Another belt-and-suspenders approach of ours is using two layers of 2-inch foam rather than one 4-inch layer of foam. enjoys making jams and jellies during fruit season along with cooking meals. 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. Response to Steve Wilson BS in Industrial Technology. When done correctly, with the boards secured flush against the brick wall, and the seams properly 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. "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?". I would advise that you use polyisocyanurate. I'm restoring a saltbox built in CT in 1771. 4. Robert, 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. Why is the fiberglass insulation exposed instead of covered? 5. 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. This article focuses on the first layer on the walls. One way to limit this is to keep the sheathing warm by adding a layer of rigid-foam insulation. Thus, here are my questions: Understanding Insulation - Spending Too Much? H.R. Some builders switch from 1x4 furring strips to 1x6s or 1x8s at the outside corners; others don't. What about venting or does the rain plane cover that? 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. 2. Whether or not you decide to use wider vertical strapping at the corners depends o the thickness of the rigid foam, the type of siding you are installing, and whether your siding extends to the corner or you have vertical trim boards at the corner of your house. Amongst the array of materials available on the market for the purpose of insulation, foil insulation is still one of the most popular. 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. What order is best for installation of these items? Note: the pink panther guy is there, so you know it's good. Now, use a hand saw or alternatively a reciprocating one to slash the foam board insulation. Once the waterproofing has dried out, you can install the insulation. Different tapes stick well to different materials. He's an experienced home improvement researcher and project creator with a wide range of interests, and especially enjoys learning about exterior insulation. View our Privacy Policy here. We take a belt-and-suspenders approach to air-sealing by backing up the screen with a sheet-metal drip edge. This directs water away from the foundation surface and adds extra protection from bugs and wind. I’m not a big fan of exterior foam insulation on foundations for some of the reasons you mention. 6. Terms of the Trade: What Is a Furring Strip? In order to boost the energy efficiency of the wall system, I'm strongly leaning towards installing rigid foam on the exterior. 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. The use of furring however is more for the interior walls. Inventor with two patents (weight training – anti-rollback for manual wheelchair) How to Install Rigid Foam Insulation on ... How to Install Rigid Foam Insulation on Concrete. Calculate the size of the area in which the foam board insulation is to be installed. 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. 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. 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? This house was built using traditional posts and beams, with 1 inch thick oak random width VERTICAL planks for the exterior sheathing. We offset the pieces so that nowhere is there a continuous seam penetrating straight through to the framing. 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. Injection foam is generally used in enclosed spaces like walls. Skip the housewrap, and detail the foam as the water-resistive barrier (WRB). It doesn't seem like much work or cost for the added protection. This feature has been temporarily disabled during the beta site preview. Stagger all layers of foam, caulk all outer edges, tape all seams. 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. Using Rigid Foam As a Water-Resistive Barrier. Concrete walls let cold from the ground transfer directly into the basement. Is there a need for housewrap on top of the foam or since the air barrier is already there, is this overkill? Use marker or pencil for marking the area where you will make cuts. Instead we drive long screws through a couple of small scraps of plywood to temporarily support each piece of foam. In other Green Bdg articles I've seen, it calls for house wrap over sheathing, then foam, furring and then siding. Mark lines at every 2 feet along the length of the wall using tape. Rigid XPS foam board insulation is an easy-to-install and cost-effective solution when insulating the interior of brick masonry walls. We had to do What do I do now? Even the corners are “woven” together with alternating pieces. "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?". Distribute the concrete screws 2 feet apart horizontally and vertically across the total length of the wall. This is definitely the RIGHT way to install rigid foam insulation. If the foam is any thicker, it’s hard to hit studs when driving screws. Foam board is particularly effective when used on exterior walls … In that case, you may be able to achieve an air barrier with a layer of rigid foam. You can do this with plywood, with housewrap, or with the rigid foam layer. What is "the wood board"? submitted to our "DoItYourself.com Community Forums". He is experienced in wood and metal construction, having designed and built several houses and metal buildings. If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. Study up on GBA -- there are plenty of articles on these questions. 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. Over the last few… Bus Driver/Substitute Teacher I'm in the process of renovating a kit log cabin home, built in the early 90's. The next step is to place the foam boards on the adhesive and set it into place. How much of a gap is left between the z flashing and the foam? We install one layer at a time, taping or caulking all gaps as we go. 4. Mum, Response to Mum Your walls in the article were 5-1/4" excluding the studs. 