, or later re-roofed, with asbestos-cement shingles. This rigid, durable product binds Portland cement with asbestos fiber, and many of these roofs are still in place today, sometimes hidden under one or more layers of newer asphalt.
Keep in mind that intact asbestos-cement shingles are generally considered low-risk while they sit undisturbed on the roof. The risk changes during the tear-off, when shingles can be broken, cut, or dropped. That is why testing, removal rules, and disposal all matter before the first crew climbs a ladder.
What Are Asbestos-Cement Shingles?
Asbestos-cement shingles are a mix of cement and asbestos fiber, usually chrysotile. They are sometimes called transite shingles, after one well-known product name, and published estimates put their asbestos content at roughly 10 to 20 percent by weight, though the real figure varies by manufacturer and era.
Once you know what to look for, they are fairly easy to spot. Common traits include but are not limited to:
- Weight and rigidity. The shingles are heavy and stiff, more like thin slate than a flexible asphalt shingle, and they snap rather than bend.
- Shape. Many were made as rectangles or squares, or in hexagonal and diamond patterns laid on point.
- Surface texture. Faces are often stippled, embossed with a wood-grain pattern, or finished with a mineral color coat that has faded to gray, green, or red.
- Edges and nail holes. Factory-punched nail holes and crisp, straight edges are typical, and a broken piece shows a gray, cement-like core.
That said, how a shingle looks only raises suspicion. Fiber-cement shingles made after asbestos was phased out can look nearly identical, and only a laboratory test can tell them apart.
Why The Tear-Off Is The Moment That Matters
Asbestos-cement is classified as nonfriable, which means that when it is intact it cannot be crumbled or reduced to powder by hand pressure. Under the federal asbestos NESHAP (40 CFR Part 61, Subpart M), it belongs to the Category II nonfriable group.
However, nonfriable does not mean harmless under every condition. If the shingles are sanded, ground, cut with power tools, or shattered, they can release fibers, and the material can then be treated as regulated asbestos-containing material.
This is why a roof replacement is different from everyday life under the roof. A careless tear-off, with shingles pried up by shovel, cut with a saw, and thrown into an open dumpster, is exactly the kind of disturbance the rules exist to prevent.
Additionally, asbestos-cement is rarely the only suspect material on an older roof. Roofing felt, asphalt-based roof cement, flashing mastic, and some asphalt shingles from the same era may also contain asbestos, so a thorough inspection samples more than the top layer.
When Is Testing Required?
The answer depends on who is doing the work and where the house is. Here is how the main layers of regulation fit together:
- OSHA (federal worker protection). The OSHA construction asbestos standard, 29 CFR 1926.1101, applies to any employer whose workers disturb asbestos, whatever the building type. It requires the employer to find out whether materials contain asbestos before work begins, and it sets specific work practices for removing asbestos-cement roofing.
- EPA NESHAP (federal air rule). The NESHAP inspection and notification requirements cover demolition and renovation at regulated facilities. In most cases this excludes residential buildings with four or fewer dwelling units, although there are exceptions, such as when several homes are demolished as one larger project.
- State and local rules. Many states, and some cities and counties, go further than federal law. They may require an asbestos survey before renovation, advance notice to the state environmental agency, or a licensed abatement contractor even on a single-family home.
As a result, a homeowner can hear different answers from different contractors. A roofer who says testing is not required may be correct under NESHAP for a single-family home and still be wrong under the state rule, or under the OSHA duty that covers their own crew.
Remember that testing costs little compared with getting this wrong. Even where no rule strictly requires it, a lab result gives every bidder the same facts, which makes their bids easier to compare.
How Testing Works
A certified asbestos inspector, or in some states a licensed asbestos professional, collects small samples from the roof, usually from more than one slope or layer. The samples go to an accredited laboratory, most often one accredited for bulk asbestos analysis under the NIST National Voluntary Laboratory Accreditation Program (NVLAP).
