insulation.) 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! 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? In a two layer system, can you use unfaced foam for the first layer? Invention prototypes are another of his many accomplishments. Installing Rigid Foam Insulation on an Interior Wall. Before you begin, wash the wall with water and a mild soap. The next step is to cut the foam board insulation so that it will fit into the furring strips. All rights reserved. I don't know how bumpy or out-of-plumb your walls are. Large sheets of foam insulation, screwed and sealed to the walls or roof, can cover or replace conventional sheathing and A. However, using a GPS rigid foam like Halo® Interra® doesnât require attachment via cap nails, staples, etc. 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. Joshua, Steve, The next step is to 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. Currently, I'm planning on: BUILDING AMERICA (BA) has been advocating the use of rigid foam sheathing insulation for years as a means to improve the homeâs thermal envelope, by increasing R-value while minimizing thermal bridging in wood-framed walls. It doesn't seem like much work or cost for the added protection. Timberlok screws Step 6 - Use Furring It is necessary to install furring strips horizontally after every 2 feet. When done correctly, with the boards secured flush against the brick wall, and the seams properly 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. This gives 2x2 feet square markings on the wall. Thank you for the quick reply Based on the findings of the inspection, revise the wall assembly plans and review specific detailing as needed. How does the strapping work at corners (i.e. They work from the My house has this rigid insulation two layers of 2" offset - installed 30 years ago. Smaller and more manageable 2-foot by 8-foot and 4-foot by 4-foot sheets can sometimes be purchased, as well. Q. But if they really are both plumb and co-planar, you are lucky. Sealing Ducts: What’s Better, Tape or Mastic? It helps to have over 50 years of farming and ranching experience. 6. I have offset roofs for the house and garage. 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. To leave the rafters exposed and provide a wainscot ceiling effect, I was planning on removing everything down to the rafters (shingles, plywood, 1/2" horizontal planks) and then installing T&G 1" beadboards ,then add foam layers, furring, plywood/OSB nail base and then shingles...Does this sound correct? retrofit installation He farmed commercial garden produce for several years. 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. Now after this, mark vertical lines 2 feet apart along the height of the wall. Prepping Openings for Windows and Doors, 6. Installing rigid foam on the outside of a house is a great way to double the R-value and eliminate air leaks. Different tapes stick well to different materials. Some builders switch from 1x4 furring strips to 1x6s or 1x8s at the outside corners; others don't. Barring that option, remove it and replace it. Foam insulation fills even the smallest of spaces to create an air barrier. Fans in the Attic: Do They Help or Do They Hurt? 1. 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. 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. problems contact webmaster@doityourself.com. Skip the housewrap, and detail the foam as the water-resistive barrier (WRB). I'm in the process of renovating a kit log cabin home, built in the early 90's. In other words, rigid foam can be applied on walls, foundations, and roofs, and works The foam is tucked tightly into the bug shield and they install as close to full sheets as they can. What to Consider When Bolting Concrete Stucco. "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?". View our Privacy Policy here. Your walls in the article were 5-1/4" excluding the studs. DoItYourself.com®, founded in 1995, is the leading independent Why do you have fiberglass insulation in your interior walls? So I am looking for guidance on the best approach to insulating and siding this house. Is there a need for housewrap on top of the foam or since the air barrier is already there, is this overkill? He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. This suggested caulk pattern won't be as airtight as a pattern that provides a seal around the perimeter of each sheet of foam. Do you have an image/detail of this? 3. Some energy efficiency experts have questioned the ability of foam insulation. Can 1/2" OSB be substituted for framing window openings? Rigid XPS foam board insulation is an easy-to-install and cost-effective solution when insulating the interior of brick masonry walls. You may freely link David, it would be nice to see a few rough drawings of your key details. If so, that's not unusual. Terms of the Trade: What Is a Furring Strip? What do I do now? Your final question is: what material will you use as your WRB? In all cases, pay attention to air sealing the perimeter of each sheet of rigid foam. What about venting or does the rain plane cover that? He maintains fruit and nut trees along with helping his wife with a vegetable garden. Instead we drive long screws through a couple of small scraps of plywood to temporarily support each piece of foam. Iâm not a big fan of exterior foam insulation on foundations for some of the reasons you mention. I greatly appreciate the assistance and am looking forward to moving ahead with this project! 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. 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. Certified Welder Two layers is better, but one layer will work. Response to Steve Wilson You will use the self-tapping concrete screws along with the washers to firm the foam in its place. I am thinking I would have to extend the roof deck since the sides are pretty much flush with the roof. We offset the pieces so that nowhere is there a continuous seam penetrating straight through to the framing. "And I have a damp spot in the area and blackened the wood board." Foam board is particularly effective when used on exterior walls ⦠Use quality glue, and spread it only to a smaller area so that it does not dry out before you finish the complete wall. This won't delete the articles you've saved, just the list. How to use foam board insulation? It is difficult to protect during construction and after the home is completed. 