Asbestos Removal
Old steam and hot-water heating systems are the single most common place asbestos turns up in a Pittsburgh basement. Pipes were wrapped in corrugated paper-like insulation, often called aircell, or in chalky white magnesia sections, and the elbows and joints were packed with a hand-applied plaster-like mud. Boilers were jacketed the same way. Much of it has been painted over, taped or partly torn away over the decades. Removal means sealing the basement off, wetting the insulation, cutting it away in sections or stripping it inside glove bags, and bagging it for disposal.
Walk into the basement of a Pittsburgh house built before the war and look up. The steam or hot-water mains running along the joists are often wrapped in one of a few materials. Corrugated aircell looks like layered grey-white cardboard. Magnesia block is chalky, white and segmented, usually held on with canvas or metal bands. The elbows, tees and valves are often packed with a hand-trowelled cement that looks like dried plaster. Boilers from the same era were jacketed in blocks or blankets and skim-coated. Any of these can contain asbestos, and in older systems many do.
Pipe lagging is classed as friable: once it is damaged, it crumbles into fibres under hand pressure. Insulation that is wrapped, painted and intact is not releasing much. Insulation with torn jackets, exposed edges, or debris on the floor underneath it is. Basements that have flooded, been used as workshops, or had plumbers cut through them over the years are where we most often find it damaged. The fact that a run has been taped over by a previous owner usually means it was already coming apart.
For a short section, a glove bag can do the job: a sealed plastic bag fitted around the pipe with built-in gloves, so the insulation is wetted, cut and dropped into the bag without ever being open to the room. For longer runs or a boiler, the basement is enclosed in plastic sheeting, sealed at doors, windows and floor drains, and held under negative pressure with a HEPA-filtered air machine exhausting outside. The insulation is soaked, cut away in sections and double-bagged. Bare pipe is wiped down and sealed with an encapsulant, and the containment stays up until a clearance air test passes.
The common trigger for this job is a new boiler or furnace. The heating contractor should not be cutting pipe that still has asbestos on it, so removal is scheduled first and the installer follows. If the old system is staying and the insulation is intact, repair and encapsulation may be the better call. Either way, the starting point is a lab result for each material, because the straight-run wrap and the fitting cement are often different products.
How long does it take? A few runs of basement pipe are usually a single day. A full boiler room with jacketed boiler and long runs can take two or three.
These usually come up in the same conversation:
Samples of the suspect material, analysed by a lab. You cannot tell asbestos by looking, and nobody should quote removal before the result is in.
Learn More →Sometimes the right answer is not removal. Intact material can be sealed, wrapped or enclosed so it stays put, for a fraction of the disruption.
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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