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They work from the View our Privacy Policy here. Ensure that washers and screws are protected from rudiments by applying fiber glass tape on top of them. 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. The screws go through the foam into the framing below, which comes in handy when laying out the permanent strapping. Questions of a Do It Yourself nature should be If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. Cross country truck driver -- over dimensional freight Before you begin, wash the wall with water and a mild soap. Here is the controversy: rigid foam may shrink, so some builders are wary of depending on the rigid foam to be your air barrier. We offset the pieces so that nowhere is there a continuous seam penetrating straight through to the framing. problems contact webmaster@doityourself.com. Calculate the size of the area in which the foam board insulation is to be installed. Some builders switch from 1x4 furring strips to 1x6s or 1x8s at the outside corners; others don't. 3. and then the siding. ASE Certified Master Auto Technician BS in Industrial Technology. "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?". This article explains what rigid foam is … Birds and other critters have gotten into it. It helps to have over 50 years of farming and ranching experience. What is "the board"? Most of the foam insulation paneling available at home improvement centers is made of either Molded Expanded Polystyrene (MEPS) or Extruded Expanded Polystyrene (XEPS). Given that I plan on using the fiberglass in the wall cavity, should I use 2 one-inch layers of foam or only one? No matter what type of house you’re insulating, how well the rigid foam is connected to the rest of the wall makes all the difference in performance and durability. This article focuses on the first layer on the walls. The house loses more heat at night than it should so there is obviously a problem. Barring that option, remove it and replace it. In other words, rigid foam can be applied on walls, foundations, and roofs, and works How does the strapping work at corners (i.e. 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. enjoys making jams and jellies during fruit season along with cooking meals. Design Engineer/Project Manager for injection molded plastic company Jayvant is a contributing writer for DoItYourself.com. © 2021 The Taunton Press, Inc. All rights reserved. 3. 1. If so, that's not unusual. 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. Prepping Openings for Windows and Doors, 6. EPS and polyiso board are the most environmentally friendly choice as they typically use pentane as its blowing agent, which is fairly benign to global warming. To compensate for the thick foam, we extend all rough openings with site-built boxes made of 3/8-inch plywood. I'm in the process of renovating a kit log cabin home, built in the early 90's. Many builders protect foam sheathing from insects by wrapping the bottom edge with strips of window screen. The next step is to One way to limit this is to keep the sheathing warm by adding a layer of rigid-foam insulation. 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. 1. Response to Jon Ackley-Jelinek 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. He currently has a home shop where he sharpens and rebuilds saws, repairs lawn mowers, mobility scooters, hydraulic jacks, and anything else that comes along. In that case, you may be able to achieve an air barrier with a layer of rigid foam. Jon, Foam Insulation for a Post/Beam 1771 Saltbox Your final question is: what material will you use as your WRB? corner boards Installation Questions No. He built every permanent building on his current homestead and did all the plumbing and electrical work. How to Install Foam Insulation Board in ... How to Install Foam Insulation Board in A Basement. David, it would be nice to see a few rough drawings of your key details. 1. installing the rigid foam directly over the logs (since it's a kit home and the logs are milled, the exterior surface is largely in plane and free from excessive bumps, warping and inconsistencies); 1995-2018 MH Sub I, LLC dba Internet Brands. I'll know better next time. Basically, a foil insulation panel works to reduce the heat transfer effect that occurs during thermal radiation. How to Install Rigid Foam Insulation on ... How to Install Rigid Foam Insulation on Concrete. In a two layer system, can you use unfaced foam for the first layer? Robert, Paul, What do I do now? In general, more insulation, or insulation with a higher R-value, will help to make the home more efficient and comfortable year round. Is this a concern for moisture or mold in Also water damage. Use your numbers to determine how much foam board insulation you need. We wrapped the house in this video with 4 inches of polyisocyanurate in two staggered 2-inch layers. "And I have a damp spot in the area and blackened the wood board." Really great video. How is the screen attatched to the z flashing? What is broken? Large sheets of foam insulation, screwed and sealed to the walls or roof, can cover or replace conventional sheathing and create a continuous barrier to heat loss or gain—something you don’t get with cavity insulation alone. 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. 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. What would you recommend for foam panel/cold roof insulation on the exterior since I plan on re-roofing anyway and can also add fiberglass between the log rafters? In the absence of furring it will be advisable to cut and place the foam board as specified in step 2. So I am looking for guidance on the best approach to insulating and siding this house. 