Installing Vapour Barrier In Attic

The best approach for a vented attic in a cold climate is installing a layer of drywall with a good coat of latex paint the paint creates a semi permeable vapor barrier.

Installing vapour barrier in attic.

Adding a second vapor barrier could cause condensation to become trapped in the insulation between the two vapor barriers. As you work sweep your hand across the surface to push out air and keep the barrier flat. Most of the blanket insulation types have vapor barriers incorporated and can be very effective if installed properly. Gradually roll the barrier out and use your chosen method to secure it at regular intervals.

Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions. You will see on which side is the vapor barrier. Staple it into place. The inner surface in colder climates and the outer surface in hot humid climates.

Vapor barriers in attics should only be installed on one side of the insulation. The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below. If you are reluctant to use staples secure the barrier with duct tape instead. Never compress or fluff your insulation.

Since some leakage of moisture into the insulation in inevitable murphy s law you want it to be able to freely escape from the insulation into the attic. This means also the access hatch. Not be trapped inside.