Vapor Barrier Basement Wall Framing

Experts suggest that installing these within basement walls leads to moldy basement insulation. To know if you need a vapor retarder ask yourself a few basic questions. Or you can leave a 4 inch gap between the studs and concrete wall and probably get away with it.

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Vapor barrier basement wall framing.

Dedicated vapor barriers are typically installed on the warm side of walls behind the drywall and right in front of the insulation. When the mold grows it will spread to everything around it studs drywall etc. So there is enough gap for air to flow. 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 material is stapled to the frame of a basement wall before it is finished with plaster or drywall. Not to be confused with a vapor barrier which 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. A vapor barrier is also helpful to keeping a basement insulated and warm. Basement remodeling ideas from tv.

Most jurisdictions require a 4 mil plastic sheet vapor barrier for basement walls against concrete. The water vapor can come through the concrete from the soil or from indoor air that comes in contact with the concrete. That is if the studs are going to touch the concrete wall. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter.

Of foam against the wall this should not be a problem in your climate. 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. In short basement wall systems should never have any polyethylene vapor barriers. With fiber insulation and a vapor barrier moisture can get trapped in the insulation leading to moldy insulation and decay in the wood framing.

Fiberglass insulation inside a bag hanging from the rim joist down along the foundation wall. Whether or not you need a vapor retarder hinges on three main factors your climate your home and the location of the wall you re insulating. Polyurethane sheeting is a typical vapor barrier that contractors use to prevent moisture from penetrating the walls of a basement. Stud wall filled with fiberglass insulation an inch or two away from the concrete wall.

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