A wet spot appears in the middle of my wood floor whenever it rains. I've recently replaced the roof but the spot continues.
Yesterday, my chimney guy went under the crawlspace and said that the spot is mold that "activates" whenever it rains due to the humidity and I need to rip out the entire hardwood and subfloor. He wasn't trying to sell me this service as he doesn't do this.
Is it possible that the mold would "activate" and look wet due to humidity? The chimney guy said that there are no "trails" leading to the wet spot and that there is nothing wetting the floor from the underside. This is an old 1870's house that I just purchased. He said that the floor must have been saturated a long time ago and the mold started at that time. He said that the mold is in small areas and looks white and fluffy kinda like the freezer burn you see on ice cream that stays in the freezer too long.
Any help would be appreciated as I prepare to remove all of the the floor.
Thanks, Gus