Floor Joist Insulation Vapor Barrier

If both floors of the house are heated use unfaced insulation.

Floor joist insulation vapor barrier.

Facing up towards the floor above or facing down towards the crawl space or basement floor. Insulation provides a barrier between vapor and the structure. Install the insulation between the joists with the vapor barrier. This 1 4 to 5 16 thick insulation provides superior protection against radiant heat transfer and also provides an effective vapor barrier preventing condensation which can cause mold.

Always install batt insulation between the joists with the paper facing up against the. Check between floor joists if vented and check perimeter walls if unvented. Ecofoil floor joist insulation is constructed of a double layer of polyethylene bubble insulation bonded to two radiant barrier metalized sheets. Second i have foundation vent all around the house should the remain unblock or do the need.

Check rim joists and unfinished basement walls and compare depth with an r value map and chart for your area. If your house is elevated and the crawlspace is under that elevation so as to be exposed to the outdoor air then you are fine. Install the insulation with the vapor barrier facing up toward the heated living area of the house. That vapor barrier is laid directly on the dirt and the seams are overlapped at least 12 inches.

This article discusses the proper location and placement of moisture barriers or vapor barriers in crawl spaces to crawl space moisture.