Vapor Barrier On Concrete Walls In Basement

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

Vapor barrier on concrete walls in basement.

A vapor barrier is also helpful to keeping a basement insulated and warm. Polyurethane sheeting is a typical vapor barrier that contractors use to prevent moisture from penetrating the walls of a basement. 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. No vb is perfect.

So there is enough gap for air to flow. Only one vapor barrier maximum in the wall. Of foam against the wall this should not be a problem in your climate. 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.

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 water vapor can come through the concrete from the soil or from indoor air that comes in contact with the concrete. Vapor barriers are used because while fresh concrete is poured wet it s not supposed to stay that way. With fiber insulation and a vapor barrier moisture can get trapped in the insulation leading to moldy insulation and decay in the wood framing.

It needs to dry and then stay dryto avoid flooring problems. Vapor barrier against basement walls on september 8 2020 by amik basement waterproofing wall vapor if our sauna walls could talk insulate basement finishing how to finish mold growth under fibergl insulation basement insulation retrofits fine. The construction of the wall for instance is vital to the use of a vapor barrier. You should then use fiberglass insulation that has a vapor barrier between the studs with the vapor barrier facing in toward the living space.

When the mold grows it will spread to everything around it studs drywall etc. If you have more than one barrier in the thickness of the wall you will trap moisture in the middle. Ok people for the 957th time. 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.

It s not rocket science. Most jurisdictions require a 4 mil plastic sheet vapor barrier for basement walls against concrete.