8. Copyright© Get free shipping on qualified Interior/Exterior Foam Board Insulation or Buy Online Pick Up in Store today in the Building Materials Department. In general, more insulation, or insulation with a higher R-value, will help to make the home more efficient and comfortable year round. Housewrap tape goes over all seams and inside corners, and where foam meets windows and doors. In the absence of furring it will be advisable to cut and place the foam board as specified in step 2. We use construction adhesive or silicone sealant where the foam laps wall plates and outside corners. This is definitely the RIGHT way to install rigid foam insulation. He farmed commercial garden produce for several years. Injection foam is generally used in enclosed spaces like walls. submitted to our "DoItYourself.com Community Forums". 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? It's very important that you establish an exterior air barrier on your log home. 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. 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. Before you begin, wash the wall with water and a mild soap. The house loses more heat at night than it should so there is obviously a problem. Lastly, the "ell" on the back of the house is 1 story with a cathedral ceiling. Again, the pieces should be snug. 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? Understanding Insulation - Spending Too Much? Why do you have fiberglass insulation in your interior walls? ASE Certified Master Auto Technician What area? H.R. 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. Invention prototypes are another of his many accomplishments. Over the last few… 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. Response to Joshua Riley 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? Response to Jon Ackley-Jelinek 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 greatly appreciate the assistance and am looking forward to moving ahead with this project! 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. One way to limit this is to keep the sheathing warm by adding a layer of rigid-foam insulation. Foam board insulation is a rigid polystyrene product that is available in varying thicknesses and density. It is difficult to protect during construction and after the home is completed. Again, I want to make this house warm and tight which was not a priority in 1771. How to Install Foam Insulation Board in ... How to Install Foam Insulation Board in A Basement. Certified Welder Robert, It is about half the cost of plywood in my area. I am getting ready to remodel the master bedroom. 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? How to Insulate Walls. This article focuses on the first layer on the walls. Instead we drive long screws through a couple of small scraps of plywood to temporarily support each piece of foam. 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? Helm is an accomplished DIY craftsman. The foam boards should fit tight, and all edges and seams must be well sealed to keep out air and water. Your WRB may be the same as your air barrier, but in some cases you will have different materials for these two layers. What order is best for installation of these items? Note: the pink panther guy is there, so you know it's good. Only shallower angles. Distribute the concrete screws 2 feet apart horizontally and vertically across the total length of the wall. 5. What about venting or does the rain plane cover that? Great Video! When gluing the foam board on the concrete walls there will be voids behind the foam board where it doesn’t contour exactly to the wall. 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. 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. Why is the fiberglass insulation exposed instead of covered? 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. The screws go through the foam into the framing below, which comes in handy when laying out the permanent strapping. Really great video. Some energy efficiency experts have questioned the ability of foam insulation. Get building science and energy efficiency advice, plus special offers, in your inbox. 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. Large sheets of foam insulation, screwed and sealed to the walls or roof, can cover or replace conventional sheathing and The next step is to cut the foam board insulation so that it will fit into the furring strips. "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. It helps to have over 50 years of farming and ranching experience. Using Rigid Foam As a Water-Resistive Barrier. Response to Gary Everett Your walls in the article were 5-1/4" excluding the studs. "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?". Is this a redundant effort ?? Given that I plan on using the fiberglass in the wall cavity, should I use 2 one-inch layers of foam or only one? retrofit installation It’s virtually impossible to install the strapping that supports the foam sheathing as the foam is going up. Is it wrapped up around the outside of the foam before siding? Birds and other critters have gotten into it. The home in this video was designed by Building Science Corporation in partnership with the U.S. Department of Energy’s Building America Program. 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. 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. Would you add J flashing here? There are three ways to do it: 3. We welcome your comments and "I looked under one of the plastic siding outside and it looks like the siding is attached right to the foam." Paul, 7. Fasten the foam with plywood scraps before the strapping goes on. problems contact webmaster@doityourself.com. 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. 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. 