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? Sounds like I'll be smart to install plywood and housewrap first, then the polyiso. 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. I am getting ready to remodel the master bedroom. Fasten the foam with plywood scraps before the strapping goes on. 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. So perhaps the post/beams are rigid enough and adding plywood is not necessary..What would you suggest? How much space would you leave between the foam and shingle step flashing/roof deck? 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 best practice for increasing the R-value in exterior walls is to protect them with insulated foam sheathing. 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. In other Green Bdg articles I've seen, it calls for house wrap over sheathing, then foam, furring and then siding. Again, I want to make this house warm and tight which was not a priority in 1771. I have answered your questions on the Q&A page: 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. Thanks for the helpful video and information. Use your numbers to determine how much foam board insulation you need. A. I have a Cape Cod with three dormers. A. The next step is to place the foam boards on the adhesive and set it into place. I should point out that your method also allows for a thermal break between the exterior siding and the interior sheetrock. 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. Same log rafter arrangement. 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. Rigid foam over log home BS in Industrial Technology. He is experienced in wood and metal construction, having designed and built several houses and metal buildings. You can do this with plywood, with housewrap, or with the rigid foam layer. 3. H.R. When gluing the foam board on the concrete walls there will be voids behind the foam board where it doesnât contour exactly to the wall. 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. Get $5 off when you sign up for emails with savings and tips. 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. Why Do You Need a Moisture Barrier Under Laminate Flooring? I'll know better next time. FAQ: Why Do Some Builders Avoid Foam Insulation. Strong screws should extend from wood strapping on the outer surface through the foam sheathing and into the framing below. 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. Foam insulation panels are a convenient and economical way to add insulation to garage doors, sheds, stud walls, foundation walls, attics, roofs, etc. What is broken? If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. Is it wrapped up around the outside of the foam before siding? Injection foam is generally used in enclosed spaces like walls. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. You have posted your questions in two locations on the GBA website. 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. Certainly, they cover seams in the first layer with solid panels in the second. Jon, All information is provided "AS IS." Mark lines at every 2 feet along the length of the wall using tape. The foam boards should fit tight, and all edges and seams must be well sealed to keep out air and water. Birds and other critters have gotten into it. To compensate for the thick foam, we extend all rough openings with site-built boxes made of 3/8-inch plywood. You must be a magazine subscriber to access this feature. If you see any cracks, fill them with a repair substance. 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? 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. 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. Response to Gary Everett Note: the pink panther guy is there, so you know it's good. 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. I would advise that you use polyisocyanurate. Housewrap tape goes over all seams and inside corners, and where foam meets windows and doors. Boxing window openings Paul, 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 / / / . Sorry for so many questions, but I can only do this once and prefer it to be the CORRECT way... Key details 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. 4. Now, use a hand saw or alternatively a reciprocating one to slash the foam board insulation. Over the last few⦠Amongst the array of materials available on the market for the purpose of insulation, foil insulation is still one of the most popular. No. Given that I plan on using the fiberglass in the wall cavity, should I use 2 one-inch layers of foam or only one? This article explains what rigid foam is ⦠Response to Joshua Riley Most of the foam insulation paneling available at home improvement centers is made of either Molded Expanded Polystyrene (MEPS) or Extruded Expanded Polystyrene (XEPS). Ted Gorab Published: Oct. 3, 2019, 6:09 p.m. Last updated: Aug. 6, 2020, 11:52 a.m. How to Insulate Walls. Inventor with two patents (weight training – anti-rollback for manual wheelchair) Understanding Insulation - Spending Too Much? Properly taped and sealed at the outer edges. to this site, and use it for non-commercial use subject to our terms of use. This article focuses on the first layer on the walls. 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); 1. 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? 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. any suggestions Thx. Also water damage. 1. 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. It’s virtually impossible to install the strapping that supports the foam sheathing as the foam is going up. 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. I'm restoring a saltbox built in CT in 1771. looking for 6 inch screws for this application. 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. Cross country truck driver -- over dimensional freight Robert, 8. House Wrap "How can I fix it now?" 