Where Does the Paper Facing of Batt Insulation Go? Posted by Allison Bailes on February 14, 2013. 19 Comments Readwrite comments. Plastic vapor barriers really are vapor barriers when things get wet. Not so asphalt saturated kraft paper. Finding the Source of a Basement Water Problem. My New Project: A 1961 House With HomePerformance. Where does the Vapor barrier go in Basement? vapor barrier drywall I have had a questio posted for you on the electrical forum and was wondering if you could answer it. If you put a polyethylene vapor barrier behind a drywallcovered stud framed wall, then the answer is that water that condenses on the poly will fall onto the wood sill plate, growing mold and eventually rotting it out. Dedicated vapor barriers have no place in a basement wall. I originally had planned to put a 3 mil vapor barrier directly against the basement walls (painted concrete) and then frame while leaving a gap between the frame and basement wall and insulate with fiberglass batts. The community has grown to over 850, 000 members and has reviewed over 58, 000 online. Apr 24, 2014A vapor barrier's job is to keep water vapor in humid air from diffusing through one side of a wall and finding a cool surface inside the wall. When a vapor barrier is on the side of a wall where the dry air is (i. , outside in winter or inside in summer), moisture problems can occur. This will give you two vapor barriers, one before and one after the stud wall framing. The other option is to set the 24 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. Also, be sure to use treated lumber for the bottom plate on the wall framing. Related To: A basement vapor or moisture barrier is installed during the new construction of a home or the remodeling of a basement. Polyurethane sheeting is a typical vapor barrier that contractors use to prevent moisture from penetrating the walls of a basement. The material is stapled to the frame of a basement wall before it is finished Dec 02, 2008This will eliminate the need for the vapor barrier preventing the warmer moist air from the living space from contacting the cold foundation wall surface. Then put up your framing studs and finish as desired. and if you wish to add batt insulation into the stud bays. Mar 31, 2016Before framing the walls of your basement, install a moisture barrier to prevent water and moisture from entering the wall cavity. Here are your three best options. Not to be confused with a vapor barrierwhich 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 behind the insulation and framing. In warm climates, the barrier should point to the outside of the house, blocking the vapor from the humid outside air that may seep into the walls or ceilings. In cold climates, the opposite is true. The air is usually warmer inside the house, so condensation can build. May 03, 2011The vapor barrier should go directly underneath of the concrete slab. A sand layer should NOT be installed between the VB and the concrete. Millions of cubic yards of concrete are poured directly on top of fluted steel (an obvious vapor impermeable material) floor decks every year. Which way does the insulation vapor barrier or kraft paper go over a basement or crawl space: facing up (towards the floor above) or facing down (towards the crawl space or basement floor)? This article discusses the proper location and placement of moisture barriers or vapor barriers in crawl spaces to crawl space moisture.