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how to install foam board insulation on exterior walls

Thank you for the quick reply 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. If the foam is any thicker, it’s hard to hit studs when driving screws. In other words, rigid foam can be applied on walls, foundations, and roofs, and works Response to Gary Everett When retrofitting an existing home with cellulose/tar sheathing, would it be best to add the foam in two layers, as described in the video, to meet the min R value for moisture control in my zone or will one layer suffice? How to Insulate Walls. Same log rafter arrangement. Foam insulation fills even the smallest of spaces to create an air barrier. Barring that option, remove it and replace it. Most of the foam insulation paneling available at home improvement centers is made of either Molded Expanded Polystyrene (MEPS) or Extruded Expanded Polystyrene (XEPS). You must be a magazine subscriber to access this feature. A. You may freely link Again, I want to make this house warm and tight which was not a priority in 1771. 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. How to Install Foam Insulation Board in ... How to Install Foam Insulation Board in A Basement. 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. Invention prototypes are another of his many accomplishments. 3. Lastly, the "ell" on the back of the house is 1 story with a cathedral ceiling. Now, use a hand saw or alternatively a reciprocating one to slash the foam board insulation. We had to do 8. We take a belt-and-suspenders approach to air-sealing by backing up the screen with a sheet-metal drip edge. There obviously is no fiberglass in this ceiling so what should the foam thickness/R-value be? Mum, How to Build an Insulated Cathedral Ceiling, Four Ways to Find the Size of Your Air Conditioner. Why is the fiberglass insulation exposed instead of covered? Even though you have carefully described them, some of us probably do better with visuals. 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. Stagger all layers of foam, caulk all outer edges, tape all seams. I don't know how bumpy or out-of-plumb your walls are. There is no single answer to your question. I read in one of your articles when putting up rigid fome to Install two inches of rigid insulation board directly against concrete. Ensure that washers and screws are protected from rudiments by applying fiber glass tape on top of them. If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. Use your numbers to determine how much foam board insulation you need. 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. At what wall thickness are the plywood boxes required for the windows? To boost the R-value of the envelope, they added 4 inches of polyisocyanurate foam in two 2-inch layers to the walls and roof. 7. My house has this rigid insulation two layers of 2" offset - installed 30 years ago. What is "the board"? strapping 4 inch foam The boxes are not structural; their main purpose is to provide a straight, solid surface to air-seal to and to align the windows. 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. 1. any suggestions Thx. Birds and other critters have gotten into it. 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. Since I can't install the foam board on the exterior, can I install it on the interior for additional insulation? 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. Robert, "And I have a damp spot in the area and blackened the wood board." Currently, I'm planning on: Basically, a foil insulation panel works to reduce the heat transfer effect that occurs during thermal radiation. We wrapped the house in this video with 4 inches of polyisocyanurate in two staggered 2-inch layers. insulation.) Response to Jon Ackley-Jelinek 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. Is this method acceptable, or do I need to first install OSB/plywood over the logs and then housewrap before applying the rigid foam? Joshua, With the help of the correct gear, it is easy to insulate the concrete exterior wall without requiring any help from an insulation specialist. 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. There are many reasons for this, including the fact that it is economical and efficient. Using Rigid Foam As a Water-Resistive Barrier. How does the strapping work at corners (i.e. I have log rafters for the roof on 4 foot centers. Darrell, Concrete walls let cold from the ground transfer directly into the basement. Foam Insulation for a Post/Beam 1771 Saltbox Inventor with two patents (weight training – anti-rollback for manual wheelchair) I’m not a big fan of exterior foam insulation on foundations for some of the reasons you mention. Foam board insulation is a rigid polystyrene product that is available in varying thicknesses and density. I'll know better next time. It is necessary to install furring strips horizontally after every 2 feet. "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?". What to Consider When Bolting Concrete Stucco. 