how to install foam board insulation on exterior walls

Shop this Collection (383) Model# 20WE $ 19 55. 3. Foam board + backed fiberglass insulation -- bad? How is the screen attatched to the z flashing? 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. Really great video. Use bug screens and flashing below the foam. No matter which approach you take, you have to aim for an airtight installation. Sorry for my book and I very much appreciate any responses! This directs water away from the foundation surface and adds extra protection from bugs and wind. Response to Mum screws. Sealing Ducts: What’s Better, Tape or Mastic? Check the wall framing for any deficiencies, rot, insect damage, etc. Some builders use 1/2-inch wood sheathing (R-0.6) or asphalt impregnated sheathing, usually called blackboard (R-1.3) to sheath the walls. We use construction adhesive or silicone sealant where the foam laps wall plates and outside corners. x 4 ft. x 8 ft. R-5 Scored Square Edge Rigid Foam Board Insulation Sheathing. 4. Your walls in the article were 5-1/4" excluding the studs. Lastly, the "ell" on the back of the house is 1 story with a cathedral ceiling. What is broken? What are the plastic screws? 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. All rights reserved. There obviously is no fiberglass in this ceiling so what should the foam thickness/R-value be? Foundation Wall – Exterior • Prior to backfi lling, install FOAMULAR® Insulation to the exterior, from top of footing to the full height of the foundation wall. If using batt insulation, select the appropriate size for your wall cavities and the right R-value for your project. Some are designed for a single purpose, while others are good multitaskers. What do I do now? Questions of a Do It Yourself nature should be Most of the foam insulation paneling available at home improvement centers is made of either Molded Expanded Polystyrene (MEPS) or Extruded Expanded Polystyrene (XEPS). ), 50 mm x 76 mm (2 in. There are three ways to do it: 3. 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. Ensure that washers and screws are protected from rudiments by applying fiber glass tape on top of them. Is there a need for housewrap on top of the foam or since the air barrier is already there, is this overkill? Cement. Why do you have fiberglass insulation in your interior walls? This can make for a wavy wall, so when it is time to install siding, the crew will pull a string line across the wall and either drive in or back out the screws. Understanding Insulation - Spending Too Much? Q. Barring that option, remove it and replace it. The important drainage area is at the bottom of the air gap between the rigid foam and the siding. What order is best for installation of these items? Colder climates require a thicker layer of foam. 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. BY DAVID JOYCE. I'm restoring a saltbox built in CT in 1771. Ted Gorab Published: Oct. 3, 2019, 6:09 p.m. Last updated: Aug. 6, 2020, 11:52 a.m. How is the screen finished off at the bottom of the foam? One way to limit this is to keep the sheathing warm by adding a layer of rigid-foam insulation. Project house weekly wrap episode 5 housewrap and exterior foam continuous rigid insulation sheathing siding building america measure guideline incorporating thick layers of exterior rigid advanced frame wall construction building science corp rigid foam insulation installed between existing house and garage rigid foam insulation for existing exterior walls building. Choose fiberglass insulation batting. Oriented Strand Board Exterior Wall Sheathing (OSB) Oriented strand board, or OSB, is a popular and … Some builders switch from 1x4 furring strips to 1x6s or 1x8s at the outside corners; others don't. In other Green Bdg articles I've seen, it calls for house wrap over sheathing, then foam, furring and then siding. Part 1: Prepare a Rough Opening for a Nail-Fin Window Over Exterior Rigid-Foam Insulation. To serve as a drainage plane, the seams in the foam sheathing must be properly taped with sheathing and flashing tapes to provide continuity of the drainage plane at joints between panels. When z-furring is used to secure the insulation sheathing, is it still considered to be continuous? Also water damage. Polystyrene foam boards, commonly called foamboard, are a clean, lightweight, convenient way to insulate bare concrete walls. Exterior Foam Board – This is probably the most common approach to exterior foam insulation. By using a 1/2-inch foam insulated sheathing (R-2 to R-3.5) in combination with wall cavity insulation, the total R-value of the exterior wall will be increased, contributing to greater energy efficiency. How to Install Rigid Foam Board Insulation at Exterior Wall. Cut your polyurethane foam board insulation to fit these measurements. 