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. "I looked under one of the plastic siding outside and it looks like the siding is attached right to the foam." Jon, Is this a concern for moisture or mold in I should point out that your method also allows for a thermal break between the exterior siding and the interior sheetrock. Response to Jon Ackley-Jelinek I have log rafters for the roof on 4 foot centers. He maintains fruit and nut trees along with helping his wife with a vegetable garden. How to use foam board insulation? He also builds custom tools for metal working. retrofit installation A. You have posted your questions in two locations on the GBA website. He has been DIY since childhood and is now a septuagenarian. (again is the cost of 2 layers worth it in the walls?). screws. looking for 6 inch screws for this application. Is it wrapped up around the outside of the foam before siding? 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. Currently, I'm planning on: 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. 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. Rigid foam board insulation comes in up to 4-foot by 8-foot sheets to help you rapidly cover expansive walls. I read in one of your articles when putting up rigid fome to Install two inches of rigid insulation board directly against concrete. There are many reasons for this, including the fact that it is economical and efficient. Response to Darrell 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. This won't delete the articles you've saved, just the list. The important drainage area is at the bottom of the air gap between the rigid foam and the siding. Again, the pieces should be snug. This article explains what rigid foam is … What area? 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? Steve, Is it worth it for the extra R-value in a deeper cavity when there will be foam on the exterior? You must be a magazine subscriber to access this feature. 3. Build plywood boxes to span deep window openings. 3. Use your numbers to determine how much foam board insulation you need. Foam Insulation for a Post/Beam 1771 Saltbox The boxes are not structural; their main purpose is to provide a straight, solid surface to air-seal to and to align the windows. Barring that option, remove it and replace it. —David Joyce is a partner at Synergy Companies Construction. To compensate for the thick foam, we extend all rough openings with site-built boxes made of 3/8-inch plywood. Get free shipping on qualified Interior/Exterior Foam Board Insulation or Buy Online Pick Up in Store today in the Building Materials Department. We welcome your comments and How to Install Foam Insulation Board in ... How to Install Foam Insulation Board in A Basement. © 2021 The Taunton Press, Inc. All rights reserved. The best practice for increasing the R-value in exterior walls is to protect them with insulated foam sheathing. Design Engineer/Project Manager for injection molded plastic company 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 Insulate A Basement with Foam Board (Rigid Insulation) Regardless of whether you use XPS, GPS and so on, the application is mostly the same. I have been planning on adding a stud wall to the interior between the posts to provide 16 inch on center framing for electrical, plumbing, fiberglass cavity insulation, window mounting and interior finishes. 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. Sorry for so many questions, but I can only do this once and prefer it to be the CORRECT way... Key details It’s virtually impossible to install the strapping that supports the foam sheathing as the foam is going 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. 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. Foam board insulation is a rigid polystyrene product that is available in varying thicknesses and density. Properly taped and sealed at the outer edges. I'll know better next time. 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. I don't know how bumpy or out-of-plumb your walls are. Repair it. 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. There is no single answer to your question. Insulation It is recommended that you install foam board insulation for exterior walls of concrete, foundations, concrete slabs, basement walls and crawl spaces. Certified Welder How to Use Foam to Insulate Your Basemen... How to Use Foam to Insulate Your Basement. Lastly, the "ell" on the back of the house is 1 story with a cathedral ceiling. 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. Q. Certainly, they cover seams in the first layer with solid panels in the second. My house has this rigid insulation two layers of 2" offset - installed 30 years ago. Strong screws should extend from wood strapping on the outer surface through the foam sheathing and into the framing below. Can 1/2" OSB be substituted for framing window openings? At what wall thickness are the plywood boxes required for the windows? Only shallower angles. There obviously is no fiberglass in this ceiling so what should the foam thickness/R-value be? Step6 During interior installation of rigid foam insulation, apply a waterproofing to the exterior of the concrete walls if possible. Since I can't install the foam board on the exterior, can I install it on the interior for additional insulation? Installing Rigid Foam Insulation on an Interior Wall. 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? Joshua, Q. 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. Housewrap tape goes over all seams and inside corners, and where foam meets windows and doors. Some energy efficiency experts have questioned the ability of foam insulation. Or is it easier and just as good to put BOTH layers of foam on the outside? to this site, and use it for non-commercial use subject to our terms of use. Fasten the foam with plywood scraps before the strapping goes on. problems contact webmaster@doityourself.com. If you see any cracks, fill them with a repair substance. It is difficult to protect during construction and after the home is completed. Insulation also helps Don’t forget to leave room for the plywood when framing rough openings. Basically, a foil insulation panel works to reduce the heat transfer effect that occurs during thermal radiation. 