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. House Wrap 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. 2. If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. Please enter in your email 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? This won't delete the articles you've saved, just the list. Solid-wood strapping screwed through the foam into every stud will pull the sheathing tight to the framing and provide a solid nailing surface for siding and trim. Use quality glue, and spread it only to a smaller area so that it does not dry out before you finish the complete wall. Terms of the Trade: What Is a Furring Strip? 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. This directs water away from the foundation surface and adds extra protection from bugs and wind. Response to Joshua Riley He farmed commercial garden produce for several years. He maintains fruit and nut trees along with helping his wife with a vegetable garden. Installing rigid foam on the outside of a house is a great way to double the R-value and eliminate air leaks. 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. My house has this rigid insulation two layers of 2" offset - installed 30 years ago. Helm is an accomplished DIY craftsman. Mark lines at every 2 feet along the length of the wall using tape. Note: the pink panther guy is there, so you know it's good. When done correctly, with the boards secured flush against the brick wall, and the seams properly 1. Great Video! Thank you for the quick reply I would advise that you use polyisocyanurate. Darrell, He also builds custom tools for metal working. 2. then installing furring strips; 5. Then I could use 5 inch TImberlock screws through the 3-3/4" plank/foam/furring.. With the current condition of the planks, the house still appears straight, no sagging or racking. Concrete walls let cold from the ground transfer directly into the basement. A. 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. "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 Insulate A Basement with Foam Board (Rigid Insulation) Regardless of whether you use XPS, GPS and so on, the application is mostly the same. Sorry for so many questions, but I can only do this once and prefer it to be the CORRECT way... Key details Fasten the foam with plywood scraps before the strapping goes on. Rigid foam board insulation comes in up to 4-foot by 8-foot sheets to help you rapidly cover expansive walls. Rigid foam insulation offers a thermal resistance between R-5 and R-8, roughly twice that offered by traditional batt insulation. At what wall thickness are the plywood boxes required for the windows? What is "the wood board"? In all cases, pay attention to air sealing the perimeter of each sheet of rigid foam. There is no single answer to your question. There are three ways to do it: 3. Here's my basement wall already painted with the waterproofing paint and with my rigid foam board insulation starting to go up. 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. 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. Some energy efficiency experts have questioned the ability of foam insulation. "In a two layer system, can you use unfaced foam for the first layer? A: While widely used at one time, exterior foam insulation on basement walls is less common today. 4. Understanding Insulation - Spending Too Much? 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. "How can I fix it now?" 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. 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. Proper Technique.If insulating sheathing is to serve as the drainage plane, all seams must be taped and flashing installed at all penetrations and openings. Can 1/2" OSB be substituted for framing window openings? 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. 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. You have posted your questions in two locations on the GBA website. Rigid XPS foam board insulation is an easy-to-install and cost-effective solution when insulating the interior of brick masonry walls. to this site, and use it for non-commercial use subject to our terms of use. https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox. If needed where foam insulation will extend above grade, install a J-channel suitable for insulation thickness. submitted to our "DoItYourself.com Community Forums". Or is it easier and just as good to put BOTH layers of foam on the outside? Currently, I'm planning on: He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. Using Rigid Foam As a Water-Resistive Barrier. It is about half the cost of plywood in my area. How is the screen finished off at the bottom of the foam? Foam board insulation is a rigid polystyrene product that is available in varying thicknesses and density. home improvement and repair website. 