I also agree that you need to start out straight. If the gaps are filled, whether with sawdust, other debris, or an intentional sealant, then their ability to absorb expansion will be compromised. plants capacity. Copyright 2000-2023 M2N Limited E. & O.E. Some OSB manufacturers won't warrentee their product used as roof sheathing on an unvented roof, because while OSB is slower to absorb moisture than Framing crews like to install 9 long panels in the vertical orientation for 9 walls because the installation goes much faster. Figure 3 shows siding and I-joist Gaps between the sheets are specified by the manufacturer because the gap allows for a bit of movement - expansion, in particular - to be absorbed without causing Forest products companies are utilizing raw materials more efficiently with better Put up new Hardie and shim the #### out of it and now it looks half way decent. @crip659 I think I figured out why. This can transfer to a visible bump in the roofing. This may not seem like very much of a difference, but its four times thicker. The best answers are voted up and rise to the top, Not the answer you're looking for? Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. In conclusion, OSB comes in many different sizes and can be used for several applications due to its strength and durability. The last nail to the edge should be no closer than 6", to allow the tongue to ease up the groove if need be. While specs for different manufacturers will vary, in general, OSB will expand and contract 4x as much on the 4 width of a 4x8 sheet than it does on the longer 8 length. You need to have a blower door test and thermal infrared camera inspection to determine specifics. solid status in the market until the mid-1980s. j. Owners of livestock and poultry in Oklahoma may have interest in marketing their animals, a portion of their animals or the meat/poultry from those animals directly to consumers. New blog post from our CEO Prashanth: Community is the future of AI, Improving the copy in the close modal and post notices - 2023 edition. If there was no foam on the exterior, it may be able to adequately dry to the outside without too much trouble, but the fan fold is acting as a vapor barrier, keeping the moisture in the OSB. While most of these sources seem unavoidable, they are at least manageable with good site management and timing. For example, if you are building a shed then the most common size would be to have it cut down into four-foot by six feet panels. If you are looking for a material that can withstand complete exposure to water, then you will need to use something else such as plywood. What are the different grades of the OSB Board? In the end I decided it didn't matter too much (it's a workshop and day to day no one will see the roof). Roofer insists warm-deck roof needs an air-gap is he right, does it matter? You've got that right!! These spacing recommendations may not be adequate for buildings over 80' in length or width. to OSB, which are almost comparable to plywood. It was a windy day when I glued the EDPM down, and this caused the membrane to be slightly lifted rather than depressed over the gaps. Any standard timber joints can be used for. I dont have any literature, but these are some of the reasons to gap. Zinc borate and oxine copper are sprayed Figure 2. "A lot of the reported cases of swelling and failure are on garages where the moisture gets to it from the underside. That's not a gap--it's a nearly complete lack of engagement. dry storage pallets and industrial tabletops. on environment as compared to plywood. Waferboard. OSB is not used for applications where there is direct contact with a moisture source, Long story short, ALWAYS gap your OSB. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The butt joints are really obivious on early morning frosts in my area of centeral Illinois, I've never had a problem not spacing the fir sheathing on a roof in 25 years. Wall sheathing should usually be at least 7/16-inch thick, but in some cases, 1/4-inch may be enough. Learn about the challenges of meeting Oklahoma's farmers' market regulations and various requirements such as fees, permits and certifications. OSB board comes in thicknesses of inch up to inches thick. Thanks for bringing this info back; if you think it's the best answer you can mark it as "accepted" by clicking the checkmark. Applications of OSB as siding and I-joist. I've never personally had a problem with OSB. WebAPA extreme linear expansion values, for an eighty foot long roof, assuming a 3-inch linear expansion per eight foot panel length, an average 1/8-inch gap between sheets and an average 1/8-inch fastener/ end crushing per panel, would result in a net linear lengthening of the roof of zero. It happens to get cold enough to condense inside the OSB which causes it to swell. Which one to choose? But not until many years? However, if you are roofing a shed, the most common size would be to cut it down into four-foot by eight-foot panels. WebTo get a stiff floor, this is my recommendations: joist spacing should not exceed 16"o.c. There was an article a few issues back in JLC showing framing mistakes One of the probs was some OSB on a wall that had been installed tight then buckled. Copyright 1998-2023 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. When the tongue does not want to align with the groove readily, I screw down a block onto the piece that is already down where the next piece has lifted up, this will draw it down to line it all up. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. of its dimensional stability. You must be kidding!!! Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Powered by Xenforo, Hosted by Nimbus Hosting, Original design Critical Media Ltd. It is usually used when building something that wont be exposed to too much wear and tear outside. Educating homeowners on the importance of monitoring humidity and using ventilation systems will also pay dividends beyond the durability of OSB. https://files.engineering.com/getfile.aspx?folder=2d6fd1f1-010c-4b08-9e2a-f, Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. Home > Most stores cut down their boards to meet standard sizes before drying them fully so they are not too big or small when finished. That said, we always used BIG hammers--six pound sledges--along with a "beater block" consisting of a 3-5' 2x4. Europe's busiest forums, with independent news and expert reviews, for TVs, Home Cinema, Hi-Fi, Movies, Gaming, Tech and more. Check to make sure that the OSB is in stock because each stores supply will vary between them. Can the game be left in an invalid state if all state-based actions are replaced? We have received your request and will respond promptly. Some just use the blade on their combo square, others have something made up. Figures 1 and 2 illustrate strand orientation of typical OSB and a general manufacturing Want to know where thehabit of doing 16" oncenter layout came from? The dimensions of OSB vary depending on the project you are working on. Do any of you do this for sub roofing. I'll admit to not doing that all the time although I do space them the long way. If you are building an outdoor deck with this thickness, then the most common size to use would be to cut it down into four-foot by six feet panels. Today, Thickness: The thickness of the OSB board will determine how strong it is. So the contraction of the joist brings the OSB onto a collision course? Not for me. WebThe gap should be 1/8" between ends. > We know from experience that 3/8 of an inch is a pretty safe dimension 4 with stucco, manufactured stone veneers, wood claddings or other claddings like fiber-cement that lie flat against the housewrap and OSB ( Photograph 3 and Photograph 4 ). If you want to educate them we all know that building materials expand and shrink to different degrees simply from heat and cold. A combination of pressure and temperature is applied to cure the resin and give stiffness A helpful guide that clarifies food business categories with their corresponding definitions and license fees. OSB3 is not waterproof; the term moisture resistant applies to the adhesive binder which will not break down in the presence of moisture (within BS EN 300 limits). panel and its density. I would guess not .but would like to know the practice. Check for any damages before tting. Been reading that a 3mm expansion gap should be kept between the boards. This site can be cut down into smaller sizes for your project needs depending on how much room you have and what its going into. Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so its critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. While T&G OSB will not go completely tight on the surface (that's how it's designed), you need it mostly tight. The thickness of an OSB board is usually between 0.35 and 0.55 inches, depending on the manufacturer and/or style you are looking for. 28 Apr 2023 11:01:29 @r13 no I am adding a master suite to our attic. For my walls, I am using a layer of OSB with plasterboard on top, but have seen mixed advice on how much gap should be left, namely above and below (i.e at floor level and around the ceiling) when putting boards up. OSB boards come in a variety of sizes, thicknesses, and grades to choose from. OSB is also commonly used when building walls, either inside or outside. This particular size is also easy to find because its a standard size that lumberyards and home improvement stores typically carry. Walls usually aren't subject to much weather. Get home building tips, offers, and expert advice in your inbox. in both commercial and residential building. Should these be filled with anything prior to covering? Besides inspecting each tongue and groove before setting the subfloor in place to be driven in, have a real heavy hammer, something like a 5 lb sledgehammer works well for this. It takes a lot of force to overcome the friction of that rough wood when inserting tongue into groove. to 5 to 10 percent moisture in large, rotating single-pass or triple-pass dryers with Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Builder's Business, Diagnosing Problems, New Home Build, Performance Professionals, Recommended | 9 comments. Sources of moisture range from rain and snow to the fumes of construction heaters. Always used sheets "sized for spacing". Most sheets are clearly stamped, "sized for spacing". Ive done a lot of pole barns and this is the first time Ive had this problem. However, if you need a thicker sheet, such as one that is three-quarters of an inch thick, the cost will be around $30. I've used it literally hot of the press and it measures the same. Dried strands are classified into two sections using various sizes of screen. I had built a roof over our front porch using OSB and did not leave an expansion gapwhat a mistake! WebFrom an unventilated cold roof with traditional GRP delaminating from a plywood deck with no expansion gaps to a cold roof with ventilation, using #Flexitec2020 on an OSB tongue and groove deck with expansion gaps to the wall abutment. Let me guess, you're from the Carolinas, right? 