I have a section of drywall, interior wall of the laundry room, that has me completely dumbfounded. There is no sign of water damage, leakage, etc. but for some reason during the hot day it reads very high moisture on the wall setting of the pinless moisture meter. During the early morning hours, when it’s much cooler, before the sun gets hot, it reads very low and back to 0% in most of the wall.
I have a thermal imaging inspector coming, but he can’t come until the 10th.
My guess is missing an air seal to the vented attic. Hot air is coming in and causing condensation on the cold side of the drywall.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part