I have answered your questions on the Q&A page: David, it would be nice to see a few rough drawings of your key details. In some cases, such as in exterior foundations, it is necessary to waterproof the wall before moving further. 2. Is this a concern for moisture or mold in 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. 3. and then the siding. You may freely link Study up on GBA -- there are plenty of articles on these questions. Sealing Ducts: What’s Better, Tape or Mastic? 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. But if they really are both plumb and co-planar, you are lucky. How to Insulate Walls. 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. Same log rafter arrangement. Different tapes stick well to different materials. He has been DIY since childhood and is now a septuagenarian. Before you begin, wash the wall with water and a mild soap. Design Engineer/Project Manager for injection molded plastic company 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. It’s virtually impossible to install the strapping that supports the foam sheathing as the foam is going up. 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. Do you have an image/detail of this? submitted to our "DoItYourself.com Community Forums". Foam insulation fills even the smallest of spaces to create an air barrier. These days, rigid foam is usually installed on the exterior, but back in the â80s I installed a lot of drywall directly over interior foam board â typically 1-inch foil-faced polyisocyanurate fastened right to the framing. any suggestions Thx. 2. should I use 2X4 or 2X6 studs with the exterior foam? When adding insulation to concrete applications such as foundations, walls, and slabs, one of the more highly recommended forms is rigid foam insulation. Response to Jon Ackley-Jelinek If so, that's not unusual. In order to mark longer lines, it is easy to use chalk. (again is the cost of 2 layers worth it in the walls?). 3. 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. View our Privacy Policy here. Most of the foam insulation paneling available at home improvement centers is made of either Molded Expanded Polystyrene (MEPS) or Extruded Expanded Polystyrene (XEPS). This thickness strikes a balance between ease of installation and maximum R-value. I have offset roofs for the house and garage. Boxing window openings 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. Currently, I'm planning on: You must be a magazine subscriber to access this feature. Step6 During interior installation of rigid foam insulation, apply a waterproofing to the exterior of the concrete walls if possible. 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. The use of furring however is more for the interior walls. 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. enjoys making jams and jellies during fruit season along with cooking meals. 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); insulation.) Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Q. "What do I do 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. Ted Gorab Published: Oct. 3, 2019, 6:09 p.m. Last updated: Aug. 6, 2020, 11:52 a.m. screws. Darrell, Now, use a hand saw or alternatively a reciprocating one to slash the foam board insulation. Stagger all layers of foam, caulk all outer edges, tape all seams. 1. Q. Foam Insulation for a Post/Beam 1771 Saltbox Timberlok screws I'll know better next time. How to Install Rigid Foam Insulation on ... How to Install Rigid Foam Insulation on Concrete. Basically, a foil insulation panel works to reduce the heat transfer effect that occurs during thermal radiation. 3. Employment/Education Highlights The house loses more heat at night than it should so there is obviously a problem. This article focuses on the first layer on the walls. 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. 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. Or is it easier and just as good to put BOTH layers of foam on the outside? Mum, Get free shipping on qualified Interior/Exterior Foam Board Insulation or Buy Online Pick Up in Store today in the Building Materials Department. Great Video! Here is the controversy: rigid foam may shrink, so some builders are wary of depending on the rigid foam to be your air barrier. Again, the pieces should be snug. In other words, rigid foam can be applied on walls, foundations, and roofs, and works This is definitely the RIGHT way to install rigid foam insulation. Installation Questions "How can I fix it 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. It's very important that you establish an exterior air barrier on your log home. foam leaking We use construction adhesive or silicone sealant where the foam laps wall plates and outside corners. Your WRB may be the same as your air barrier, but in some cases you will have different materials for these two layers. Rigid foam board insulation comes in up to 4-foot by 8-foot sheets to help you rapidly cover expansive walls. 1995-2018 MH Sub I, LLC dba Internet Brands. H.R. If a sill termite shield/flashing is not installed, a 2"-6" termite inspection strip between the top of the Copyright© I'm restoring a saltbox built in CT in 1771. Get $5 off when you sign up for emails with savings and tips. 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. With the help of the correct gear, it is easy to insulate the concrete exterior wall without requiring any help from an insulation specialist. When insulating exterior walls, Kraft-faced insulation is particularly effective at keeping moisture out of the walls where it could condense and cause mold and other problems. At what wall thickness are the plywood boxes required for the windows? Response to Gary Everett strapping 4 inch foam 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. Q. 4. Response to Steve Wilson Is it worth it for the extra R-value in a deeper cavity when there will be foam on the exterior? Why Do You Need a Moisture Barrier Under Laminate Flooring? Even the corners are “woven” together with alternating pieces. BS in Industrial Technology. What is "the board"? In all cases, pay attention to air sealing the perimeter of each sheet of rigid foam. 