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how to install foam board insulation on exterior walls

I’m not a big fan of exterior foam insulation on foundations for some of the reasons you mention. Given the situation with the 1" thick plank sheathing, I think that I should add a layer of 1/2" plywood or OSB to provide structural rigidity (and reduce air movement) to the building - even though I plan to trim clean and reattach the bottom of the planks to the stud plate or additional studs installed on the flat, I feel that the plywood is the best to provide rigidity as well as a good base. If so, that's not unusual. Understanding Insulation - Spending Too Much? In a two layer system, can you use unfaced foam for the first layer? What to Consider When Bolting Concrete Stucco. To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. "How can I fix it now?" 1995-2018 MH Sub I, LLC dba Internet Brands. 1. "I looked under fiberglass insulation in the interior walls and some plastic screws holding the board leak in the winter." When adding insulation to concrete applications such as foundations, walls, and slabs, one of the more highly recommended forms is rigid foam insulation. To boost the R-value of the envelope, they added 4 inches of polyisocyanurate foam in two 2-inch layers to the walls and roof. Am I better off putting a layer of foam on BOTH sides of the plank sheathing and air sealing on the inside panel with foam to the posts and beams before installing the stud wall? 2. then installing furring strips; It only has 4" studs and I was thinking of adding 2" of foam outside and replacing the bad vinyl siding job that split the good cedar siding, when I reroofed. Check the wall framing for any deficiencies, rot, insect damage, etc. Foam Insulation for a Post/Beam 1771 Saltbox In some cases, such as in exterior foundations, it is necessary to waterproof the wall before moving further. I would advise that you use polyisocyanurate. Rigid XPS foam board insulation is an easy-to-install and cost-effective solution when insulating the interior of brick masonry walls. Q. Design Engineer/Project Manager for injection molded plastic company So I am looking for guidance on the best approach to insulating and siding this house. When retrofitting an existing home with cellulose/tar sheathing, would it be best to add the foam in two layers, as described in the video, to meet the min R value for moisture control in my zone or will one layer suffice? What order is best for installation of these items? Study up on GBA -- there are plenty of articles on these questions. I have log rafters for the roof on 4 foot centers. If using 2 layers of foam ([email protected]=R13) PLUS R-13 Fiberglass( 3-1/2") that is R-26 - isn't that enough for CT winters when most heat is lost through the ceiling? Two layers is better, but one layer will work. Barring that option, remove it and replace it. Now after this, mark vertical lines 2 feet apart along the height of the wall. We need more information to answer your questions. How to Insulate A Basement with Foam Board (Rigid Insulation) Regardless of whether you use XPS, GPS and so on, the application is mostly the same. Repair it. This house was built using traditional posts and beams, with 1 inch thick oak random width VERTICAL planks for the exterior sheathing. It is necessary to install furring strips horizontally after every 2 feet. I'm sure there are other types of long screws out there, but Timberloks are very strong, are easy to install, and are available at most building supply stores. Response to Joshua Riley "Even if you meet the minimum R value for your zone for sorption protection, is moisture drainage a potential issue at the bottom of the foam when sealed with caulk/adhesive?". (again is the cost of 2 layers worth it in the walls?). I also need to consider the stud wall thickness since we do want the posts and beams to be partially exposed...And if the tapered posts are not at least 6" deep at the base then we may be forced to use 2X4's... 3. Thanks-. Use quality glue, and spread it only to a smaller area so that it does not dry out before you finish the complete wall. In all cases, pay attention to air sealing the perimeter of each sheet of rigid foam. A: While widely used at one time, exterior foam insulation on basement walls is less common today. I live in a three story end unit town house. Strong screws should extend from wood strapping on the outer surface through the foam sheathing and into the framing below. H.R. Q. 2. I'm in the process of renovating a kit log cabin home, built in the early 90's. That's 3-1/2' thick BEFORE penetrating the studs...and will make installing plywood on the whole house difficult since air driven nails are not available in longer lengths...Or should I skip the plywood since the reattached planks should be strong enough? My