Blue board is for walls that will be finished with veneer plaster. 1.25" is probably the shortest that I have seen. The other specialized wallboard product -- green board -- is intended for use in areas that will be regularly exposed to moisture. Most drywall contractors hate installing drywall directly over foam, for the reasons you mention. My idea is to tear out the plywood and remove the old FB insulation. If you are going through all that I suggest framing out walls. Rather than screwing the drywall directly into the studs, I'm toying with the idea of putting a 1/2 inch of polystyrene rigid insulation along the stud, to prevent thermal bridging. It also helps insulate and soundproof the room. One way to improve the situation is to install horizontal or vertical furring strips, 16 inches o.c., between the rigid foam and the drywall. >>Unless drywall has a hard surface that is attachable, its not a product of choice . They used tap cons to and glue to attach the foam board to the basement wall. What's going to hold your drywall. I have rigid foam board in my basement attached directly to the brick walls. Stick the foam boards with the help of the adhesive between the wall studs. Thanks… Family Handyman. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Professional installation will average an additional $0.85 to $1.50 per square foot. I only need to run wire along one of the walls I am finishing, so I am studding that wall for the sake of electric. Either that or frame a wall in front of the foam. After that, thin furring strips are installed on top of the foam to provide a firm base for the drywall screws and drywall.But can you run rigid foam between the studs, just as you would do with fiberglass rolls or spray foam? You planning on running wire? What's going to hold your drywall. The paper on the foam board, or card or whatever it is. For a better experience, please enable JavaScript in your browser before proceeding. 2-1/2" or so should do you with one inch foam board. This may allow you to bond the drywall directly to the insulation with adhesive, reducing the need for strapping or fasteners. You need a frame of some sort the anchor your wall board. If it is, I will just skip the polyiso board and install the t&g lumber directly to the ceiling joists. Implement them as deemed necessary. The typical challenge installing drywall over rigid foam is the length of screws needed to secure everything to underlying solid wood in the house frame. We tested four construction adhesives for adhering drywall to an AMVIC ICF foam block. Additional procedures that can be followed include waterproofing the walls. Never seen it here in the US, though you can get latex compound. A moisture-resistant drywall is always a good idea on a block wall. Then place your furring over the foam and secure it through the foam into the concrete. Tags: Basement & Foundation. Do I need to stud the entire basement to hang the drywall? There’s two ways you can go about with foam board insulation. Tags: Basement & Foundation. Glued foam board insulation should be allowed to dry for 24 hours before installing drywall or paneling. XPS foam must also be covered with drywall as per fire code and I wouldn't recommend putting drywall directly on top of the foam. Drywall Fire Code and Alternatives. You will need a hammer drill or else it will take a long time. Make sure to keep the drywall off the ground about a half an inch! You would also need to install a layer of drywall on the interior side of the rigid foam as a so-called thermal barrier or ignition barrier (to reduce the fire hazard). JavaScript is disabled. It may be easier to install the braces before you install the foam board on the walls and insulate your rim joist. Rather than screwing the drywall directly into the studs, I'm toying with the idea of putting a 1/2 inch of polystyrene rigid insulation along the stud, to prevent thermal bridging. Good luck! It was awkward to push the walls up but with some boards angling to the floor and ceiling he got it to stick real good. Reply. Tape the foam board joints (duct tape) and stagger the joint with the drywall directly over the foam. There is a … The good folks at Dow have had their material tested and approved for installation on the inside of foundations for certain spaces without the requirement for drywall. Not really the preferred method. I would like to replace with R15 Rockwool and about 1" of foam board insulation attached to the stud and seams taped. Secondly – and this is the best way – you can install a drywall to frame the wall before applying foam board … In this highly convenient, inexpensive, and popular application, a moisture barrier of 4- or 6-mil-thick plastic is installed directly over the wall studs. Apply a waterproof tape to the seams to seal them. As for foam versus foam board, I'd say they'll behave completely differently. Important: InSoFast panels are manufactured using a flame retardant foam and are classified as rigid foam plastic insulation. That said, if you don’t mind losing a few inches, just put a two bye three stud wall in front and pushed against, fasten to floor and ceiling. Why? Thanks ahead of time. The furring strips are not necessary, however. If the rigid foam is foil-faced, this air space will have an R-value of R-2 or R-3. https://www.youtube.com/watch?v=rhgyNqH8R-g - Foam boards are lightweight, easy to cut, and a completely waterproof. Does anyone have any experience/recommendations of the best way to do it? This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. You’re also creating the first line of defense for a cold surface toward the heated zone. Ted Gorab Oct. 3, 2019 Last updated: Aug. 6, 2020. Tape the seams in the foam board to make it a decent vapour bar. Important: InSoFast panels are manufactured using a flame retardant foam and are classified as rigid foam plastic insulation. It's hard, durable, naturally moisture- and mold-resistant, and won't rot, disintegrate or swell when exposed to water, making it ideal for use behind ceramic tile, backsplashes and countertops. There are no studs around the walls since they used tap cons and glue to attach the insulation. There’s two ways you can go about with foam board insulation. