It is for a bathroom with a tiled shower. This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings and it is required by building codes when insulating most houses.
How To Install A Basement Vapor Barrier Hgtv
Any vapour that does get past the warm in winter vapour barrier can easily escape up through the insulation and out the top right through the brick.
Vapour barrier in basement. A vapor barrier reduces the movement of water vapor by diffusion. 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. The builder insulated the upper 4ft of the basement wall with a pink batt style insulation which is held to the wall with a vapor barrier.
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. Holes in the vapor barrier that allow humid air through may allow a lot more water vapor into an assembly than the vapor barrier is stopping. Is it ok to add this vapor barrier.
Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. 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. The basement is completely below grade with the exception of the top 12 or so.
In any case the vapor barrier must point to the warm side. Mold when basement vapor barriers are bad. The vapor barrier is sealed to the concrete wall at the bottom with some sort of seal and nailed directly to the concrete.
My basement wall is insulated with a 2 inches of styrofoam on the interior and i built a 24 wall and added roxul insulation. In addition you will never get a warm comfortable basement unless you insulate the entire wall. 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.
You will also notice in the graphic that there is a moisture barrier right against the concrete wall starting at ground level and going down under the wall then the vapour barrier all the way up on the warm in winter side of the insulation. I planned to install vapor barrier on top. Vapor barriers when to use them when to not.
Vapor barriers can be misguided when used as dictated by building codes in cement basement walls. So you could say that there is a second vapour barrier on this wall but it is specifically and carefully limited to the underground portion and a moisture escape route is left above it. I live in central ontario canada.
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