Vapor Barrier On Concrete Walls In Basement

The material is stapled to the frame of a basement wall before it is finished with plaster or drywall.

Vapor barrier on concrete walls in basement.

Vapor barriers are used because while fresh concrete is poured wet it s not supposed to stay that way. Of foam against the wall this should not be a problem in your climate. A vapor barrier is also helpful to keeping a basement insulated and warm. Or you can leave a 4 inch gap between the studs and concrete wall and probably get away with it.

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. Polyurethane sheeting is a typical vapor barrier that contractors use to prevent moisture from penetrating the walls of a basement. That is if the studs are going to touch the concrete wall. So there is enough gap for air to flow.

If you have more than one barrier in the thickness of the wall you will trap moisture in the middle. The construction of the wall for instance is vital to the use of a vapor barrier. When the mold grows it will spread to everything around it studs drywall etc. It s not rocket science.

You should then use fiberglass insulation that has a vapor barrier between the studs with the vapor barrier facing in toward the living space. No vb is perfect. The water vapor can come through the concrete from the soil or from indoor air that comes in contact with the concrete. For a basement that vapor barrier should be the waterproof membrane or coating on the outside of the concrete wall.

It needs to dry and then stay dryto avoid flooring problems. 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. If you ve ever had a problem with a basement floor or any concrete floor you know the kind of damage that too much moisture can cause. Only one vapor barrier maximum in the wall.

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