Just a quick one here. We pulled up the floor tiles in the basement bathroom to discover that the toilet had been leaking and had rotted the plywood sub floor. This probably due to improper installation (a safe bet considering other work that had been completed) and a toilet shouldn’t leak after 5 years. We pulled out the rotten floor to replace it and discovered that when the waste plumbing had been put in place they hadn’t bothered to concrete back in the floor.
This does nothing to help and damp issues! A couple of bags of concrete and we were done.