Vapor retarders keep water out of the siding and down the wall by preventing it from seeping through the components. What you suggest is possible, but it requires meticulous detailing at the complicated seams. Its normally installed after structural sheathing, but may also be installed over existing siding before new siding is put on, or it may be used on its own if the studs have been diagonally braced for stability first. Emily's expertise extends to various siding materials, such as vinyl, fiber cement, wood, and more, as well as the environmental impact and energy efficiency considerations of each choice. I am in the exact same situation as we speak. A. then your siding. First of all, several suppliers, including Maze Nails, makes cap nails up to 6 inches long. OSB costs roughly $6 a sheet of 4 x 8 sheathing. Allan, We recognize that we are a unique climate with unique design details and that our experience does not readily transfer to very many markets, but what I describe seems to be working very well here. Both sides of this argument have merit. Now if you advocated drainage mattes, I might agree. After extensive interviews with building scientists and stucco experts, I concluded that these problems have multiple causes. Because it isnt supposed to be exposed to direct sunlight, typical house wrap should be put and coated in vinyl as quickly as possible. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. My house is down to the OSB right now, and I need to know if I should put the Tyvek up directly onto the OSB or if the Tyvek should be put over the 3/8 foam board directly under the vinyl? Different roofs show different melt patterns. Whether youre building walls on a new home or youre residing an older one, exterior sheathing has an important role to play. Most builders who want exterior foil simply use foil-faced polyisocyanurate. Which one do you thing would look better from both the inside and the outside: 1. Is rigid foam on rim board in basement worth doing if walls aren't insulated? (And by the way, from a journalistic perspective, "Where Does the Housewrap Go?" In most walls, foil in this location would trap moisture that accumulates in the sheathing over the winter, and would prevent the wall from drying to the exterior. Why doesnt SpaceX sell Raptor engines commercially? My research seems to indicate that the foam board product is waterproof. Structural sheathing adds stability and durability to the walls of the home, and in the case of some types of fiberboard, may also add some degree of insulation as well. Foam board is a non structural sheathing designed to help insulate the home and create a tight building envelope. These uses should not be used. Generally yes you would put the house wrap directly over the sheathing, which means under the exterior foam insulation. ", A. The spiral nails are typically 3" , which mean penetration through the 7/16 OSB and occasionally into the 2' O.C. They use a product called Hal-Tex Rainscreen Breatherboard. of sheathing about $1,250 total, with labor costing about $350, and the materials costing around $900. About Stucco: wall applications when it is used as continuous insulation over steel Do you mean under the floors? What are the Different Types of Insulation? | Building Performance It can be installed at a rate of roughly 75sq.ft. I didn't realize Sam, Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Commercial roofers have decades of experience using polyiso, which holds up well on roofs. To install blown-in insulation in existing walls, holes are drilled at the top of each stud space (usually . Is super insulating exterior walls with rigid foam board insulation possible? Also important to remember is that if you are putting a rigid board insulation on the exterior, that as well will have a vapour permeability rating that should be considered. Response to Andy Alden Read our advertiser disclosure for more info. But sure, there's nothing wrong with vapour permeable foam board in so case. Note: Keeping the water out of the house isnt the main concern. What's the thickest layer of foam that can be used with the assembly you describe? Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Non-structural sheathing is designed to work with structural sheathing to help create a tight building envelope that can lower the homes energy costs. Instead of interior polyethylene, use a variable-permeance interior vapor retarder -- something like MemBrain -- if your local inspector will accept that option. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. HomeSealR Foam Joint Tape provides reliable Plaster vs. Drywall: Heres The Difference You Should Consider, 75 Midtown Park E, Mobile, Alabama, 36606, United States. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Like OSB, it can be installed vertically, beginning at the edge of the home or building with the long edge flush to the edge of the studs and the bottom edge reaching to the top of the sill. Are there any major window manufacturers that have such trim extensions as part of their vinyl product line? If you are installing innie windows, your housewrap should go under the foam. On top of the rigid foam panels I will install 14 furring strips using long washer-head screws. It can be used in place of house wrap when installed on the outside of structural sheathing, helping to reduce building costs. It has little to no structural integrity of its own, so it must be combined with other sheathing or bracing. They are kind of expensive but it seems to me that this isnt the place for plastic capped nails or screws. Does it prevent moisture? i have never seen it done the other way, the staples will hold better in the Osb then the foam. I'm not sure it's the best approach. 