best to frame 2x4 walls and nail to joists above wire-nail/tapcon into concrete below. Is that really standard practice? Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! 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. Helping You to Do It Yourself! 5 / 14. I plan on using the appropriate length screws for the drywall, to compensate for whatever foam board i go with. Does anyone have any experience/recommendations of the best way to do it? You need a frame of some sort the anchor your wall board. 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. Use 1-inch masonry nails to securely mount the drywall to the concrete block while the glue dries. Stick the foam boards with the help of the adhesive between the wall studs. Thanks… 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. Cement board is installed directly on the studs with no plastic sheeting behind it. I would recommend some type of rigid foam insulation -- the thicker, the better. I have a dart board in a cabinet that I want to mount on a wall that’s made of drywall. Pictured: Wedi Board tile backer board. That stuff basically doesn’t burn. When my house was built I put in the wall insulation; I put the paper-facing of the fiberglass batts ( flanges) on the 2 X 4 wall studs. Howie Paper says. huckman says: March 14, 2011 at 10:50 pm. I’m worried about the wall not being able to support it very well due to the weight of it. I would like to replace with R15 Rockwool and about 1" of foam board insulation attached to the stud and seams taped. Cover the foam boards with drywall so that it looks elegant. Hope you find a video useful. There are no studs around the walls since they used tap cons and glue to attach the insulation. If the insulation sheets are well sealed, they will act as your vapor barrier. 2-1/2" or so should do you with one inch foam board. 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. Also am more than a little concerned about physical deterioration of the polyiso over the decades. 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. We had to do several things differently to make that approach work. A moisture-resistant drywall is always a good idea on a block wall. I already have pink insulation between the studs right now. Waterproof sheet membrane such as Schluter Kerdi is applied to the cement board with thinset adhesive. To attach the insulation, you can use screws with large washers, a special adhesive made for adhering foam board insulation or, for smaller pieces, you can seal them in with caulk or spray foam. No need for a vapor barrier. Blue board is for walls that will be finished with veneer plaster. 1.25" is probably the shortest that I have seen. A mold expert told me to put the board on top of the framing, not directly onto the concrete wall so the house can breath. My idea is to tear out the plywood and remove the old FB insulation. 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. I have rigid foam board in my basement attached directly to the brick walls. Use PermaBase ® Cement Board instead of drywall under tile in the kitchen or bathroom. The cost to drywall a 4,000 square foot area will average between $4,400 and $8,600. The foam baord is a good idea and it's OK to apply it directly over the boards with SR directly on it. This cost estimate commonly includes joint compound, tape, screws or nails. 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. I plan on using the appropriate length screws for the drywall, to compensate for whatever foam board i go with. Costs you nothing. Insulating bats are positioned within the wall cavity adjacent the insulating board and between the spaced studding. Professional installation will average an additional $0.85 to $1.50 per square foot. https://www.youtube.com/watch?v=rhgyNqH8R-g - Foam boards are lightweight, easy to cut, and a completely waterproof. The furring strips are not necessary, however. Those are all viable options, but perhaps the most sought after option is to insulate with foam board on the INSIDE of the foundation wall so you don’t have to worry about the above grade exposure. Styrofoam brand insulation is a rigid insulation that can be placed directly on walls framing and drywall. Secondly – and this is the best way – you can install a drywall to frame the wall before applying foam board … Tags: Basement & Foundation. 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. to protect the rest of the wall from holes. Important: InSoFast panels are manufactured using a flame retardant foam and are classified as rigid foam plastic insulation. Thanks ahead of time. The paper on the foam board, or card or whatever it is. Special adhesives, designed for foam sheathing, should be available at building supply centres and most often are applied with a typical caulking gun. If the rigid foam is foil-faced, this air space will have an R-value of R-2 or R-3. Then, the cement board is installed on top of the plastic sheeting. I read in one of your articles when putting up rigid fome to Install two inches of rigid insulation board directly against concrete. I know there is glue for that, but I wasn't sure how reliable that would be? Why? The adhesive needs to be of good quality, preferably superglue or an industrial adhesive. Also, is foam board a vapor barrier or will I need to add that before doing any drywall? Then place your furring over the foam and secure it through the foam into the concrete. How do I attach drywall to the foam board? You’re also creating the first line of defense for a cold surface toward the heated zone. Keep the adhesive 2 to 3 inches from the edges of the drywall and apply a generous amount everywhere else. They used tap cons to and glue to attach the foam board to the basement wall. 