The standard test method is polarized light microscopy (PLM). Under both EPA and OSHA rules, a material counts as asbestos-containing when it is more than 1 percent asbestos.
Results usually take a few business days, and many labs offer rush service for an added fee. Costs vary by region: lab analysis often runs roughly $25 to $75 per sample, and an inspector visit commonly adds a few hundred dollars (estimates, not verified quotes).
Be aware that breaking off a sample yourself is not a good idea. Some states restrict who may collect samples, and a badly collected sample can disturb the very material you are trying to leave intact.
Who May Remove Asbestos-Cement Shingles?
Once a test comes back positive, the next question is who is allowed to take the shingles off. Again, the answer comes in layers.
Roofing Contractors Under OSHA
OSHA treats removing intact asbestos-cement roofing as Class II asbestos work. It does not automatically require a separate abatement company, but it does require a trained competent person on site and specific work practices.
The practices in the standard's Class II provisions include but are not limited to:
- Removal in intact pieces. Shingles come off whole wherever feasible instead of being broken or crushed.
- Wetting. The material is kept wet during removal to hold down dust.
- No abrasive tools. Sanding, abrading, and cutting with high-speed power tools are prohibited.
- Controlled lowering. Removed material is lowered to the ground by a covered chute, hoist, or similar method instead of being dropped or thrown.
- Prompt containment. Removed pieces are bagged, wrapped, or placed in a closed container instead of being left loose on the roof or lawn.
In other words, some roofing contractors are trained and equipped to remove asbestos-cement shingles under these rules, and others are not. It is fair to ask each bidder directly which kind they are.
Licensed Abatement Contractors
Many states require asbestos removal to be done by a state-licensed abatement contractor with certified workers and supervisors. Some of those states apply this only to friable material, while others include nonfriable roofing once a job passes a certain size.
When an abatement contractor is required, the job usually involves two contractors. The abatement firm removes and disposes of the asbestos-cement layer, then the roofer installs the new system, and the roofer sometimes manages both under one bid with abatement as a subcontracted line.
If your roofer plans to bring in another company for this phase, our guide to roofing subcontractor crews covers what to ask about licensing, insurance, and who is responsible for the work.
Homeowners Doing Their Own Removal
Some states allow homeowners to remove asbestos from their own owner-occupied single-family home without a license. Keep in mind that this exemption rarely covers friends or hired helpers, and the disposal rules still apply to the owner.
Of course, the work itself is heavy and slow, and it happens at height on a brittle surface. Before you consider it, check the exact requirements with your state environmental or health agency and your local building department.
Can You Overlay Instead Of Tearing Off?
An overlay, where new roofing goes on over the existing layer, can look like a way to avoid abatement entirely. However, it is rarely a practical option over asbestos-cement.
The roof recover provisions of the International Residential Code (Section R908.3.1.1 in recent editions) do not allow re-covering over slate, clay, cement, or asbestos-cement tile. Many building officials apply the same reasoning to asbestos-cement shingles, which can crack as new fasteners are driven through them, and that cracking is itself a disturbance.
What's more, an overlay adds weight, hides the condition of the decking, and simply hands the abatement question to the next owner. For a broader look at the trade-offs, see our comparison of tear-off vs overlay.
Disposal: Where The Shingles Go
Asbestos waste cannot go into a standard construction dumpster and on to any landfill. Disposal requirements typically include:
- Wetting and wrapping. Removed material is kept wet and sealed in heavy plastic, commonly 6-mil polyethylene, or in leak-tight containers.
- Labeling. Packages carry asbestos warning labels, and on regulated jobs they also name the generator of the waste.
- Approved landfills. The waste must go to a landfill permitted to accept asbestos, and many of these require advance scheduling.
- Paperwork. Regulated jobs use a waste shipment record that tracks the material from the site to the landfill, and some states require one even for residential work.
Accordingly, disposal often shows up as its own line item in a bid instead of being folded into the general dumpster fee. Landfill fees for asbestos waste usually run higher than rates for standard construction debris, and they vary widely by region.
