Floor Joist Insulation Vapor Barrier

Install the insulation with the vapor barrier facing up toward the heated living area of the house.

Floor joist insulation 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. 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. First insulation will be going between the floor joist i only filled gaps with foam.

Ecofoil floor joist insulation is constructed of a double layer of polyethylene bubble insulation bonded to two radiant barrier metalized sheets. That vapor barrier is laid directly on the dirt and the seams are overlapped at least 12 inches. Facing up towards the floor above or facing down towards the crawl space or basement floor. If both floors of the house are heated use unfaced insulation.

Ground should be covered with a 6 mil polyethylene sheet. Insulation provides a barrier between vapor and the structure. Always install batt insulation between the joists with the paper facing up against the. 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.

Which way does the insulation vapor barrier or kraft paper go over a basement or crawl space.