Putting Up A Moisture Barrier Roof

If you do not have a vapor barrier on the underside of your roof steel you should have an one inch layer of closed cell spray foam insulation applied to it otherwise it will probably rain in your attic.

Putting up a moisture barrier roof. Make sure to adequately ventilate the attic area above the insulation. Sloping the soil away from your home at about 1 2 in. Per foot is usually the best thing you can do to reduce crawlspace moisture. And bring the plastic about 6 in.

After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Consult building inspection offices for local recommendations. That reduction of air and moisture infiltration can then help improve roof longevity. Your first job after the studs are in place is to fill those walls with insulation.

Up the wall and fasten it there. Overlap any seams and tape them. Cover the dirt crawlspace with a plastic moisture polyethylene vapor barrier. In very cold climates the use of polyethylene plastic vapor barriers between insulation and interior wallboard may be beneficial provided all air gaps into any wall and ceiling cavities are also blocked.