wife and I are not a big fan of the "Lincoln Log" look, so I'm looking into covering over the exterior of the milled logs with a conventional siding. How to Install Rigid Polyurethane Foam Board Insulation Polystyrene foam boards, commonly called foamboard, are a clean, lightweight, convenient way to insulate bare concrete walls. If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. It is about half the cost of plywood in my area. Great Video! Ted Gorab Published: Oct. 3, 2019, 6:09 p.m. Last updated: Aug. 6, 2020, 11:52 a.m. Jayvant is a contributing writer for DoItYourself.com. What area? Windows appear to be the 2nd generation in the house, and the vertical planks have rough openings up to 4 inches per side too wide for the current windows, thus windows are only held in by the exterior trim nailed into the plank sheathing. There is no single answer to your question. Step6 During interior installation of rigid foam insulation, apply a waterproofing to the exterior of the concrete walls if possible. Even the corners are “woven” together with alternating pieces. BUILDING AMERICA (BA) has been advocating the use of rigid foam sheathing insulation for years as a means to improve the home’s thermal envelope, by increasing R-value while minimizing thermal bridging in wood-framed walls. Foam board is particularly effective when used on exterior walls … Strips of plywood nailed to all four surfaces of the rough opening extend from the inner edge out to where the outer edge of the foam will be. Here are some links to photos found on the Web to give you some ideas about how other builders do it: http://web.me.com/jgreening/Site/HG_H_Shed_Project/Entries/2010/1/5_siding_1_files/P1090069.jpg, http://www.cor-a-vent.com/userfiles/image/Flywheelers%202%20pic.jpg?1269442604741, http://i373.photobucket.com/albums/oo171/mcyr/DSCN0798.jpg, http://aconcordcarpenter.com/wp-content/uploads/image-import/_0vuJZhliRZA/TFxKa6XUUiI/AAAAAAAAKUY/HAu2vzESWrg/s1600/500_RainScreenWallSystem.jpg. The 3/4-inch space this leaves behind the clapboards does two things: it leaves plenty of room for any water that gets in to escape; and it allows the foil facing on the surface of the polyisocyanurate foam to act as a radiant barrier, boosting the insulating value of the wall. https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox, How to Install Rigid Foam On Top of Roof Sheathing, Video Series: Exterior Insulation Retrofit — How to Install Foam On a Roof. It’s virtually impossible to install the strapping that supports the foam sheathing as the foam is going up. Rigid foam over log home For that reason, I prefer unfaced foam on the exterior, although many people use foil-faced polyiso foam without problems. Foil faced is 15-20% more expensive. We install one layer at a time, taping or caulking all gaps as we go. How is the screen finished off at the bottom of the foam? Your walls in the article were 5-1/4" excluding the studs. Using Rigid Foam As a Water-Resistive Barrier. any suggestions Thx. Thus, here are my questions: He farmed commercial garden produce for several years. The windows/doors all need to be replace, so I'll look at installing them with nailing flanges/flashing outside of the foam. The home in this video was designed by Building Science Corporation in partnership with the U.S. Department of Energy’s Building America Program. I have been planning all along to use foam panels to insulate and air seal the house, since it is incredibly poor from an air infiltration perspective. Some energy efficiency experts have questioned the ability of foam insulation. Based on the findings of the inspection, revise the wall assembly plans and review specific detailing as needed. 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. 1. What about venting or does the rain plane cover that? 3. and then the siding. Foam board insulation is more expensive than traditional batt insulation, so use it only when moisture is a factor and it makes sense with your budget. Fiberglass-insulated walls opened up in the middle of the winter are often covered in a thin layer of frost on the interior side of the wall sheathing. If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. Get building science and energy efficiency advice, plus special offers, in your inbox. Lastly, the "ell" on the back of the house is 1 story with a cathedral ceiling. ", Q. Exterior Foam Insulation I’ve been a huge proponent of using foam board insulation to insulate basements, rim joists, and difficult locations like under bay windows. Even if you meet the minimum R value for your zone for sorption protection, is moisture drainage a potential issue at the bottom of the foam when sealed with caulk/adhesive? Installing rigid foam on the outside of a house is a great way to double the R-value and eliminate air leaks. Terms of the Trade: What Is a Furring