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I have been asking around, and a valid reason could be that the floor concrete was quickly poored, and not finished smooth. Then this stuff was used to level, and give a smooth finish which was also thermal barrier. There is what appears to be a course fibre glass looking mat was laid onto...

I have repositioned a down stairs toilet and during the excavation i had to got through this 20 mm black material. I am not sure of its purpose other than it could be to match up different floor levels as this is in an extended part of the house. i don't think it is for damp as there is a...