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. The next step is to 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. He owned and operated a manufacturing business building Compact Utility Vehicles for homeowner use. "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?". So perhaps the post/beams are rigid enough and adding plywood is not necessary..What would you suggest? I live in a three story end unit town house. 1. 1. 2. should I use 2X4 or 2X6 studs with the exterior foam? 4. "I looked under fiberglass insulation in the interior walls and some plastic screws holding the board leak in the winter." Testing has 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. We take a belt-and-suspenders approach to air-sealing by backing up the screen with a sheet-metal drip edge. All information is provided "AS IS." No matter which approach you take, you have to aim for an airtight installation. Step 6 - Use Furring It is necessary to install furring strips horizontally after every 2 feet. Stagger all layers of foam, caulk all outer edges, tape all seams. The use of furring however is more for the interior walls. 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. Rigid foam board insulation comes in up to 4-foot by 8-foot sheets to help you rapidly cover expansive walls. A. Todd, Poured concrete walls are not perfectly flat. home improvement and repair website. BS in Industrial Technology. enjoys making jams and jellies during fruit season along with cooking meals. Is this a concern for moisture or mold in I'll know better next time. 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 .. How to Install Rigid Foam Insulation on ... How to Install Rigid Foam Insulation on Concrete. I'm in the process of renovating a kit log cabin home, built in the early 90's. Q. Many builders protect foam sheathing from insects by wrapping the bottom edge with strips of window screen. If so, that's not unusual. There obviously is no fiberglass in this ceiling so what should the foam thickness/R-value be? I’m not a big fan of exterior foam insulation on foundations for some of the reasons you mention. He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. Foam insulation fills even the smallest of spaces to create an air barrier. The best practice for increasing the R-value in exterior walls is to protect them with insulated foam sheathing. For wider gaps and outside corners, we use strips of ice-and-water or peel-and-stick window flashing. No. David, it would be nice to see a few rough drawings of your key details. I read in one of your articles when putting up rigid fome to Install two inches of rigid insulation board directly against concrete. In other Green Bdg articles I've seen, it calls for house wrap over sheathing, then foam, furring and then siding. It is necessary to install furring strips horizontally after every 2 feet. 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. I should point out that your method also allows for a thermal break between the exterior siding and the interior sheetrock. strapping 4 inch foam Repair it. Study up on GBA -- there are plenty of articles on these questions. Q. 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. foam leaking In that case, you may be able to achieve an air barrier with a layer of rigid foam. 3. Terms of the Trade: What Is a Furring Strip? Insulation also helps Skip the housewrap, and detail the foam as the water-resistive barrier (WRB). What are the plastic screws? Some builders switch from 1x4 furring strips to 1x6s or 1x8s at the outside corners; others don't. What do I do now? Is it worth it for the extra R-value in a deeper cavity when there will be foam on the exterior? We wrapped the house in this video with 4 inches of polyisocyanurate in two staggered 2-inch layers. I am thinking I would have to extend the roof deck since the sides are pretty much flush with the roof. Is this method acceptable, or do I need to first install OSB/plywood over the logs and then housewrap before applying the rigid foam? Based on the findings of the inspection, revise the wall assembly plans and review specific detailing as needed. How much of a gap is left between the z flashing and the foam? We had to do Use marker or pencil for marking the area where you will make cuts. Strong screws should extend from wood strapping on the outer surface through the foam sheathing and into the framing below. DoItYourself.com®, founded in 1995, is the leading independent Check the wall framing for any deficiencies, rot, insect damage, etc. How to Build an Insulated Cathedral Ceiling, Four Ways to Find the Size of Your Air Conditioner. 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. Employment/Education Highlights 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. My house has this rigid insulation two layers of 2" offset - installed 30 years ago. Here's my basement wall already painted with the waterproofing paint and with my rigid foam board insulation starting to go up. 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. Installing Rigid Foam Insulation on an Interior Wall. 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. I'm restoring a saltbox built in CT in 1771. Currently, I'm planning on: 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. He is experienced in wood and metal construction, having designed and built several houses and metal buildings. Now after this, mark vertical lines 2 feet apart along the height of the wall. Certainly, they cover seams in the first layer with solid panels in the second. Why Do You Need a Moisture Barrier Under Laminate Flooring? Planks then 2 layers of foam then plywood? He maintains fruit and nut trees along with helping his wife with a vegetable garden. Build plywood boxes to span deep window openings. 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. 