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. Click Here to join Eng-Tips and talk with other members! As the humidity moves through an insulated wall assembly, the temperature drops (during heating season) as it approaches the exterior sheathing. When selecting an OSB board for your project, it is important to consider the following key features: The size you have will determine which type of use is best for it; The OSB wood can be used in a variety of applications and uses. The most common types of projects are residential and commercial, but there are also other types such as agricultural or industrial. Here are some examples: This is the most common use of OSB; this includes everything from small garden sheds to larger utility ones. http://www.homeinnovation.com/~/media/Files/Reports/Construction-Guide-to-Next-Generation-High-Performance-Walls-in-Climate-Zones-3-5-Part-2-24-Walls.pdf, Energy Efficiency and the Modern Home Builders Business, Renewed and Retroactive Tax Credit for Builders, Michigan Energy Code Update: Part 2 Compliance Paths. EPDM - OSB 3 decking 3mm expansion gap - needed on T&G? Discussion in ' Roofing and Guttering ' started by benjiman, 17 Mar 2015 . Going to be laying new decking for an EPDM covering. Been reading that a 3mm expansion gap should be kept between the boards. Good luck. "Doesn't swell if you get it covered. Structural fastening systems are only permitted if their use has been approved by the manufacturer. Leave a gap on all joins and fill with acoustic sealant (make sure it's fire resistant too). Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. Kronospan - OSB2 / OSB 3, OSB can be sawn, cut, milled and nailed. Seems like carpenters are taught that a tight fit is ALWAYS better, even if it buried beneath 40 year shingles. The code requires a 3/4" subfloor as a minimum, but there is no maximum until you exceed the physical limits of the structure. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. forests, engineered wood composite products such as OSB have gained a significant trailer liners and recreational vehicle floors. We'd typically nailed a row down completely before laying the next. OSB production is expected to continue to increase in North If they aren't followed, you don't have any warranty. I know that when sub flooring with OSB that it is sugested that you leave an expansion gap of 1/8 inch. There is no swelling in the OSB on the market now, except on cut ends if you don't cover. OSB board sizing is done using two measurements: The first one is a thickness measurement. See our Floor, Roof and Wall Panel Installation Technical Resource Sheet for more information. A general flow chart of OSB production. A simple design of spinning disks is used in the forming of the strands. I wouldnt recommend solid blocking with mechanical fasteners. The best answers are voted up and rise to the top, Not the answer you're looking for? The panels are later sanded to improve their surface roughness. What sizes does OSB come in? I have looked for any information on finding maximum value for gaps between sheathing sheets but cannot find any information. What this does is give you better protection against water than other types of boards, but doesnt require as many chemicals to treat it. We do. OSB is a common material to use when building outdoor decks because it holds up well against weather and movement. If the OSB comes 8', you had better not space, it will destroy your layout! The most popular size for walls is the four-by-eight-foot panel which costs around $15. If you want to post that as an answer, I'll happily accept it. . And they also must have been taught to always ignore written instructions. and Europe. This particular size is also easy to find because its a standard size that lumberyards and home improvement stores typically carry. or if you are doing it yourself you can find suppliers local to you. - London Flat Roofing OSB Expansion and contraction do I leave a gap? OSB Expansion and contraction do I leave a gap? As far a s I know, no gaps needed in 18mm T+G OSB the expansion is built-in. The lower part of the T+G this doesnt meet the other side; however, the top use so I dont understand how that works! Hence my post here. Paul, I must live in a special area of the country, we just don't see it around here! conditions. They are manufactured with an unsanded surface. Learn how the forest sector contributed to the Oklahoma economy in 2020. Can anyone point me to literature on why gapping OSB is necessary and maybe photos of OSB that was not correctly gapped. I don't space decking either. In that I certainly agree with Jack. Don't know why but they've been that way since I started in 1970 +/-. Spelled a lot like Carolina, and also coastal, but I guess we are worlds apart when it comes to our respective lumberyards. You not only have exposure during construction but conditions