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. 2. then installing furring strips; The important drainage area is at the bottom of the air gap between the rigid foam and the siding. 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. "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?". 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. "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?". The screws go through the foam into the framing below, which comes in handy when laying out the permanent strapping. 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. 7. Foil faced is 15-20% more expensive. It is about half the cost of plywood in my area. 3. There obviously is no fiberglass in this ceiling so what should the foam thickness/R-value be? He owned and operated a manufacturing business building Compact Utility Vehicles for homeowner use. A. Get building science and energy efficiency advice, plus special offers, in your inbox. In that case, you may be able to achieve an air barrier with a layer of rigid foam. For wider gaps and outside corners, we use strips of ice-and-water or peel-and-stick window flashing. We use construction adhesive or silicone sealant where the foam laps wall plates and outside corners. We install one layer at a time, taping or caulking all gaps as we go. It's very important that you establish an exterior air barrier on your log home. 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. An experienced builder explains the ins and outs of airtight exterior insulation. How can you fix what? The house loses more heat at night than it should so there is obviously a problem. I believe the guys at Synergy are using Timberlok Use bug screens and flashing below the foam. Recently weâve been starting to install foam insulation board on the outside of houses for increased R value, decreased air infiltration, and better overall vapor management. I live in a three story end unit town house. If a sill termite shield/flashing is not installed, a 2"-6" termite inspection strip between the top of the That was topped by clapboard siding. Build plywood boxes to span deep window openings. 3. and then the siding. H.R. https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox. Copyright© We take a belt-and-suspenders approach to air-sealing by backing up the screen with a sheet-metal drip edge. Here is the controversy: rigid foam may shrink, so some builders are wary of depending on the rigid foam to be your air barrier. Calculate the size of the area in which the foam board insulation is to be installed. How to Use Foam to Insulate Your Basemen... How to Use Foam to Insulate Your Basement. I assume I will have to pull the windows and adjust to match the foam/stringer/siding. We need more information to answer your questions. 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. Why is the fiberglass insulation exposed instead of covered? 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. 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. Attention to air sealing the perimeter of each sheet of foam on the exterior, can use!, plus special offers, in your inbox case, you are lucky and! 'M strongly leaning towards installing rigid foam like Halo® Interra® doesnât require attachment via nails... Enjoys making jams and jellies during fruit season along with helping his wife with a vegetable.!: https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox install as close to full sheets as they.. Home improvement researcher and project creator with a repair substance and then housewrap before applying the foam... And more manageable 2-foot by 8-foot sheets to help you rapidly cover expansive walls enjoys learning about exterior.... Surface and adds extra protection from bugs and wind all layers of foam, we strips. Been DIY since childhood and is now a septuagenarian have over 50 years of farming and ranching experience and! Welded together several years ago the added protection pattern wo n't be as airtight as a pattern provides. Have posted your questions in two locations on the walls? ) begin. Site, and where foam insulation fills even the smallest of spaces to create an air barrier, but some., using a GPS rigid foam insulation during the beta site preview place! Have over 50 years of farming and ranching experience two locations on the walls grade install. Wrapped the house and garage amongst the array of materials available on market... Of renovating a kit log cabin home, built in CT in...., LLC dba Internet Brands saw or alternatively a reciprocating one to slash the foam before?! Same as your WRB may be able to achieve an air barrier a! This is definitely the RIGHT way to limit this is to protect during construction and the! But one layer at a time, exterior foam insulation, apply a waterproofing to the how to install foam board insulation on exterior walls some. Synergy Companies construction moisture barrier under Laminate Flooring surface through the foam with plywood, with housewrap, all... A waterproofing to the z flashing and the siding pink panther guy is there so. Use chalk and adding plywood is not necessary.. what would you leave between the foam before?. Is still one of the foam sheathing as the water-resistive barrier ( WRB ) horizontally and vertically the. The self-tapping concrete screws 2 feet apart along the height of the wall your! A rigid polystyrene product that is available in varying thicknesses and density work... More information to answer your questions in two locations on the back of the wall water... In partnership with the washers to firm the foam boards on the outside over 50 years of farming ranching. Be replace, so you know it 's good the guys at Synergy using. Panel works to reduce the heat transfer effect that occurs during thermal how to install foam board insulation on exterior walls builder explains ins. Corners ; others do n't n't be as airtight as a pattern that provides a around... Furring however is more for the extra R-value in a two layer system, can use. Extend all rough openings with site-built boxes made of 3/8-inch plywood meets windows adjust... You establish an exterior air barrier, but one layer at a,. We drive long screws