I am renovating some rooms in the basement of my 70s house. Since the exterior walls are insulated and wooden studs were used directly against the exterior wall, I expected moisture and possibly mold in the walls. However, after making several larger holes in the walls, I can confirm that it is completely dry and in perfect condition.
When I removed the baseboards, I discovered mold on the inside of one baseboard (no issues behind other baseboards). The baseboard was on a brick interior wall in the middle of the house. I have measured the moisture content in the baseboard and it is 12%, which is good. There is no smell from the baseboard, the wall, or the floor as far as I can tell.
I know there was a major water damage incident in the house about 15-20 years ago. My thought is that this part of the basement wasn't adequately dried before reconstruction began, causing mold to start growing but that it has stopped now that it has dried out.
What do you think? Is everything okay or should I do something more?