> Wait a minute, the precuts in SC were 93". It only takes a minute to sign up. 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 Home Does blocking increase the potential for buckling/warping because the panel is then fully surrounded by fasteners? It may not display this or other websites correctly. I can confidently You're rightthe stuff is already swelled up to full size when you get it. Since OSB is manufactured from small diameter trees, it has a very low negative impact Let me guess, you're from the Carolinas, right? 1997. JavaScript is disabled. mostly the swelling is only minor enough to telegraph the sheet positions and edges through cheaper three tab shingles. 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. Post was not sent - check your email addresses! - 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! But not until many years? OSB as compared to plywood. We however cannot guarantee any of the contents. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. RELATED: How to Smooth OSB Board: A Comprehensive Step by Step Guide. To learn more, see our tips on writing great answers. Boards with straight edges need 2-3 mm dilatation gap at the edges of the boards for possible moisture expansion. Thanks for contributing an answer to Home Improvement Stack Exchange! Rip off the Hardie, 2 saw kerfs at each seam, wait 3 weeks and pray for no rain so it all dries out. No, I'm not kidding. 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. I did not gap and it bit me, But i did find when the cut ends were not gapped they swelled but the painted ones never did. Back of a 6 bay garage, framed and sheathed with the OSB jammed tight, not occupied or insulated space so no Typar. Just make sure you have a competent uplift load path. Looked like ####. An ounce of prevention. http://www.hammerzone.com/archives/flooring/hardwood/prep1/subfloor.htm. Over time it was easy to see the bowing that occurred. Out west they are 92 1/4". The best answers are voted up and rise to the top, Not the answer you're looking for? They just gap the walls, no roofs. Larger They are manufactured with an unsanded surface. Already a Member? Like drilling a dry hole for oil or NOT striking a rich gold vein. With OSB at about 6 bucks a sheet, why would I use fir? Woodrated.com takes part in the Amazon Services LLC Associates Affiliate Program, which gives content creators an opportunity to earn advertising fees by advertising and linking to Amazon.com. I'm all mixed up. Joe Cook and Travis Brungardt detail the benefits of using the Slicker Max Rainscreen from Benjamin Obdyke to protect the siding of the FHB House. Here's how a journeyman explained it to me way back in 1977 when I was a young apprentice:92 1/4" + 4 1/2" (one bottom plate and two top plates) = 96 3/4". Otherwise you get that irritating layout creep. Which one to choose? Suggested Materials for Warm Deck Flat Roof, Is it ok to Nail into the EDGE of OSB 3 18mm T&G (for Fascia/drip batten). However, brief periods of exposure to rain during the installation of "A lot of the reported cases of swelling and failure are on garages where the moisture gets to it from the underside. Your problem is not the inspection, is how to reduce the gap, so the flooring is adequately supported. When properly installed, OSB is a durable and versatile material. It happens to get cold enough to condense inside the OSB which causes it to swell. Matt. 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. tongue and groove Excellence is its own reward! . Engineered Wood Products. Never said you did, and it is nice to use fir as it is lighter, alass that is not in the cards. 2.2: Unusual Cases Structural fastening systems are only permitted if their use has been approved by the manufacturer. This allows for the expansion and contraction to occur at the bottom. 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. For a better experience, please enable JavaScript in your browser before proceeding. The remedy should be as simple as pulling the nail out. Never had a problem with OSB. Face and No wonder you didn't understand me. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. OSB can be used in several different applications due to its strength and lightweight nature. As a general rule, cutting speeds should be lower than for conventional wood. OSB primarily use lodgepole pine logs averaging 10 to 12 inches in diameter at the Sound insulation / isolation after knocking hole in wall, Impact of sound insulation on kids bedroom above cinema room. for biological microorganisms, such as fungus. flow chart of OSB, respectively. He has pictures and experience in the article. Tiling over old 2x6 tongue and groove subfloor. In a general OSB plant, forming lines are about 6- to 8-feet wide. -Dik. Rain Water Coming Through Expansion Gap in OSB The roofing company and conditions. I assume I would leave the same gap all around, on both the OSB and the plasterboard? 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.) in a drum-type rotating blender. core layers of the mat are oriented opposite each other and sequentially dropped on If the gaps are filled, whether with sawdust, other debris, or an intentional sealant, then their ability to absorb expansion will be compromised. Make up a little demo showing size change using a balloon with hot air (oh, thats what make those balloons expand and go up, up and away!). 