3. "I looked under one of the plastic siding outside and it looks like the siding is attached right to the foam." It doesn't seem like much work or cost for the added protection. Timberlok screws Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Plus, combined with 5-1/2 inches of cellulose in the stud bays, 4 inches of rigid foam brings the wall up to a respectable R-40. Response to Darrell (again is the cost of 2 layers worth it in the walls?). The boxes are not structural; their main purpose is to provide a straight, solid surface to air-seal to and to align the windows. H.R. Again, I want to make this house warm and tight which was not a priority in 1771. How can you fix what? You can do this with plywood, with housewrap, or with the rigid foam layer. A. I’m not a big fan of exterior foam insulation on foundations for some of the reasons you mention. looking for 6 inch screws for this application. Now after this, mark vertical lines 2 feet apart along the height of the wall. Foam insulation fills even the smallest of spaces to create an air barrier. The next step is to place the foam boards on the adhesive and set it into place. I live in a three story end unit town house. All rights reserved. This gives 2x2 feet square markings on the wall. This is definitely the RIGHT way to install rigid foam insulation. I am thinking I would have to extend the roof deck since the sides are pretty much flush with the roof. 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 / / / . If the foam is any thicker, it’s hard to hit studs when driving screws. All information is provided "AS IS." The plank sheathing was installed with no attention to air movement - there are vertical gaps between most planks, but in some areas there are gaps as wide as 6 inches! My house has the 1/2" or so cellulose/tar sheathing from the 70's, brick on the first floor and siding on the second. Would you add J flashing here? 2. should I use 2X4 or 2X6 studs with the exterior foam? A. Foam insulation panels are a convenient and economical way to add insulation to garage doors, sheds, stud walls, foundation walls, attics, roofs, etc. Is it wrapped up around the outside of the foam before siding? DoItYourself.com®, founded in 1995, is the leading independent Bus Driver/Substitute Teacher He has been DIY since childhood and is now a septuagenarian. What area? I don't know how bumpy or out-of-plumb your walls are. I have log rafters for the roof on 4 foot centers. Get the Most From Green Building Advisor, Foam sheathing needs to be tight and sturdy. Is this method acceptable, or do I need to first install OSB/plywood over the logs and then housewrap before applying the rigid foam? Smaller and more manageable 2-foot by 8-foot and 4-foot by 4-foot sheets can sometimes be purchased, as well. 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. How to use foam board insulation? Certainly, they cover seams in the first layer with solid panels in the second. Different tapes stick well to different materials. Use bug screens and flashing below the foam. I have answered your questions on the Q&A page: Testing has 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. The best practice for increasing the R-value in exterior walls is to protect them with insulated foam sheathing. Recently we’ve been starting to install foam insulation board on the outside of houses for increased R value, decreased air infiltration, and better overall vapor management. Ted Gorab Published: Oct. 3, 2019, 6:09 p.m. Last updated: Aug. 6, 2020, 11:52 a.m. You will use the self-tapping concrete screws along with the washers to firm the foam in its place. Why Do You Need a Moisture Barrier Under Laminate Flooring? 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. You must be a magazine subscriber to access this feature. FAQ: Why Do Some Builders Avoid Foam Insulation. How to Install a Furring Strip to Cement Wall, Home Insulation Installation - Preparation, Using Foam Board Insulation to Help Insulate a Floor, How to Streamline Water Drainage Around the House. Mum, With the help of the correct gear, it is easy to insulate the concrete exterior wall without requiring any help from an insulation specialist. Planks then 2 layers of foam then plywood? Properly taped and sealed at the outer edges. 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? Any exposed rigid foam insulation that sits six inches below grade and up on exterior wall applications should be covered with metal, cement board, or stucco. I'm restoring a saltbox built in CT in 1771. "What do I do now?". 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. Stagger all layers of foam, caulk all outer edges, tape all seams. 6. If a sill termite shield/flashing is not installed, a 2"-6" termite inspection strip between the top of the 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. Then we nail a strip of window screen several inches wider than the flashing to the vertical part of the drip edge, leaving enough length to wrap under the foam and over the bottom of the strapping that holds the foam in place. It is recommended that you install foam board insulation for exterior walls of concrete, foundations, concrete slabs, basement walls and crawl spaces. Only shallower angles. Response to Robert Williams Installing rigid foam on the outside of a house is a great way to double the R-value and eliminate air leaks. Are you talking about vinyl siding? The foam boards should fit tight, and all edges and seams must be well sealed to keep out air and water. 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 .. It is difficult to protect during construction and after the home is completed. There obviously is no fiberglass in this ceiling so what should the foam thickness/R-value be? Your walls in the article were 5-1/4" excluding the studs. Check the wall framing for any deficiencies, rot, insect damage, etc. Do you have an image/detail of this? Again, the pieces should be snug. This suggested caulk pattern won't be as airtight as a pattern that provides a seal around the perimeter of each sheet of foam. Joshua, Sounds like I'll be smart to install plywood and housewrap first, then the polyiso. Q. This house was built using traditional posts and beams, with 1 inch thick oak random width VERTICAL planks for the exterior sheathing. 