OSB is now used for about 70 percent of all floor, wall and roof sheathing in North America. Just wanted some clarification. Customers are choosing OSB to be installed as their roof decking because it can lower the cost of their overall roof installation. OSB panels are one of the most commonly used products for creating subfloor underlays. Should it be a different type of wood? OSB is lightweight, relatively inexpensive, and strong enough to resist bending or breaking should someone walk on the roof. Oriented Strand Board, commonly referred to as OSB, is a type of engineered lumber similar to particle board, formed by adding adhesives and then compressing layers of wood strands. Get help with your home improvement projects. OSB Thickness I'm trying to find the code for min thickness for roof sheathing and I can't seem to find anything. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. Out of Stock Online . There is no reason (other than the roof receiving slate) to use 3/4" CDX. Building codes recognize both plywood and OSB to be alike in their properties and use the phrase \"wood structural panel\" to describe them.However, plywood subfloors are stiffer than OSB by about 10%. Hi Todd, I have a pole barn design structure that had been turned into a livable dwelling with cathedral ceilings using rigid foam between the metal roof and the ceiling sheetrock, I am redoing this and putting a decking down with Tyvek Protec 200 and then reattaching the metal roof and adding circular pest resistant soffit vents at the end rafters of the roof between purlins for ventilation. Item #95338. Oriented Strand Board (OSB) OSB is a type of wood panel comprising of timber strands and should be manufactured in accordance with BS EN 300: Part 3: 1992. One sheet = 32 ft² . Shed roof thickness. Exterior grade plywood is more water resistant than strand board – based on my observations, exposed edges or leaks cause more damage to OSB than to plywood. Thickness or Rating (1) The thickness or rating of roof sheathing on a flat roof used as a walking deck shall conform to either Table 9.23.14.5.A. However, there IS a common reason to upgrade the thickness of the roof sheathing as explained above. To gain permission, click here. The calculation is based on that the Plywood or OSB (Oriented Strand Board) sheets are of a 4' x 8' size. OSB are preferred for non-heavy tiling. R. 18mm was initially chosen for its strength. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. I have some sample two-square rolls of a good synthetic and would be happy to send you one or two if you pay the freight from Ohio. All this said … always adhere to what your roofing manufacturer says. Whether you need OSB products as loadbearing or reinforcing boarding on ceiling joists, in attics, as roof or wall panelling or as flooring, the right thickness depends on the application and the loads they must support. Could a cover the boards with a tarp after boarding for a few weeks to a month before I felt/fiberglass it? Can't decide whether to use 18mm ply for the roof covered in felt or to use 18mm OSB 3 which is £10 a sheet cheaper. The usual recommendation is that OSB/3 or OSB/4 (BS EN 300) should be used in flat roofs. If interested, email me at todd@asktoddmiller.com Should you ever get condensation on the back of the metal panels (unlikely but still possible(, it will quickly mess up the OSB if the OSB is not protected by underlayment. Oriented strand board (OSB) is commonly used as the primary structural sheathing component in residential construction and low rise commercial applications. The more wood chips there are, the thicker the OSB will be. My main concern was sheathing thickness, but will take in all anyone can offer. Roof leaks, of course … but also improper attic ventilation can cause condensation in the roof deck that can cause the OSB to weaken. I’m replacing some knackered 10mm ish T&G that’s had a rought time under some felt with holes in. Some panels have a textured surface, which makes them less slippery when used for roof sheathing. See Store Availability. The only downfall when comparing the two materials is cost. The only building authority in the country that doesn't accept its use is Dade County, Florida. When the grade stamp is covered by roofing, the building inspector will not be able to confirm that the correct OSB roofing panel was used. Model #776391180002. One option is to try some test fasteners in the OSB. I know some places it's 7/16, others 1/2" or 5/8" January 21st, 2010, 01:15 PM #2. Reply. in. 9.5 3/8 18 40 11 7/16 21 46 12 15/32 23 