If your house was built between 1920 and 1980 and the siding looks like flat, dense, chalky shingles roughly 12×24 inches, there’s a real chance you’re looking at asbestos cement product. Asbestos cement siding isn’t an immediate danger when it’s intact, but the rules around disturbing it are strict — and the consequences of doing it wrong are serious. Knowing what you have, what you can legally do, and what abatement actually costs prevents both health risks and the much more common problem of paying a contractor for unnecessary removal.
How to Identify Asbestos Cement Siding
Visual clues come close to a positive ID, but only lab testing confirms it. Common indicators:
- Manufactured 1920-1980 — the heaviest production was the 1940s through 1960s
- Rigid, brittle shingles or panels (snaps rather than bends)
- Surface texture imitating wood grain or stipple — common patterns from Johns Manville, GAF, and CertainTeed
- Typical sizes: 12×24, 8×16, or 4-foot lap planks
- Light gray, white, or pastel colors
- Two nails per shingle through pre-drilled holes
- Surface chalking and stippling visible at the edges
Take a small chip from a hidden area — behind a downspout, under a soffit — and send it to an accredited lab. Tests run $25-$50 per sample through services like EMSL Analytical. Bulk PLM analysis returns results in 3-5 business days.
Health Risk: The Honest Picture
Intact asbestos cement siding poses minimal risk. The asbestos fibers are bound in a Portland cement matrix at roughly 12-20 percent by weight. As long as the cement stays intact, fibers don’t release into the air. The danger appears when the material is broken, drilled, sanded, sawn, or crushed — any process that creates respirable dust.
The mineralogy matters too. Most asbestos cement siding used chrysotile (white asbestos), the least biopersistent of the regulated forms. Less common but more hazardous amphibole varieties (amosite, crocidolite) showed up in some specialty products. Either way, treat all suspect material as hazardous until you know otherwise.
Legal Rules for Removal
Federal regulations under the Clean Air Act NESHAP and OSHA 1926.1101 govern asbestos work in commercial settings and renovations. For owner-occupied single-family homes, federal rules largely exempt the homeowner doing their own work — but most states layer additional restrictions on top. New York, New Jersey, and Connecticut require licensed abatement for any asbestos work. California requires Cal/OSHA notification at 100 sq ft. Always check your state and county rules before any work.
Landfill disposal is the universal requirement. Asbestos waste must go to an approved monofill in sealed, labeled, double-bagged 6-mil poly. General construction dumpsters won’t accept it. Disposal fees run $50-$150 per cubic yard plus transportation.
Encapsulation: Often the Smart Choice
Removal isn’t always necessary or wise. If the siding is in good shape — no significant cracks, no missing pieces — encapsulation is often a better answer than abatement. Two approaches dominate:
Paint over it. Power-wash gently at under 1,500 PSI from at least 18 inches away to avoid breaking shingles. Let dry 48 hours. Prime with Sherwin Williams Loxon Concrete & Masonry Primer ($55 per gallon), then finish with two coats of Duration Exterior Acrylic. A typical 1,500 sq ft house runs $1,500-$3,000 in materials.
Side over it. Vinyl, fiber cement, or insulated panel siding can be installed over intact asbestos cement using furring strips. This adds insulation, modernizes the look, and avoids creating any respirable dust. Costs land at $8-$14 per sq ft installed depending on the new cladding choice.
Removal Costs and What Drives Them
Professional abatement of asbestos cement siding runs $7-$15 per square foot. A 1,500 sq ft exterior runs $10,500-$22,500. Pricing varies by:
- State licensing requirements (higher in CT, NJ, NY, MA)
- Containment scope (full negative-pressure enclosure vs. wet-method exterior)
- Height and access (two-story homes add scaffolding cost)
- Disposal distance to approved landfill
- Air monitoring requirements (mandated in some jurisdictions)
Get three quotes from licensed abatement contractors, not general remodelers. Verify each contractor’s license through your state environmental department before signing. Demand a detailed scope including containment method, fiber control plan, and final clearance testing.
DIY Considerations (Where Legal)
If your jurisdiction allows owner-DIY removal, the process must follow strict wet-method protocols. Mist each shingle with a garden sprayer containing water and a few drops of dish soap (the surfactant helps water penetrate). Carefully pry shingles intact — don’t break them. Lower each piece into a labeled 6-mil bag, double-bag, and seal. Wear a P100 respirator (not N95 — the fibers are too small), Tyvek coveralls, and nitrile gloves. Shower and bag clothing on completion. Rent a HEPA vacuum, not a shop vac.
Honest take: even where it’s legal, DIY abatement isn’t worth the risk for most homeowners. The cost savings rarely justify the long-term health exposure if something goes sideways. Encapsulation or licensed pro removal almost always beats the math.
What Replaces Asbestos Cement Siding
Fiber cement siding — products like James Hardie HardiePlank or Allura — is the modern non-asbestos analog. It mimics the same dense, paintable, fire-resistant performance without the regulated content. Installed cost runs $10-$16 per sq ft. LP SmartSide engineered wood at $8-$12 per sq ft is another popular drop-in choice.
Vinyl is cheaper at $5-$8 per sq ft but loses the architectural authenticity on older homes. For Tudor, Cape Cod, and bungalow styles, fiber cement keeps the proportions right.
Disclosure at Resale
Most states require seller disclosure of known asbestos-containing materials on the property disclosure form. Buyers’ inspectors flag suspected asbestos siding routinely, and many lenders require either testing or remediation as a condition of closing. Plan for disclosure, document any encapsulation work, and keep lab results and contractor paperwork in the homeowner file. Asbestos cement siding doesn’t kill a deal, but missing disclosure can void one.