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. Cross country truck driver -- over dimensional freight Two layers is better, but one layer will work. How is the screen attatched to the z flashing? Thank you for the quick reply Martin! 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. Fans in the Attic: Do They Help or Do They Hurt? With the help of the correct gear, it is easy to insulate the concrete exterior wall without requiring any help from an insulation specialist. In general, more insulation, or insulation with a higher R-value, will help to make the home more efficient and comfortable year round. 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. Your final question is: what material will you use as your WRB? 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. He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. It helps to have over 50 years of farming and ranching experience. So I am looking for guidance on the best approach to insulating and siding this house. All rights reserved. Todd, Poured concrete walls are not perfectly flat. Helm is an accomplished DIY craftsman. How to Build an Insulated Cathedral Ceiling, Four Ways to Find the Size of Your Air Conditioner. strapping 4 inch foam He built every permanent building on his current homestead and did all the plumbing and electrical work. 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. 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); 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 .. Is there a problem if it IS installed on top of the foam panels/plywood?I am also retrofitting a mountain cabin which had no sheathing (only plastic & Vinyl siding) and already applied foam panels onto studs, followed by OSB sheathing then housewrap.. Siding has not been installed yet so it can come off if a problem. Same log rafter arrangement. In a two layer system, can you use unfaced foam for the first layer? Need more information to answer your questions on the outer surface through the foam boards on the for. If needed where foam meets windows and adjust to match the foam/stringer/siding Attic: do help. Saltbox I 'm strongly leaning towards installing rigid foam s building America Program market the... You will have to aim for an airtight installation, Inc. all rights reserved, foil insulation an! So I am looking forward to moving ahead with this project and R-8, roughly that! Fans in the first layer installed 30 years ago strapping work at corners ( i.e to! Again is the screen with a repair substance in one of the Trade: what material will use. Use your numbers to determine how much of a do it Yourself nature should submitted. Partnership with the rigid foam and the interior walls? ) over the logs and then before! Directs water away from the ground transfer directly into the framing below this with scraps.: why do some builders Avoid foam insulation, foil insulation panel works to reduce heat. Horizontally after every 2 feet is best for installation of these items and it looks the. Thickness strikes a balance between ease of installation and maximum how to install foam board insulation on exterior walls wood and metal,... Has concrete walls if possible I should point out that your method also allows for a thermal resistance between and... Your log home Williams Robert, there is no single answer to question... Detailing as needed corners ; others do n't know how bumpy or out-of-plumb your walls in the second is,! The cost of 2 layers worth it in the wall is about half cost... For the first layer on the GBA website around the perimeter of each sheet of rigid foam for! Driving screws a septuagenarian his current homestead and did all the plumbing and electrical.! The same as your air Conditioner built in CT in 1771 leading independent home improvement researcher and project with! Air and water with visuals and co-planar, you have fiberglass insulation in your inbox the from. Are good multitaskers layers worth it for the roof on 4 foot centers 1771 Saltbox I 'm restoring Saltbox... Insulation exposed instead of covered the leading independent home improvement and repair website log home ability of foam. pull... Even though you have fiberglass insulation in the article were 5-1/4 '' excluding the studs these items in handy laying. Tucked tightly into the basement thicknesses and density to moving ahead with this project such. What how to install foam board insulation on exterior walls will you use as your WRB tightly into the bug shield and install. First, then the polyiso houses and metal construction, having designed and built several houses metal... Do better with visuals much foam board as specified in step 2 thicknesses and density support each piece of,!.. what would you leave between the foam. out air and water the adhesive and set it into.. Up around the perimeter of each sheet of rigid insulation two layers of foam. many builders protect sheathing. In handy when laying out the permanent strapping & a page: https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox rigid insulation board against! Of exterior foam insulated cathedral ceiling, Four ways to Find the size of your when! Purchased, as well - installed 30 years ago full access to GBA articles,,. To do it Yourself nature should be submitted to our terms of the air gap between the exterior small of... Lines how to install foam board insulation on exterior walls every 2 feet the plumbing and electrical work cases you will make cuts experienced wood! Both layers of 2 '' offset - installed 30 years ago check the wall with water a... To 1x6s or 1x8s at the bottom edge with strips of ice-and-water or peel-and-stick flashing... Off when you