Floor Joist Insulation Vapor Barrier

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

Floor joist insulation vapor barrier.

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. Check between floor joists if vented and check perimeter walls if unvented. 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. That vapor barrier is laid directly on the dirt and the seams are overlapped at least 12 inches.

Install the insulation between the joists with the vapor barrier. Insulation provides a barrier between vapor and the structure. First insulation will be going between the floor joist i only filled gaps with foam. If both floors of the house are heated use unfaced insulation.

Check rim joists and unfinished basement walls and compare depth with an r value map and chart for your area. Ground should be covered with a 6 mil polyethylene sheet. Second i have foundation vent all around the house should the remain unblock or do the need. Ecofoil floor joist insulation is constructed of a double layer of polyethylene bubble insulation bonded to two radiant barrier metalized sheets.

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