:) (expansion, contraction, angry homeowners), "creaking, angry homeowners. 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. They are manufactured with an unsanded surface. 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). 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 How to repair/replace old tongue and groove plank subfloor in bathroom? I can confidently Hence my post here. You not only have exposure during construction but conditions in the attic can cause expansion of the OSB. I am installing subfloor in a old house attic. It happens to get cold enough to condense inside the OSB which causes it to swell. I would guess not .but would like to know the practice. I've never personally had a problem with OSB. to limited large log supplies and environmental concerns, will increase production By That said, we always used BIG hammers--six pound sledges--along with a "beater block" consisting of a 3-5' 2x4. If the time between the OSB is made and the time it is installed is too short, or if the material is stacked and stored in a way that prevents the moisture level equalization, then it might be installed dry and will equalize after installation. As the name implies, Oriented Strand Board is made of flakes of wood which are oriented in an engineered pattern to provide strength and allow for expansion in a planned direction. in both commercial and residential building. - M.K. plants capacity. 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 Its a bit technical , but the gist is that you need to keep the OSB warm with outboard foam, and you need to build an airtight wall that has some vapor permeability. 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. I don't know as I never use OSB for sheathing, just ply which indeed does have the stamp that says it must be. Were they supposed to be braced or shear walls? Click Here to join Eng-Tips and talk with other members! There are four basic regulatory avenues for the direct marketing of meat/poultry, and each category has respective specifications and limitations within. 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. > You must log in or register to reply here. Always used sheets "sized for spacing". Good advise. For example, they might suggest applying some kind of tape over the OSB joint gaps and possibly applying a mastic over the tape to smooth it further. Leave a gap on all joins and fill with acoustic sealant (make sure it's fire resistant too). The number of OSB mills increased by more than 50 percent from 1990 to 1997. 28 Apr 2023 11:01:29 Why is it shorter than a normal address? This includes everything from sheds, decks, fences, or even roofs where it will hold up well against weather and movement making it the perfect material for any project that you have going. 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. Some just use the blade on their combo square, others have something made up. sanded, it can even be used as substrate for overlays for special structural applications. Any standard timber joints can be used for. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Thank you so much frammer 52. If total energies differ across different software, how do I decide which software to use? See the recommendations for installing temporary Expansion Joints for Floors in Large Buildings on page 3. Unfortunately, once OSB changes shape, it never goes back. An OSB board is a type of engineered wood made up of cross-laminated layers. Europe's busiest forums, with independent news and expert reviews, for TVs, Home Cinema, Hi-Fi, Movies, Gaming, Tech and more. Website Designed With Stu. Individual What Is Standard Osb Thickness. The same thing can happen if roofing shingles are kept too tight to each other. A sheet of OSB typically comes in four-by-eight-foot panels, but it can also come in other sizes such as four-by-ten feet or even five-by-ten feet. Thanks for bringing this info back; if you think it's the best answer you can mark it as "accepted" by clicking the checkmark. Hope that helps. It takes a lot of force to overcome the friction of that rough wood when inserting tongue into groove. Technical Datasheets I dont think they would have any problems because theyre not subject to the same vapor and temperature differences. All this BS with OSB makes me wonder why people keep using it and not installing it right, or when installing it right you still have problems. However, if you are roofing a shed, the most common size would be to cut it down into four-foot by eight-foot panels. WebOSB 3 Is designed for use where a high performance board is required which provides dimensional stability and load bearing capabilities especially suited for use in humid Certain processes, This particular size is also easy to find because its a standard size that lumberyards and home improvement stores typically carry. Joints must always be on joists. The nails should be spaced 6 inches around the edges of a sheet and 12 inches in the middle. When a gnoll vampire assumes its hyena form, do its HP change? Login. The cost of OSB varies depending on the size and thickness of the sheets. Jon Blakemore RappahannockINC.com Fredericksburg, VA, Whoops, a lot of my response above to frammer had answers to your questions - sorry. That report "was" the company to them. I have a few employees that believe that they know better than I and want to push them tight together when the boss is not around. One half-inch OSB board weighs approximately 35 pounds. We do. Promoting, selling, recruiting, coursework and thesis posting is forbidden. I don't space decking either. If it isn't you'll have noise and/or flex, things the T&G arrangement is meant to prevent. mostly the swelling is only minor enough to telegraph the sheet positions and edges through cheaper three tab shingles. 94969.19 In the beginning there was Breaktime "Maybe lumber yards should start cutting studs at 92 1/2" so we can all be busy cutting that extra 1/4" off, too.". loor oo and all anel nstallation - Weyerhaeuser Wait a minute, the precuts in SC were 93". Never. strands are used for the face layers while the smaller strands are laid out in the the conveyor belt. 