Block Wall Vapor Barrier

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. Cap the interior of the foundation wall with a 6 mil layer of plastic and galvanized flashing both to block moisture and to serve as a termite barrier. Not to be confused with a vapor barrier which is placed on the warm side of the wall just in front of the insulation and behind the drywall a moisture barrier goes against the basement wall.

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When a vapor barrier is on the side of a wall where the dry air is i e outside in winter or inside in summer moisture problems can occur.

Block wall vapor barrier.

Seal all wall cracks and holes in the wall being vapor proofed to block air gaps. There is no sure solution for termites. Since warmer air has more moisture vapor will move to. Not every wall does.

A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Required tools for this polyethylene vapor barrier project. By nature vapor travels from areas of higher concentrations to lower.

Use special sealing tape to join sheets if polyethylene sheets are being used. How to glue a vapor barrier to a cement block wall. Whether or not you need a vapor retarder hinges on three main factors. Complete air blockage is essential to provide a satisfactory moisture barrier and will also maximize the wall s energy efficiency.

Building codes may require different details for termite control in your region.

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