Water Vapor Barrier Paint

Is more of a solution for walls rather than ceilings to prevent the indoor vapour drive during hot humid weather.

Water vapor barrier paint.

Basically any material rated at less than 1 perm is considered a vapor barrier retarder. The company zinsser makes a shellac based white primer called bin that is primarially used for hiding difficult stains but it too rates in at less than 1 perm and this company depending who is working in their labeling department this month occasionally identifies it as a vapour barrier paint. Moisture vapor barrier primer finish interior latex is a coating designed to reduce the loss of moisture through walls and ceilings. It combines a primer and finish in a single fast drying coat and is specially formulated for manufactured housing facilities.

In the case of water vapor you will want to consider installing a vapor barrier. Fluid applied air water resistive barrier and water vapor barrier vb is a fluid applied air and water resistive barrier that stops air and water leakage in cavity wall masonry veneer construction as well as in stucco eifs and most other building wall assemblies. Vapour barrier paint or vapor barrier paint in the u s. Vapor barrier paints can be an effective option for existing homes in colder climates.

Water vapor barrier paint is often applied to drywall walls and ceilings in attics where warm air tends to rise. If the perm rating of the paint is not indicated on the label find the paint formula. A perm rating is a standard measure of the water vapor permeability of a material. It is common to use plastic sheeting as a basement vapor barrier but waterproof paint will work just as well.

One common set of units is g m day or g. Technically many of these materials are only vapor retarders as they have varying degrees of permeability. Materials have a moisture vapor transmission rate that is established by standard test methods. Available at distributors nationwide.

The paint formula usually indicates the percent of pigment. A vapor barrier is any material used for damp proofing typically a plastic or foil sheet that resists diffusion of moisture through the wall floor ceiling or roof assemblies of buildings to prevent interstitial condensation and of packaging. 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. The reason as you may have read is that when there is a vapour barrier in homes in hot humid climates that rely on air conditioning for human comfort that vapour barrier is effectively on the wrong side in the cooling season.

The higher the number the more readily water vapor can diffuse through the material.