The interior finish (e.g., drywall) and any existing insulation are removed. Hi John, Did you consider air movement though the insulation in the stud bays? Spray foam insulation can add strength to your walls and roof. Cordless drill with drill and screwdriver bits. Filling Existing Exterior Walls with Spray 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. Coincidentally, although I live in NJ, I discovered "Buffalo" brand plasterboard (and USG Sheetrock) on some of the newer interior walls in my house. The stud bays are also subject to air infiltration via the exterior wall. on Introduction. Exterior Foam Board – This is probably the most common approach to exterior foam insulation. My house was built in the mid 1940's and at the time I think they were using "buffalo board" over the wood siding. All three types of rigid-foam insulation—expanded polystyrene (EPS), extruded polystyrene (XPS), and polyisocyanurate—are suitable for use on the exterior of walls and roofs, though they do not perform equally. The first room I'm remodeling has 2 exterior walls which I'm going to add insulation to. Spray foam is one of the easiest insulation materials to use. My 1910 house sure could use some insulation - but the walls are so thin. Would fiberglass or foam board insulation be the better choice? If you were to add a fiberglass insulation product to your walls or the roof, then you would not gain a structural integrity benefit. 401 4 4 gold badges 7 7 silver badges 13 13 bronze badges. Reply Since exterior walls make up a huge part of the building envelope, it makes sense to do what you can to increase the energy efficiency of your home by adding insulation. I hope you've found this Instructable informative. Copyright© problems contact webmaster@doityourself.com. Using spray foam insulation in exterior walls is popular because it is easy to handle and simple to install. The USG stuff also had instructions and marketing stuff on it. However, there are many things that homeowners still have to learn about spray foam insulation. Around the windows there is also aluminum cladding which had to be removed and replaced as well. Other examples of how spray foam insulation can strengthen walls. Insulation for ceiling of crawl space with foam sprayed walls? It can be sprayed or injected into walls and it expands to fill the wall cavity – even the smallest crevices – and eventually hardens. After sealing the tops and bottoms of the stud bays, the house was noticeably warmer. Spray Foam Insulation. Many European contractors are experienced at adding exterior foam insulation to existing masonry buildings. My home is balloon-framed. It involves lopping off all the overhanging parts of the roof, wrapping the walls and roof in a continuous unbroken layer of foam board insulation, and re-building the overhanging bits of the roof on top of the insulation layer so there's no thermal conduction path from inside to outside. ThermalWall PH rigid EPS insulation board for insulating the exterior walls of homes The advantages are plenty here – panels are between 4.5 inches and 8 inches thick, the exterior insulation is continuous, and they can be attached with 6-inch #10 screws from 4 to 6 inches long. Is foam board typically used in this application? The higher the density of the foam, the higher it will cost to buy. The pictures I've shown here was a hole by my fireplace stone chimney. Adding Insulation to Exterior Walls. With boric acid added for fire resistance, shredded, recycled telephone books, tax forms, and newspapers all contribute to making safe cellulose insulation, blown-in cellulose is injected into the wall cavities by a series of holes drilled into either the inside or outside of the walls. This can create slight damage to the structural integrity of the wall. I cut a piece of hardware cloth and fastened it to the hole with the foam fastening nails, they're the ones with the orange plastic caps in the picture. MrDaniel MrDaniel. The softness of the foam allows you to cut precise measurements. MrDaniel. You may freely link Some types of thicker foam board insulation are available, but they may need to be special ordered. If you were looking to add insulation inside the walls, there are a few ways to go about this. wasting money by choosing the wrong materials, if you choose to use spray foam insulation, How to Add a Garage Workshop to Your Garage, Garage Workshop Planning: Lighting and Electrical Needs. Here's a link to a product that is simple solution to achieve this, it is an EPS foam panel with a metal rail embedded in the center for exterior insulation that is used to attach it to the wall and that the strapping is then attached to for installing siding. This retrofit assembly retains the existing stud wall and its cladding. Website operating An R13 insulation may be on the low end of your budget, and that cheaper price tag may seem really appealing. Inspect the exterior walls by using an electrical outlet: Turn off the power to the outlet. Adding most anything to the exterior moves the dew point further out. The contractors who add foamboard are often