Exterior Wall Vapor Barrier Installation

The exterior face of the wall or floor cavity should remain permeable in order to allow dissipation of any moisture that does enter the wall cavity.

Exterior wall vapor barrier installation.

How did this project turn out. If the tub shares this exterior wall i would put vapor barrier behind it if you can as the plastic tub surround will not give you a vapor barrier i don t think. In any case the vapor barrier must point to the warm side. Water resistive barrier behind the exterior wall veneer.

A vapor barrier reduces the movement of water vapor by. The vapor barrier should be on the inside between the insulation and drywall. Accordance with the manufacturer s installation instructions. That way you can ensure your vapour barrier is installed properly on the exterior wall you can add insulation to the interior wall for better r value and you will have a cable chase between the two walls if needed for future reference.

This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings and it is required by building codes when insulating most houses. There is no need to vapor barrier the non exterior walls. In exterior walls that are below grade like basement walls. To be extra certain use a caulk gun to place caulk material around the tape to double seal the barrier.

If you have access it should be cheap. The standard installation of a plastic vapor barrier is between the studs and the drywall but there are some exceptions to this. I would build the additional 2x4 wall in front of your exterior wall if you have the room. Finish the wall within a month of installing the barrier to prevent damage to the surface and protect the vapor barrier.

Very hot and humid climates may benefit from an exterior vapor barrier that keeps outside humidity from penetrating into walls. Exterior wall envelope shall include flashing as described in. A vapor barrier s job is to keep water vapor in humid air from diffusing through one side of a wall and finding a cool surface inside the wall. Using other kinds of tape will compromise the waterproof seal and render the barrier useless.