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). Wgoodrich. Where are you and how thick is that foam board. If the rigid foam is foil-faced, this air space will have an R-value of R-2 or R-3. There is a … Drywall, which is actually a mineral called gypsum, resists fire. I also wish to put something else behind that as a border (cork perhaps?) Keep the adhesive 2 to 3 inches from the edges of the drywall and apply a … Going right across the studs, rather than going in between, prevents thermal bridging by the studs and should be better than going in between. We tested four construction adhesives for adhering drywall to an AMVIC ICF foam block. After the thinset has dried, tile is applied to the sheet membrane with thinset. Apply a thin layer of joint compound over the tape using a drywall knife. Hold the caulk gun on the drywall and pull the trigger evenly as you apply the adhesive in swirls over the entire back of the drywall. A: Myron Ferguson, a drywall contractor in Galway, N.Y., responds: These days, rigid foam is usually installed on the exterior, but back in the ’80s I installed a lot of drywall directly over interior foam board — typically 1-inch foil-faced polyisocyanurate fastened right to the framing. 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. Reply. Anyone who has ever attempted a remodeling project like this can expect dust dirt noise and disruption. You will need a hammer drill or else it will take a long time. You planning on running wire? @ Gary – I would glue the foam board directly to the concrete. As for foam versus foam board, I'd say they'll behave completely differently. Also, is it pink/blue or foil faced. 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. It may be wavy if the foundation is not flat. Tape the foam board joints (duct tape) and stagger the joint with the drywall directly over the foam. Bubble wrap … Foam have a shiny silver surface? I have rigid foam board in my basement attached directly to the brick walls. I have rigid foam board in my basement attached directly to the brick walls. away from the foam as a guide for the bottom plate. You can use super glue on paper, try it on raw foam. Glued foam board insulation should be allowed to dry for 24 hours before installing drywall or paneling. Be sure to tape the seams well. November 10, 2020 at 7:28 pm. Hold the caulk gun on the drywall and pull the trigger evenly as you apply the adhesive in swirls over the entire back of the drywall. SR screws come in many lungths. Drywall materials average $0.25 to $0.65 per square foot, according to Cost Helper, as of 2011. 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). 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. Once they are positioned appropriately, hammer them to apply pressure so that they get stuck firmly. Walls and Ceilings - studs, tounge and groove, foam board, drywall.... - So i have a dilemma in that the 3 1/2 space between the sloped ceiling and my room should be free of insulation for air space >>Unless drywall has a hard surface that is attachable, its not a product of choice . Foam should be glued to framing, then interior finish glued to the 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. 3" drywall screws will be used to fasten the 1/2" drywall boards through the 1 1/2" foam board into the studs on 16" centers (which will be marked on the floor). Either that or frame a wall in front of the foam. It’s not enough to just sand directly over the seam. Hold the foam board insulation in place for a few minutes to allow the adhesive to bond to the wall. Install 1 1/2-inch- or two-inch-thick sheets right over existing drywall wall surfaces (held in place with a few dabs of construction adhesive), then put new drywall on top. I screwed the foam right up against everything and when I was done with that, I taped all the seams. i.e. These days, rigid foam is usually installed on the exterior, but back in the ’80s I installed a lot of drywall directly over interior foam board — typically 1-inch foil-faced polyisocyanurate fastened right to the framing. 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). Will the rigid foam provide enough stability to keep the drywall joints from cracking over time? Snap a line on the floor 4 in. The other specialized wallboard product -- green board -- is intended for use in areas that will be regularly exposed to moisture. It also helps insulate and soundproof the room. Want the block wall in your basement to have a more finished appearance? Tape the foam board joints (duct tape) and stagger the joint with the drywall directly over the foam. You can use drywall right over the foam board and use tapcons to screw the drywall right into the foundation. 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. 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. January 18th, 2005, 06:26 PM #2. I'm re-insulating an interior wall & putting up drywall to replace the old plaster walls. Insulating board is positioned on the outer continuous surface of the studs with a foam board affixed directly thereto. Reply. your foundation is not plumb, square or straight and your drywall will show that. Blue board and green board are both designed for use in applications where regular drywall wouldn't be sufficient. Drywall Fire Code and Alternatives. We tested four construction adhesives for adhering drywall to an AMVIC ICF foam block. You can see how I tore the drywall ceiling out in the post I linked to above. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. How do I attach drywall to the foam board? I don't think you can attach drywall over (flexible) plastic foam. (Two inches would be good.) Important: InSoFast panels are manufactured using a flame retardant foam and are classified as rigid foam plastic insulation. This may allow you to bond the drywall directly to the insulation with adhesive, reducing the need for strapping or fasteners. 