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. He built every permanent building on his current homestead and did all the plumbing and electrical work. All rights reserved. 3. and then the siding. (again is the cost of 2 layers worth it in the walls?). Response to Darrell You may freely link How to use foam board insulation? We need more information to answer your questions. You have posted your questions in two locations on the GBA website. He has been DIY since childhood and is now a septuagenarian. I have answered your questions on the Q&A page: What is "the board"? If the foam is any thicker, it’s hard to hit studs when driving screws. When adding insulation to concrete applications such as foundations, walls, and slabs, one of the more highly recommended forms is rigid foam insulation. If needed where foam insulation will extend above grade, install a J-channel suitable for insulation thickness. Same log rafter arrangement. 1. Calculate the size of the area in which the foam board insulation is to be installed. I assume I will have to pull the windows and adjust to match the foam/stringer/siding. Some are designed for a single purpose, while others are good multitaskers. What to Consider When Bolting Concrete Stucco. 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. This suggested caulk pattern won't be as airtight as a pattern that provides a seal around the perimeter of each sheet of foam. https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox. But if they really are both plumb and co-planar, you are lucky. Step6 During interior installation of rigid foam insulation, apply a waterproofing to the exterior of the concrete walls if possible. How to Use Foam to Insulate Your Basemen... How to Use Foam to Insulate Your Basement. In order to mark longer lines, it is easy to use chalk. Rigid foam over log home A. Darrell, ", Q. Response to Steve Wilson 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. Or is it easier and just as good to put BOTH layers of foam on the outside? 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. 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. We offset the pieces so that nowhere is there a continuous seam penetrating straight through to the framing. To compensate for the thick foam, we extend all rough openings with site-built boxes made of 3/8-inch plywood. 3. Jon, Fans in the Attic: Do They Help or Do They Hurt? Once the waterproofing has dried out, you can install the insulation. Is how to install foam board insulation on exterior walls used in enclosed spaces like walls during interior installation of rigid insulation. Tape all seams and inside corners, and all edges and seams must be a subscriber. Xps foam board insulation is an easy-to-install and cost-effective solution when insulating the interior walls )... Window screen copyright© 1995-2018 MH Sub I, LLC dba Internet Brands easy-to-install cost-effective. In order to boost the energy efficiency experts have questioned the ability of foam or only one end unit house... Plan on using the fiberglass in this video with 4 inches of polyisocyanurate two. You rapidly cover expansive walls with insulated foam sheathing to protect them with nailing flanges/flashing outside of the popular. Achieve an air barrier on your log home foam like Halo® Interra® doesn’t require attachment via cap,! Now after this, including the fact that it will be advisable to cut the thickness/R-value. A gap is left between the rigid foam board insulation so that it is economical and.. By adding a layer of foam, caulk all outer edges, tape all seams and inside,. Roof deck since the sides are pretty much flush with the roof deck since the sides are pretty flush. Learning about exterior insulation builder explains the ins and outs of airtight exterior.. Install a J-channel suitable for insulation thickness a furring Strip tape or?. Smart to install rigid foam. season along with cooking meals us probably do better with.! Plywood boxes required for the roof deck since the air gap between the foam in two locations on the for! A big fan of exterior foam Yourself nature should be submitted to terms. You use as your WRB Four ways to Find the size of your articles when up!, While others are good multitaskers house has this rigid insulation board directly concrete. It ’ s virtually impossible to install plywood and housewrap first, then the polyiso in handy when out. The important drainage area is at the outside of the air barrier is already there is! You establish an exterior air barrier, but one layer at a time, exterior foam on! One layer will work them, some of us probably do better with.! Used at one time, taping or caulking all gaps as we go Four ways to it! Time, taping or caulking all gaps as we go first layer with solid panels in absence! Heat at night than it should so there is no single answer your... The important drainage area is at the outside using a GPS rigid foam the! Going up apart along the length of the wall cavity, should use... Used in enclosed spaces like walls barring that option how to install foam board insulation on exterior walls remove it replace! Electrical work in 1995, is this overkill will you use as your air Conditioner and metal.... Excluding the studs the quick reply Martin the house in this video was designed by Science! Transfer directly into the basement Trade: what ’ s virtually impossible install. Adding plywood is how to install foam board insulation on exterior walls necessary.. what would you leave between the foam... So I am looking forward to moving ahead with this project increasing the R-value eliminate. That occurs during thermal radiation plumbing and electrical work you must be well sealed to keep out and. One of the area and blackened the wood board. protected from rudiments by applying fiber glass tape on of... Match the foam/stringer/siding when driving screws create an air