50 15 19/32 29 63 18 23/32 34 76 22 7/8 42 92 28.5 1-1/8 54 120 Notes: My preference is plywood. Using Oriented Strand Board (OSB) for Shed Walls, Floors and Roofs . I have seen far fewer problems with moisture absorption and rot with it compared to OSB. Not Available for Delivery . Your email address will not be published. To be fair, OSB is not exactly best friends with water either. I’d suggest a synthetic underlayment. One option is to try some test fasteners in the OSB. If you're looking for OSB board for roofing, or for most other purposes, we've got what you need at discount price, ready for fast dispatch across the UK. Anyone who thumbs their nose at OSB has never used Advantec 1/2" OSB. Ensure that the product has been duly certified by the British Board of Agrément (BBA) before it is used for your project. It’s the standard for spacing of 24 inches in the rafter, although as mentioned, a 5/8 inch thick is more ideal. About CDX Plywood CDX is a type of veneer plywood that is fabricated by gluing then pressing sheets of wood together to strengthen them. He is president of Isaiah Industries, an organization recognized as one of the world’s leading metal roofing manufacturers. This site uses Akismet to reduce spam. One sheet = 32 ft². Todd is currently Vice President of the MRA (Metal Roofing Association) and a Past Chair of MCA (Metal Construction Association). Does it has to be OSB3 or will OSB2 do? However, OSB is generally considered less resistant to water (it swells in thickness when exposed to moisture) and some people prefer plywood for roofs and subfloors. OSB Boards used for the deck should be: a minimum thickness of 18mm (these will be able to span up to 600mm). Learn how your comment data is processed. Compare; Find My Store . See Store Availability. What Size Plywood Do I Use for a Subfloor? why waste ply on a roof unless its rough shuttering ply - 12mm WBP is perfectly fine - if your feeling really tight, OSB 3 (aka Stirling board) will do the trick. OSB is so strong in fact that it is now used for about 70% of all floor, wall and roof sheathing in North America and there are two different types of OSB, OSB2 and OSB3. Using oriented strand board osb for oriented strand board osb vs thickness osb to use under shingles oriented strand board building code for roof sheathing roof sheathing installation tips from. 9mm, 11mm or 18mm. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. Exterior grade plywood and OSB are the two main choices for roofing. While strand board is stronger in shear force, plywood of the same thickness is lighter – easier to lift on your own. … Home | Roofing Information | Is OSB Acceptable as Roof Decking for Metal Roofing? Todd Miller 8510 Industry Park Drive Piqua, OH 45356 (937) 773-9840 ©2009 – 2020 AskToddMiller.com Site Maintained by StoryRidge Marketing. Always pay attention to the thickness of the boards, and work accordingly with your materials. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. Thicknesses range from 5/16 to 3/4 inch, and the proper one to use depends on the spacing of the rafters. Moisture causes the edges to swell more than the centers, and this can produce noticeable ridges under thin roof coverings such as asphalt tiles. Post by The Z'eer » Tue Feb 20, 2018 7:10 pm. We have the right sized OSB3 board for almost every job. Building codes, the Engineered Wood Association, architects and most builders rate plywood and oriented strand board (OBS sheathing) equal in strength and durability. ‘Enhanced’ 23/32-inch-thick OSB subfloor panels show reduced thickness swell, compared with regular OSB. We are checking into a metal roof and we have a question that needs to be clarified. Item #70213. 99 / box. As a landscape builder, he helped establish two gardening companies. The thickness of OSB is controlled the same way plywood is. Osb Thickness For Roof. This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. 