Insulate Hip Roof By Crawlspace

Jm comforttherm kraft faced and unfaced insulation are all possible products to use for this application.

Insulate hip roof by crawlspace.

Cut the insulation to fit the cinder block brick or whatever your foundation is made of. In a vented crawl space the underfloor should be insulated similar to how it is in ceilings. When you re using fiberglass batting insulation material run it about 6 inches or so onto the crawl space floor. The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall.

For extra insulation repeat the process so that you have a double layer of insulation board. Make sure they re as tall as your crawl space area and that they re installed tightly against each other use your caulk or foam sealant to seal the seams in between the boards. Cut pieces of insulation just large enough to fit along the rim joist the framing material into which all the floor joists are nailed. The best way to insulate a crawlspace would be to do it from the ground up and consider it just part of the conditioned space as you would with any basement.

This will limit the moisture that enters your crawlspace through brick or concrete cinderblocks. Install an air and vapor barrier over the floor and tape it to the insulation. With kraft faced insulation the facing is generally against the subfloor. Use caulk or foam sealant to seal the joint between the top of the crawl space wall and the sill.

This may be done before or after the subfloor has been installed.