Asbestos Testing & Surveys in Sacramento, CA

What Gets Sampled

A sample is a piece of the material about the size of a thumbnail, cut or cored out through its full thickness and sealed in a labeled container on the spot. Each different material is its own sample set: the ceiling texture, the drywall joint compound, each layer of flooring, the adhesive under it, duct tape, pipe wrap, stucco, roofing. A material that looks the same in two rooms but went in at different times, such as a hallway patched during a later remodel, is sampled as two materials. The spot where a sample came out is wetted beforehand and patched afterwards so the cut edge is not left exposed.

How the Lab Reads It

Most building materials are analyzed by polarized light microscopy (PLM). The analyst looks at the sample under a microscope with polarizing filters and identifies asbestos fibers by their optical properties, then estimates what share of the material they make up. A report lists every sample, the asbestos type if any was found (chrysotile is the most common in houses; amosite and others turn up in some insulation), and the estimated percentage. A result of "none detected" applies to that sample only, which is why a survey takes several samples of anything that covers a large area.

Point Counting for Low Results

A visual estimate is coarse at the low end. Sac Metro Air District Rule 902, section 501.2, requires any survey result under 10% to be verified by point counting, a slower PLM method that counts fibers at hundreds of fixed points across the slide. This comes up often with joint compound and some mastics, which can come back at a few percent. The rules behind it are covered on the Rancho Cordova area page, where the district's FAQ answers are summarized.

Spot Testing Versus a Full Survey

For a homeowner replacing one floor or one ceiling, testing only the materials that work will touch is usually enough. A full survey covers every suspect material in the area being renovated or the whole building being demolished, and records where each one is and how much there is. Sac Metro Air treats anything other than wood, glass or metal as suspect, and for a regulated building the survey has to exist before the building permit is released. Owners of apartment buildings with five or more units, common in Carmichael, are the ones most often caught out by this. For a teardown, the survey is the first step of abatement before demolition, and a City of Sacramento wrecking permit for a commercial building waits on the air district's sign-off.

Build Year Does Not Settle It

Federal restrictions came in pieces: spray-applied surfacing in 1973 and 1978, patching compound in 1977, and a broad 1989 ban that a federal appeals court mostly overturned in 1991. Homes in Citrus Heights, largely built in the 1970s, sit right across those dates, and houses built in the 1980s, a fifth of the stock in Fair Oaks, are not exempt by age either. Across the river, Yolo-Solano AQMD recommends that even an exempt homeowner have the work area surveyed by someone who has completed an EPA-approved Building Inspector course; the West Sacramento page has that district's rules.

Before the Inspector Arrives

• List the work you plan, room by room, so sampling matches what will actually be disturbed.
• Clear access to the attic hatch, the crawlspace door, the furnace and any closets where pipes or ducts are visible.
• Do not scrape off loose pieces to "help"; a sample taken wet and patched releases far less than a homeowner pulling at a material dry.
• Keep the report. A later buyer, a contractor quoting acoustic ceiling removal or old floor tile removal, or the building department may ask for it.

How long does it take? Sampling a house usually takes a few hours. Lab turnaround is typically a few business days, and faster for a rush fee; the timing is on your estimate.

Questions About This Work