2 Answers Sorted by: 2 You could add 3/4" sheets of plywood/OSB to the subfloor if you wanted. Fill OSB gaps with something like 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. COFORD 2021 WOOD TECHNOLOGY IRELAND. NO. 12 KRONOSPAN PROPERTIES FOR LOAD-BEARING BOARDS FOR USE IN DRY CONDITIONS (type OSB 2): KRONOSPAN PROPERTIES FOR LOAD-BEARING BOARDS FOR USE IN HUMID CONDITIONS (type OSB 3): GENERAL ADVICE Can anyone point me to literature on why gapping OSB is necessary and maybe photos of OSB that was not correctly gapped. Strands coated with Put up new Hardie and shim the #### out of it and now it looks half way decent. Wall sheathing should usually be at least 7/16-inch thick, but in some cases, 1/4-inch may be enough. I've never had a problem not spacing the fir sheathing on a roof in 25 years. :) (expansion, contraction, angry homeowners), "creaking, angry homeowners. How to properly install tongue and groove plywood subfloor? 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. Watch it happen on a wall with 24" stud spacings!! Can the game be left in an invalid state if all state-based actions are replaced? Sources of moisture range from rain and snow to the fumes of construction heaters. Ive done a lot of pole barns and this is the first time Ive had this problem. You are using an out of date browser. 28 Apr 2023 11:01:29 Underlayment? "Doesn't swell if you get it covered. such as profiling with tongue and groove edges or the raised screen pattern on one All we use is firaround here. What sizes does OSB come in? The plywood manufacturers recommend providing a 1/8 inch gap between sheets of any structural panel to absorb any movement due to thermal or moisture caused expansion. 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. Should Weyerhaeuser OSB sheathing be installed How to check for #1 being either `d` or `h` with latex3? Hope that helps. Save my name, email, and website in this browser for the next time I comment. Roofer insists warm-deck roof needs an air-gap is he right, does it matter? There are four basic regulatory avenues for the direct marketing of meat/poultry, and each category has respective specifications and limitations within. I've done it like this for 25 years. "Man, they're the worst!AitchKay. Please let us know here why this post is inappropriate. application of OSB in building construction. Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Years ago a mining process company did its research for a client and the client got a report the equivelent to penciled info on a legal pad in the mail. Figure 3. One by means that the wood measures one inch thick, while a five by is five inches thick. The advantages of using EGGER OSB is as follows: High dimensional stability High static load Optimised for application Comprehensive stock range available Would you ever say "eat pig" instead of "eat pork"? This was done during an 8 week dry stretch. How to have multiple colors with a single material on a single object? 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. 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 They warped bad. Spelled a lot like Carolina, and also coastal, but I guess we are worlds apart when it comes to our respective lumberyards. Does OSB actually indicate on the panel that it must be gapped? You need to have a blower door test and thermal infrared camera inspection to determine specifics. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? As the humidity moves through an insulated wall assembly, the temperature drops (during heating season) as it approaches the exterior sheathing. Should GC "Exposure 1" 3/4-in plywood be let to dry before screwing down as a deck / flat roof? OSB: Pros, Cons of Using Oriented Strand Board Out in the Open Salim Hiziroglu, Oriented Strand Board as a Building Material. I put some scrim tape over half the roof, and nothing over the other half. The cost of OSB varies depending on the size and thickness of the sheets. breast height (DBH). All information on this page is provided in good faith. 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. You could pull it out partially, but that does make a mean trip hazard. Can I use my Coinbase address to receive bitcoin? Don't know why but they've been that way since I started in 1970 +/-. Levelling? I know that when sub flooring with OSB that it is sugested that you leave an expansion gap of 1/8 inch. So, where are you from? I use nothing but Advantech on the floors. j. A similar question once here at BT brought out a couple photos and stories by guys who had learned the hard way. This reaction causes a break down of OSB/s ability to permeate or seal air and moisture or it's perm rating making it higher, it's "moisture content" or ability to store and manage water lower, shown in the data sheets due to the fact that the manufactures resin and binder contents are very low amounts to cut cost. That's not a gap--it's a nearly complete lack of engagement. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. 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. Im spaning 2 ft 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. With floating floors, the expansion gap should be 12 mm wide. Thanks for bringing this info back; if you think it's the best answer you can mark it as "accepted" by clicking the checkmark. It stands for Oriented Strand Board, which means that its not your typical plywood or particleboard. Can I make the contractor redo a roofing job because he didn't replace delaminated plywood? Not moisture. in both commercial and residential building. However, it is water-resistant, which means it can handle some moisture without warping or breaking down. Most products are minimally effected today, but there are many brands, some may not. This particular size is also easy to find because its a standard size that lumberyards and home improvement stores typically carry. The most popular size for walls is the four-by-eight-foot panel which costs around $15. This whole talking-to-you thing is like double punishment. sheathing - Should expansion gaps in an OSB3 roof be While most of these sources seem unavoidable, they are at least manageable with good site management and timing. rev2023.4.21.43403. Nice article. 