I wonder why it would show up past water leaks in the walls..?.
Unless, it was sheet-rock and some of the 'rock' got washed away (into the basement)
and now it's just thin cardboard over the water tunnels??
Humm, if it's mostly little air tunnels, maybe they would have a higher R-factor than
plain old solid sheet-rock?? Maybe those leaking areas were warmer than the undamaged walls?
Or, maybe it was the insulation between the studs that got washed down to the bottom..?.
|