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asbestos insulation in fireplace

Posted by Greg on December 3rd, 2000 01:42 PM

I'm installing a Direct Vent Gas fireplace in the opening to a old capped wood fireplace and I need to enlarge the opening. The house was built during 1946 in Toronto, Canada. After removing some fire brick and metal I came across a course of 4 inch black colour block that runs along the top of the main opening. The block has a texture of volcanic rock (lots of holes).The block is also not soid it is shaped like open foundation block. There are no visiable fibers. Has anyone ever seen this type of block used in 1940s' fireplace construction. Did any of it contain asbestos??

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