Asbestos Clearance Air Testing in Columbia, SC
Clearance testing is the air sample taken inside the containment after the work is done, and it is the only thing that proves a space is safe to go back into. If an abatement quote you have been given does not include it, that price is not comparable to one that does. Call (803) 859-4938.
What clearance testing actually proves
Removal is not finished when the material is out of the room. It is finished when the air inside the sealed containment reads below the clearance threshold, sampled with the negative air still running and aggressive methods used to lift settled fibre back into suspension.
The order matters. A sample taken after the containment has been dismantled proves nothing, because the fibre of interest has already been diluted into the rest of the building. Any crew offering to test after they have packed up is offering you a piece of paper rather than a result.
PCM or TEM, and when each is used
PCM — phase contrast microscopy — counts fibres and is the standard, fast, economical clearance method for most residential work. It cannot distinguish an asbestos fibre from a fibreglass one, which is fine when the only fibrous material in the room was the one just removed.
TEM identifies the fibre and detects far smaller ones. It costs more and takes longer, and it is the right method on friable material, in schools and public buildings, where PCM returns a borderline count, and any time the result has to withstand challenge. We tell you which your job needs rather than defaulting to the cheaper one.
Book it with the abatement, not afterwards
The crew cannot leave until clearance passes, so the sample and the laboratory turnaround sit directly on the critical path of your project. Rush turnaround exists and is worth paying for when a move-in date or a handover is fixed.
Sample count follows the number of separate containment areas, not the size of the property — which is why a two-room job can cost the same to clear as a one-room job of twice the area. The rate sits on the cost page.
Independent clearance on somebody else's work
We take clearance samples on jobs we did not carry out, and we are asked to fairly often — by property owners who want confirmation before they accept the work, and by buyers whose seller has had abatement done. Ideally we sample before the other contractor's containment comes down, so tell us where the job is up to when you call.
On larger and occupied buildings, monitoring also runs during the work: perimeter samples outside the containment showing the enclosure is holding. On a commercial project that record is part of what gets handed over at the end — see commercial asbestos abatement.
Frequently asked questions
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How much does clearance air testing cost?
Priced per test day, with sample count following the number of containment areas rather than the size of the property. TEM analysis costs more than PCM. See the cost page.
Is clearance testing required?
For regulated work above threshold and in public buildings, yes. On a small owner-occupied job it is sometimes optional — but it is the only evidence the space is clean, so we do not recommend skipping it.
How fast are the results?
PCM can often be read the same working day, which is why it is the standard clearance method. TEM is a laboratory analysis and takes longer; rush is available.
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Can you test work another contractor did?
Yes. Ideally we sample before their containment comes down — tell us where the job is up to when you call.
What happens if it fails?
Containment stays up, the area is re-cleaned and it is re-sampled. On a job we carried out that is at our cost, which is exactly why the incentive to clean properly the first time sits with the crew.
Ready to book clearance testing?
Free on-site quote. No obligation. We tell you on the phone what it is likely to cost before anyone comes out.