Vapor barrier The phrase vapor barrier is often used to refer to any material, typically a plastic or foil sheet, that resists passage of moisture through
In order to stop the moisture from entering the home from the underslab area, either the first barrier or the last barrier must be completely impermeable. “You want to have that water vapor transmission rate, or permeability of the material, on the lower end at the first point of interacti...
Tough, 85-mil Polyguard Underseal® Underslab Membrane is a pre-concrete pour vapor barrier that is designed to stop radon and methane gas emitting from the soil below the foundation from entering a home. It also eliminates vapor and water transmission through the concrete slabs on grade, pr...
Viper® II under-slab vapor barriers offer superior protection against water vapor and soil gas threats.
However, other building science research indicates that it should be applied directly under the exterior finish and is sometimes itself the exterior finish. A combination air barrier/vapor diffusion retarder may be a better choice for this situation. Knowledgeable builders typically use vapor diffusion ...
What is the best arrangement and material to use as a vapor barrier under the floor slab? I have received contradictory advice from solar dealers regarding the placement of the vapor barrier - above and below the sub-slab insulation have both been recommended. - J.W., Gettysburg PA Our phot...
The bottom line:Treat below-grade walls the same as above-grade walls. Q.Are vapor barriers needed below slabs? What if the vapor barrier gets ripped when the concrete is placed? A.In a new home, it’s imperative to install a vapor barrier beneath an enclosed slab since ground moisture ...
drying inward. This can be a problem in any air-conditioned enclosure. This can be a problem in any below grade space. This can be a problem when there is also a vapor barrier on the exterior. This can be a problem where brick is installed over building paper and vapor permeable ...
Sub-slab vapor barrier.(Flooring)McCombe, Patrick
I'm in the process of putting together plans for a small boat ramp. From what I can tell from a state DNR fax, they recommend placing TWO layers of 4-mil vapor