In a storage area in my basement, the ceiling is not finished. I notice recently that the wood joists for the main floor are covered in these patches of black. Is this likely mold or something else (burned wood?). Is there anything to do or check, or should I just get a mold detection kit?
The house is only a few years old. This is an unfinished storage area and it is not typically that moist in there. I put in some desiccants and they've barely absorbed any moisture, but I can't remember if the wood liked like this when I moved in. I don't really see anything on any of the exposed wall framing or OSB subfloor that looks like this in this unfinished area either.