I don't recall where I saw it, but there is a product (similar to door & window flash, but wider) that goes on the plywood, along with a primer. You would need to start the application down at the ... read more
You mentioned this room being over a crawl space. We have found that most spaces are incorrectly conditioned.....or should I say say, not conditioned at all. Insulation is typically installed within t ... read more