Vermiculite Testing in Montreal
If you do have vermiculite in your attic placed prior to 1990, you can probably assume that it is contaminated. Vermiculite is an interesting material made by taking small grains of special rocks and basically exploding them much like popcorn into light fluffy grains, a bit smaller than popped popcorn. It makes great insulation with the special property that it is virtually fireproof.
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Vermiculite is not a problem! Asbestos pollution of vermiculite is the problem. One mine in Libby Montana produced most of the world's supply of vermiculite for many years, up until 1984 when they stopped shipping their product called Zonolite. A few years later they went bankrupt because of US class action suits against them for the asbestos contamination.
Apparently it was known from the early 70's that there was some asbestos in the Zonolite, but by all safety standards, it was a very small quantity compared to the total volume of the insulation. It was only later that it was discovered that when long sitting Zonolite is moved around, the small asbestos fibres become airborne and it is that airborne concentration of asbestos that exceeds the safety norms and becomes a health hazard.
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