Putting Up A Moisture Barrier Roof

Sloping the soil away from your home at about 1 2 in.

Putting up a moisture barrier roof.

That reduction of air and moisture infiltration can then help improve roof longevity. 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. Cover the dirt crawlspace with a plastic moisture polyethylene vapor barrier. If you are not sure if you need insulation in your walls follow along with this flow chart.

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. Per foot is usually the best thing you can do to reduce crawlspace moisture. Not every wall does. Consult building inspection offices for local recommendations.

Overlap any seams and tape them. Up the wall and fasten it there. And bring the plastic about 6 in. A roof design that includes an adhered roof membrane with multiple layers of insulation with board joints offset and staggered over a vapor retarder air barrier helps lower the risk that air and the moisture it carries will infiltrate the roof system.