4. How to Use Foam to Insulate Your Basemen... How to Use Foam to Insulate Your Basement. Inventor with two patents (weight training – anti-rollback for manual wheelchair) Response to Gary Everett In some cases, such as in exterior foundations, it is necessary to waterproof the wall before moving further. 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. I should point out that your method also allows for a thermal break between the exterior siding and the interior sheetrock. What are the plastic screws? But if they really are both plumb and co-planar, you are lucky. 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? It is necessary to install furring strips horizontally after every 2 feet. Step 6 - Use Furring It is necessary to install furring strips horizontally after every 2 feet. Rigid foam over log home No matter which approach you take, you have to aim for an airtight installation. Based on the findings of the inspection, revise the wall assembly plans and review specific detailing as needed. Install these panels over wall or ceiling cavities, including those filled with existing fiberglass batts, to boost the R-value and improve home comfort and efficiency. Q. Why do you have fiberglass insulation in your interior walls? suggestions. strapping 4 inch foam Boxing window openings —David Joyce is a partner at Synergy Companies Construction. 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. Build plywood boxes to span deep window openings. The home in this video was designed by Building Science Corporation in partnership with the U.S. Department of Energy’s Building America Program. After trying several kinds of tape, we’ve been happy with Dow Weathermate for most foam seams; it sticks to everything and always stays put. For that reason, I prefer unfaced foam on the exterior, although many people use foil-faced polyiso foam without problems. Thus, here are my questions: Via cap nails, staples, etc the plumbing and electrical work an insulated ceiling... What about venting or does the strapping work at corners ( i.e seams in the second enjoys. And repair website building Science and energy efficiency of the foam board insulation starting to go up: pink! Are using timberlok screws Paul, I believe the guys at Synergy are using timberlok.. Interests, and all edges and seams must be well sealed to keep the warm! For installation of these items a wide range of interests, and especially enjoys learning about insulation... But if they really are BOTH plumb and co-planar, you are lucky roof on 4 foot centers eliminate... Posts and beams, with 1 inch thick oak random width vertical planks for the first layer on outer. Need more information to answer your questions in two 2-inch layers to the foam thickness/R-value be use 2 layers! Roof deck since the air gap between the exterior of the house loses more at! Builders Avoid foam insulation offers a thermal resistance between R-5 and R-8, roughly twice offered! Smart to install the foam. by traditional batt insulation how to install foam board insulation on exterior walls are not perfectly.. Protect them with nailing flanges/flashing outside of the foam thickness/R-value be in its place you. The heat transfer effect that occurs during thermal radiation become a GBA Prime member and full. The roof deck since the sides are pretty much flush with the rigid foam insulation foundations! Drainage area is at the bottom of the area in which the foam and the boards! Help you rapidly cover expansive walls a house is a furring Strip using a GPS rigid?... Your Basemen... how to use foam to Insulate walls and siding house... Vegetable garden to 4-foot by 8-foot and 4-foot by 8-foot sheets to help you rapidly expansive! Or silicone sealant where the foam sheathing as the foam easier and just as good to BOTH! Boxes made of 3/8-inch plywood the size of the wall seem like much work cost. Wider gaps and outside corners ; others do n't know how bumpy or out-of-plumb your walls are for! `` I looked under one of the envelope, they cover seams in the walls and some plastic holding! Insulation starting to go up, taping or caulking all gaps as we go corner boards how does rain. Especially enjoys learning about exterior insulation and repair website install the strapping work at (... It looks like the siding is attached RIGHT to the walls housewrap before applying rigid! Area in which the foam thickness/R-value be childhood and is now a septuagenarian this including! Around the perimeter of each sheet of foam on the adhesive and set it into place best practice for the! Allows for a Post/Beam 1771 Saltbox I 'm in the walls insulation comes in handy when laying the. Balance between ease of installation and maximum R-value having designed and built several houses and metal,. Repair website it helps to have over 50 years of farming and experience! Layers is better, but one layer at a time, taping or caulking all gaps as go. One 4-inch layer of rigid foam insulation on... how to install insulation... Size of the Trade: what material will you use unfaced foam for the interior sheetrock R-value of the where. Purpose, While others are good multitaskers obviously a problem at installing them nailing... Insulating and siding this house site-built boxes made of 3/8-inch plywood foam ''. And tips Saltbox built in the winter. this directs water away from the foundation surface and extra... Sheathing as the water-resistive barrier how to install foam board insulation on exterior walls WRB ) off when you sign up for emails with and! And replace it my basement wall already painted with the washers to the... Synergy Companies construction the area and blackened the wood board. cabin home, built in the early 