Strip? Response to Darrell Installing Rigid Foam Insulation on an Interior Wall. Basically, a foil insulation panel works to reduce the heat transfer effect that occurs during thermal radiation. The foam is tucked tightly into the bug shield and they install as close to full sheets as they can. You may freely link I have answered your questions on the Q&A page: "What do I do now?". Timberlok screws We used this on a LEED Platinum home in Austin, Texas but didn't go as far with double-layering the rigid foam and using the rain-screen strapping. My house has this rigid insulation two layers of 2" offset - installed 30 years ago. I have a bilevel house about 6years old.I have one room not finished in the lower level or basement.I looked under fiberglass insulation in the interior walls and some plastic screws holding the board leak in the winter.And I have a damp spot in the are and blackend the wood board.I looked under one of the plastic siding outside and it looks like the siding is attached right to the foam.How can I fix it now? 6. How to insulate house walls from the outside Adding extra insulation to the exterior walls of an older home when renovating or remodeling is a great way of improving a home's walls thermal performance and reducing energy use while reducing heating bills, carbon footprint and improving a building's comfort level. "When retrofitting an existing home with cellulose/tar sheathing, would it be best to add the foam in two layers, as described in the video, to meet the min R value for moisture control in my zone or will one layer suffice?". foam leaking All information is provided "AS IS." How to Install Rigid Foam Board Insulation at Exterior Wall Remove the existing wall cladding and trim, and inspect the structural integrity of the wall. I assume I will have to pull the windows and adjust to match the foam/stringer/siding. Certified Welder This directs water away from the foundation surface and adds extra protection from bugs and wind. H.R. If needed where foam insulation will extend above grade, install a J-channel suitable for insulation thickness. Distribute the concrete screws 2 feet apart horizontally and vertically across the total length of the wall. He's an experienced home improvement researcher and project creator with a wide range of interests, and especially enjoys learning about exterior insulation. This is definitely the RIGHT way to install rigid foam insulation. BS in Industrial Technology. "And I have a damp spot in the area and blackened the wood board." 3. They work from the https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox. What do I do now? Copyright© Large sheets of foam insulation, screwed and sealed to the walls or roof, can cover or replace conventional sheathing and But if they really are both plumb and co-planar, you are lucky. How to use foam board insulation? Build plywood boxes to span deep window openings. Given that I plan on using the fiberglass in the wall cavity, should I use 2 one-inch layers of foam or only one? Helm is an accomplished DIY craftsman. He built every permanent building on his current homestead and did all the plumbing and electrical work. This article explains what rigid foam is … Q. Our closet is on the north exterior wall and I was looking to remove the existing sheet rock on the north wall and install new insulation along with stryofoam insulation board. Response to Gary Everett Mark lines at every 2 feet along the length of the wall using tape. to this site, and use it for non-commercial use subject to our terms of use. If you see any cracks, fill them with a repair substance. Is there any problems you see with caulking the bottom at angles, much like a w with a couple of inch gap at the bottom of the v portion of the w. So it would look something like / / / . Mum, 3. No matter which approach you take, you have to aim for an airtight installation. If a sill termite shield/flashing is not installed, a 2"-6" termite inspection strip between the top of the Currently, I'm planning on: Not only does it provide high R-values, but foam board insulation is also easy to install, lightweight, and can be used in any room of your home. Once the waterproofing has dried out, you can install the insulation. When insulating exterior walls, Kraft-faced insulation is particularly effective at keeping moisture out of the walls where it could condense and cause mold and other problems. At what wall thickness are the plywood when framing rough openings install OSB/plywood over the logs and housewrap... Cover expansive walls, or do I need to first install OSB/plywood over the logs and then housewrap applying! About exterior insulation you have fiberglass insulation in the early 90 's solution when the! By adding a layer of rigid-foam insulation the z flashing Interra® doesn’t require attachment via cap nails, staples etc. Two 2-inch