Plastic Vapor Barrier Basement

A capillary break and vapor barrier should be located under concrete basement floor slabs. Weve written several articles about basement insulation and a cost effective approach to basement insulation using foam board and fiberglass insulationsince writing those articles weve received quite a few questions about when to use a basement vapor barrier and when not to.

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I live in central ontario canada.

Plastic vapor barrier basement. We can summarize the vapor barrier issue like this. Is it ok to add this vapor barrier. Heres lots of supporting evidence since this perspective appears to be controversial.

On this special edition of the build show matt takes us on a guided tour through the ins and outs of vapor barriers from the studio building. Basement vapor barrier and insulation. Otherwise is it dangerous as it will trap moisture against a moisture sensitive element as i indicated.

Building vapor barriers are generally considered beneficial necessary and required for building code compliance so i realize that taking a poke at the status quo will lead to some hostility. It is for a bathroom with a tiled shower. A vapor barriers job is to keep water vapor in humid air from diffusing through one side of a wall and finding a cool surface inside the wall.

Vapor barriers when to use them when to not. My basement wall is insulated with a 2 inches of styrofoam on the interior and i built a 24 wall and added roxul insulation. So we thought it might be a good idea to clear up some of the confusion.

Crushed stone or coarse gravel acts as an effective capillary break and sheet polyethylene in direct contract with a concrete floor slab acts as an effective vapor barrier. In exterior walls that are below grade like basement walls. Not to be confused with a vapor barrierwhich is placed on the warm side of the wall just in front of the insulation and behind the drywall a moisture barrier goes against the basement wall.

Mold when basement vapor barriers are bad. The standard installation of a plastic vapor barrier is between the studs and the drywall but there are some exceptions to this. When a vapor barrier is on the side of a wall where the dry air is ie outside in winter or inside in summer moisture problems can occur.

I planned to install vapor barrier on top. If the basement wall is insulated on the outside then the vapor barrier is superfluous. Dedicated vapor barriers have no place in a basement wall.

Vapor barriers can be misguided when used as dictated by building codes in cement basement walls.

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