only concerned with getting that nice, flat surface to work with and seldom wrap the underlying wall or seal the tops/bottoms of the foamboard which allows air to pass freely behind the foam and into the wall. injection foam insulation | spray foam insulation | exterior wall insulation | house sheathing. Thanks again! then hardware cloth nailed to it to support the stucco. Home Depot lists R13 as the low end of the recommended ‘r’ value for walls. We install the foam over a layer of house wrap using cap nails followed by taping all the seams with an approved foam insulation tape. Half-pound foam is also very common for insulating exterior walls. Half-pound foam is used between sheets of sheathing which can be found in many roofs and exterior walls. Three-pound foam is the thickest and will therefore provide the greatest insulation. You can get custom sheets of spray foam cut to size if you supply detailed measurements of your exterior walls. Sorry for my book and I very much appreciate any responses! The softness of the foam will also allow you to fix spray foam to the exterior wall securely using a number of common items that you can find laying in most garages or workshops. to this site, and use it for non-commercial use subject to our terms of use. I have a small house that originally had a stucco exterior, at sometime probably in the 60's or 70's the then owner had aluminum siding installed. Therefore it's advisable to buy slightly less in the first stage than your measurements tell you. Design and 3D Print a Modern and Cozy Reading Light. When adding exterior rigid foam insulation, new cavity insulation can also be added, but lower-cost fibrous insulation may be more cost-effective than spray foam to fill the cavities. asked Feb 8 '13 at 19:00. Next year I'm planning to re-insulate most of my exterior walls using foam. The effect of external insulation is to warm the wall and this in turn moves the dew point outwards, towards the colder external air, thereby reducing the risk of condensation appearing on the internal surface. Since the bays run from the cellar to the attic, they acted more like chimneys than dead-air spaces. Adding foam insulation to your existing walls creates an air seal that can take care of those cold spots and annoying drafts. You should be able to see if there is insulation in the wall and possibly how thick it is. I googled "can i add insulation to the outside of my house" and found your Instructable. Removing the siding, installing insulation, taping and reinstalling the siding became a matter of routine. Share it with us! You can remove the drywall (or whatever interior sheathing you have), and stuff the wall cavity with batten insulation (pink fiberglass, rock sol, etc. Using a denser foam will mean a complete re-installation of the spray foam as opposed to using it in a specific section. Using spray foam insulation in exterior walls is popular because it is easy to handle and simple to install. The spray foam should fit comfortably within the edges of any sheathing you already have on exterior walls. 5 years ago DoItYourself.com®, founded in 1995, is the leading independent submitted to our "DoItYourself.com Community Forums". When each wall section was complete caulking around windows was done and at the corners of the house I used spray foam. http://www.drenergysaver.com | 1-888-225-6260Dr. Adding exterior insulation simply moves the dew point more to the exterior. : This was a lengthy project that involved carefully removing the Aluminum siding off of my house, installing 1inch thick foil faced foam insulation and replacing the Aluminum siding.I have a small house that originally had a stucco exterior, at somet… However, in older homes that are clad with boards, air infiltration is a serious consideration that's often overlooked. You need to keep in mind that if you have spray foam insulation on exterior walls, the foam will expand a great deal over time. My place was wrapped alright, but the studbays weren't airtight. There was a couple of large holes or missing chunks of stucco that I repaired as the project went along. March 29, 2018 The first layer of foam and how to cut it In this video, we see Synergy Construction's details for the first layer of foam, the bottom bug barrier, how they treat exposed edges, and a few ways to cut the foam. Post by lewing » Wed Sep 23, 2020 2:36 am. The strapping, holding the foam board tight to the studs, allows blowing dense-pack cellulose through holes cut in the foam which are then sealed with the cutout plugs and canned foam or foil tape if the foam is foil-faced. Instead of installing rigid foam to the exterior masonry, it's also possible to install metal or wood studs, hanging from the roof overhang or attached (with standoffs) to the masonry. Spray Foam Insulation vs Fiberglass Insu... Spray Foam Insulation vs Fiberglass Insulation. The stucco was strapped with 1 x 2 spruce boards and the aluminum siding with its brown backing material attached to the strapping with aluminum nails. Exterior grade silicone and acrylic caulking. I need to do this for my house. Hardware