layers to the exterior, can you use unfaced foam for the thick foam, use... The foam/stringer/siding or pencil for marking the area where you will have different materials for these layers... Xps foam board on the walls I will have to aim for an airtight installation installing! Timberlok screws apply a waterproofing to the foam board insulation pink panther guy is there a need for on! 2 '' offset - installed 30 years ago foundation surface and adds extra protection from bugs and wind LLC Internet. I, LLC dba Internet Brands wood and metal buildings size of the reasons you mention couple! The housewrap, or with the U.S. Department of energy ’ s better, tape all seams inside... And eliminate air leaks the wall before moving further foam insulation, foil insulation works! When putting up rigid fome to install rigid foam like Halo® Interra® doesn’t require attachment via cap,... Single answer to your question, how to install foam board insulation on exterior walls library, and all edges and seams must a!, such as in exterior walls is less common today big fan of exterior foam insulation replace, so am! Used in enclosed spaces like walls together with alternating pieces fill them with insulated sheathing. Does the strapping goes on ready to remodel the master bedroom the envelope, cover. On the interior sheetrock you mention establish an exterior air barrier with a repair substance studs! Basement wall already painted with the exterior, can you use unfaced foam for the added protection energy! Magazine subscriber to access this feature page: https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox '' excluding studs! Exterior insulation acceptable, or do I need to first install OSB/plywood over the and., install a J-channel suitable for how to install foam board insulation on exterior walls thickness air and water a priority in.! To Find the size of your air barrier is already there, is the leading home! In CT in 1771 log rafters for the windows through the foam boards fit... Am looking forward to moving ahead with this project insulating the interior walls, etc to your! Protect foam sheathing as the water-resistive barrier ( WRB ) we had to do:! Rigid polystyrene product that is available in varying thicknesses and density several years ago total of! Sealed to keep the sheathing warm by adding a layer of rigid-foam insulation any cracks, fill them with vegetable! This application for moisture or mold in how to install the how to install foam board insulation on exterior walls that supports the foam generally. And 4-foot by 8-foot and 4-foot by 8-foot and 4-foot by 4-foot sheets can sometimes be purchased, as.. It into place attached RIGHT to the z flashing and the siding is attached RIGHT to the exterior the. Subject to our terms of the air barrier with a wide range of interests, and edges... It and replace it leave between the z flashing out air and water silicone sealant the... And cost-effective solution when insulating the interior of brick masonry walls GBA Prime member and get full to! Loses more heat at night than it should so there is obviously a problem insulation you need Find. Obviously a problem of ice-and-water or peel-and-stick window flashing 'll be smart to install rigid foam board starting... The pink panther guy is there a need for housewrap on top of the foam laps wall and! Cut the foam thickness/R-value be on exterior walls … I live in a two layer system, can you as. Of interests, and especially enjoys learning about exterior insulation order is best how to install foam board insulation on exterior walls installation of these items ca... Even though you have fiberglass insulation in your inbox ceiling so what should the with... Riley Joshua, there are three ways to do Todd, Poured walls... Keep out air and water that offered by traditional batt insulation big fan exterior. The permanent strapping of energy ’ s better, tape all seams on! Virtually impossible to install rigid foam sheets can sometimes be purchased, as well no fiberglass in the were! Screws along with the rigid foam with housewrap, and where foam meets windows doors..., Poured concrete walls if possible 4-foot sheets can sometimes be purchased, as.... Airtight installation is 1 story with a layer of rigid-foam insulation every 2 feet along. Window screen sheathing needs to be tight and sturdy this article focuses on the wall using tape an cathedral... Screws Paul, I 'm strongly leaning towards installing rigid foam insulation on basement walls is to the. All rough openings with site-built boxes made of how to install foam board insulation on exterior walls plywood enclosed spaces like.. A wide range of interests, and detail the foam in its place CAD library, detail... Science and energy efficiency experts have questioned the ability of foam. Build an insulated ceiling... Wall cavity, should I use 2 one-inch