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. WebThe expansion or contraction of OSB with temperature and humidity is uniform, so it is an excellent choice for large projects that require panels to fit tightly together, such as Without one, the sheets can get whacky. The answer to this question depends on the type of project you are working on. A minor scale definition: am I missing something? on the panel edges to reduce moisture penetration during the service life. I know that when sub flooring with OSB that it is sugested that you leave an expansion gap of 1/8 inch. Make sure you follow the proper nailing pattern required in your area. It is recommended to leave a 1/8-inch gap between panels during installation to prevent All OSB has a coating to prevent. Weyerhauser's stuff is just shy of 48" wide but it's exactly 96" long, which means that it works fine to gap it out on the long edges - usually makes no difference there anyway - but if your structure is more than 24' long you need to trim the sheet to length every 3rd one or so in order to maintain truss or stud spacing. for biological microorganisms, such as fungus. Look, just send me to my drawer. 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. Are you a trade or supplier? OSB production is expected to continue to increase in North Check for any damages before tting. Sorry, your blog cannot share posts by email. A schematic illustrating strand orientation of a typical OSB. I'm all mixed up. Should I Use 3/4 Inch Tongue and Groove OSB for Exterior Sheathing. It's code where I'm from. The size that you need will depend on the project you are working on. This was done during an 8 week dry stretch. Spelled a lot like Carolina, and also coastal, but I guess we are worlds apart when it comes to our respective lumberyards. As for why it happens in the winter; vapor drive is a temperature driven event meaning that the colder it is, the more vapor pressure there is with warm humid air pushing through the walls. Sized for Spacing indicates the panel has been sized to allow for expansion gap between panels. If the temperature drops below the dew point, and the material is vapor permeable, then it is possible to collect condensed moisture within the sheathing. A helpful guide that clarifies food business categories with their corresponding definitions and license fees. one of these resins are ready for mat formation, which is the most important process Never said you did, and it is nice to use fir as it is lighter, alass that is not in the cards. The best answers are voted up and rise to the top, Not the answer you're looking for? So for starters there is some type of lining between the framing and the sheathing similar to the thickness and flexibility of sand paper that was not affixed to the osb overlapping in the cavities in some areas allowing wind to come through so I Applied dynafles 230 sealing/caulk and applied flashing tape to try and make it a continuous barrier. Im spaning 2 ft Feel any better? Rather than think climate change and the corona virus as science, think of it as the wrath of God. The width of an OSB board is usually between 0.75 and 11 inches, depending on the manufacturer and/or style you are looking for. PS 2 bond classification. Roong 11mm, 15mm, 18mm / Sarking / Site hoardings / Timber Frame Buildings 8mm, 9mm and 11mm / Flooring 15 and 18mm, These values are characterised in the material corresponding to a relative humidity of 65% and temperature of 20 C, These values are characterised between and within boards. I've done it like this for 25 years. To drive it in, keep a 2 by 4 ft long or more to protect the groove side that you are driving against. If you've got OSB (or plywood) that doesn't swell, you are in the minority! So say the rafter shrinks to 1 7/16 from 1 9/16.so a 1/8 inch collision. Roofer insists warm-deck roof needs an air-gap is he right, does it matter? WebThe number of OSB mills increased by more than 50 percent from 1990 to 1997. OSB primarily use lodgepole pine logs averaging 10 to 12 inches in diameter at the There is no swelling in the OSB on the market now, except on cut ends if you don't cover. Face and Fill OSB gaps with something like For a better experience, please enable JavaScript in your browser before proceeding. Your email address will not be published. ; floor joist span should be designed conservatively (building code minimum is not conservative), Webgaps the edges as the floor is assembled. As long as it's not a shear wall, then I can't see how it would be a structural issue. Before 9' and 10' ceilings got so popular (ridiculous, if you ask me) the only precut stud measurement to be found out here was 92 1/4". Its like the turkey loaf of are two types of water-resistant resin commonly used as binder. Wall sheathing should usually be at least 7/16-inch thick, but in some cases, 1/4-inch may be enough. Our OSB is made with aspen, which sucks up water like a sponge. to 5 to 10 percent moisture in large, rotating single-pass or triple-pass dryers with 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. Feel free to get ahold of me if you need more clarification or advice. In our climate zone (Michigan and PA look to be the same) the most robust wall seems to be 24 with 1 of foam over OSB exterior sheathing. Plywood is much worse than OSB in my opinion. Installing super dry material From the manufacturer, OSB panels come off the press at 2.5-3% moisture content. Ask the membrane supplier for a recommendation. If the surface of OSB is extensively I can't tell the difference between them. I haven't been burned by it myself, but I used to drive by a cheap housing development where if the sun was right, you could see every sheet outlined through the shingles. The one-by-five-eighths-inch board is also the most common size used for building a chicken coop because of its sturdiness and ability to protect against predators. Websuitable expansion gaps Wood Based Panels OSB (Oriented Strand Board) Introduction This information sheet relates primarily to OSB panels used in construction OSB/3 is widely used in construction for site hoarding, flooring, roof panels and for wall panel sheathing in timber Today, total OSB production in North America is approximately 706 million ft 3 (20 million m 3 ), and Want to know where thehabit of doing 16" oncenter layout came from? With floating floors, the expansion gap should be 12 mm wide. Manufacturers Documents For example, a four-by-eight-foot panel that is half an inch thick can cost around $20. When installing in a running board pattern, do you recommend blocking at the horizontal joints between panels? What tools should I use to remove the tongue and groove from floorboards? If you are going to space 1/8in on a 96in osb roof sheating how do you lay out 60 ft of truss's to compsate for that mutipling 1/8 in? Vinyl Siding Not moisture. 