S
Susanna
Yeah guess I will have to find a plumber. I am very wary as I am afraid of being ripped off lolThe green boards are sound proofing and insulation and act to help take out undulations in the floor too. Topps tiles sold them, made from paper so they'd have soaked up even the tiniest of leaks or damp over time. Probably rotting so might have caused the smell.
Might be worth finding the source of the moisture though!