Vapor Barrier Against Concrete Wall

Or you can leave a 4 inch gap between the studs and concrete wall and probably get away with it.

Vapor barrier against concrete wall.

Of foam against the wall this should not be a problem in your climate. It needs to dry and then stay dryto avoid flooring problems. The water vapor can come through the concrete from the soil or from indoor air that comes in contact with the concrete. A concrete vapor barrier is any material that prevents moisture from entering a concrete slab.

A vapor barrier against the concrete surface is generally recommended before wood framing or flooring materials are installed. Below grade walls and floor slabs transmit ground moisture through concrete walls or slabs. Lay a continuous layer of 1 4 inch foam gasket or similar moisture and air barrier on top of the concrete slab before applying sill plates. With fiber insulation and a vapor barrier moisture can get trapped in the insulation leading to moldy insulation and decay in the wood framing.

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. You should then use fiberglass insulation that has a vapor barrier between the studs with the vapor barrier facing in toward the living space. So there is enough gap for air to flow. Vapor barriers are used because while fresh concrete is poured wet it s not supposed to stay that way.

Crawl spaces benefit from a polyethylene moisture barrier placed directly over the exposed earth. 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. The gasket must be designed specifically for use with. Most jurisdictions require a 4 mil plastic sheet vapor barrier for basement walls against concrete.

That is if the studs are going to touch the concrete wall.