R 13 insulation will grow mold fyi. It doesn't mold in the average wall because of lack of humidity being trapped, the walls do breathe. Lol. Here's a pic for you. Add water and you'll get this. Lol.
View attachment 19048
Mold, bugs, birds, all of the above in the pic.
See the white and black mold on the insulation paper, and in the fiberglass. The fiberglass doesn't mold, but mold will grow on it if given moisture to do so. It will feed on the paper and the other organic stuff on, and in the fiberglass/rock wool insulation.
View attachment 19049
stupid bold text started and won't turn off. Lol.
these are pics of a small water leak we repaired. Lol, it wasn't small at all.
this repair was a $20,000 repair job.
all rotten. Had to lift the house, see my beam, and rebuild the entire lower corner, including adding a new foundation. View attachment 19050View attachment 19051
Needless to say, lol, mold will grow on most anything if given a chance.