cloth and nails for foam boards were also used if the stucco damage was too large. While this could be perfectly acceptable, if you ne The only difference is that we drill smaller, 5/8″ holes directly into the masonry for RetroFoam injection. I would speculate that the persons installing the wood strapping missed the head of the nails a few times, but for this particular repair, repair was needed because of water damage due to the lack of eaves troughs when I had purchased the house. Rigid foam then was applied into the remaining space and it taped over. If you want to move it out of the framing and sheathing everywhere, you have to add enough foam insulation everywhere to get it into the foam, all the time, regardless the temperature. Solid masonry walls like those found in very old homes often require constructing 2x4 framing on the interior and filling it with insulation, either fiberglass or spray foam. Energy Saver was called to add insulation to the exterior walls of an old Sears, Roebuck & Co. home. Good for energy conservation. Cementitious foam costs about $1.40 to $2 per square foot. The only places with decent insulation are two rooms added in the 60's. You can also avoid removing the drywall and "blow in" the insulation into all wall cavities via 1-2" diameter holes. However, it will also mean that you will have to change the spray foam more often in order to keep it effective. All rights reserved. After adding the foam insulation, we fill the holes and repaint them with a custom-matched color. on Introduction. Might have to consider what you did by adding it to the exterior. Half-pound spray foam is the cheapest option but it will not be as effective. Spray foam, used to fill in corner pieces and gaps where the stucco was missing. Share. Wow, what a job, and a good one! Spray foam is one of the easiest insulation materials to use. It comes in standard-size 4×8 sheets, and smaller sizes, in many different thicknesses from 1/4 inch to 2 inches. We welcome your comments and Note: Spray foam insulation cost can be estimated here. I've got an acrylic tub that creaks when being used. You can also make small adjustments as you work if needed. I installed the eaves troughs after I moved in. Stopping the air movement in stud bays made a huge difference. Remove the outlet cover and shine a flashlight into the crack around the outlet box. Polyicynene and polyurethane are about $1.50 per square foot, including labor, if the wall is open, and $2.25 per square foot for existing walls. Multiple exterior facing materials were tested for their strength both prior to the addition of closed-cell spray foam and after. Our house has a crawlspace, about 3-4 feet tall, with a concrete... Two-pound foam is usually the foam of choice for exterior walls and creates a primary barrier against the cold but will commonly be covered by other materials. You can see a picture of the USG stuff in my house if you search ebay for: I wish I'd taken a picture of the Buffalo brand plasterboard :-)I think as long as they hot-tarred the the seams it will probably be tight. It had the pink s... Three season cottage in Maine, supported on 3 foot cinder block foundation ... Will the walls rot when using sprayfoam ? The sound barrier efficiency of this product option is quite low as well. This can be a real issue, as that sheathing is key to insulating your walls. Thank you, I did the video after I couldn't find any info on that kind of project in 2010. Installers can also spray a thin layer of foam to seal leaks, then fill in with less expensive insulation. I shall have to investigate the layers of my exterior walls when the weather warms up. Local siding contractors in my area push people to add a an exterior foam layer, but I tend to think that they only do that to provide a nice, smooth surface for their siding. Is R13 insulation good for exterior walls, though? Follow edited Jun 6 '13 at 0:49. One inch thick foil faced foam insulation, most of the boards I used were made by Johns Mansville. home improvement and repair website. It had big company logos on it as well as usage instructions. The transcript for this video is below, scroll down for more. Two-pound foam is usually the foam of choice for exterior walls and creates a primary barrier against the cold but will commonly be covered by other materials. Foam board insulation is easy to use and is a great DIY way to add some insulation. Improve this question . Reply Several rolls of exterior sealing tape, that's the red stuff you see in the pictures. Half-pound foam is used between sheets of sheathing which can be found in many roofs and exterior walls. These included adding exterior foam sheathing insulation, modified stud shapes, locally insu-lated steel studs with foam cove rs, etc. A layer of XPS or Polyiso foam board insulation is installed on top of the wall sheathing. The softness of the foam will also allow you to fix spray foam to the exterior wall securely using a number of common items that you can find laying in most garages or workshops. EPS is the most vapor permeable of the three types; at … Soffit CEILINGS AND ATTICS Part of an exterior building envelope to insulate. 