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 total energies differ across different software, how do I decide which software to use? In the case of boards with different moisture content the perforator value is recalculated. OSB board comes in thicknesses of inch up to inches thick. 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 For example, the five-eighths inch sheet. Without one, the sheets can get whacky. It takes a lot of force to overcome the friction of that rough wood when inserting tongue into groove. If they aren't followed, you don't have any warranty. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. If used on a roof and exposed at all to the weather, OSB cut edges should be field sealed. That development was built during a very rainy summer. Europe's busiest forums, with independent news and expert reviews, for TVs, Home Cinema, Hi-Fi, Movies, Gaming, Tech and more. 28 Apr 2023 11:01:29 Restoration Guide I thought you had specialty sheathing crews for that, or am I remembering somebody else? Oriented Strand Board as a Building Material Osb forests, engineered wood composite products such as OSB have gained a significant The length is 9 mm, and the width is 3/8 inch. This will give you the actual size of the board after it has been dried and cut, which means that it may not be exact when you purchase an OSB sheet. Today, total OSB production in North America is approximately 706 million ft 3 (20 million m 3 ), and Has there been any problems with OSB I-beams buckling? are two types of water-resistant resin commonly used as binder. It may not display this or other websites correctly. OSB 3 decking 3mm expansion gap - needed Most OSB panels also are treated with a sealant WebThe number of OSB mills increased by more than 50 percent from 1990 to 1997. 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. Using T&G OSB this will not be possible. Registration on or use of this site constitutes acceptance of our Privacy Policy. 2023 The Taunton Press, Inc. All rights reserved. This can also mean that there might be some discrepancy between what your store is selling and the actual size of an OSB board. 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. Why would I not tell the truth. For years now I have gone back after the roof is sheeted and used a thin kerf blade and cut the butt joints of the osb. 3mm-5mm expansion gaps between each board at every join and a 5mm-8mm gap around the edge between the boards and the wall. Can OSB Board be Used Outside? The most common thickness is either a five or seven-eighths of an inch sheet; these come out to about one and three-quarters inches total after installing it into your project space. For a better experience, please enable JavaScript in your browser before proceeding. Webgaps the edges as the floor is assembled. With some understanding of the physical properties of OSB, we can determine the most likely cause. dry storage pallets and industrial tabletops. Table 1. This arrangement cannot use the sheathing for it. This may not seem like very much of a difference, but its four times thicker. What are the different grades of the OSB Board? Most construction lumber equalizes to 9-12% which means that the material will be taking on moisture once it leaves the plant. ButIf you don't space it, you are going to have trouble with buckling walls if it gets wet. If there is a gap of 3/8" to 3/4", that means: (1) The framing is not plumb, (2) the sheathing is not plumb, or (3) neither is plumb. 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). Guidance on the use of OSB in load-bearing applications is given in DD CEN/TS 12872. The boards should be stored in their intended installation area for a minimum of 48 hours to acclimatise to the surrounding temperature and humidity. One of the most common questions we get asked is what size OSB board I need for my project. Does methalox fuel have a coking problem at all? Close this window and log in. I am installing subfloor in a old house attic. Good advise. That was the only thing a client saw from the company. 2 Answers. An expansion gap of 2-3mm provided between all adjoining boards when fixing to supports; the gap must be continuous on all 4 edges of each panel; An expansion gap of 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. Installing vertical panels While some manufacturers say its okay, it doesnt really play out well in the real world. The thickness of sheathing panels is typically 5/16 inch . Which ability is most related to insanity: Wisdom, Charisma, Constitution, or Intelligence? An expansion gap of 1/8 inch was used and the areas I felt were too tight I ran the skillsaw along the seam with the blade set at 3/4 inch. Like the old "because I said so" you got as a kid from your Mom. determining properties of the panel. 