Vapor Barrier Framing A Basement Wall Against Concrete

I suspect this is why several in this thread recommend strongly against any vapor barrier on basement walls. The other option is to set the 2 4 wall framing in 4 from the masonry or concrete basement walls and use just the vapor barrier on the insulation facing toward the living space. A concrete wall is poreice tiny wholes spelling and dirt is damp so teh dampness of the dirt by definition moves through the concrete.

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Before framing the walls of your basement install a moisture barrier to prevent water and moisture from entering the wall cavity.

Vapor barrier framing a basement wall against concrete.

Here are three different types explained. Most jurisdictions require a 4 mil plastic sheet vapor barrier for basement walls against concrete. The main concerns are condensation and drying potential. Or you can leave a 4 inch gap between the studs and concrete wall and probably get away with it.

I would think that trapping any of this moisture behind a finished basement wall would be bad. That is if the studs are going to touch the concrete wall. 1 on the interior wall between the heated and unheated portion of the basement i would not use with a vapor barrier. Also be sure to use treated lumber for the bottom plate on the wall framing.

If you have a framed wall that is adjacent to a concrete foundation wall where the vapor barrier is next to the drywall in front of the studs the fiberglass insulation gets wet and becomes a breeding ground for mold. The construction of the wall for instance is vital to the use of a vapor barrier. When the mold grows it will spread to. In winter the dew point of the interior air is typically about 50 f assuming an air temperature of 70 f and a relative humidity of 50.

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