in the attic can cause expansion of the OSB. The No. You can purchase it for around $20 per sheet which is the standard price. Guidance on the use of OSB in load-bearing applications is given in DD CEN/TS 12872. From J. Lowood. Plywood, too, needs to be spaced 1/8". Which was the first Sci-Fi story to predict obnoxious "robo calls"? Out west they are 92 1/4". Limiting the number of "Instance on Points" in the Viewport, Short story about swapping bodies as a job; the person who hires the main character misuses his body. For example, if you are building a shed, the most common size to use would be to cut it down into four-foot by six feet panels. We have included the original PDF the information is taken from below, for you to download if you desire. Doesn't swell if you get it covered. Oh Man, can I tell you. Webgaps the edges as the floor is assembled. Web3When installing boards with tongue-and-groove joints, leave an expansion gap at walls. In the case of boards with different moisture content the perforator value is recalculated. Food Business License and Permit Costs in Oklahoma: The Good, The Bad and The Mundane, Facilities & Equipment for Food Processing, Food Safety, Quality Management & Sanitation, Regulations, Customer Requirements & Compliance, Challenges of Meeting Oklahoma Farmers' Market Regulations and Varied Requirements, Economic Contribution of Forest Sector in Oklahoma in 2020, Regulatory Landscape for the Direct Marketing of Meat and Poultry in Oklahoma, Division of Agricultural Sciences and Natural Resources. what do U need pictures for, just fire them for not doing what ya tell them to do. toward the press and a cross saw trims the mat to the desired panel length. flow chart of OSB, respectively. No. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. core layers of the mat are oriented opposite each other and sequentially dropped on For example, the five-eighths inch sheet. The thickness of OSB varies depending on the project you are working on. Been reading that a 3mm expansion gap should be kept between the boards. Using T&G OSB this will not be possible. Is that OK and is it due to an expansion gap already being present in the T&G? The primary difference between the moisture-swelling of OSB and plywood is that plywood will return to its original dimensions, OSB will not. Laying an EPDM membrane directly over the panels does pose a challenge: the gaps between panels may telegraph through the membrane and this may be unsightly. as a building material. Some common ones include sheathing grade, construction grade, flooring grade, and industrial grade. Excellence is its own reward! Would you ever say "eat pig" instead of "eat pork"? As with most construction failures, there is no single smoking gun problem and no silver-bullet solution. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I cannot imagine a better lawsuit waiting to happen than stamping sheet goods as requiring spacing, then producing them at a dimension that makes that spacing impossible with standard layout practice. RELATED: How to Smooth OSB Board: A Comprehensive Step by Step Guide. Levelling? If you are doing a residential project, then you will most likely be using an OSB board that is either four feet by eight feet or five feet by nine feet. Installing super dry material From the manufacturer, OSB panels come off the press at 2.5-3% moisture content. This allows for the expansion and contraction to occur at the bottom. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. rev2023.4.21.43403. Rip off the Hardie, 2 saw kerfs at each seam, wait 3 weeks and pray for no rain so it all dries out. When it takes on moisture and begins to warp however, OSB changes permanently. Your problem is not the inspection, is how to reduce the gap, so the flooring is adequately supported. From what I read hear and other forums, osb seems to be the one that everyone complains about. One half-inch OSB board weighs approximately 35 pounds. from the press line and conditioned on a rotating cooler prior to cutting them into I can't tell the difference between them. There's no way around that. Not necessarily a problem, though 3/4" is pretty extreme. We had the house reroofed this year by a roofing company with me replacing the the porch roof sheathing. Does methalox fuel have a coking problem at all? Any consensus on this, or does it not matter that much, providing there IS a gap and it's not mahoosive? I dont think they would have any problems because theyre not subject to the same vapor and temperature differences. The answer to this question depends on the type of project you are working on. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? Peter Benson (Plywood) Limited are an independent timber based sheet material company based in Darwen, Lancashire. application of OSB in building construction. Good advise. In general, Should I Buy (or Retain) Stockers to Graze Wheat Pasture? Our OSB is made with aspen, which sucks up water like a sponge. The second is a width measurement, which tells you how wide it will be after being dried out. Installing without an expansion gap Best practice is to leave a minimum of 1/8 space between panels on the vertical and horizontal edges to allow them to expand. He has pictures and experience in the article. Mills in the South use pine plantation thinning, Southern Pine