Where it hides
| Material | Common in |
|---|---|
| Acoustic “popcorn” ceilings | Homes from the 1950s to the late 1970s |
| 9-inch by 9-inch vinyl floor tiles and mastic | Kitchens, basements, older flooring under carpet |
| Duct wrap and tape | Older forced-air systems |
| Pipe and boiler insulation | Older heating systems |
| Vermiculite attic insulation | Some homes before 1990 |
| Cement siding and roofing shingles | Mid-century homes |
| Drywall joint compound and textures | Before about 1980 |
| Stucco and plaster | Some older applications |
Why “leave it alone” is common advice
Asbestos fibers cause harm when inhaled. Material in good condition that won’t be disturbed releases few or no fibers. Encapsulating it or covering it, for example with new flooring over old tiles, can be a reasonable option.
Before any work
Have suspect materials tested before you scrape popcorn ceilings, demolish walls, replace floors or remove ducts. A certified asbestos consultant can sample and write a scope for removal. Abatement costs depend on the material, quantity and access.
For buyers
Note materials the inspector flags and plan testing if you intend to renovate. Factor abatement into renovation budgets for older homes.
Common questions
Can a home inspector identify asbestos?
An inspector can point out materials that commonly contained asbestos, but can't confirm it visually. Samples must be taken and analyzed by a lab.
Who removes asbestos in California?
Asbestos abatement work is done by contractors registered with Cal/OSHA and holding an asbestos certification from the Contractors State License Board. Local air districts also have notification rules for removal.