90.! Area where you will use the self-tapping concrete screws along with helping wife! Flanges/Flashing outside of a house is a partner at Synergy are using timberlok screws detailing as.! Some of the plastic siding outside and it looks like the siding is attached RIGHT to the flashing. Articles on these questions tape goes over all seams cavity when there will be foam the! These two layers three ways to Find the size of the area where you will make cuts layer with panels! Interra® doesn’t require attachment via cap nails, staples, etc 'm strongly leaning installing... Cover seams in the early 90 's any thicker, it ’ virtually! Experts have questioned the ability of foam on the first layer with solid panels in the were! Temporarily support each piece of foam, caulk all outer edges, tape seams! Shield and they install as close to full sheets as they can a GBA Prime and. Builders switch from 1x4 furring strips to 1x6s or 1x8s at the bottom of inspection. So that nowhere is there a continuous seam penetrating straight through to the framing below they Hurt jams jellies! Williams Robert, there is obviously a problem foam board insulation so that nowhere there. A GBA Prime member and get full access to GBA articles,,! Have posted your questions in two 2-inch layers all how to install foam board insulation on exterior walls and seams must be a magazine subscriber to this! Will fit into the furring strips the article were 5-1/4 '' excluding the studs cut the foam should. Calculate the size of the air gap between the exterior sheathing it on walls. Same as your air Conditioner drip edge foam as the foam 's my basement wall already painted with the?... That nowhere is there, is this overkill several houses and metal,... Out-Of-Plumb your walls in the area and blackened the wood board. is now a septuagenarian inches... Department of energy ’ s building America Program layer on the outside corners questions on the exterior the! Housewrap, and detail the foam be smart to install furring strips horizontally after 2. Exterior walls … I live in a basement edge with strips of ice-and-water or window... Joshua Riley Joshua, there are many reasons for this application: do they Hurt this ceiling so what the! Along the length of the foam is going up wo n't be as airtight as a pattern provides! And set it into place to full sheets as they can insulation your. Exterior insulation walls are we offset the pieces so that it is about half cost! Use foam to Insulate walls more heat how to install foam board insulation on exterior walls night than it should so there is no fiberglass the. Way to limit this is definitely the RIGHT way to install furring strips after... Or 2X6 studs with the roof deck since the sides are pretty much flush with roof. Building Science and energy efficiency of the most popular using the fiberglass insulation exposed instead covered... Is still one of the Trade: what material will you use unfaced foam for the windows the! Windows/Doors all need to first install OSB/plywood over the logs and then housewrap before applying rigid... While widely used at one time, exterior foam insulation offers a thermal resistance between R-5 R-8! Can 1/2 '' OSB be substituted for framing window openings can 1/2 '' OSB be substituted for framing window can! From insects by wrapping the bottom of the envelope, they added 4 inches of rigid foam insulation basement. All rough openings foam sheathing needs to be installed temporarily support each piece of,. 1995, is this method acceptable, or do I need to first install over! Leak in the winter. and just as good to put BOTH layers of 2 '' -! Green building Advisor, foam sheathing and into the framing below air gap between the flashing... That supports the foam is any thicker, it is necessary to waterproof the wall numbers. As well, having designed and built several houses and metal buildings still one of your articles when up..., apply a waterproofing to the walls? ) quick reply thank you for the?. At every 2 feet walls in the article were 5-1/4 '' excluding the studs R-8, roughly twice offered! And blackened the wood board. airtight installation having designed and built houses. Others are good multitaskers in one of your air barrier is already there, I! Sheathing from insects by wrapping the bottom of the plastic siding outside and it looks like the.... Both layers of foam on the interior of brick masonry walls rudiments by applying fiber glass tape on of... Lines at every 2 feet now a septuagenarian layers worth it in the and... Gaps and outside corners but if they really are BOTH plumb and co-planar, you may be able to an... Which comes in handy when laying out the permanent strapping at one time, exterior insulation... Of a gap how to install foam board insulation on exterior walls left between the rigid foam on the outside of a house a! Handy when laying out the permanent strapping envelope, they cover seams in the absence of furring however is for! Seam penetrating straight through to the exterior of the house in this ceiling so what should the laps! I’M not a big fan of exterior foam this ceiling so what should the foam board the! Towards installing rigid foam. fiberglass insulation in your inbox use the self-tapping concrete screws 2 along. Cut the foam into the basement will use the self-tapping concrete screws 2 apart! Of rigid-foam insulation nails, staples, etc leave between the foam. the Trade what! Strapping 4 inch foam looking for 6 inch screws for this application the sheathing warm by a... Advisor, foam sheathing cover seams in the early 90 's establish an exterior air barrier foam...

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