92. for subfloors. which thickness OSB for a shed roof i posted 7/16 OSB on the walls of my 11x9 shed, now i am ready to make the roof. kg lb. Todd Miller has spent his entire career in the metal building products manufacturing industry. Proper Subflooring for Wood on Second Floor, How to Lay a Wood Underlayment for Wood Flooring. I wouldn't spend extra for brand on something that is purely structural in nature and gets covered up. 8 Tips For Getting The Best Out Of Your Oriented Strand Board Osb. laid with staggered joints. It banned OSB after Hurricane Andrew caused extensive damage to rooftops in 1992, citing OSB's inferior ability to hold nails. or Table 9.23.15.7.B. Thickness or Rating (1) The thickness or rating of roof sheathing on a flat roof used as a walking deck shall conform to either Table 9.23.14.5.A. View Profile View Forum Posts Private Message View Articles Super Moderator Join Date Sep 2002 Posts 7,451. The calculation is based on that the Plywood or OSB (Oriented Strand Board) sheets are of a 4' x 8' size. Tom can help. Full Member. The Miami-Dade County Board of County Commissioners banned OSB for use as roof sheathing after Hurricane Andrew destroyed thousands of homes in 1992. I've never used commodity OSB on a roof but it's probably fine in 5/8" thickness, and possibly in 1/2" thickness. Typically 3/4"(18mm) for floors and 3/8" (9mm) for walls and 1/2" (11mm) roof. How To Install Osb Sheathing Installation Instructions Guide Roof8 Tips For Getting The Best Out Of Your Oriented Strand Board OsbWhat Thickness Osb To Use […] Is OSB Acceptable as Roof Decking for Metal Roofing? So I will try and simplify what you need to know. Another issue that many people encounter is what size plywood the roof may need. Using Oriented Strand Board is a tested way of reducing costs for building your shed roof, walls and floor. The choice of Plywood should be exterior grade per British Standard (BS) 5268-2, WBP (Water & Boil Proof) to BS EN 636-2:1997. Tom can help. or Table 9.23.14.5.B. Tom The typical thickness range for sheathing is 3/8 to 3/4 inch. Timbers and firrings all on, 100mm insulation has to go on followed by 18mm osb, im not sure if to put insulation on then offer up and cut fascia boards level with top of insulation, then lay osb on overlapping the fascia so i can mark them underneath then cut. It can be used for the project once the roofing contractor confirms its suitability for the work. Item #12215. Sounds like a great project! OSB has its advantages. Browse by Category . Oriented strand board (OSB) Made up of multiple layers of wood strands compressed at odd angles to each other and bound with water-resistant adhesives. The problem, though, is that OSB tends to deteriorate fairly rapidly if exposed to moisture, losing fastener pull-out resistance. Table 1: OSB – Thicknesses and Weights OSB (CSA O325) Thickness 1220 x 2440 mm (4 x 8 L) Panel Weight mm. or Table 9.23.14.5.B. “One, it’s more common than plywood,” he points out. Donboy. It should have a minimum thickness of 18mm. OSB sheathing costs a few dollars less per sheet than 1/2-in. For shed construction there are two commonly used grades of OSB… Learn more about what you want and what you need in a new roof, before you invite the contractor into your home. We heard that the metal will not stay on as well if you have OSB roof decking. Or just have a look at the table below. sam_underhill. Table 1: OSB – Thicknesses and Weights OSB (CSA O325) Thickness 1220 x 2440 mm (4 x 8 L) Panel Weight mm. If you get 45 or more pounds of pull out resistance, that’s considered acceptable for most applications. Required fields are marked *. Osb Thickness For Roof. Because of the way it's constructed, OSB has less tendency to swell and contract with changing moisture conditions than plywood. Comparing plywood and OSB View Details. Every building authority in the United States, except for one, allows the use of OSB for roof sheathing. April 3, 2017 | Filed under: Metal Roofing, Roofing Answers, Roofing Installation, Roofing Materials. This old work shed took just under 7 bundles of shingles to do this shed. 101 months. View Details. I’m sheeting the rafters with osb than tin. The oriented strand board (OSB)—This board type of layers and strands of wood, adhered together to form a board. Through his website, he strives to raise the bar on standards and practices to provide property owners with the best possible products for successful roofing projects. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. A building '' or 5/8 '' January 21st, 2010, 01:15 PM # 2 it also has tendency. Was wondering if I should use some sort of Underlayment using contractors to a. And metal Roofing, in a new roof, using clips you include a link to... As does plywood, and my father-in-law ( who lives in Minnesota ) says that we should have 5/8.! Mimic plywood or some other thickness improvement projects board is resistant to water, with a after... Z'Eer » Tue Feb 20, 2018 7:10 PM can offer 2020 AskToddMiller.com Maintained. 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The boards, and decks few dollars less per sheet than 1/2-in x 1 inch ThermoSmart Subfloor Panel 1!

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