The Bid Line Items To Expect
A clear bid shows the asbestos part of the job on its own lines instead of folding it into one lump sum. Here is a list of the line items you should expect when asbestos-cement shingles are involved:
- Asbestos inspection and testing. The inspector visit, the number of samples, the lab analysis, and whether the report covers every roof layer and the flashing materials.
- Notification and permit fees. Any state notification fee, local permit, or asbestos-specific permit, and who files it.
- Abatement labor. Removal of the asbestos-cement layer, usually priced per square (100 square feet), with the method (wet, intact removal) spelled out.
- Containment and site protection. Poly sheeting on the ground, a covered chute or hoist, and protection for landscaping, windows, and HVAC intakes.
- Waste packaging and disposal. Wrapping materials, a lined or sealed container, hauling, landfill fees, and the waste shipment record.
- Additional layers. Any asphalt layers above the asbestos-cement, priced as a standard tear-off, and any asbestos-containing felt or mastic below it.
- Decking repair allowance. A per-sheet price for replacing damaged sheathing once the old roof is off.
- Clearance or final inspection. A visual inspection or air sampling after abatement, where the state or the homeowner requires one.
The decking line deserves particular attention. Older homes often have plank sheathing with gaps, and boards under an asbestos-cement roof may now be brittle; our article on roof decking replacement explains how those allowances are typically written.
What Abatement Costs Can Look Like
Abatement pricing depends on the state, roof size, pitch, access, number of layers, and distance to the landfill. As a rough reference only, regional quotes for removing asbestos-cement roofing are often estimated at a few hundred dollars per square on top of the standard replacement cost (estimate, not verified).
For the replacement side of the job, see our breakdown of how much a roof replacement costs in 2026. Keep in mind that a quote far below the others may come from a crew that plans to skip the wet, intact removal and proper disposal the rules require.
Comparing Bids On Equal Terms
When bids come in, measure each one against the same scope. Compare the number of squares, the number of layers, the removal method, who holds the abatement license, and whether disposal and the waste shipment record are included.
Our guide to comparing roof estimates explains how to line bids up so that a missing line item does not pass for a lower price. If a bidder cannot tell you how the asbestos-cement layer will come off and where it will be disposed of, treat that as a real gap.
How Asbestos Affects The Schedule
Abatement adds steps that an ordinary tear-off does not have. Waiting on lab results, any required notice period before work starts (up to about ten working days in some cases), and landfill scheduling can all push back the start date.
Once work begins, removal usually goes slower than a standard tear-off, because the shingles are taken off whole and lowered instead of shoveled off. For the general timeline of the rest of the project, see how long a roof replacement takes.
Questions To Ask Before You Sign
Before you choose a contractor, it helps to get answers to the asbestos questions in writing. Some examples of questions worth asking include:
- Testing. Has the roof been tested, and will you share the laboratory report?
- Licensing. Who will do the removal, and what state license or certification do they hold?
- Method. Will the shingles be wetted and removed intact, and how will they be lowered to the ground?
- Disposal. Which landfill will take the waste, and will I get a copy of the waste shipment record?
- Insurance. Does the contractor's liability coverage include asbestos work, or does it exclude it?
The insurance question is easy to miss. Many general liability policies exclude asbestos-related claims, so it is reasonable to ask for a certificate showing coverage for this specific work.
For a wider vetting checklist, see our guide on how to find a reputable roofer. After all, the asbestos-cement layer is the part of the project where training and paperwork matter most.
The Bottom Line
Asbestos-cement shingles are manageable when they are identified early, removed intact by a properly trained crew, and taken to an approved disposal site. The homeowners who run into trouble are usually the ones who discover the material halfway through the tear-off.
If your home was built or re-roofed in the mid-twentieth century, start with a test, check your state's rules, and ask every bidder to price abatement and disposal as separate line items. That way, every cost is known before you choose the new roof.
This article is for informational purposes and is not financial, mortgage, or contractor advice. Consult a licensed professional in your jurisdiction.