Insulation Crawl Space Floor Joists

Floor insulation for moderate climes popular reads.

Insulation crawl space floor joists.

Joist bays the open spaces between floor joists are prime hosts for insulation under specific circumstances. In moderate or dry climates without the threat of sustained subfreezing temperatures insulation between floor joists makes sense. 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. Cover the walls with insulation from the sill plate to the plastic covered dirt floor.

Department of energy recommends r 11 3 insulation under floors in warm climates and an r 25 6 to 8 in cold climates. Where winter temperatures are extreme opt for insulating the walls and sealing off the crawl space entirely. 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. In those days common building practice was to insulate the floor above the crawl space and to leave the crawl space s wall vents open so any moisture buildup would vent to the outside a.

The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall.