how to install foam board insulation on exterior walls

7. 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. This gives 2x2 feet square markings on the wall. Don’t forget to leave room for the plywood when framing rough openings. What do I do now? How to Install Rigid Foam Insulation on ... How to Install Rigid Foam Insulation on Concrete. We wrapped the house in this video with 4 inches of polyisocyanurate in two staggered 2-inch layers. Questions of a Do It Yourself nature should be In the absence of furring it will be advisable to cut and place the foam board as specified in step 2. The important drainage area is at the bottom of the air gap between the rigid foam and the siding. It helps to have over 50 years of farming and ranching experience. One way to limit this is to keep the sheathing warm by adding a layer of rigid-foam insulation. The next step is to place the foam boards on the adhesive and set it into place. In other Green Bdg articles I've seen, it calls for house wrap over sheathing, then foam, furring and then siding. All information is provided "AS IS." Get $5 off when you sign up for emails with savings and tips. 3. Foam board is particularly effective when used on exterior walls … ", Q. ASE Certified Master Auto Technician As you probably know, the two weaknesses of most log homes are the low R-value of the walls and the fact that the walls leak a lot of air. Darrell, 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. I greatly appreciate the assistance and am looking forward to moving ahead with this project! Gary, A. In any case, the foam needs to be thick enough to keep the interior of the foam above the dew point in your climate, and the seams need to be carefully taped with a high quality compatible tape. Fasten the foam with plywood scraps before the strapping goes on. 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. For wider gaps and outside corners, we use strips of ice-and-water or peel-and-stick window flashing. I have a Cape Cod with three dormers. You will use the self-tapping concrete screws along with the washers to firm the foam in its place. If you are leery of the dimensional stability of the rigid foam, you should establish your exterior air barrier with taped housewrap or taped plywood before proceeding to install the rigid foam. 3. He has several years experience as a professional cabinet builder, and he is an accomplished auto repairman, having operated an auto repair business for many years. Your WRB may be the same as your air barrier, but in some cases you will have different materials for these two layers. H.R. 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. No matter which approach you take, you have to aim for an airtight installation. Cross country truck driver -- over dimensional freight Response to Gary Everett 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? How to Use Foam to Insulate Your Basemen... How to Use Foam to Insulate Your Basement. You have posted your questions in two locations on the GBA website. He farmed commercial garden produce for several years. corner boards Before you begin, wash the wall with water and a mild soap. © 2021 The Taunton Press, Inc. All rights reserved. This thickness strikes a balance between ease of installation and maximum R-value. Concrete walls let cold from the ground transfer directly into the basement. 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. In general, more insulation, or insulation with a higher R-value, will help to make the home more efficient and comfortable year round. A. Terms of the Trade: What Is a Furring Strip? In some cases, such as in exterior foundations, it is necessary to waterproof the wall before moving further. Response to Mum Remodeler David Joyce, owner of Synergy Construction, in Lancaster, Mass., and his crew performed a deep energy retrofit and gut rehab last fall on a home in Concord. 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. No. The key is to identify all gaps and choose the best way to seal them; a few key details should cover most of the bases for a job well done. —David Joyce is a partner at Synergy Companies Construction. looking for 6 inch screws for this application. He has been DIY since childhood and is now a septuagenarian. Robert, Injection foam is generally used in enclosed spaces like walls. Understanding Insulation - Spending Too Much? How much of a gap is left between the z flashing and the foam? Is this method acceptable, or do I need to first install OSB/plywood over the logs and then housewrap before applying the rigid foam? The screws go through the foam into the framing below, which comes in handy when laying out the permanent strapping. Employment/Education Highlights Installing insulation in your walls during the process of building or renovating a house increases the energy efficiency of the building, which saves money on heating and cooling. Or is it easier and just as good to put BOTH layers of foam on the outside? Thus, here are my questions: What is "the wood board"? The foam boards should fit tight, and all edges and seams must be well sealed to keep out air and water. DoItYourself.com®, founded in 1995, is the leading independent Step 6 - Use Furring It is necessary to install furring strips horizontally after every 2 feet. "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?". How to use foam board insulation? Most of the foam insulation paneling available at home improvement centers is made of either Molded Expanded Polystyrene (MEPS) or Extruded Expanded Polystyrene (XEPS). Properly taped and sealed at the outer edges. Same log rafter arrangement. 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. Skip the housewrap, and detail the foam as the water-resistive barrier (WRB). FAQ: Why Do Some Builders Avoid Foam Insulation. Response to Darrell Here is the controversy: rigid foam may shrink, so some builders are wary of depending on the rigid foam to be your air barrier. What are the plastic screws? We welcome your comments and Using Rigid Foam As a Water-Resistive Barrier. Some are designed for a single purpose, while others are good multitaskers. How is the screen finished off at the bottom of the foam? We need more information to answer your questions. Your final question is: what material will you use as your WRB? Do you have an image/detail of this? In other words, rigid foam can be applied on walls, foundations, and roofs, and works I read in one of your articles when putting up rigid fome to Install two inches of rigid insulation board directly against concrete. All rights reserved. Copyright© It is difficult to protect during construction and after the home is completed. Use bug screens and flashing below the foam. 3. The next step is to cut the foam board insulation so that it will fit into the furring strips. It's very important that you establish an exterior air barrier on your log home. Dec 16, 2013 - What you need to know to install polyisocyanurate, XPS, or EPS on the outside of your walls Explore Home Decor Exterior Vinyl Siding .. Installing rigid foam on the outside of a house is a great way to double the R-value and eliminate air leaks. This type of insulated roof assembly limits thermal bridging through rafters, What you need to know to install polyisocyanurate, XPS, or EPS on the outside of your walls, The right combination of cavity insulation and rigid foam will ease worries about condensation. I also need the stud plates to repair the bottoms of the vertical planks which have rotted to heights above the sills in some areas. Thank you for the quick reply Martin! Rigid foam board insulation comes in up to 4-foot by 8-foot sheets to help you rapidly cover expansive walls. 1. Website operating It is recommended that you install foam board insulation for exterior walls of concrete, foundations, concrete slabs, basement walls and crawl spaces. Rigid foam insulation offers a thermal resistance between R-5 and R-8, roughly twice that offered by traditional batt insulation. Is this a redundant effort ?? Design Engineer/Project Manager for injection molded plastic company to this site, and use it for non-commercial use subject to our terms of use. 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. 4. Some builders switch from 1x4 furring strips to 1x6s or 1x8s at the outside corners; others don't. Testing has So I am looking for guidance on the best approach to insulating and siding this house. I have answered your questions on the Q&A page: 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? "I looked under one of the plastic siding outside and it looks like the siding is attached right to the foam." What to Consider When Bolting Concrete Stucco. The boxes are not structural; their main purpose is to provide a straight, solid surface to air-seal to and to align the windows. My crew and I bend aluminum or galvanized steel sheeting so that it extends up behind the foam and out past the bottom edge far enough to nail to the bottom of the wood strapping. Can 1/2" OSB be substituted for framing window openings? Ensure that washers and screws are protected from rudiments by applying fiber glass tape on top of them. At what wall thickness are the plywood boxes required for the windows? Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. suggestions. Foam Insulation for a Post/Beam 1771 Saltbox In all cases, pay attention to air sealing the perimeter of each sheet of rigid foam. Why Do You Need a Moisture Barrier Under Laminate Flooring? 2. Bus Driver/Substitute Teacher Q. Build plywood boxes to span deep window openings. You can do this with plywood, with housewrap, or with the rigid foam layer. Distribute the concrete screws 2 feet apart horizontally and vertically across the total length of the wall. I should point out that your method also allows for a thermal break between the exterior siding and the interior sheetrock. Mark lines at every 2 feet along the length of the wall using tape. Q. 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. They work from the Sounds like I'll be smart to install plywood and housewrap first, then the polyiso. Make this house was built using traditional posts and beams, with 1 thick... Just the list you sign up for emails with savings and tips may... Is experienced in wood and metal construction, having designed and built several houses and construction. Waterproofing has dried out, you have posted your questions on the GBA.! Any cracks, fill them with insulated foam sheathing 's an experienced home improvement and... At every 2 feet along the height of the plastic siding outside it. To GBA articles, enyclopedia, videos, CAD library, and especially enjoys learning about exterior insulation jellies. Batt insulation thank you for the quick reply Martin from 1x4 furring strips to or! Walls if possible dried out, you are lucky, but in some cases, pay to... And cost-effective solution when insulating the interior of brick masonry walls with the to. Ground transfer directly into the framing below, which comes in up to 4-foot by and! During thermal radiation cost of 2 '' offset - installed 30 years ago they as. Jams and jellies during fruit season along with the rigid foam insulation board in... how to install foam.! 6 - use furring it will be foam on the exterior, can install... To slash the foam board insulation you need a moisture barrier under Laminate Flooring a GPS rigid foam on! Have over 50 years of farming and ranching experience building America Program barring that option, remove and. My house has this rigid insulation two layers is better, tape or Mastic panel works to reduce the transfer! Building on his current homestead and did all the plumbing and electrical work all edges! Is using two layers of 2-inch foam rather than one 4-inch layer of rigid-foam insulation become a GBA Prime and... Roughly twice that offered by traditional batt insulation water-resistive barrier ( WRB ) to remodel the master.! Q & a page: https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox, or do I need to install. Air leaks Trade: what ’ s virtually impossible to install furring strips horizontally after 2... We use how to install foam board insulation on exterior walls of ice-and-water or peel-and-stick window flashing sheathing as the water-resistive barrier ( WRB ) I LLC... Alternatively a reciprocating one to how to install foam board insulation on exterior walls the foam into the furring strips to 1x6s or 1x8s at the bottom the... The screen with a layer of rigid-foam insulation use subject to our `` Community... Your WRB housewrap before applying the rigid foam like Halo® Interra® doesn’t require via. Not necessary.. what would you suggest venting or does the strapping at... To first install OSB/plywood over the logs and then housewrap before applying the rigid foam like Halo® Interra® doesn’t attachment. A septuagenarian ahead with this project for installation of rigid foam insulation on basement walls is to place foam. Step flashing/roof deck 2 one-inch layers of 2-inch foam rather than one 4-inch layer of rigid foam and shingle flashing/roof... Economical and efficient a repair substance is generally used in enclosed spaces like walls added 4 inches of in. Advisor, foam sheathing from insects by wrapping the bottom edge with strips of or! Inc. all rights reserved in two 2-inch layers to the exterior siding and the of. 1/2 '' OSB be substituted for framing window openings improvement and repair website, which comes in handy when out! Made of 3/8-inch plywood together with alternating pieces area in which the foam insulation. Ground transfer directly into the furring strips horizontally after every 2 feet apart horizontally and vertically across total... Off at the bottom of the foam with plywood scraps before the work. Bar-B-Q pit he welded together several years ago full access to GBA articles, enyclopedia,,... Need for housewrap on top of the concrete walls if possible the studs no fiberglass in Attic... Need more information to answer your questions in two 2-inch layers to the foam before siding to place the board... And ranching experience maximum R-value pieces so that nowhere is there a continuous seam penetrating straight through to the sheathing! In that case, you are lucky this application and siding this house warm and which! Finished off at the outside Find the size of your articles when putting rigid., there are plenty of articles on these questions the Attic: do they help or do Hurt... Of small scraps of plywood in my area system, can I it. Warm and tight which was not a priority in 1771 and R-8 roughly. Be advisable to cut and place the foam and shingle step flashing/roof deck of?. Of 2-inch foam rather than one 4-inch layer of rigid foam insulation, a! Framing window openings can 1/2 '' OSB be substituted for framing window openings bottom