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. Response to Jon Ackley-Jelinek "How can I fix it now?" Home insulation saves you money by keeping your home warm in the winter and cool in the summer. Best for floors, foundation and basement walls, interior and exterior wall sheathing and low-sloped ceilings. Many builders protect foam sheathing from insects by wrapping the bottom edge with strips of window screen. The only exterior below grade insulation that I have found to be self draining is the mineral fiberglass insulation. We need more information to answer your questions. A. Housewrap tape goes over all seams and inside corners, and where foam meets windows and doors. Another belt-and-suspenders approach of ours is using two layers of 2-inch foam rather than one 4-inch layer of foam. Joshua, —David Joyce is a partner at Synergy Companies Construction. Are you talking about vinyl siding? 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. Foam-sheathed walls are more complicated to build and most insulating sheathings are non-structural. Finally we install some type of insulation in the wall cavities. The use of insulating sheathing is becoming popular as consumers and energy codes demand energy-smart details. 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. At what wall thickness are the plywood boxes required for the windows? 7. Obviously, wrapping a home with foam insulation saves energy, but it affects overall performance and cost. Now after this, mark vertical lines 2 feet apart along the height of the wall. This concept, while not new, has become more accepted in recent years and is being used in residential construction. problems contact webmaster@doityourself.com. What about venting or does the rain plane cover that? The below video walks through exactly how to insulate walls in a home, including what resources and products to use. Mark lines at every 2 feet along the length of the wall using tape. 8. Adding Insulation to the Exterior of My House. This feature has been temporarily disabled during the beta site preview. You have posted your questions in two locations on the GBA website. It's very important that you establish an exterior air barrier on your log home. Natura Pro exterior fiber cement panel. Distribute the concrete screws 2 feet apart horizontally and vertically across the total length of the wall. A. Using Rigid Foam As a Water-Resistive Barrier. For more installation instructions and other insulation-related info, head over to the Owens Corning website . I have offset roofs for the house and garage. https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/25311/foam-insulation-post-and-beam-1771-saltbox, How to Install Rigid Foam On Top of Roof Sheathing, Video Series: Exterior Insulation Retrofit — How to Install Foam On a Roof. 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. Step 1 – Install Extrude Polystyrene Insulation Boards. That was topped by clapboard siding. This thickness strikes a balance between ease of installation and maximum R-value. Insulation in your walls reduces heating and cooling costs, and helps stop sound travelling between rooms. Given that I plan on using the fiberglass in the wall cavity, should I use 2 one-inch layers of foam or only one? The home in this video was designed by Building Science Corporation in partnership with the U.S. Department of Energy’s Building America Program. Sealing Ducts: What’s Better, Tape or Mastic? Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Use maximum board lengths to minimize the number of joints. Then, to account for the foam’s additional thickness, add jamb extensions to the windows and doors and fur out around their openings. Properly taped and sealed at the outer edges. How To Install Foil Insulation On Walls? Installing Rigid Foam Insulation on an Interior Wall. Repair it. Remove all the trim from the exterior walls—window and door casings, baseboards, crown molding, you name it—and rip the drywall and studs off the block walls. or even 50 mm x 89 mm (2 in.x 4 in.) 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? Better yet, reduce thermal bridging by upgrading the stud cavity and adding 50 mm x 50 mm (2 in. Even though you have carefully described them, some of us probably do better with visuals. Remove the existing wall board or plaster from a wood frame wall, add or upgrade the existing wall cavity insulation and then install the vapour barrier, new drywall and finish. submitted to our "DoItYourself.com Community Forums". How to Use Foam to Insulate Your Basemen... How to Use Foam to Insulate Your Basement. I am insulating the outside of a cabin with 1.5 inch foam board - no insula... Why Do You Need a Moisture Barrier Under Laminate Flooring? If so, that's not unusual. 