Spray Foam Insulation Crawl Space Floor

Closed cell spray foam has a higher insulation value.

Spray foam insulation crawl space floor. A close up of spray foam installed along the band boards. Closed cell spray foam has a perm rating of 2 6 at a thickness of 1. This type of insulation has a fairly high r value at 6 0 per inch. Instead install fiberglass batting between the joist bays which are the spaces between each set of floor joists.

Because open cell spray foam does not create a vapor barrier as it s installed it is inappropriate for use in a crawl space environment. Spray foam is the other type of insulation for the crawl space. In this video home renovation brothers dave and rich demonstrate how to insulate a crawl space. 10 2020 8 55 a m.

This type of insulation allows for conditioned air to be introduced into the crawl space. In this instance we focused on foil faced r 13 insulation on. 7 reasons you should use spray foam insulation in your crawl space spray foam insulation gets into even the smallest cracks which thoroughly blocks air flow from the outside. My spray foam contractor suggested removing the bat insulation in the floor joists after the crawl space was encapsulated.

Open cell spray foam insulation can expand up to 100 times its original size to fill every nook and cranny creating an air barrier that seals an area stopping air movement. Spray foam is a good moisture barrier with a low perm rating false. Don t compress the insulation as it requires its loft in order to maintain its rated r value. About r 6 per in as compared to r 3 7 per in.

That open cell spray foam provides. This picture was taken by an acculevel crew member after the crawl space repairs were completed. This type of crawl space also allows insulation with an r value of 19 installed in the floor joist if the crawl space and has a permanently installed dehumidifier. If your space has them avoid adding insulation to the crawl space walls.