Floor Joist Insulation Vapor Barrier

Facing up towards the floor above or facing down towards the crawl space or basement floor.

Floor joist insulation vapor barrier.

Which way does the insulation vapor barrier or kraft paper go over a basement or crawl space. Check rim joists and unfinished basement walls and compare depth with an r value map and chart for your area. This article discusses the proper location and placement of moisture barriers or vapor barriers in crawl spaces to crawl space moisture. 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.

If both floors of the house are heated use unfaced insulation. That vapor barrier is laid directly on the dirt and the seams are overlapped at least 12 inches. Insulation provides a barrier between vapor and the structure. 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. First insulation will be going between the floor joist i only filled gaps with foam. Install the insulation between the joists with the vapor barrier. Ecofoil floor joist insulation is constructed of a double layer of polyethylene bubble insulation bonded to two radiant barrier metalized sheets.

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