Moisture buildup in vented crawl spaces
Why it happens here
Reservoir humidity moves through open crawl space vents and condenses on cold joists and subfloor. Fiberglass batts absorb that moisture and stop working. It is the number one issue we find in North Shore.
Our approach
We seal the vents, install a vapor barrier on the floor, and insulate the walls with foam board. Rim joists get closed-cell spray foam. This stops moisture at the source instead of trying to dry it out later.