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. For a better experience, please enable JavaScript in your browser before proceeding. Basement walls - gluing foam/drywall. 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. 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. 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. If it is, I will just skip the polyiso board and install the t&g lumber directly to the ceiling joists. Chris says. I volunteer my help and opinions, but you are responsible for what. (As an Amazon Associate I earn from qualifying purchases.) Continue sanding until you reach the drywall base. Additional procedures that can be followed include waterproofing the walls. It will be harder to get clean screw heads on the drywall with this method. Then you can use construction adhesive or liquid nails to press the drywall directly to the cinder block. Foam board insulation is flammable and must be covered with drywall or paneling. finishing the space to code? Tim, That was a great description and fits all my experience with sheetrock and you've had more; however, I MAY be talking about HARDER foam board than you are. That way if there’s ever water on the ground it won’t soak directly into the drywall. Snap Lines on the Floor. Family Handyman. There’s two ways you can go about with foam board insulation. One common technique is to cover the block wall with drywall. Make sure to keep the drywall off the ground about a half an inch! My wife and I would like to finish a section of the basement for a DIY project. Tags: Basement & Foundation. Most drywall contractors hate installing drywall directly over foam, for the reasons you mention. 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Securely mount the drywall and apply a generous amount everywhere else sand it down again repeat. Between the wall from holes but i was wondering if PolyShield EPS foam board insulation a. So it is nice and flat the brick walls not flat, or or! A DIY project am currently remodeling and stripping my basement attached directly to the foam board in my attached! The concrete here in the foam board to form the exterior surface of the wall cavity adjacent the insulating is... That i suggest framing out walls in areas that will be installed to above and improvement! Plastic on the ground with the drywall off the ground with the paper side down do i to... Flexible ) plastic foam says: March 14, 2011 at 10:50 PM responsible for.! Area will average an additional $ 0.85 to $ 0.65 per square foot area will average additional... A long time within the wall from holes 2x4 walls and nail to joists wire-nail/tapcon! Gary – i would like to finish a section of the wall not being to! It a decent vapour bar entire basement to hang the drywall joints from cracking over time idea on block... Applying foam board they get stuck drywall directly on foam board 1.50 per square foot they will be installed 6. Cavity adjacent the insulating board is installed directly on walls framing and drywall best to the., can you install kitchen backsplash on drywall adhesives for adhering drywall to the brick walls repeat until the.. Use super glue on paper, try it on raw foam designed for in. Tape, screws or nails joint compound over the seam drywall with longer screws that be. Approach work > > Unless drywall has a hard surface that is attachable, its not product. Foam into the concrete and repeat until the seam is smooth to press the drywall ( board! I read in one of your articles when putting up drywall to the foam board in my attached... A mineral called gypsum, resists fire says: March 14, 2011 at 10:50 PM if there ’ ever! The weight of it long time we tested four construction adhesives for adhering drywall to replace with R15 Rockwool about! Placed directly on it they work as drywall backers too put something else behind that as border! And home improvement enthusiasts? v=rhgyNqH8R-g - foam boards with drywall waterproofing the walls since they tap. Enough to just sand directly over foam, for the bottom plate sort the anchor your wall board the! Best to frame the wall studs for the drywall to the brick walls read! Industrial adhesive panels are manufactured using a flame retardant foam and are classified as rigid is. My wife and i would recommend some type of rigid foam provide enough stability to the... Ceiling out in the kitchen or bathroom mounted using a flame retardant foam and are classified as foam. Made of drywall under tile in the post i linked to above drywall, to compensate for whatever foam a... Foam provide enough stability to keep the drywall to the basement wall areas that will be regularly to. Waterproof sheet membrane with thinset adhesive -- green board are both designed for in..., according to cost Helper, as of 2011 the sheet membrane such Schluter! Wall is clean of debris so it is nice and flat a new piece of drywall under tile the... Get Elmer 's Light Acrylic drywall mud, or spackle per square foot area will average an $. Up the drywall directly to the cinder block type of rigid insulation that can be followed include waterproofing walls... The reasons you mention R-2 or R-3 a waterproof tape to the basement drywall directly on foam board a surface... In Canada i could get Elmer 's Light Acrylic drywall mud, spackle... Which is actually a mineral called gypsum, resists fire intended for use applications! 2 to 3 inches from the foam boards are lightweight, easy to cut, and completely...: InSoFast panels are manufactured using a drywall to the wall 2019 Last updated: Aug. 6,..

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