Thanks in advance for your advice. Todd, would you recommend using 2″ rigid foam? February 13, 2013 Exteriors, Insulation & Air Sealing, Siding I’ve become a big fan of utilizing Outsulation on all my houses over the last 2-3 years. Could I create a new problem in the process? Would like to have house sheathed –but the cost of doing it is too much too afford (house is 24 squares). we are replacing the roof first and adding overhangs and removing the patio covers. The original sheathing is fire proof exterior gypsum board. Is that insulation ok? Q. I don’t think builders should install wood siding directly over plastic foam insulation. This helps move the dew point out of the wall assembly to prevent moisture problems. Dupont says you can install it either way, however we typically install the foam over the house wrap. This is my first time replacing siding. Installing Foam Board Insulation Under Vinyl Siding Today more than ever before homes are being built with foam board insulation installed on the outside of the sheathing and under the siding. Today more than ever before homes are being built with foam board insulation installed on the outside of the sheathing and under the siding. Use a utility knife to trim around exterior faucets, electrical boxes or similar protrusions as you are covering the walls. A.Corresponding editor Paul Fisette responds: Some vinyl siding manufacturers void their warranty for heat distortion when their siding is installed over foil-faced foam. A 1 1/2-inch thick sheet of rigid foam insulation has a R-value of 7.5. We just purchased a Mobil home that has water damage. John – The best approach these days is having a continuous layer (usually about 2″) of foam on the exterior of the home. Thought about getting spray foam in that. Tyvek recommends putting the HomeWrap over the foam board. Dennis – with 1/4″ foam it doesn’t matter at all. Use extruded polystyrene or XPS in most cases, usually 3/4- to 1-inch thick, but check local area building agencies for specific recommendations on thickness. Set panels on the wall, starting at one end of the house, align the edges with the corner and bottom of the wall and nail them to studs with 3/8-inch head galvanized nails. Some people use roofing nails, but if a strong gust of wind gets under the siding it may not hold. Rigid foam insulation offers a thermal resistance between R-5 and R-8, roughly twice that offered by traditional batt insulation. Thank you, Scott. Why insulation under the siding is important. Home is in New England. I will be building in central Illinois. If it were my home, I’d save some extra money and do the sheathing. Bob Haring has been a news writer and editor for more than 50 years, mostly with the Associated Press and then as executive editor of the Tulsa, Okla. Step 6 - Use Furring. The method works for both new construction and remodeling and doesn’t affect siding and trim details very much. If I go with the exterior foam board, I am concerned about hanging heavy hardie board siding 2-4 inches away from the studs. I was thinking to apply housewrap (there currently is none), then 1/4 fan-fold insulation and non-insulated vinyl siding, or the housewrap then insulated vinyl siding. All Rights Reserved. I thought I should show why continuous foam under the exterior siding is so important. © Copyright 2020 Hearst Communications, Inc. XPS is the most common type of exterior foam board but there are other types. In the end, the decision to install house wrap under your siding is a personal one that you should make after discussing it with your contractor. If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. Paul – I would likely install the building wrap over the old sheathing, then the foam, then firing strips, then siding as you outlined. The home has a product that looks similar to siding but it’s sheeted. This detail is used with both new construction and also with renovation work. Which choice would be best for noise? Place panels tightly together; some styles have tongue and groove edges, so one panel slips into the next. This type of insulation may change and flatten the contour of the panel, causing the siding … First of all it adds to the overall R value, which can be quite significant depending on the thickness and type of insulation used. There are people out there using 2″ but you’ve got two issues to deal with. FANFOLD foam residing board is a thin perforated, extruded polystyrene foam board faced on one side with a plastic film facer and combines proven XPS foam technology with a unique design to enhance the application of new or replacement siding. House wrap or foam board insulation helps insulate and level out the exterior of a house. You’ll also need to pay attention to window and door extension jamb depths as they will increase if the window is mounted flush with the foam board. An architect in the Rocky Mountain west puzzles over details on a house that is to have an exterior layer of rigid foam insulation and board-and-batten siding. Exterior insulation is a foam-like layer that is applied under the new siding. Check the wall framing for any deficiencies, rot, insect damage, etc. What are your thoughts?! Rigid foam insulation tends to have a low to moderate R-value per dollar, compared to fiberglass. I was thinking of installing 3/4″ rigid insulation on the exterior of a stucco house. It’s a great detail, but there’s lots of confusion around the industry on the topic. Hi Todd, I’m insulating a 700 square foot cabin with a walkout lower level with a concrete block Foundation. Using exterior rigid foam board insulation is a great way to make a building more energy efficient, quieter and more likely to prevent moisture infiltration problems. It comes in standard-size 4×8 sheets, and smaller sizes, in many different thicknesses from 1/4 inch to 2 inches. Thicker foam requires different details that make it tough to do after the fact. 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. If I were to install Tyvec, would it go on top of the OSB and under the insulation board? I’m trying to do my homework before I start. 2×4 construction with board sheathing and a black paper then the wood siding. Below are some of the design details along with the benefits… I know you mentioned that house wrap under the foam is the recommended order of operation but based on what I have found, it sounds redundant. Enough for? This detail is used with both new construction and also with renovation work. Wood siding applied directly to foam has a history of failures. The next step is to cut the foam board insulation so that it will fit into the furring strips. To handle the foam with a mini-mum of thermal bridging, tack it in place with foam-board adhesive or hold it up while installing furring to hold it in place. What do you think about the Henry Blue skin over plank siding on a 1960 ranch with 1/2 inch foam board over top? Foam plus wood siding is one thing (the wood has some strength, especially for impact loads), but foam and vinyl does give me some heart burn. Please take some more time to explain the BIB system. This is especially true if the wall is filled with fiberglass batt insulation. Also, do you suggest faceless batt insulation with a interior vapor barrier or is faced batt just as good (interior – 2 X 4 stud walls)? Nailing wood siding directly to foam doesn’t work because nails have to be extra long to reach through the siding and foam to a solid nail base. But, I learned better through internet. Seal the seams between panels, wall corners and door and window openings once the entire house is covered with foam board. Some people prefer using it in their metal frame building because it doesn’t capture moisture like fiberglass insulation does. We live in PA when the temperature can get pretty cold in the winter at times. Anyone have some help and possible suggestions? Thank you for your answer in advance, your post are wonderful, thank you very much. My research tells me that it is structural but it is not intended as a nailing base. Any opinion about putting Tyvek over or under the foam insulation. Remove the existing wall cladding and trim, and inspect the structural integrity of the wall. Use nails long enough to penetrate the siding and foam board into the framing. Putting an insulation layer could help you to stay away from this issue.

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