Use special sealing tape to join sheets if polyethylene sheets are being used.
Block wall vapor barrier.
Required tools for this polyethylene vapor barrier project.
Whether or not you need a vapor retarder hinges on three main factors.
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.
Complete air blockage is essential to provide a satisfactory moisture barrier and will also maximize the wall s energy efficiency.
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.
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.
A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter.
How to glue a vapor barrier to a cement block wall.
After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one.
Building codes may require different details for termite control in your region.
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 every wall does.
By nature vapor travels from areas of higher concentrations to lower.