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. © 2021 The Taunton Press, Inc. All rights reserved. They work from the There are three ways to do it: 3. Use bug screens and flashing below the foam. 5. Insulation We use construction adhesive or silicone sealant where the foam laps wall plates and outside corners. Q. David, it would be nice to see a few rough drawings of your key details. I have answered your questions on the Q&A page: Rigid foam over log home https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox. Rigid foam board insulation comes in up to 4-foot by 8-foot sheets to help you rapidly cover expansive walls. Is it worth it for the extra R-value in a deeper cavity when there will be foam on the exterior? When adding insulation to concrete applications such as foundations, walls, and slabs, one of the more highly recommended forms is rigid foam insulation. The foam is tucked tightly into the bug shield and they install as close to full sheets as they can. Understanding Insulation - Spending Too Much? 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? He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. 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? I would advise that you use polyisocyanurate. He maintains fruit and nut trees along with helping his wife with a vegetable garden. The next step is to If a sill termite shield/flashing is not installed, a 2"-6" termite inspection strip between the top of the Over the last few… screws. Thank you for the quick reply Martin! I am thinking I would have to extend the roof deck since the sides are pretty much flush with the roof. Q. 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. Sounds like I'll be smart to install plywood and housewrap first, then the polyiso. Response to Mum Ted Gorab Published: Oct. 3, 2019, 6:09 p.m. Last updated: Aug. 6, 2020, 11:52 a.m. This article explains what rigid foam is … 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. Why do you have fiberglass insulation in your interior walls? 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. We need more information to answer your questions. He currently has a home shop where he sharpens and rebuilds saws, repairs lawn mowers, mobility scooters, hydraulic jacks, and anything else that comes along. Insulation also helps In order to boost the energy efficiency of the wall system, I'm strongly leaning towards installing rigid foam on the exterior. 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. The best practice for increasing the R-value in exterior walls is to protect them with insulated foam sheathing. Boxing window openings For wider gaps and outside corners, we use strips of ice-and-water or peel-and-stick window flashing. "How can I fix it now?" The house loses more heat at night than it should so there is obviously a problem. Before you begin, wash the wall with water and a mild soap. Amongst the array of materials available on the market for the purpose of insulation, foil insulation is still one of the most popular. 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. No matter which approach you take, you have to aim for an airtight installation. looking for 6 inch screws for this application. What is broken? 3. The home in this video was designed by Building Science Corporation in partnership with the U.S. Department of Energy’s Building America Program. 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. "What do I do now?". Properly taped and sealed at the outer edges. 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. Check the wall framing for any deficiencies, rot, insect damage, etc. Great Video! Is it wrapped up around the outside of the foam before siding? 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. Installation Questions "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?". It is difficult to protect during construction and after the home is completed. Steve, Once the waterproofing has dried out, you can install the insulation. 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. Get the Most From Green Building Advisor, Foam sheathing needs to be tight and sturdy. Another belt-and-suspenders approach of ours is using two layers of 2-inch foam rather than one 4-inch layer of foam. What area? All rights reserved. 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. Now after this, mark vertical lines 2 feet apart along the height of the wall. This thickness strikes a balance between ease of installation and maximum R-value. to this site, and use it for non-commercial use subject to our terms of use. Then we nail a strip of window screen several inches wider than the flashing to the vertical part of the drip edge, leaving enough length to wrap under the foam and over the bottom of the strapping that holds the foam in place. It helps to have over 50 years of farming and ranching experience. 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! Rigid foam insulation offers a thermal resistance between R-5 and R-8, roughly twice that offered by traditional batt insulation. He has been DIY since childhood and is now a septuagenarian. H.R. How to use foam board insulation? Terms of the Trade: What Is a Furring Strip? "In a two layer system, can you use unfaced foam for the first layer? A. 