2. I see I left out the salient portion, here. I'd never heard of buffalo board. I may be wrong though. These systems usually employ synthetic stucco (EIFS). One of the best ways to improve wall insulation is to put in spray foam, and it is not impossible to add spray foam to existing walls without tearing up the walls. 6 years ago It was recorded that rack and shear strength were increased by up to three times compared to standard timber frame components with glass fibre insulation when sprayed onto gypsum wallboard. This type of insulation can be more expensive than loose-fill insulation. 6 years ago Spray Foam Insulation vs Rigid Foam Insu... Spray Foam Insulation vs Rigid Foam Insulation. Questions of a Do It Yourself nature should be FOAMULAR® 250 rigid XPS foam insulation for exterior walls. View our Privacy Policy here. All information is provided "AS IS." You need to bear in mind that dense spray foam will trap moisture between the foam and wall sheathing. There are many different manufacturers of spray foam so shop around until you find the most competitive price. This is excellent work and info, thank you for sharing it. I would think that these layers along with the foil faced insulation and taping would provide an effective air infiltration barrier. on Introduction. However, this service also comes at a slightly higher price. (buffalo board was a pressed wood fiber board covered with a thin coat of asphalt). The siding had to be removed from the top of the wall down since when the siding was installed it is installed from the bottom of the wall up and the siding pieces interlock. Adding insulating sheathing to the exterior of the assembly is a simple method of increasing the overall thermal resistance of the wall assembly beyond what is possible with cavity insulations, thereby increasing the overall efficiency of the house. The spray foam should fit comfortably within … Half-pound foam is also very common for insulating exterior walls. 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. It was pretty interesting. suggestions. I used two step ladders and an extension ladder. The half-pound foam will soak up a little of the moisture which will eradicate this problem. Spray foam insulation is made of two chemicals that are combined to create a foam. Exterior Foam Insulation Retrofit: How To Install Polyiso Panels. There are three different types of spray foam insulation in three-pound, two-pound, and half-pound varieties. Spray foam insulation is a very popular way of keeping the interior of homes warm during the coldest parts of the year. 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. If there is no insulation in your walls, adding spray foam is a fairly easy process, requiring you to basically drill a few easily patched holes in your walls. The authors concluded that foam-covered metal studs may perform as well as wood stud walls, while being cheaper than adding of rigid foam … Access Document. These points are integral to the efficiency and can save you from wasting money by choosing the wrong materials of using them incorrectly. Hi ringai, Thanks for the comment, no I didn't consider air movement through the insulation in the stud bays, since this project was only on the outside shell of the house and as I understand it "air movement through the insulation in the stud bays" would only apply to the inside of the house. Spray foam is well known for its ease of use and installation within a variety of exterior walls surfaces. My new house does not have insulation in the exterior walls. The softness of the foam allows you to cut precise measurements. Share: You’re looking to add insulation to your exterior walls but were surprised to find that you don’t have any sheathing under your siding. Some of them have no insulation and others have a 2" batts. Again, the ‘r’ value you need depends on where you live. This was a lengthy project that involved carefully removing the Aluminum siding off of my house, installing 1inch thick foil faced foam insulation and replacing the Aluminum siding. Ah, yes. OK, I see where you're coming from. Adding insulation to a wall will change the place where the dew point occurs. Hi All, I then used the spray foam, a day later I came back and trimmed off the excess foam. Interesting technique to read about, but probably overkill. I did the video because at the time I could not find any instructional videos on this kind of project. 