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.

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 ...

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 ...

LIST the major factors that can impact water ... barriers must be carefully detailed to provide continuity and may or may not also function as vapor retarders. Vapor flow is generally one-dimensional ...

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 ...

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 ...

Underlayment can perform one or more of several functions ... amount of insulation. Impermeable or semi permeable underlayments, also called vapor barriers, are great for keeping water from ...

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 ...