Asbestos Removal
Asbestos cannot be identified by eye. Pipe wrap, floor tile, ceiling texture and siding that look identical can come back positive in one house and negative in the next, so every job starts with samples. An inspector wets the material, cuts a small piece from each suspect area, seals it and sends it to a lab, which reports whether asbestos is present and roughly how much. In an older Pittsburgh-area house that usually means several samples, because a basement can hold pipe lagging from the 1920s next to floor tile from the 1960s.
Two basement floors laid with the same grey nine-inch tile in the same decade can give opposite lab results, because manufacturers changed formulas, suppliers and adhesives constantly. Pipe wrap, ceiling texture and joint compound are the same. That is why nobody, however experienced, can tell you a material is or is not asbestos from a photo or a walk-through. What experience does tell an inspector is which materials to sample, and in a Pittsburgh house built before 1960 that list is usually long.
The inspector sprays the material with water to keep dust down, cuts a small piece out with hand tools, drops it into a sealed container and labels it with the room and the material. The spot is then sealed or patched so it does not keep shedding. Each different material gets its own sample, and large areas of one material may get more than one, because a single result does not speak for a product the inspector has not sampled. Allegheny County's rules call for bulk samples to be analysed by polarized light microscopy at a lab in EPA's quality-assurance programme, which is the standard method everywhere.
Results come back per sample: whether asbestos was detected, what type, and an estimated percentage. Under the federal definition, a material with more than one percent asbestos is treated as asbestos-containing. The report ties each result to a location, so you know that the boiler wrap is positive, the kitchen tile is negative and the black adhesive under it is positive, which is a common pattern. From there the decision is practical. Positive material that is intact and not in the way can often stay. Positive material that is damaged, or that a renovation is about to disturb, is where removal or encapsulation comes in.
The most expensive time to discover asbestos is halfway through a remodel, when a contractor has already broken into a ceiling or ripped up a floor and the house has to be cleaned as well as the material removed. Testing first costs a day and some lab time. For a gut renovation or teardown, a full pre-demolition survey covers every material the job will touch, and it is the document permit offices and regulators ask for on larger buildings.
How long does it take? Sampling a typical house takes an hour or two. Lab turnaround is usually a few business days, faster if a renovation or closing date is pressing.
These usually come up in the same conversation:
White corrugated pipe wrap, plaster-like elbow fittings and boiler lagging from old steam and hot-water heating systems, removed under containment.
Learn More →9-inch vinyl-asbestos tile and the black adhesive under it, removed before new flooring goes down, so nobody sands or grinds it later.
Learn More →An asbestos survey and removal ahead of a gut remodel, addition or teardown, so the permit is not held up and the crew is not cutting into it.
Learn More →Free · No obligation
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