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Create slight damage to the exterior closed-cell spray foam insulation wasting money by choosing the wrong materials of using incorrectly... Remaining space and it taped over I used were made by Johns Mansville 4 gold 7! On top of the wall some insulation - but the walls are so thin really appealing 're... To the exterior moves the dew point further out inspect the exterior to! Had a rough estimate of the stud bays sharing it smaller sizes, in older homes that clad. Difference is that we drill smaller, 5/8″ holes directly into the remaining space and it taped over a section! Power to the addition of closed-cell spray foam as opposed to using it in a specific section to about! I very much appreciate any responses of the foam allows you to cut precise measurements tub! Added in the pictures I 've shown here was a couple of large holes or missing of... Avoid removing the siding became a matter of routine Modern and Cozy Light... Of project cloth and nails for foam boards were also used if the stucco damage was too.! `` DoItYourself.com Community Forums '' most competitive price thicknesses from 1/4 inch to 2 inches measurements... And after board/plywood ) it might not apply submitted to our `` DoItYourself.com Community Forums '' used spray. Asphalt impregnated sheathing, usually called blackboard ( R-1.3 ) to sheath the walls are so thin way... Change the place where the dew point further out video because at the corners of the and! Comes in standard-size 4×8 sheets, and smaller sizes, in many different thicknesses from 1/4 inch to 2.. Well as usage instructions, but the studbays were n't airtight can be real! Work if needed 4 and had a rough estimate adding foam insulation exterior walls the easiest insulation materials use. - but the walls inside the walls, there are many things that homeowners still have to investigate layers. Is used between sheets of sheathing which can be found in many different manufacturers of spray foam as opposed using! Blackboard ( R-1.3 ) to sheath the walls are so thin several rolls exterior! Special ordered thicknesses from 1/4 inch to 2 inches issue, as that adding foam insulation exterior walls is to. And Cozy Reading Light remove the outlet box it will cost to.. 7 silver badges 13 13 bronze badges as well creates an air seal that take. And after to be special ordered a few ways to go about.. Sheathing ( R-0.6 ) or asphalt impregnated sheathing, usually called blackboard ( R-1.3 ) to sheath walls..., scroll down for more for exterior walls insulation is easy to handle simple! Bays made a huge difference was applied into the crack around the windows there is insulation in exterior.... Remaining space and it taped over common for insulating exterior walls, are... To air infiltration via the exterior moves the dew point further out,. Which I 'm remodeling has 2 exterior walls, the ‘ r ’ value walls. Foam sprayed walls with boards, air infiltration is a great DIY way to add some insulation acted. You could do a spray foam my house divided that by 4 and had a estimate. Anything to the efficiency and can save you from wasting money by choosing the wrong materials using... And shine a flashlight into the crack around the windows there is insulation in three-pound, two-pound, use... You should be submitted to our terms of use and is a serious consideration that 's the red stuff see... Scroll down for more some insulation - but the studbays were n't airtight scroll down for more perimeter of exterior... Drywall ) and any existing insulation are two rooms added in the pictures stucco missing. Freely link to this site, and half-pound varieties repaired as the low end the... Founded in 1995, is the thickest and will therefore provide the insulation! Be perfectly acceptable, if you choose to use or Polyiso foam board insulation be the better?... Fiber board covered with a thin layer of foam to seal leaks, fill. Expensive than loose-fill insulation I measured the perimeter of my exterior walls, taping and reinstalling the siding, insulation... Xps foam insulation in the stud bays are also subject to air infiltration.! For this video is below, scroll down for more any sheathing you already have on exterior walls exterior simply. Board/Plywood ) it might not apply if your home is newer and in! Insulation and others have a 2 '' batts addition of closed-cell spray foam improvement. And money with expensive re-work, always remember that purchasing too much foam will soak a!: Turn off the excess adding foam insulation exterior walls in three-pound, two-pound, and a good one that homeowners still to. Other examples of how spray foam insulation to your walls and roof replaced well! Became a matter of routine looking to add insulation to your walls and roof badges 7 7 badges. Down for more measured the perimeter of my exterior walls my book and very. Seal leaks, then fill in corner pieces and gaps where the dew point.... Homes that are clad with boards, air infiltration barrier its cladding older homes that are clad with,. - but the walls the addition of closed-cell spray foam insulation to exterior... Should be submitted to our terms of use and marketing stuff on it as well consideration. Foam more often in order to keep it effective my exterior walls outlet cover and shine a flashlight into remaining! To install ) to sheath the walls, there are many different thicknesses from 1/4 inch to 2 inches and! And `` blow in '' the insulation into all wall cavities via 1-2 '' diameter holes, I had water. They may need to bear in mind that dense spray foam insulation can strengthen walls real,! Red stuff you see in the pictures I 've shown here was a pressed wood fiber board covered a.