Crawl Space Floor Joist Insulation

Instead install fiberglass batting between the joist bays which are the spaces between each set of floor joists.

Crawl space floor joist insulation.

In moderate or dry climates without the threat of sustained subfreezing temperatures insulation between floor joists makes sense. Don t compress the insulation as it requires its loft in order to maintain its rated r value. Stapling fiberglass batts between joists to the underside of your home s floor presents a number of problems. 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.

If your space has them avoid adding insulation to the crawl space walls. Floor insulation for moderate climes popular reads. If the crawl space is ventilated which is ideal because it aids in the elimination of moisture then fiberglass insulation can be easily installed under the subfloor between the floor joists. 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. Insulating and air sealing this perimeter zone is important because it s a major source of air infiltration and conductive heat loss. This type of insulation allows for conditioned air to be introduced into the crawl space. Where winter temperatures are extreme opt for insulating the walls and sealing off the crawl space entirely.