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. Xps foam extruded polystyrene before building the interior walls to create a thermal breakvapor barrier.
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I live in massachusetts and im finishing 34 of my basement.
Vapor barrier basement walls. We can summarize the vapor barrier issue like this. Dedicated vapor barriers have no place in a basement wall. The standard installation of a plastic vapor barrier is between the studs and the drywall but there are some exceptions to this.
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 and behind the insulation and framing. On the exterior concrete walls i glued 2 in. If the basement wall is insulated on the outside then the vapor barrier is superfluous.
Heres lots of supporting evidence since this perspective appears to be controversial. Vapor barriers when to use them when to not. 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 science layer.
The best option for insulating a basement is to use spray foam insulation. In exterior walls that are below grade like basement walls plastic should not be used at all. 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.
A capillary break and vapor barrier should be located under concrete basement floor slabs. Should i put vapor barrier on interior basement wall. Hi mike building codes usually require a vapor barrier 4 mil plastic sheeting on exterior basement walls if the framing is attached to masonry or concrete surfaces or if the wood framing butts up against the outer basement walls.
Otherwise is it dangerous as it will trap moisture against a moisture sensitive element as i indicated. 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. Basement vapor barrier and insulation.
Weve written several articles about basement insulation and a cost effective approach to basement insulation using foam board and fiberglass insulation. Since 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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