Where Asbestos Hides in Older Homes

If your home was built or last remodeled before the 1990s, there is a real chance asbestos is hiding somewhere inside it. Because asbestos was valued for fireproofing and durability, it was mixed into a surprising range of common building materials. Knowing where it tends to hide helps you avoid disturbing it during repairs and renovations.

Common Places Asbestos Is Found

Asbestos can turn up almost anywhere in an older home, but these are the usual suspects:

• Attic and wall insulation — especially loose-fill vermiculite insulation, some of which was contaminated with asbestos.
• Pipe and boiler insulation — the white, chalky wrap around old heating pipes, boilers, and ducts is a classic source.
• Vinyl floor tiles and sheet flooring — along with the black "mastic" adhesive used to glue them down.
• Popcorn and other textured ceilings — sprayed-on acoustic ceilings from this era often contain asbestos.
• Drywall joint compound and some plasters used to finish walls and ceilings.
• Cement siding, roofing shingles, and "transite" panels on the exterior.
• HVAC duct wrap and the tape on duct connectors.

You Cannot Identify It by Looking

It is impossible to tell whether a material contains asbestos just by looking at it. Two tiles that look identical can be completely different — one harmless, one not. The only reliable way to know is to have a small sample collected and analyzed by an accredited laboratory. That is why testing is the first step before any project that would cut, scrape, or demolish these materials.

What to Do Before You Renovate

Planning to pull up old flooring, scrape a textured ceiling, replace insulation, or open up walls in an older home? Treat suspect materials as if they contain asbestos until proven otherwise. Do not sand, saw, or sweep them. Keep the area undisturbed, and have a licensed inspector test before the work begins. If asbestos is confirmed, a certified abatement contractor can remove or safely seal it so your project can move forward without putting your household at risk.

The good news is that intact asbestos in good condition can often be left in place or professionally sealed rather than removed. The key is to find out what you are dealing with before a renovation forces the decision for you.