3. is it possible this could actually be a useful application of foil housewrap products? Allan, construction details. Is Philippians 3:3 evidence for the worship of the Holy Spirit? Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. 2. Thanks for contributing an answer to Home Improvement Stack Exchange! an hour by a skilled contractor, for an installation cost of roughly $490 for 500sq.ft. 3. the sill looks to be in decent shape but it not airtight on the foundation. Weather-resistive barriers are an excellent way to keep water out of the house while also allowing moisture to escape. thats the best way to do it,think of the insulation as a sheathing ''extention'',puts the windows at the right depth and puts the drainage plane where it should be tape all foam joints if you put the wrb on first. I will either tape all of the seams using a quality tape like Dow Weathermate or one of the Venture products. If you want further protection, there's nothing wrong with including a WRB between the foam and the vertical strapping. Vinyl siding will make your house look more refined, but before you can install it, you need to ensure that theres a strong, solid wall behind the exterior cladding. Agreed, except that it might be easier (and cheaper) to tape the foam joints as noted in. The material does not swell, so it can be installed butt-edged across the installation. For years my stucco contractor has talked about using a rich mix in regards to stucco, I found this article interesting. House wrap over insulating foam board or under?? - DIY Home Improvement What Can I Use Instead Of Tyvek House Wrap? But at least it will be done correctly by the time I am done with it. I know you advocate an air space between stucco and foam, but assume there isn't one. ", and the subheads also specifically refer to housewrap rather than WRB's. The tape has a rubber coating on it. The crawl space vapor barrier seam and seal tape is waterproof and very heavy duty. Likewise, if it isnt sealed properly at the edges, it can allow moisture to infiltrate, causing problems for the sheathing behind. Lots of stucco has broken and crumbling, as is some of the rubble. Its a good idea. Because it helps insulate the home, it will also result in lower energy bills over time, which can essentially mean that the material pays for itself. Have you heard any concerns with locating polyiso outboard the WRB or are all the rigid foam products considered identical in this regard? Thanks for the links. Install Electrical Outlets and Switches Safely and Easily with Leviton Decora Edge Devices, A 1950s Bathroom Gets the Ultimate Update, Effortlessly Drill Perfectly Deep Holes with This Simple Tool Hack, How Much Does Gutter Installation Cost? Although I will admit it is a bit idiot proof. So if the plywood/OSB sheathing gets wet, the vapour from the drying process will move through the envelope (tyvek, foam board) to the outside of the building. My plan, which has been evolving, is to remove the 40 year old hardiboard siding which has reached the end of its life here in the high Nevada desert climate and replace it with the following composition in the order shown: [Original] Fiberglass Bats R11 I had a quote to encaps from inside, but after researching I like the idea of exterior insulation. The solution would be to move your wall's WRB to a new location (on the exterior side of the rigid foam). What do you put behind your vinyl siding? We recommend the best products through an independent review process, and advertisers do not influence our picks. Sign up to get our best home improvement guides and resources only shared with email subscribers. It's up to you to decide: what's more important, the air gap or the foam? If you then picture-frame the buck with 3/4" x 4" furring stock (after installing insulation up to the buck) to produce a wide, flat surface for the window flanges to be nailed, the flashing of the window flange cannot be taped to the WRB because the wrap is now hidden by the flanges. If the windows are pushed a bit out to further to the exterior with the flashing directing water to the exterior of the foam, the housewrap goes on the exterior side of the foam. Regarding the statement: "All you have to do is come up with exterior jamb extensions including a sloped secondary sill tucked under the sill that comes with the window to cover the edges of the foam at the window and door openings," If your framing members are 16", 19.2", or 24" OC, that means the 1x2 only attach to sheathing. I'm specifically after details in which mineral fiber is being used, and the wrap is behind the insulation on the sheathing. This is a complicated issue. The wrap can grow brittle over time, increasing the risk of tears and lowering its ability to protect itself. 1. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The complete source for building, designing, and remodeling green homes. As you read GBA articles on topics that interest you, don't forget to check out the links in the "Related Articles" sidebar that appears in most articles. Walls with a continuous layer of exterior insulation will stay dry, but they should be able to dry in at least one direction in case of moisture intrusion from rain. why not use 1/2 instead of the 3/8, I feel that the 3/8 doesnt have that much of an R- value then the 1/2". Continuous rigid insulation is a construction solution that provides a thermally efficient building enclosure. It's certainly possible for the rafters of a roof to be the most insulated part of the roof assembly. Make sure you understand the options open to you to ensure that youre getting the right type of sheathing for every project you undertake. Some of the folks who are closer to the experiment, like Joe Lstiburek, John Straube, or Chris Schumacher, would be able to confirm that. What's the Building Code for Housewrap Installation? Its not possible to cut it with duct tape. This cookie is set by GDPR Cookie Consent plugin. Regular house wrap can't act as a drainage plane if there isn't a gap and a gap negates the foam insulative properties; to my knowledge and is vapor permeable, but even EPS foam in 4" will negate drying to the outside. For more information on radiant barriers, see Radiant Barriers: A Solution in Search of a Problem. Chris, Structural fiberboard is often considered a premium material that offers a small measure of insulating and sound reducing properties to the building exterior, along with structural stability. That doesn't make it right or wrong, but the conventional method of not using an air gap seems to be working. Emily Phillips is a highly skilled writer specializing in a diverse range of home improvement topics, with a particular focus on home siding, building materials, and other essential aspects of residential construction. Exterior sheathing can be loosely grouped into two categories: structural sheathing and non-structural sheathing. Please help! Its main function is to keep water and air from leaking through the vinyl exterior. Is abiogenesis virtually impossible from a probabilistic standpoint without a multiverse? This site is protected by reCAPTCHA and the Google, When the Outlook Is Bleak, Focus on Solutions, To Install Stucco Right, Include an Air Gap, http://www.jameshardie.com/pdf/USTB_Increased-Thermal-Performance-with-James-Hardie-2.pdf, http://www.coastalcontractor.net/article/94.html, http://www.halind.com/assets/pdf/RBP500_Tech_Bltn_2009-04-13.pdf. If the siding is installed correctly, felt paper wont cause a problem because its a weather resistant barrier. A Step-by-Step Guide to the Home Building Process Skip Ahead 1. However, I don't think your worries are justified. Mike, If installing the WRB on top of the foam, do you need to use a selfadhering wrb? If you are installing thick foam on the exterior of your wall, then you've already prevented drying to the exterior -- so the foil layer does no additional harm. Often we install an extra 2x4 "buck" inside a 2x6 rough opening to enhance the recess. For one thing, how do you get around the nailing pattern requirement for lath (6OC). If you want to install "innie" doors and "outie" windows on a foam sheathed wall is it permissible to change the plane of the house wrap as wall features (doors/windows) change? and a material cost of $100 for 500sq.ft., for a total of $590, professionally installed, or $100 for a DIY installation. When structural sheathing is installed, the walls are less likely to twist and bend when other forces are applied, such as wind or house settlement. This is also a fairly expensive material. Note that I did not specify any housewrap as I am proposing to use the polyiso with all of the seams taped and/or glued and all of the edges properly flashed as the WRB. "Won't vapor always drive toward the exterior during a cold dry winter?". The costs of installing gypsum sheathing is around $2 a square foot installed, which makes a 500 sq.ft. Question regarding Housewrap and Foam board insulation - Vinyle siding is definotely not a moisture barrier considering the gaps and ovelaps. Tyvek - House Wrap - Fanfold - XPS Foam Board Insulation - (Best Value) Lets DIY my home 2.26K subscribers Subscribe 25K views 1 year ago Tyvek - House Wrap - Fanfold - XPS Foam Board. So if the housewrap serves a purpose under foam, I will do it on the wall that will be exposed. That should answer many of your questions. You must be a magazine subscriber to access this feature. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Thanks Martin Most good lathers will make an effort to hit the studs and then also fill the field to get the netting to lay flat. Its all about allowing water to run down the siding. Because its also insulating, it can potentially help lower energy bills, and many people use it for exterior sound control to help reduce noise on the interior. Underlayment is used to smooth out the current surface and provide the vinyl with a nice base to attach to. I really think it is an overkill solution that is expensive and adds a design detail that has to be addressed: the added thickness of the furring strips in relation to foundation, windows, and doors. Necessary cookies are absolutely essential for the website to function properly. Improved energy efficiency and reduced air leakage are some of the benefits. It may have weak spots that can cause it to be slightly less structurally sound, with slightly lower shear strength than OSB. Q. Moreover, if the entire wall assembly is warm, what harm is there? 1. Plywood is not as uniform as some other materials. This is typically the case in an uninsulated roof over an unconditioned attic, a garage, or an outbuilding. That is what you need for moisture control in Zone 5. While older fiberboards were cheaper than OSB, todays product is considered a premium sheathing, that costs more than many other materials. Q. The process is similar to condensation, but it's called sorption when it occurs in a porous material like wood, plywood, or OSB. My understanding is that in cold climates (like zone 6 or colder), you want the house to dry outward. Using insulation board on top of OSB and under siding
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