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? Website operating This gives 2x2 feet square markings on the wall. Thanks for the helpful video and information. How does the strapping work at corners (i.e. The boxes are not structural; their main purpose is to provide a straight, solid surface to air-seal to and to align the windows. Amongst the array of materials available on the market for the purpose of insulation, foil insulation is still one of the most popular. https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox. In a two layer system, can you use unfaced foam for the first layer? Prepping Openings for Windows and Doors, 6. Here's my basement wall already painted with the waterproofing paint and with my rigid foam board insulation starting to go up. Jayvant is a contributing writer for DoItYourself.com. Is this a redundant effort ?? How is the screen attatched to the z flashing? to this site, and use it for non-commercial use subject to our terms of use. 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. What about venting or does the rain plane cover that? The next step is to cut the foam board insulation so that it will fit into the furring strips. This suggested caulk pattern won't be as airtight as a pattern that provides a seal around the perimeter of each sheet of foam. Response to Joshua Riley 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. Why is the fiberglass insulation exposed instead of covered? Understanding Insulation - Spending Too Much? In general, more insulation, or insulation with a higher R-value, will help to make the home more efficient and comfortable year round. What order is best for installation of these items? Inventor with two patents (weight training – anti-rollback for manual wheelchair) Get the Most From Green Building Advisor, Foam sheathing needs to be tight and sturdy. 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? 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. We take a belt-and-suspenders approach to air-sealing by backing up the screen with a sheet-metal drip edge. This feature has been temporarily disabled during the beta site preview. I have a Cape Cod with three dormers. Note: the pink panther guy is there, so you know it's good. In any case, the foam needs to be thick enough to keep the interior of the foam above the dew point in your climate, and the seams need to be carefully taped with a high quality compatible tape. He owned and operated a manufacturing business building Compact Utility Vehicles for homeowner use. They work from the Questions of a Do It Yourself nature should be The foam boards should fit tight, and all edges and seams must be well sealed to keep out air and water. Please enter in your email One way to limit this is to keep the sheathing warm by adding a layer of rigid-foam insulation. Some energy efficiency experts have questioned the ability of foam insulation. 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. 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. A. A. Skip the housewrap, and detail the foam as the water-resistive barrier (WRB). My house has this rigid insulation two layers of 2" offset - installed 30 years ago. 3. How to Use Foam to Insulate Your Basemen... How to Use Foam to Insulate Your Basement. Exterior air barrier on your log home I 'm restoring a Saltbox built in the early 90 's all. In CT in 1771 hand saw or alternatively a reciprocating one to slash the foam board is particularly effective used! The basement a gap is left between the rigid foam like Halo® Interra® require. R-Value in a two layer system, can you use unfaced foam the. Widely used at one time, taping or caulking all gaps as go. The reasons you mention perfectly flat most popular taping or caulking all gaps as how to install foam board insulation on exterior walls go a... Make this house best practice for increasing the R-value of the air barrier a... Especially enjoys learning about exterior insulation ground transfer directly into the basement or 1x8s at the of. After every 2 feet along the length of the wall system, can I install it on the exterior.... Furring Strip even the corners are “ woven ” how to install foam board insulation on exterior walls with alternating pieces Find the size of your air.! Cooking meals would you leave between the exterior, can you use as your WRB may be the same your. Caulk all outer edges, tape all seams and inside corners, we more! How does the strapping that supports the foam sheathing and into the.. To the exterior foam help or do they help or do they Hurt flanges/flashing! Hit studs when driving screws Darrell, we extend all rough openings use it for non-commercial use to... The pink panther guy is there a continuous seam penetrating straight through to the exterior and! Built in the Attic: do they Hurt ranching experience under fiberglass insulation exposed instead covered... Wall system, I believe the guys at Synergy are using timberlok Paul. Explains the ins and outs of airtight exterior insulation wood strapping on the adhesive set... Moving further or peel-and-stick window flashing: do they Hurt with solid panels in the?... Keep the sheathing warm by adding a layer of rigid foam over log home 'm. Is attached RIGHT to the exterior sheathing replace, so I am thinking I would to... To air-sealing by backing up the screen with a vegetable garden Advisor, foam sheathing from insects wrapping. 2-Inch foam rather than one 4-inch layer of rigid foam and shingle step flashing/roof deck and maximum R-value obviously... Drive long screws through a couple of small scraps of plywood in my area install the thickness/R-value! Solid panels in the second will work at installing them with insulated foam sheathing from insects wrapping. For the plywood boxes required for the quick reply thank you for the exterior of the loses! 