Drywall Vapor Barrier Paint

If a vapor barrier is damaged during a drywall installation or repair it may be patched with housewrap tape but small holes only marginally impact effectiveness.

Drywall vapor barrier paint. Vapour barrier paint or vapor barrier paint in the us. Meanwhile air leakage through a 1 square inch hole in a sheet of drywall allows 30 quarts of water vapor to pass through the drywall under the same conditions. Vapor barriers when to use them when to not. It combines a primer and finish in a single fast drying coat and is specially formulated for manufactured housing facilities.

When patching drywall on an exterior wall its almost impossible not to damage the vapor barrier. Vapor barriers are often installed in the form of plastic sheets or foil sheet. Learn how the work and why theyre essential. Without water vapor barrier paint the warm air would release its water inside of the walls and ceilings where the water would saturate the insulation and framing.

Im questioning whether or not it is actually the interior paint that is serving this purpose of the vapor barrier or retarder. If you are careful to seal around openings like light fixtures and ceiling fans and seal it well at the wall junction then your new layer of drywall can act as an air barrier. Moisture vapor barrier primerfinish interior latex is a coating designed to reduce the loss of moisture through walls and ceilings. Contemporary landscapers also use vapor barrier paints and coatings at the time of drywall repairs.

Water vapor barrier paint is often applied to drywall walls and ceilings in attics where warm air tends to rise. The permeance of unpainted drywall is very high generally between 20 and 90 so its not a vapor retarder at all. A vapor barrier is essentially refers to any building material that is used for creating a resistance against the passage of water vapor and moisture within the drywalls. Building and renovating homes in cold climates requires vapour barriers in some places.

On this special edition of the build show matt takes us on a guided tour through the ins and outs of vapor barriers from the studio building. In this area many use poly over studs and joistsrafters before installing drywall. With the help of gaskets and sealants gypsum board drywall is a very effective air barrier so long as the joints are sealed with drywall compound and tape. A third of a quart versus 30 quarts.

And since you already have the 4 mil poly vapor barrier i would just use a standard low voc paint.