The science of moisture movement.
New siding vapor barrier.
The process is a little more involved than buying a roll of housewrap at the lumberyard and stapling it in place over the sheathing.
Start your siding project housewrap and your siding.
We describe the requirements for house wrap or vapor or moisture barriers beneath vinyl siding and cite u s.
Unlike asphalt felt or housewrap liquid applied barriers are rolled or sprayed on to form a continuous seam free coating that is waterproof but vapor permeable.
Housewraps and vapor barriers are usually addressed in local building codes in fact many places require some kind of weather resistant barrier so a professional contractor can also make sure that your home is up to code.
A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter.
Canadian codes sources.
Preventing the inward flow of moisture through steel siding while still allowing the outward transfer of moisture trapped in a wall system requires a permeable wrb like barricade building wrap.
The process also helps form an effective air barrier.
Thus installing vapor barriers on wall surfaces must.
In addition to vapor permeability barricade building wrap provides water and air resistance uv resistance tear strength and temperature resistance.
The page top photograph shows that a lot of water more than you might guess may be running over the surface of.
Whether or not you need a vapor retarder hinges on three main factors your climate your home and the location of the wall you re insulating.