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. One common technique is to cover the block wall with drywall. The dry wall guys said not to put anything on the 2 X 4 surfaces , they wanted to place the dry wall directly … Foam board insulation is easy to cut with a circular saw with a masonry blade or scored with a utility knife and snapped like you would drywall. After 24 hours of drying time, sand it down again and repeat until the seam is smooth. They used tap cons to and glue to attach the foam board to the basement wall. After the thinset has dried, tile is applied to the sheet membrane with thinset. If your idea is for the 1.5″ foam to actually be an effective insulation, you should use bookshelf girts then place a continuous layer of closed cell foam insulation board on the inside of all girts and columns to create a thermal break. Also, is it pink/blue or foil faced. Foam should be glued to framing, then interior finish glued to the foam. finishing the space to code? In Canada I could get Elmer's Light Acrylic Drywall mud, or spackle. Siding or the like is positioned on the exterior of the foam board to form the exterior surface of the wall. Pictured: Wedi Board tile backer board. Thanks ahead of time. You can use super glue on paper, try it on raw foam. Spray adhesive is one of the most popular methods of installing foam panels but it is far from the only effective way to get the foam up in your room and looking good. Here are some tips to make the job a little easier.1\" masonry nails: https://amzn.to/2SLgTRESUPPORT MY CHANNEL FOR \"FREE\" - visit amazon through this link (or ANY link on my channel) *** https://amzn.to/37KC5LU *** and I'll get a small percent of whatever you buy from them. usually i will sheet the whole wall in 3" rigid foam, glue/nail (powder actuated fasteners) to the concrete then frame a 2x4 wall to the inside (sometimes 2x4 on the flat if space is a concern) and batt it with fibreglass. 5 / 14. You need a frame of some sort the anchor your wall board. I volunteer my help and opinions, but you are responsible for what. Drywall (also known as plasterboard, wallboard, sheet rock, gypsum board, buster board, custard board, or gypsum panel) is a panel made of calcium sulfate dihydrate (), with or without additives, typically extruded between thick sheets of facer and backer paper, used in the construction of interior walls and ceilings. If the rigid foam is foil-faced, this air space will have an R-value of R-2 or R-3. Does it have a layer of plastic on the surface? Cement board is installed directly on the studs with no plastic sheeting behind it. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. The best idea I could come up with to solve the lack of insulation issue was to layer rigid foam over the existing walls and ceiling. Position a new piece of mesh over the sanded line. Basement walls - gluing foam/drywall. It’s not enough to just sand directly over the seam. Lay a piece of drywall board flat on the ground with the paper side down. I don't think you can attach drywall over (flexible) plastic foam. The dry wall guys said not to put anything on the 2 X 4 surfaces , they wanted to place the dry wall directly on the bare wood. Secondly – and this is the best way – you can install a drywall to frame the wall before applying foam board insulation. I have a dart board in a cabinet that I want to mount on a wall that’s made of drywall. The adhesive needs to be of good quality, preferably superglue or an industrial adhesive. They fall into the same class as pink, blue and yellow insulation boards which are required by code to be covered by ½” drywall or any other approved 15-minute thermal barrier (IBC 2603.4). Helping You to Do It Yourself! away from the foam as a guide for the bottom plate. Reply. I am concerned that the outer layer of foil/plastic on this type of foam board may trap excessive moisture in comparison to the “blue board” (higher density) foam. I then layed down some barricade subfloor panels thoughout the room, then built a 2x4 wall snug up against the ridgid board on top of the subfloor, and insulated these cavities with roxul insulation. Foam board insulation is flammable and must be covered with drywall or paneling. The siding is in OK shape but I really want the plywood panel interior gone and replaced with drywall. The problem with that application has always been that the foam board needed to be covered with a “thermal barrier” or “flame spread barrier” like drywall in order to meet local fire codes. January 18th, 2005, 06:26 PM #2. Blue board and green board are both designed for use in applications where regular drywall wouldn't be sufficient. It will be harder to get clean screw heads on the drywall with this method. We tested four construction adhesives for adhering drywall to an AMVIC ICF foam block. Foam have a shiny silver surface? The correct method of using rigid foam is to run continuous 4-foot by 8-foot sheets of the foam across the concrete basement wall, making the rigid foam the de facto wall. I plan on using the appropriate length screws for the drywall, to compensate for whatever foam board i go with. Is that really standard practice?
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