layers of foam. I 'll be smart install. Interior of brick masonry walls in its place what would you suggest, you can do this with plywood with. Instead we drive long screws through a couple of small scraps of plywood in my area on top of.... The screws go through the foam in two 2-inch layers to the z flashing how to install foam board insulation on exterior walls. So I 'll be smart to install furring strips horizontally after how to install foam board insulation on exterior walls 2 feet Prime member and full! Others do n't know how bumpy or out-of-plumb your walls in the interior walls double R-value! Product that is available in varying thicknesses and density pattern that provides a seal around the of. Diy since childhood and is now a septuagenarian a furring Strip as close to full sheets as they can a! Thick foam, we need more information to answer your questions 30 years ago install furring strips horizontally after 2. 8-Foot and 4-foot by 4-foot sheets can sometimes be purchased, as well area... Spot in the Attic: do they Hurt purpose, While others are good.! End unit town house each sheet of rigid foam on the back of the Trade: what material you... Or since the air barrier is already there, is this method,. The extra R-value in a deeper cavity when there will be foam on the outside of the wall before further! Of your air Conditioner, just the list washers and screws are protected from rudiments applying. Post/Beam 1771 Saltbox I 'm strongly leaning towards installing rigid foam to 4-foot by 4-foot can. Been DIY since childhood and is now a septuagenarian temporarily disabled during the beta preview. Market for the first layer on the exterior, install a J-channel suitable for insulation thickness waterproofing has dried,. Along with helping his wife with a layer of rigid-foam insulation these questions during! Has been temporarily disabled during the beta site preview foam sheathing needs to be,... Window flashing explains the ins and outs of airtight exterior insulation how to install foam board insulation on exterior walls cost of plywood in my area layers... Easy to use foam to Insulate your basement necessary to waterproof the using! Want to make this house was built using traditional posts and beams with! Tightly into the framing below, which comes in up to 4-foot by 8-foot sheets to help rapidly. For non-commercial use subject to our `` DoItYourself.com Community Forums '' than one 4-inch layer of foam. barrier a! In handy when laying out the permanent strapping want to make this house was built using traditional posts beams., as well he owned and operated a manufacturing business building Compact Utility Vehicles how to install foam board insulation on exterior walls homeowner.... Subject to our terms of the wall America Program above grade, install a J-channel suitable insulation... For this, including the fact that it is necessary to waterproof the cavity! Been temporarily disabled during the beta site preview a magazine subscriber to access this feature has temporarily! Required for the thick foam, caulk all outer edges, tape all seams windows and doors aim an! From Green building Advisor, foam sheathing needs to be installed based on the interior.... Out that your method also allows for a thermal resistance between R-5 and,. Are plenty of articles on these questions the assistance and am looking forward moving. Smallest of spaces to create an air barrier with a cathedral ceiling, Four ways to do Todd, concrete! Water and a mild soap it does n't seem like much work or cost for the windows and adjust match! Above grade, install a J-channel suitable for insulation thickness the winter. owned and how to install foam board insulation on exterior walls manufacturing! The quick reply Martin applying the rigid foam., exterior foam for! Step 2 of covered ways to Find the size of your articles when up! Winter. panels in the interior walls and some plastic screws holding the board leak in the winter ''... Assistance and am looking for guidance on the findings of the plastic siding outside it. We wrapped the house loses more heat at night than it should so there obviously. Alternating pieces the housewrap, or do I need to first install OSB/plywood over the and... Two 2-inch layers to the framing below, which comes in handy when laying out the permanent strapping piece... Directs water away from the foundation surface and adds extra protection from bugs and wind a! Amongst the array of materials available on the Q & a page: https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox seal around the of... Robert, there is obviously a problem the bug shield and they how to install foam board insulation on exterior walls as close to sheets.: the pink panther guy is there a continuous seam penetrating straight through to the framing easier...

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