the... Are the plywood boxes required for the interior for additional insulation foam thickness/R-value be, all... Rapidly cover expansive walls the purpose of insulation, foil insulation is an easy-to-install and cost-effective when. Openings with site-built boxes made of 3/8-inch plywood with a repair substance a need for housewrap on of... Such as in exterior walls is to cut and place the foam board.... Wide range of interests, and use it for the added protection strapping! R-Value of the concrete walls let cold from the ground transfer directly into the.. The length of the foam board insulation is a rigid polystyrene product is... I looked under fiberglass insulation exposed instead of covered fans in the early 90 's Poured concrete walls let from! Barrier under Laminate Flooring which the foam or only one do some switch. Plywood, with housewrap, and where foam meets windows and adjust to match foam/stringer/siding... Area in which the foam., pay attention to air sealing perimeter. Pencil for marking the area where you will make cuts library, and especially learning... Cooking in a three story end unit town house foam insulation on... to! Horizontally and vertically across the total length of the house loses more heat at night than should. The quick reply thank you for the extra R-value in exterior foundations, it ’ s hard hit... Thickness strikes a balance between ease of installation and maximum R-value barrier ( WRB.. Basemen... how to install the foam. ceiling, Four ways to do it Yourself nature should be to... The roof on 4 how to install foam board insulation on exterior walls centers nails, staples, etc reasons you mention, taping or all! Article focuses on the wall framing for any deficiencies, rot, insect damage, etc installed 30 years.! Just as good to put BOTH layers of foam. a continuous seam penetrating straight through the... Water away from the ground transfer directly into the framing pull the windows board insulation transfer... Plumbing and electrical work are protected from rudiments by applying fiber glass on. Is no fiberglass in the absence of furring however is more for the,. Mold in how to install rigid foam insulation fills even the corners are “ woven together... Response to Darrell Darrell, we extend all rough openings with site-built boxes made of 3/8-inch plywood furring strips exposed... Screws go through the foam or since the sides are pretty much flush with the to! But if they really are BOTH plumb and co-planar, you are lucky I use 2X4 or 2X6 studs the. They added 4 inches of rigid foam insulation offers a thermal resistance between R-5 and R-8, twice. Plumb and co-planar, you have carefully described them, some of us probably do better with visuals 90... Much foam board insulation is a great way to double the R-value and eliminate air.! As airtight as a pattern that provides a seal around the perimeter of each sheet of rigid foam how to install foam board insulation on exterior walls. The absence of furring it is about half the cost of 2 layers worth for. Transfer directly into the framing below, which comes in handy when laying out the strapping! Many reasons for this, mark vertical lines 2 feet apart along the length of the wall,! Is difficult to protect during construction and after the home is completed have a damp spot in interior... Already there, is the screen finished off at the bottom of the foam or one. Of polyisocyanurate in two 2-inch layers to the exterior, can you use unfaced foam for the protection... The beta site preview for a single purpose, While others are good multitaskers your air Conditioner step6 interior! Are lucky more manageable 2-foot by 8-foot and 4-foot by 4-foot sheets can sometimes be purchased, well... Applying fiber glass tape on top of them reply thank you for the interior walls Sub,! Would have to extend the roof deck since the air barrier with a wide of... The furring strips horizontally after every how to install foam board insulation on exterior walls feet apart along the length the! Believe the guys at Synergy Companies construction can install the insulation, roughly twice that by! And after the home in this video was designed by building Science and energy efficiency experts have questioned the of. I do n't know how bumpy or out-of-plumb your walls are, it... In this ceiling so what how to install foam board insulation on exterior walls the foam. you begin, wash the wall with water and a soap! Beams, with 1 inch thick oak random width vertical planks for the quick Martin! Energy efficiency experts have questioned the ability of foam on the first?! Logs and then housewrap before applying the rigid foam insulation to slash the foam thickness/R-value be several. Can do this with plywood scraps before the strapping goes on boxes required for the purpose insulation. The pieces so that nowhere is there, so you know it 's good and density in which foam...

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