1/8" gap between OSB sheeting to allow for expansion? Thickness: The thickness of the OSB board will determine how strong it is. From what I read hear and other forums, osb seems to be the one that everyone complains about. If the sheathing panels are butted flat together with no gap, the panels will not only buckle between the studs, but will crush along the edges causing a small ridge line. A decline in plywood manufacturing in many countries, due Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. My phone's touchscreen is damaged. Click Here to join Eng-Tips and talk with other members! I know that recommended gap for expansion of sheathing is 1/8" to 1/4" minimum but what I found on site was excessive. See Figure 1. This is a particular problem with the OSB products; these also swell at the edges if exposed to excessive moisture. Most of the ripples have now gone. The mat is carried I do see osb on some developments, but people who I work for use fir. It could help, but I haven't found it necessary. to OSB, which are almost comparable to plywood. b2h. PS 2 bond classification. say that I expect to be a life-long subscriber." 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. No, OSB is not waterproof. How to combine several legends in one frame? 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). Great work by London GRP Roofing! 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. APA recommends spacing all sheetstock 1/8" at both long and short edges (a 10d box nail is perfect as a guide). You not only have exposure during construction but conditions in the attic can cause expansion of the OSB. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Learn how the forest sector contributed to the Oklahoma economy in 2020. I dont have any literature, but these are some of the reasons to gap. 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. Starting life in 1983 and have successfully provided a comprehensive service covering all aspects of wood based panel products. Can someone explain why this point is giving me 8.3V? 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? That report "was" the company to them. Everything You Need to Know, What To Clean Wood With: Four Surefire Options, OSB vs plywood subfloors: Which Makes a Better Subfloor? Do not try to drive them tight, although in some cases it might be needed in order to keep a straight run. Unfortunately, once OSB changes shape, it never goes back. Sheets must have a 1/8-inch expansion gap between them and should be secured to the rafters with 8d nails. If it isn't you'll have noise and/or flex, things the T&G arrangement is meant to prevent. Some of the physical and mechanical properties of a typical OSB. With this approach to managing "For both wood or concrete roofs, caulk all gaps greater than 1/4 as well as transitions between the roof and walls or skylights." Vinyl Siding By Similar to other wood products, OSB also is prone to decay when conditions are optimum While T&G OSB will not go completely tight on the surface (that's how it's designed), you need it America and Europe and have the main share in the structural wood composite market. Word order in a sentence with two clauses, Using an Ohm Meter to test for bonding of a subpanel. I encourage you to download and carefully read a recently published wall building guide. Problems can be avoided by constructing walls with more robust material profiles and managing interior moisture levels through proper mechanical ventilation. Anything else swells. When humid air is heated, it creates a difference in vapor pressure causing the humidity to be forced through permeable materials. OSB board comes in a variety of sizes. This particular size is also easy to find because its a standard size that lumberyards and home improvement stores typically carry. pressure of 650 to 800 psi for approximately 4 to 6 minutes. Doesn't swell if you get it covered. Generally, strand size is approximately 0.5 inch by 3 inches 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. Maybe lumber yards should start cutting studs at 92 1/2" so we can all be busy cutting that extra 1/4" off, too. However, the membrane tightens up with time anyway. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. You can expect a homeowner to have something to say about this situation and they aren't going to call your employee, are they. To find the size that is right for your project, you will need to know what type of project its going into. It's because I've been nailing too close to the groove. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. I use a 8d nail. Some builders just run a bead of Great Stuff Foam along the butt joint. 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. Make sure you follow the proper nailing pattern required in your area. When I have a say in what material to use, I use fir also. Required fields are marked *. WebUpdated EGGER OSB 3 boards according to EN 300 are multi-purpose boards and can be used for numerous applications in dry and humid conditions. > 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. Well, this depends on what type you are purchasing. And, as always, sheathing joints should be overlapped. However, if you are roofing a shed, the most common size would be to cut it down into four-foot by eight-foot panels. Leave a gap on all joins and fill with acoustic sealant (make sure it's fire resistant too). However, if you are roofing a shed, the most common size would be to cut it down into four-foot by eight-foot panels. 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. Germany - register.certmark.org compared to plywood and its higher thickness swelling than plywood under the extreme Our OSB is made with aspen, which sucks up water like a sponge. frames, decorative wall paneling, shelving, packaging and crating, pallet manufacture, Hard to diagnose from your description, but if you can find a good HERS Rater in your area, they may be able to help. 5. In OSB manufacturing, phenol formaldehyde (PF) and diphenylmethane diisocyanate (MDI) By joining you are opting in to receive e-mail.
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