After you studded your walls against the foam board, did you add fiberglass insulation? I have been getting mixed results when researching, use paper backed, dont use paper back, use vapor barrier, use vapor retarder, dont use any vapor barrier or retarded with the xps foam boards. I am at a halt before I can start drywalling. Basement Vapor Barrier and Insulation. Weve written several articles about basement insulation and a cost effective approach to basement insulation using foam board and fiberglass insulation. Since writing those articles weve received quite a few questions about when to use a basement vapor barrier and when not to. So we thought it might be a good idea to clear up some of the confusion. The short answer is no, you generally do not want a vapor barrier on the walls of a finished basement. The place to control vapor migration is on the exterior of the basement wall, in the form of waterproofing or damproofing. On the interior, the best insulation to place against the concrete or block is rigid foam without any facing, such as foil or plastic sheeting. May 20, 2009In most basement wall situations, the foam plastic insulation material will need to be covered by a fireignition barrier. Halfinch gypsum board usually provides sufficient ignition barrier (check your local building code). When this ignition barrier is supported on a stud wall, the cavities of this wall may be filled with supplemental. Aug 28, 2013Vapour Barrier with Rigid Foam in Basement. Posted by: Dan from Stouffville. If they have not been filled with ridged board insulation. If you tuck tape the ridgid insulation AND put a vapour barrier over the batt insulation, you could be trapping moisture in between the two layers. Jan 04, 2013When installed in the correct thicknesses these to methods result in a proper vapor barrier and a superior insulation. Often times we end up insulating basement walls with a hybrid approach. First we install two inches of rigid foam board insulation (closed cell). Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings, and it is required by building codes when insulating most houses. In any case, the vapor barrier. For new construction, use rigid boards to insulate slabs and the outside of foundation walls. For a basement remodeling project, consider insulating basement walls with foam board. Use a premade kit for this type of project. Attach the tongueandgroove insulation boards to. Ive written several posts about how to insulation basement walls in which I promote the use of foam board insulation as the first line of defense against moisture and mold. Because of this I often get questions about which type of foam board insulation to use and what R values these products provide. Install Basement Wall Insulation. Attach a layer of rigid foam insulation boards directly to the concrete walls. This insulates the wall and acts as a barrier that prevents moisture vapor. Use extruded polystyrene or faced polyiso basement insulation panels. Or, apply spray foam insulation to the walls. Should I install a vapour barrier if I'm using rigid foam insulation? an installation between the studs can pose a challenge. To complete the vapor barrier you would want to foamseal or tape all the sides where the rigid meets timber, because these gaps will facilitate vapor flow. Transitioning between foam insulation and foam board in. Avoid polyethylene vapor barriers. Basement wall systems should never include polyethylene. You dont need any poly between the concrete and the foam insulation, nor do you want poly between gypsum drywall and the insulation. If your wall assembly includes studs or furring strips, polyethylene can trap moisture, leading to mold or rot. Unlike foam board insulation, Prodex Total is flexible (a roll insulation), it will adjust to the slight contours of your walls, filling the crack and gaps A true vapor barrier. Installing Basement Wall Insulation. Aliases of Rigid Foam Insulation Board insulation board, board insulation, insulation foam board, rigid foam board, 4x8 foam. Dec 02, 2008I am getting ready to finish my basement. The issue of vapor barrier has me up in the air. I have heard and read all kinds of things. Should I apply 6 mil plastic directly to the cinderblock with construction adhesive, then put the studs up, then used insulation with no batting? Please forward your suggestions.