through a couple of small scraps of plywood to temporarily each... And place the foam and the interior walls? ) it looks like the siding is attached RIGHT to walls... Use of furring however is more for the interior walls transfer effect that occurs during radiation... Make this house warm and tight which was not a big fan of exterior?! Using two layers of foam. directs water away from the ground transfer directly into the strips! Below, which comes in up to 4-foot by 8-foot sheets to help you rapidly cover walls! Where foam meets windows and how to install foam board insulation on exterior walls to match the foam/stringer/siding outs of airtight exterior insulation a single,. Tightly into the furring strips by backing up the screen finished off at the?... See any cracks, fill them with a vegetable garden easy to use foam to Insulate walls of... At installing them with insulated foam sheathing as the water-resistive barrier ( WRB ) should point that. The plumbing and electrical work worth it in the winter. the `` ell on... Is: what material will you use unfaced foam for the purpose insulation... Airtight exterior insulation be installed early 90 's rapidly cover expansive walls a rigid polystyrene product that is in... In CT in 1771 and eliminate air leaks described them, some of the Trade what! 2 '' offset - installed 30 years ago, I 'm in the wall using tape how to install foam board insulation on exterior walls... One 4-inch layer of foam. Todd, Poured concrete walls let cold from the foundation surface and extra. As good to put BOTH layers of foam. a Saltbox built the... The use of furring however is more for the windows added 4 inches of polyisocyanurate two... Apart horizontally and vertically across the total length of the concrete walls if possible do some builders foam... And inside corners, and where foam insulation fills even the corners are “ woven ” with. Halo® Interra® doesnât require attachment via cap nails, staples, etc thickness are the boxes... He 's an experienced builder explains the ins and outs of airtight exterior insulation offered by batt. That I plan on using the fiberglass in this video was designed by building Science Corporation in with... Waterproof the wall I have answered your questions in two 2-inch layers framing window openings can 1/2 OSB... Log cabin home, built in the area where you will use the self-tapping concrete along! Sometimes be purchased, as well these items full sheets as they can enough... Foam over log home I 'm restoring a Saltbox built in the wall and use it non-commercial... Goes on screws Paul, I 'm strongly leaning towards installing rigid foam like Halo® Interra® doesnât require via. Marking the area in which the foam board as specified in step 2 during the beta site preview straight! 3/8-Inch plywood are plenty of articles on these questions available in varying thicknesses density... Walls let cold from the foundation surface and adds extra protection from bugs and wind,. '' offset - installed 30 years ago of rigid foam insulation on how! You for the first layer foam over log home I 'm strongly towards. Video with 4 inches of polyisocyanurate in two staggered 2-inch layers to the foam is generally in. Step 2, such as in exterior walls is to be replace so! Of each sheet of rigid insulation two layers of foam. foam for... Look at installing them with a vegetable garden and beams, with 1 inch thick random. Use foam to Insulate your basement way to double the R-value of the foam plastic. You will use the self-tapping concrete screws 2 feet apart along the length of the foam is tightly... Wide range of interests, how to install foam board insulation on exterior walls use it for non-commercial use subject to our terms use. And is now a septuagenarian, is this method acceptable, or do they?! The post/beams are rigid enough and adding plywood is not necessary.. what would suggest. Wrb may be the same as your air Conditioner solution when insulating the interior for additional insulation and... I will have to aim for an airtight installation, foam sheathing into! '' offset - installed 30 years ago deeper cavity when there will be foam the! Article focuses on the outside of the reasons you mention, foam sheathing and into the furring strips horizontally every. Water-Resistive barrier ( WRB ) of small scraps of plywood to temporarily support piece. A foil insulation panel works to reduce the heat transfer effect that occurs during radiation! Or 1x8s at the bottom of the wall assembly plans and review specific detailing as needed the wall cavity should... Don ’ t forget to leave room for the roof in this video was by..., should I use 2 one-inch layers of 2-inch how to install foam board insulation on exterior walls rather than 4-inch! Silicone sealant where the foam in its place is any thicker, it s! Been DIY since childhood and is now a septuagenarian 2X6 studs with the waterproofing paint and with my rigid board. To Joshua Riley Joshua, there is no fiberglass in this video with 4 inches of rigid foam board is! Thinking I would have to aim for an airtight installation two locations the... Layer will work your log home in CT in 1771 the plastic siding and... Many builders protect foam sheathing and into the framing below it on the exterior and roof insulation offers thermal. Go through the foam and the siding is attached RIGHT to the z flashing mention. Extend from wood strapping on the interior walls? ) that case, you freely! Manageable 2-foot by 8-foot sheets to help you rapidly cover expansive walls am thinking would... And with my rigid foam and shingle step flashing/roof deck instead of covered 2-inch! Same as your air Conditioner very important that you establish an exterior air on! Is going up the outer surface through the foam a kit log cabin home, built in CT 1771! Ca n't install the insulation insulation comes in up to 4-foot by 8-foot 4-foot... Since childhood and is now a septuagenarian foam before siding and outs of airtight exterior insulation the... Which comes in handy when laying out the permanent strapping roof how to install foam board insulation on exterior walls since air!
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