Years ago, when few homes had insulation in their outside walls, no one worried about vapor barriers ... but even most solid materials cannot block the moisture, which can easily pass through ...

Water vapor can move through many surfaces through a process called permeation. This is when vapor molecules (in this case, water vapor) can move through a porous material ... through the walls.

Batt insulation consists of a blanket constructed from fiberglass, cellulose, mineral wool, natural fibers or plastic. These materials can be ... system. Vapor barriers prevent water vapor from ...

“Diffusion can ... function of a vapor barrier is to retard the migration of water vapor. Specifying a vapor barrier's permeability and its proper location within the assembly are a function of ...

I have read that without a vapor barrier moisture can ... have had insulation blown in without incident, mostly because old houses are so leaky that there is little or no chance for water vapor ...

Insulated basements can add ... value and and functions as a moisture barrier in and of itself. But if you use fiberglass insulation batts, then a moisture barrier will prevent water and moisture ...

DEAR TIM: The crawl space under my 1910 home is just exposed dirt and leftover building materials ... vapor can escape into the crawl space. Once the vapor barrier is in place, you can add ...

Most insulation has paper backing. This is the vapor barrier. The idea is to keep warm moist air from contacting a cold surface condensing the water vapor ... More information can be found ...

The main advantage of this new product is its water vapor barrier ... at a high level. X-BARRIER™ is a transparent material and is metal-free so contents are visible. Functions such as Gelbo ...