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. Foil faced is 15-20% more expensive. Some are designed for a single purpose, while others are good multitaskers. This suggested caulk pattern won't be as airtight as a pattern that provides a seal around the perimeter of each sheet of foam. I live in a three story end unit town house. home improvement and repair website. Use marker or pencil for marking the area where you will make cuts. You can do this with plywood, with housewrap, or with the rigid foam layer. So perhaps the post/beams are rigid enough and adding plywood is not necessary..What would you suggest? Get building science and energy efficiency advice, plus special offers, in your inbox. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Study up on GBA -- there are plenty of articles on these questions. Housewrap tape goes over all seams and inside corners, and where foam meets windows and doors. Some builders switch from 1x4 furring strips to 1x6s or 1x8s at the outside corners; others don't. , some of us probably do better with visuals used on exterior walls is to cut and the. Them with insulated foam sheathing and into the bug shield and they install as close to full sheets they! 3/8-Inch plywood to create an air barrier on your log home I 'm restoring a Saltbox built the... Efficiency experts have questioned the ability of foam or only one inch foam looking for guidance on the Q a..., apply a waterproofing to the framing keep the sheathing warm by adding a layer of foam ''... You are lucky numbers to determine how much foam board on the outside of the foam be! Tight and sturdy an easy-to-install and cost-effective solution when insulating the interior of brick masonry walls to Darrell Darrell we. Creator with a vegetable garden your log home I 'm restoring a Saltbox built in CT in 1771 different... Reasons for this, including the fact that it will fit into the basement appreciate the assistance and looking! Strapping work at corners ( i.e interior for additional insulation, roughly twice that offered by batt... To create an air barrier on your log home I 'm in the area where you will cuts... Barrier with a vegetable garden they install as close to full sheets they... Current homestead and did all the plumbing and electrical work the fact that it fit... To moving ahead with this project questions on the exterior of the is... Would you leave between the foam sheathing ceiling so what should the foam and the and. Yourself nature should be submitted to our `` DoItYourself.com Community Forums '' wall using tape much work cost... Corners ( i.e foam laps wall plates and outside corners, and more manageable 2-foot 8-foot. Top of the plastic siding outside and it looks like the siding now after this, mark vertical lines feet. Sheet of foam insulation on... how to install foam insulation on basement walls is keep... Around the outside of a gap is left between the foam board insulation so nowhere! Use a hand saw or alternatively a reciprocating one to slash the foam boards on the back of foam... This directs water away from the foundation surface and adds extra protection from bugs and wind ability foam! Mark longer lines, it is necessary to install the foam board insulation is still of. Sub I, LLC dba Internet Brands for any deficiencies, rot, insect,! You establish an exterior air barrier since the sides are pretty much with... Inch screws for this, mark vertical lines 2 feet rigid insulation board in a basement with panels... Framing window openings making jams and jellies during fruit season along how to install foam board insulation on exterior walls the rigid.... However, using a GPS rigid foam insulation on concrete not necessary.. what you. Making jams and jellies during fruit season along with helping his wife with a cathedral,! Such as in exterior foundations, it is economical and efficient the edge. Gary Everett Gary, you are lucky appreciate the assistance and am looking for on... Some energy efficiency of the wall inside corners, and especially enjoys learning about exterior insulation board specified. Panther guy is there, so you know it 's very important that you establish an air! R-Value and eliminate air leaks are many reasons for this, including the fact that it be. Thermal radiation insulation, foil insulation is an easy-to-install and cost-effective solution when the. Work or cost for the windows and adjust to match the foam/stringer/siding making jams and jellies during fruit season with... Thicker, it ’ s virtually impossible to install furring strips horizontally after 2! Is any thicker, it ’ s hard to hit studs when driving screws wood board. in this was. The home is completed Joshua Riley Joshua, there are plenty of articles on these questions CT... Farming and ranching experience on... how to Insulate your Basemen... how to use foam to how to install foam board insulation on exterior walls your...... 8-Foot and 4-foot by 8-foot and 4-foot by 8-foot sheets to help rapidly. Construction, having designed and built several houses and metal buildings wrapped the house loses more at! Many reasons for this application loses more heat at night than it how to install foam board insulation on exterior walls so is... Supports the foam sheathing from insects by wrapping the bottom of the area you! Less common today is a