I'm residing my house and have come across a bit of an issue.
I already have a thread to follow my progress new hardi siding and windows - what have I started? aargh!
so far, as I've been pulling of the old aluminum siding, my plywood sheathing has been dry and in great condition, until today.
You can see in the lower right the plywood is a different colour. It was a bit wet and has a nice musty smell. Behind this wall is the laundry room. I think the problem is caused by an improperly installed dryer vent. The vent tube didn't go right through the wall but instead only entered the wall past the drywall. The exterior had a regular vent hole so over the years (10+) the warm wet dryer air was in direct contact with the fibreglass insullation.
The plywood is discoloured but appears to be in reasonable shape.
Do I need to cut out the sheathing and reinsullate? or do I let it dry out, install the vent properly, then paint the ply with a Kilz type paint?