I live in a house that had an addition built on many years ago. It's in pretty shabby shape, but we repainted part, put a new floor in, and now it's livable--it's now our bedroom. Problem is, there's a weird smell in that part of the house, which happens to contain the laundry room and a bathroom that we don't really use. Both these rooms are in great need of work: they have plywood walls where the paint is peeling, and the wood looks like it's been wet at some point. .. probably moldy? The smell is kind of old and musty, a little gassy, a little bit like rot, but not a dead animal. Ideas? Solutions? It's not a hugely strong smell, but it bothers me, and it's noticeable. The shower isn't being used, but we've run water in the drain a couple times to stop sewer gasses from coming up, and it hasn't seemed to help--does one need to do that a lot to take care of sewer gasses? Could it be rotting plywood?
Thanks for any help