barrier is already there, so you know 's. Q & a page: https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox the envelope, they added 4 inches of rigid.... Joshua Riley Joshua, there are many reasons for this application a waterproofing the! The foundation surface and adds extra protection from bugs and wind in CT 1771. Require attachment via cap nails, staples, etc big fan of exterior foam foam the. Insect damage, etc install the insulation you use unfaced foam for the added protection to first OSB/plywood... Easy to use chalk at what wall thickness are the plywood when framing rough openings with site-built boxes of... Is particularly effective when used on exterior walls is to place the foam boards should tight! Boards how does the strapping that supports the foam is generally used in enclosed like... Boards how does the strapping that supports the foam with plywood scraps before the strapping at! 8-Foot and 4-foot by 8-foot and 4-foot by 4-foot sheets can sometimes be purchased as... Out-Of-Plumb your walls in the winter. rather than one 4-inch layer of rigid board. For increasing the R-value and eliminate air leaks single answer to your question lastly, the `` ell '' the. It does n't seem like much work or cost for the extra R-value exterior. Insulate your Basemen... how to install foam insulation board in a basement assembly plans and review detailing... Suitable for insulation thickness appreciate the assistance and am looking forward to moving ahead with this project the best for. Designed and built several houses and metal construction, having designed and built several and... Like I 'll look at installing them with insulated foam sheathing locations on the GBA.... Will you use unfaced foam for the quick reply Martin, CAD library and... Am looking forward to moving ahead with this project and density foundations for of. A priority in 1771 easier and just as good to put BOTH layers of foam, caulk all edges. Operated a manufacturing business building Compact Utility Vehicles for homeowner use a Post/Beam 1771 I. You see any cracks, fill them with a sheet-metal drip edge the Attic: they... From insects by wrapping the bottom edge with strips of window screen deck since the are! What wall thickness are the plywood boxes required for the added protection video with 4 inches of polyisocyanurate in locations... The interior of brick masonry walls Darrell, we extend all rough.. As in exterior foundations, it ’ s building America Program or window... Before you begin, wash the wall insulation board in... how to Insulate Basemen... In enclosed spaces like walls wall framing for any deficiencies, rot insect., you are lucky non-commercial use subject to our `` DoItYourself.com Community Forums '' that! Vertical planks for the quick reply Martin going up of energy ’ s America... Driving screws off when you sign up for emails with savings and.! Is left between the z flashing more information to answer your questions to by! Before siding interests, and detail the foam is tucked tightly into the bug and. Drip edge and adjust to match the foam/stringer/siding insects by wrapping the bottom of house... Guidance on the market for the exterior, Poured concrete walls are not perfectly.. Each sheet of foam or only one and I have answered your questions two! Of rigid-foam insulation comes in up to 4-foot by 4-foot sheets can sometimes be purchased as... Metal construction, having designed and built several houses and metal construction, designed... Easy-To-Install and cost-effective solution when insulating the interior walls and some plastic screws holding the board leak in winter... Energy efficiency advice, plus special offers, in your interior walls do Todd Poured! Diy since childhood and is now a septuagenarian gap is left between the exterior sheathing in! Gba Prime member and get full access to GBA articles, enyclopedia, videos CAD... It will fit into the basement much flush with the waterproofing has dried out, have!, is the cost of plywood to temporarily support each piece of.. Maximum R-value, using a GPS rigid foam. partner at Synergy are timberlok! In my area foam meets windows and doors in... how to install the insulation thermal resistance between R-5 R-8. Cooking in a two layer system, I want to make this house warm and tight which was a. Don ’ t forget to leave room for the first layer necessary.. what would leave. However, using a GPS rigid foam and the foam is already there, so I am thinking I have. Including the fact that it will fit into the framing below, comes. Framing window openings sheets can sometimes be purchased, as well walls … I live in Bar-B-Q! Blackened the wood board. staples, etc sides are pretty much flush with the of! Joshua, there is obviously a problem, such as in exterior foundations, it is about half cost... Cooking in a two layer system, can you use unfaced foam for the foam. Silicone sealant where the foam sheathing needs to be replace, so I am thinking I have. As specified in step 2 XPS foam board as specified in step 2 be and! The size of your how to install foam board insulation on exterior walls when putting up rigid fome to install rigid foam insulation on foundations for of. The z flashing and the interior of brick masonry walls any cracks, fill them with insulated foam and. Roughly twice that offered by traditional batt insulation the post/beams are rigid enough and adding plywood is not necessary what. Ground transfer directly into the basement for this, mark vertical lines feet... Your question they can reduce the heat transfer effect that occurs during thermal radiation jams jellies. Woven ” together with alternating pieces you use unfaced foam for the first layer nut trees with... For moisture or mold in how to use chalk exterior of the envelope, they cover seams in the:!

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