Good day everyone, I have dead space between the house and the addition (garage) that only has an air inlet at the eave but never had a roof vent. I just ripped out and replaced all the decking and there was definitely mold on the underside of the sheathing in that area. It is roughly 14’ x 4’ or 56 ft2 at ceiling height to roof line.
Option 1: Install a roof vent, but I wonder if the 8" roof vent would be too big and create more issues?
Option 2: Make cut outs (covered by air flow grill) on the wall between the studs and let the garage roof vents do the work.