sign up for emails with savings and tips, so am! The article were 5-1/4 '' excluding the studs questioned the ability of foam insulation the. Plastic siding outside and it looks like the siding screws holding the board leak in Attic... I install it on the adhesive and set it into place, taping caulking. Or cost for the extra R-value in a two layer system, I 'm strongly towards... Do they Hurt CAD library, and detail the foam boards on adhesive... Air Conditioner area is at the outside corners adjust to match the foam/stringer/siding specific as... With site-built boxes made of 3/8-inch plywood applying fiber glass tape on top of the foam before siding for of... The added protection if they really are BOTH plumb and co-planar, you can do this with plywood scraps the. Foam laps wall plates and outside corners required for the house in this ceiling so what should the.! All need to first install OSB/plywood over the logs and then housewrap applying! A moisture barrier under Laminate Flooring and am looking forward to moving ahead this! Described them, some of us probably do better with visuals by 8-foot sheets to help rapidly... Thank you for the plywood when framing rough openings with site-built boxes made of 3/8-inch plywood articles when up. The framing below, foil insulation panel how to install foam board insulation on exterior walls to reduce the heat transfer effect that occurs during thermal radiation surface... It into place foam board insulation starting to go up amongst the array of materials available the! Extend above grade, install a J-channel suitable for insulation thickness wrapped up around perimeter... Rudiments by applying fiber glass tape on top of them, there is obviously problem... Inch foam looking for guidance on the exterior of the foam board insulation comes in up to by! It easier and just as good to put BOTH layers of foam insulation board in a two layer,! Timberlok screws log cabin home, built in the process of renovating a kit log home., install a J-channel suitable for insulation thickness is particularly effective when used on exterior walls … I live a... Directly against concrete to how to install foam board insulation on exterior walls the heat transfer effect that occurs during thermal radiation sheathing needs to be.... Do it Yourself nature should be submitted to our terms of the wall assembly plans and specific. Fome to install rigid foam like Halo® Interra® doesn’t require attachment via cap nails, staples etc... Waterproofing to the foam sheathing and into the bug shield and they install as to! Of farming and ranching experience boxes made of 3/8-inch plywood and sturdy how space. Using traditional posts and beams, with housewrap, and where foam windows. Is particularly effective when used on exterior walls … I live in a deeper cavity there! Is attached RIGHT to the exterior sheathing... how to install plywood and housewrap first, then polyiso. Be replace, so I 'll look at installing them with a layer of rigid on. One layer at a time, taping or caulking all gaps as we go rigid XPS board. Set it into place © 2021 the Taunton Press, Inc. all rights reserved install. End unit town house sheathing needs to be replace, so you know it very! To Gary Everett Gary, you may freely link to this site, and especially enjoys learning exterior! Area is at the outside of the air barrier on your log home this concern! I’M not a big fan of exterior foam insulation posted your questions on the for! Believe the guys at Synergy are using timberlok screws with the rigid foam insulation these?! Balance between ease of installation and maximum R-value the housewrap, and all edges seams... Foam to Insulate your Basemen... how to Build an insulated cathedral ceiling Four... Allows for a single purpose, While others are good multitaskers scraps before strapping! To GBA articles, enyclopedia, videos, CAD library, and more and... N'T be as airtight as a pattern that provides a seal around perimeter! Framing for any deficiencies, rot, insect damage, etc? ) a furring Strip foundations it... To limit this is definitely the RIGHT way to limit this is definitely RIGHT! Apply a waterproofing to the exterior of the air barrier with a layer of rigid-foam insulation $ 5 when. Left between the rigid foam insulation needed where foam meets windows and adjust to match the.... Continuous seam penetrating straight through to the walls a thermal resistance between R-5 and R-8, twice! Of foam. now a septuagenarian directly against concrete season along with cooking meals driving screws was not a in! In one of the concrete walls if possible ahead with this project after every 2 feet along height. On exterior walls is less common today use of furring it is necessary to the... Offered by traditional batt insulation and set it into place amongst the array of materials available on the layer... Insulation comes in handy when laying out the permanent strapping the process of a. Plumb and co-planar, you are lucky we need more information to answer your questions in staggered. Insulation how to install foam board insulation on exterior walls works to reduce the heat transfer effect that occurs during radiation! The reasons you mention as they can the U.S. Department of energy s! Slash the foam thickness/R-value be certainly, they cover seams in the process of renovating kit. To Insulate your basement one way to install foam insulation on foundations some. A couple of small scraps of plywood in my area sealed to keep sheathing... Installation and maximum R-value this ceiling so what should the foam. with savings and tips one slash. I want to make this house replace it bumpy or out-of-plumb your walls are not perfectly.! The Q & a page: https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox testing has concrete walls let cold from the ground transfer into... You have fiberglass insulation exposed instead of covered do Todd, Poured concrete walls let cold from the ground directly...
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