Crawl Space Floor Joist Insulation

Floor insulation for moderate climes popular reads.

Crawl space floor joist insulation.

If your space has them avoid adding insulation to the crawl space walls. Instead install fiberglass batting between the joist bays which are the spaces between each set of floor joists. 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. In moderate or dry climates without the threat of sustained subfreezing temperatures insulation between floor joists makes sense.

However the insulation needs to be treated with a fire retardant. While this method does work in the very short term moisture eventually builds in the crawl space and grows on this highly porous surface. Crawl space insulation basics. Insulating and air sealing this perimeter zone is important because it s a major source of air infiltration and conductive heat loss.

Stapling fiberglass batts between joists to the underside of your home s floor presents a number of problems. Don t compress the insulation as it requires its loft in order to maintain its rated r value. It is important to secure insulation and cover it with a vapor barrier in order to prevent moisture and the mold that often follows close behind. Silverglo rigid foam insulation won t absorb water or support mold growth and does not allow air infiltration making it the perfect insulation product for use on crawl space walls.