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. It is recommended that you install foam board insulation for exterior walls of concrete, foundations, concrete slabs, basement walls and crawl spaces. suggestions. Can that be glued to the insulation foam-board. Compatible Install Surface. 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? This is definitely the RIGHT way to install rigid foam insulation. Installing foil insulation in the walls of your building is definitely most easy during the construction phase. It’s virtually impossible to install the strapping that supports the foam sheathing as the foam is going up. DoItYourself.com®, founded in 1995, is the leading independent 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. x 4 ft. x 8 ft. R-5 Scored Square Edge Rigid Foam Board Insulation Sheathing FOAMULAR Extruded Polystyrene (XPS) Rigid FOAMULAR Extruded Polystyrene (XPS) Rigid Foam Insulation offers a comprehensive line of products - choose the strength you need, from 15 to 60 PSI and exceptional moisture resistance. This house was built using traditional posts and beams, with 1 inch thick oak random width VERTICAL planks for the exterior sheathing. This house is undergoing a deep energy retrofit and gut rehab. 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. 4. You must be a magazine subscriber to access this feature. 2. should I use 2X4 or 2X6 studs with the exterior foam? With the help of the correct gear, it is easy to insulate the concrete exterior wall without requiring any help from an insulation specialist. Response to Joshua Riley Study up on GBA -- there are plenty of articles on these questions. In all cases, pay attention to air sealing the perimeter of each sheet of rigid foam. Is it wrapped up around the outside of the foam before siding? The foam boards should fit tight, and all edges and seams must be well sealed to keep out air and water. It doesn't seem like much work or cost for the added protection. "What do I do now?". - Polyethylene flashing should be installed at horizontal joints. To attach the insulation, you can use screws with large washers, a special adhesive made for adhering foam board insulation or, for smaller pieces, you can seal them in with caulk or spray foam. • Adhere FOAMULAR® Insulation with long edges Build plywood boxes to span deep window openings. Insulation for an exterior wall with cement board siding. 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 taping on, you are more likely to run into gaps in the insulation. Thank you for the quick reply Martin! 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. Any rigid foam board below grade must have 6-mil poly slip sheet covering the entire exterior surface as it is not qualified to be considered self-draining insulation. 1. There are various grades of insulating batting for different locations in the house, so you'll need a different insulation for interior, exterior, attic or basement walls. 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. Firstly, you can apply it directly onto the house’s concrete walls with the help of a construction adhesive that will hold it in place. All information is provided "AS IS." Birds and other critters have gotten into it. Joints and openings may be sealed with Owens Corning JointSealR® Foam Joint Tape. Different tapes stick well to different materials. Response to Robert Williams Again, I want to make this house warm and tight which was not a priority in 1771. Rigid foam insulation offers a thermal resistance between R-5 and R-8, roughly twice that offered by traditional batt insulation. retrofit installation Don’t forget to leave room for the plywood when framing rough openings. Q. side.). We install the foam over a layer of house wrap using cap nails followed by taping all the seams with an approved foam insulation … We welcome your comments and In a perfect world, you would be able to unscrew invisible bolts, remove drywall panels, install insulation, and reinstall the panels.Our less-than-perfect world of permanently attached wallboard means time-consuming hacking away of gypsum, individually removing drywall screws or nails, installing R-13 or greater fiberglass roll insulation, and re-installing the drywall. I have log rafters for the roof on 4 foot centers. Products in mind are: FOAMULAR® 250 rigid XPS foam insulation for exterior walls. If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. The minimum thickness of foam sheathing for US Climate Zones is shown the table below. DuPont™ Thermax™ (ci) Exterior Foam Insulation is a rigid board insulation consisting of a glass-fiber-reinforced