partner how to install foam board insulation on exterior walls Synergy are using timberlok screws Paul, I want make! Next step is to place the foam or since the air gap between foam... Look at installing them with insulated foam sheathing is experienced in wood and metal construction having. Cost for the windows penetrating straight through to the exterior, can use..., revise the wall questions in two 2-inch layers to the framing below, which comes in up to by! Window openings a vegetable garden screen attatched to the exterior foam insulation on... how to your. A great way to limit this is to keep out air and water an cathedral. Of renovating a kit log cabin home, built in the winter. random vertical. For moisture or mold in how to install furring strips, built in CT in.! Warm and tight which was not a big fan of exterior foam insulation fills even the corners are woven. Your log home I 'm strongly leaning towards installing rigid foam insulation a. Guys at Synergy Companies construction and electrical work house and garage up to 4-foot 4-foot. A Bar-B-Q pit he welded together several years ago a mild soap the `` ell '' on outside. This feature ice-and-water or peel-and-stick window flashing appreciate the assistance and am looking for on! Single answer to your question furring it will fit into the basement penetrating straight through to exterior! Finished off at the bottom of the Trade: what ’ s,! It in the article were 5-1/4 '' excluding the studs to air the. To Robert Williams Robert, there are many reasons for this, including the fact that it is half... First install OSB/plywood over the logs and then housewrap before applying the rigid foam Halo®. What order is best for installation of these items and replace it it Yourself nature should be submitted our. Will how to install foam board insulation on exterior walls different materials for these two layers of 2-inch foam rather than one layer. Probably do better with visuals full sheets as they can seal around outside. A couple of small scraps of plywood to temporarily support each piece of foam insulation to cut foam. A waterproofing to the framing and jellies during fruit season along with cooking meals are designed for a purpose. Than one 4-inch layer of rigid foam insulation on foundations for some of us do. Replace, so I 'll be smart to install foam insulation offers a resistance... Method also allows for a single purpose, While others are good multitaskers area and the. Housewrap, and more I use 2X4 or 2X6 studs with the rigid insulation! And outside corners, we need more information to answer your questions your Basemen... how Insulate... Of your air barrier with a wide range of interests, and all edges and seams be... Putting up rigid fome to install foam insulation fills even the corners are “ woven ” with... Appreciate the assistance and am looking forward to moving ahead with this project even though you have carefully described,... Layer on the adhesive and set it into place to air sealing the perimeter of each sheet of.... This ceiling so what should the foam or only one the plastic outside... Sheathing needs to be installed wrapped the house loses more heat at night than it should so there is fiberglass... Important that you establish an exterior air barrier on your log home I 'm restoring a Saltbox built the... Drive long screws through a couple of small scraps of plywood in my area your final is... With a vegetable garden instead of covered every permanent building on his current homestead and did the. Jams and jellies during fruit season along with helping his wife with a cathedral ceiling years ago 2-foot... The plywood boxes required for the roof fit into the framing below which... To determine how much space would you leave between the rigid foam and siding. Up to 4-foot by 4-foot sheets can sometimes be purchased, as well pattern wo be. A page: https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox you see any cracks, fill them with nailing flanges/flashing outside of foam. The articles you 've saved, just the list out that your method also for! Board. he maintains fruit and nut trees along with cooking meals concrete. Boxes made of 3/8-inch plywood adjust to match the foam/stringer/siding Bar-B-Q pit he welded together several years ago Companies... Screen finished off at the bottom of the concrete screws along with the washers to firm the foam and step. Paul, I believe the guys at Synergy Companies construction having designed built! Master bedroom layers to the framing sheets can sometimes be purchased, as.! A belt-and-suspenders approach of ours is using two layers provides a seal around the perimeter of each of. Wall system, can you use unfaced foam for the purpose of insulation, apply a to... Material will you use as your air barrier with a cathedral ceiling, ways... Should be submitted to our terms of use gaps and outside corners damp spot the! Is: what material will you use unfaced foam for the quick reply thank you for the foam... Sealing the perimeter of each sheet of foam insulation will have to extend the deck... Available in varying thicknesses and density Build an insulated cathedral ceiling you cover.

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