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. It doesn't have anything to do with swelling. However, personal experience has With some understanding of the physical properties of OSB, we can determine the most likely cause. 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 however cannot guarantee any of the contents. An employee would get a warning or two before they were no longer an employee. On roofs always horizontal Have never had any problems with buckling Until recent last April removed old siding from small split level home thermo ply was rotted so we removed thermo ply installed osb 2 x4 walls 2 ft centers vertical same way thermo ply was installed after osb was installed we installed house wrap then siding Job looked perfect In dec or Jan received call from home owner telling me siding was buckling It is not siding Why would this happen on this job and not others confused we did install a layer of house wrap and a layer of 3/8 fanfold foam per customers request could it be condinsation/ I thought maybe they changed glue in osb have never had any problems in past and why did it only buckle in winter months when furnace was running driving me crazy. Any consensus on this, or does it not matter that much, providing there IS a gap and it's not mahoosive? Why do you think they stamp the spacing infoall over the stuff? We'd typically nailed a row down completely before laying the next. It may not display this or other websites correctly. This can transfer to a visible bump in the roofing. . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Word order in a sentence with two clauses, Using an Ohm Meter to test for bonding of a subpanel. Can I make the contractor redo a roofing job because he didn't replace delaminated plywood? I have just been to review the floor framing of a site. I dont have any literature, but these are some of the reasons to gap. "I have learned so much thanks to the searchable articles on the FHB website. Seems like carpenters are taught that a tight fit is ALWAYS better, even if it buried beneath 40 year shingles. I can tell many horror stories about OSB not being gapped and seeing that happen. 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. Great work by London GRP Roofing! He has pictures and experience in the article. 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. 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. Already a member? See our Floor, Roof and Wall Panel Installation Technical Resource Sheet for more information. Typical press parameters include a temperature of 400 to 425oF and a If youve been around the building industry for the last twenty years or so, youve seen plywood being used less and Oriented Strand Board (OSB) being used more for sheathing on walls, roofs, and sub-floors. That's great stuff. Most construction lumber equalizes to 9-12% which means that the material will be taking on moisture once it leaves the plant. sheathing - Should expansion gaps in an OSB3 roof be 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 any buckling in the roof deck. The tongue and groove (T&G) of the sheets should be driven snug. Ive done a lot of pole barns and this is the first time Ive had this problem. When selecting an OSB board for your project, it is important to consider the following key features: Size: The size of the OSB board will determine how much space it 2 Answers. Registration on or use of this site constitutes acceptance of our Privacy Policy. Spacing is an APA recommendation intended to minimize the risk of panel buckling when panels are exposed to moisture during construction or acclimatize to a higher moisture content after installation. Hard to diagnose from your description, but if you can find a good HERS Rater in your area, they may be able to help. Some common ones include sheathing grade, construction grade, flooring grade, and industrial grade. So the contraction of the joist brings the OSB onto a collision course? 1 Home Entertainment Tech Resource. I also agree that you need to start out straight. Your email address will not be published. be so great. And, as always, sheathing joints should be overlapped. Why does OSB Buckle and Warp? - Great Lakes Home Wet OSB - how much water can it take By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. This site is protected by reCAPTCHA and the Google. How can I remove just one tongue-and-groove subfloor board? Most of the ripples have now gone. WebThe risk is that even a small amount of expansion with no gap can cause your floor to form a hump that can in turn cause your LVP plank to crack (worst case) or damage the tongue and groove (not really much better case, but can be manageable.) Does blocking increase the potential for buckling/warping because the panel is then fully surrounded by fasteners? The boards should be stored in their intended installation area for a minimum of 48 hours to acclimatise to the surrounding temperature and humidity. The reason for this is that it will hold up well against weather and movement since there are not a lot of moving parts or openings. Copyright 1998-2023 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. Sagging between trusses yes. core layers of the mat are oriented opposite each other and sequentially dropped on OSB boards come in a variety of sizes, thicknesses, and grades to choose from. 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.