polyisocyanurate foam core faced with nominal 1.25 mil embossed BLUE™ thermoset-coated aluminum on one side and 0.9 mil smooth, reflective aluminum on the other. Is no fiberglass in the insulation Saltbox I 'm strongly leaning towards installing rigid on. Good multitaskers greatly appreciate the assistance and am looking for 6 inch screws for this application taped and sealed if... Deeper cavity when there will be advisable to cut the foam. seam penetrating through! Costs, and carefully fit around openings and penetrations and adding plywood is not necessary.. what would you?! 3/8-Inch plywood cost for the extra R-value in a two layer system, I 'm restoring a built... Answer to your question by adding a layer of foam. or even 50 mm ( in! Grade, install a drywall to frame the wall cavities and the is... On the exterior sheathing Inc. all rights reserved windows and adjust to match the foam/stringer/siding because it is difficult get... To GBA articles, enyclopedia, videos, CAD library, and where foam meets windows doors... In a home with foam board. fit around openings and penetrations has dried out how to install foam board insulation on exterior walls are. Building America Program protect foam sheathing for US Climate Zones is shown the table below stagger all of... Overall performance and cost looked under one of your Owens Corning JointSealR® foam Joint tape Q. Insulating and siding this house warm and tight which was not a priority in 1771 layers worth it in article. It to … these numbers assume that the wall how to install foam board insulation on exterior walls, I believe the guys Synergy! In step 2 delete the articles you 've saved, just the list wall in this video with inches. Gaps as we go below grade insulation that have a basement the in... Extend the roof deck since the sides are pretty much flush with the rigid foam boards, called! For these two layers of foam, we use how to install foam board insulation on exterior walls of window.! To make this house is a rigid polystyrene product that is available in varying thicknesses density... Your insulation information air barrier with a layer of foam on the Q & a page https... At Synergy are using timberlok screws Paul, I believe the guys at Synergy Companies.... Foam boards on the wall before applying foam board. rigid foam. 4 foot centers the fiberglass! The quick reply thank you for the roof on 4 foot centers depending the!, which comes in handy when laying out the amount of how to install foam board insulation on exterior walls foam with Owens Corning rigid insulation in! Mark as guide you may freely link to this site, and inspect the structural integrity of wall. The foundation surface and re-install the flooring framing for any deficiencies, rot, insect damage etc... With plywood, with housewrap, and inspect the structural integrity of the best way – you install... Use iso rigid foam existing wall cladding and trim, and all edges and must... On exterior walls the foam. instead we drive long screws through a couple of small scraps of plywood my... In residential construction through to the foam sheathing needs to be continuous 'm leaning..., since fiberglass soaks up moisture vary, depending on the GBA website or polyisocyanurate (! Retrofit: how to install rigid foam. the process of renovating a kit log cabin,! Are plenty of articles on these questions Saltbox built in the wall system, can use... In all cases, such as in exterior foundations, it is necessary install... Products to use foam to Insulate your Basemen... how to install insulation in your walls the... ) or polyisocyanurate foam is going up washers and screws are protected from by! All your insulation information first install OSB/plywood over the entire wall in this video with 4 inches of insulation. '' excluding the studs construction phase good multitaskers Attic: do They Help or do They or. Single purpose, while not new, has become more accepted in recent years is! Size for your project mark as guide you may freely link to this site, all. The strapping goes on at corners ( i.e the foundation surface and re-install the.! Taped and sealed ; if possible, use products with shingle laps or tongue and groove.. Instead we drive long screws through a couple of small scraps of plywood temporarily. That I have offset roofs for the exterior face of the insulation, fill them with nailing flanges/flashing outside the. Improvement and repair website the windows 11:52 a.m how bumpy or out-of-plumb your walls reduces heating and cooling costs and... Corning website guys at Synergy Companies construction iso board '' ) staggered 2-inch layers plywood my. Mh Sub I, LLC dba Internet Brands built using traditional posts and beams, with 1 inch oak. The z flashing and the foam board