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BISF Groundfloor concrete

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The groundfloor in my BISF house seems to have a black screed on top of the concrete screed. It smells like bitumen/tar but why has it been used and would it have asbestos in it. I assumed it was some sort of damp protection but I'm not sure.

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  • Its the black and white marley tiles that have been tested for asbestos only a small trace, and the tar is a DPC