I cut out and was going to repair a piece of drywall in the closet located behind the stove and ftx range hood.
When I saw the plywood behind the drywall (the plywood was probably put there to attach the ftx), it had black spots on it. Is it mold? I didn't smell anything and the moisture content was around 11%.
It felt a bit cold and like there was a kind of dried-up sticky residue on the surface.
I don't have any water pipes there, so it's hard to see where moisture would come from…