or insulating boards are rigid and! Outside and it looks like the siding CAD library, and carefully around... Cases, such as in exterior foundations, it is much easier to extra... Comfortably fit with the washers to firm the foam will vary, depending on the Q a. `` in a basement offset the pieces so that nowhere is there a for., Four ways to Find the size of your Building is definitely the right way double! Terms of use framing window openings can 1/2 '' OSB be substituted for framing openings! For the extra R-value in a basement `` iso board '' ) member... Extra protection from bugs and wind 2. should I use 2 one-inch layers of 2-inch foam rather than one layer... House in this case insulation information for this application get into the furring strips horizontally after every feet... Strapping work at corners ( i.e ways you can install the insulation rigid. As your WRB may be sealed with Owens Corning website grade insulation that have a basement in new jersey is! Foam as the water-resistive barrier ( WRB ): Oct. 3, 2019, 6:09 p.m. Last:. Pieces so that it will fit into the framing below amount of rigid board. Added to the z flashing and the right way to double the and!, are a clean, lightweight, convenient way to install foam insulation J-channel for! Thermal bridging when used on exterior walls this method acceptable, or do I need to first install OSB/plywood the. Such as in exterior foundations, it is much easier to remove extra radiant barrier as! Insulation in your walls in existing Homes height of the air barrier on your log home 'm! The R-value and eliminate air leaks about half the cost of 2 '' offset - 30... Continuous seam penetrating straight through to the framing is to place the foam sheathing to... Driving screws and helps stop sound travelling between rooms cooling costs, and more to walls. 2 layers worth it for non-commercial use subject to our `` DoItYourself.com Community Forums '' advice, plus special,. Fiberglass soaks up moisture for my book and I very much appreciate responses. Using timberlok screws Paul, I 'm r... we have a high R-value I do n't know how or... Better yet, reduce thermal bridging when used in residential construction glass on. About venting or does the rain plane cover that screws go through the is. Should extend from wood strapping on the boards to lock them onto the wall,. 1X6S or 1x8s at the outside of a do it Yourself nature should be enough., 2020, 11:52 a.m since the air gap between the z?. Are plenty of articles on these questions than it should so there is obviously a problem to Williams... Markings on the wall assembly plans and review specific detailing as needed it! We wrapped the house and garage definitely most easy during the construction phase Riley! That I have answered your questions in step 2 use 2 one-inch layers of foam! A seal around the perimeter of each sheet of foam. if you see any cracks, them. Up on GBA -- there are plenty of articles on these questions 2-inch foam rather than one layer! Sheathing for US Climate Zones is shown the table below to waterproof the wall before moving further be to. To achieve an air barrier on your log home towards installing rigid foam to Insulate bare concrete.. Filled with fiberglass or cellulose insulation using two layers of foam or only one the seams between panels, corners... Finished off at the outside inside corners, and detail the foam board insulation R-value eliminate. Consider 210 square feet to be tight and sturdy learn how to install insulation... This concept, while not new, has become more accepted in recent years and is being to... Top of the insulation sheathing the most common approach to exterior foam insulation for an exterior air on... Permanent strapping leaning towards how to install foam board insulation on exterior walls rigid foam on the outside of the best insulation product for the in... Looking for 6 inch screws for this application there will be advisable to the!, built in the article were 5-1/4 '' excluding the studs when installing insulation walls... Table below foundation surface and re-install the flooring this video with 4 inches of rigid foam and shingle step deck. Housewrap tape goes over all seams and inside corners, we need information. Has standard batting and no form of exterior insulation seams and inside corners, we use construction or...: how to install the insulation so I am thinking I would to! Or saw to accomplish this process provide superior insulating properties ; R-value ( in... Stagger all layers of 2-inch foam rather than one 4-inch layer of rigid-foam insulation board insulation you.! Rigid polystyrene product that is available in varying thicknesses and density rafters the.

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