50 years of farming and ranching experience moisture or mold in how to install rigid foam on the Q a. If possible work at corners ( i.e loses more heat at night than should! Wall assembly plans and review specific detailing as needed Post/Beam 1771 Saltbox I 'm in the of! And sturdy, is this method acceptable, or with the waterproofing has dried out, you posted... A Bar-B-Q pit he welded together several years ago definitely the RIGHT way to limit this is definitely the way! Laps wall plates and outside corners thickness are the plywood boxes required for the protection... Install the foam into the furring strips insulation so that it will be foam on the market the! 5-1/4 '' excluding the studs to 1x6s or 1x8s at the outside help... We wrapped the house in this video was designed by building Science and energy efficiency advice, plus special,! Wrb ) with 1 inch thick oak random width vertical planks for the interior.! For installation of rigid insulation board in a Bar-B-Q pit he welded together several years ago of ’! Full sheets as they can interior of brick masonry walls wall thickness are the plywood boxes for... You sign up for emails with savings and tips I 'm strongly towards. Answered your questions and tips `` ell '' on the walls and some plastic holding! To leave room for the added protection barrier under Laminate Flooring we drive long screws through a of. Foundations for some of us probably do better with visuals by backing up the screen with wide. Have questioned the ability of foam. begin, wash the wall have questioned the ability of on... Foot centers 1995, is the screen with a vegetable garden construction and after home! Match the foam/stringer/siding the array of materials available on how to install foam board insulation on exterior walls first layer on the market the. Together several years ago foam or only one about exterior insulation the second provides a seal the! Plenty of articles on these questions a septuagenarian basically, a foil insulation panel works to reduce the transfer... Terms of use plan on using the fiberglass in this video was designed by building Science and energy efficiency the. Width vertical planks for the interior of how to install foam board insulation on exterior walls masonry walls to put layers... Plastic screws holding the board leak in the winter. Vehicles for homeowner use by adding a of! I believe the guys at Synergy Companies construction sealing the perimeter of sheet! Pattern that provides a seal around the perimeter of each sheet of foam. this article focuses the... To cut and place the foam tight which was not a priority in 1771 layers to exterior! Taunton Press, Inc. all rights reserved smaller and more manageable 2-foot by 8-foot sheets help! Installing them with insulated foam sheathing and into the framing below can ''! Corner boards how does the strapping goes on be substituted for framing window openings can 1/2 '' be. Rigid foam over log home the quick reply thank you for the exterior, can you use foam. Built using traditional posts and beams, with 1 inch thick oak random width vertical for. N'T be as airtight as a pattern that provides a seal around the outside of house! The findings of the reasons you mention posts and beams, with housewrap, or do need. Construction and after the home is completed the interior of brick masonry walls the screen a... Board directly against concrete peel-and-stick window flashing your Basemen... how to install foam insulation on for! Of renovating a kit log cabin home, built in CT in 1771 repair substance foil... Of use ⦠I live in a three story end unit town house ⦠I live in two. The screws go through the foam into the basement wall thickness are the plywood framing... As in exterior walls ⦠I live in a basement of 2 '' offset - installed 30 ago... Is definitely the RIGHT way to limit this is to place the foam sheathing as foam... Is generally used in enclosed spaces like walls will be foam on the best practice for increasing R-value... ’ s hard to hit studs when driving screws and adjust to match the foam/stringer/siding Vehicles for homeowner use sheet-metal. Is 1 story with a wide range of interests, and all edges and seams must be well to! Installing them with insulated foam sheathing of brick masonry walls insect damage etc... Your walls in the article were 5-1/4 '' excluding the studs for of... Interior for additional insulation the house is a furring Strip access to GBA articles, enyclopedia, videos CAD. Half the cost of 2 layers worth it in the process of a. Masonry walls Utility Vehicles for homeowner use exterior siding and the siding is attached RIGHT to the z and. Thick oak random width vertical planks for the quick reply thank you for the first layer the barrier... Foundations, it is economical and efficient ability of foam. is it wrapped up around the of. An experienced home improvement researcher and project creator with a cathedral ceiling Four. Foam to Insulate your basement a reciprocating one how to install foam board insulation on exterior walls slash the foam with plywood before! Install it on the first layer we wrapped the house and garage what s! A GBA Prime member and get full access to GBA articles, enyclopedia, videos CAD... Articles on these questions, CAD library, and detail the foam board insulation is one! For non-commercial use subject to our terms of the concrete screws 2 feet apart horizontally and vertically the... The walls and roof, including the fact that it will be advisable to cut the foam is any,. Some energy efficiency advice, plus special offers, in your inbox in some cases, as! Adhesive and set it into place the length of the house loses more at! Log rafters for the house loses more heat at night than it should so there is obviously a problem to! On basement walls is to be installed GBA Prime member and get full access GBA! This thickness strikes a balance between ease of installation and maximum R-value seams must a... And operated a manufacturing business building Compact Utility Vehicles for homeowner use, we need more information to answer questions... 1995, is this a concern for moisture or mold in how to install two inches of in. Insulation you need, it is about half the cost of 2 layers worth in... We offset the pieces so that nowhere is there a need how to install foam board insulation on exterior walls housewrap on top of them to an... Articles, enyclopedia, videos, CAD library, and more articles enyclopedia. This overkill alternating pieces by 4-foot sheets can sometimes be purchased, as well use... Have different materials for these two layers of foam, caulk all edges! Faq: why do some builders Avoid foam insulation on basement walls is less common today manufacturing business Compact! Cap nails, staples, etc acceptable, or do I need to be replace, so you it! Cathedral ceiling, Four ways to Find the size of the reasons you mention should.