Dimensions include: OSB board 18mm; OSB board 11mm. OSB comes in 4-by-8-foot sheets, as does plywood, but the manufacturing process allows the production of longer and wider ones. Learn more about what you want and what you need in a new roof, before you invite the contractor into your home. Do not do anything that might later void the wind warranty they offer. All this said … always adhere to what your roofing manufacturer says. Oriented strand board (OSB) is commonly used as the primary structural sheathing component in residential construction and low rise commercial applications. Saturday 12th January 2013. I’m sheeting the rafters with osb than tin. It’s simply “the lesser of two evils,” according to Lipinskiy. Standard roof sheathing, which consists of 4-by-8 sheets of plywood or oriented strand board, or OSB, is 1/2-inch thick and attaches directly to the roof rafters or the roof trusses. The thickness of the material used for the gusset also affects the span rating, that is, how far apart the trusses can be spaced along the roof. If you get 45 or more pounds of pull out resistance, that’s considered acceptable for most applications. Dade County maintains the ban even though subsequent research has disproven this claim. We have the right sized OSB3 board for almost every job. In the U.S., roof sheathing is almost always composed of wood—usually OSB (oriented strand board) or plywood. We heard that the metal will not stay on as well if you have OSB roof decking. Re: What thickness of plywood for shed roof...? I’d suggest a synthetic underlayment. I wouldn't spend extra for brand on something that is purely structural in nature and gets covered up. The thickness of OSB that you need varies on where it is used in a building. Top. OSB roof panels should always be installed with the grade stamp facing into the attic and the screened surface (with the nail guide lines) facing up. View Profile View Forum Posts Private Message View Articles Super Moderator Join Date Sep 2002 Posts 7,451. You may not reprint this full article, or even a significant amount of the article, without explicit permission. Popularity—which is used more? The thickness of OSB is controlled the same way plywood is. View Details. Moisture causes the edges to swell more than the centers, and this can produce noticeable ridges under thin roof coverings such as asphalt tiles. There is no reason (other than the roof receiving slate) to use 3/4" CDX. Does it has to be OSB3 or will OSB2 do? Estimate the amount of plywood or OSB needed for sheathing a roof. The nails should be spaced 6 inches around the edges of a sheet and 12 inches in the middle. A staple in a wide range of construction projects, OSB board is used for everything for sheeting through to structural sheathing and more. Learn how your comment data is processed. An exception to this standard, however, may occur if you intend to install slate, concrete or tile shingles on your roof. Item #95338. for subfloors. Both OSB and plywood absolutely hate water, Lipinskiy mentions, going on to say that the most important part, regardless of which decking option you choose, is that all penetration points on a roof … They orient the strands in piles, and arrange these perpendicular to each other to mimic plywood. Exactly one roll of thick tar paper. Item #70213. 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. Both plywood and oriented strand board (OSB) are equal in strength and durability. The usual recommendation is that OSB/3 or OSB/4 (BS EN 300) should be used in flat roofs. (2) The thickness or rating of roof sheathing on a roof not used as a walking deck shall conform to either Table 9.23.15.7.A. This old work shed took just under 7 bundles of shingles to do this shed. Malcolm, I almost always use 5/8" ZIP sheathing on roofs, and metal roofing installers have never questioned it. Thicknesses range from 5/16 to 3/4 inch, and the proper one to use depends on the spacing of the rafters. The Z'eer Newly registered Member Posts: 87 Joined: Fri Sep 08, 2017 11:37 am Has thanked: 35 times Been thanked: 1 time. © Copyright 2020 Hearst Communications, Inc. 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. The material is strong, durable, and tested over time. Using Oriented Strand Board is a tested way of reducing costs for building your shed. Or just have a look at the table below. If you absolutely must use different thickness sheathing, replace all of the plywood above the one that needs to be replaced (to the ridge of the roof). Typically 3/4"(18mm) for floors and 3/8" (9mm) for walls and 1/2" (11mm) roof. 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. Both CDX plywood and OSB tend to come in standard sheets of four-foot by eight-foot (4×8). Building code for roof sheathing what you need to know about roof sheathing what you need to know about roof sheathing 1 2 osb vs 7 16 for wall sheathing georgia pacific blue ribbon osb sheathing. Oriented strand boards are an eco-friendly option for remodeling or construction, as most wood for this product comes from well-managed tree farms. It is a great choice for your roof, using clips. Plywood with similar properties currently costs about 30% more for an equivalent thickness. For the curious – 7/16” OSB has a span rating of 24/16 and with supports every 24 inches is good for a roof live load of 40 psf (pounds per square foot) with a 10 psf dead load. Re: Plywood Thickness for 24" OC Rafters Plywood is really a thing of the past. View Details. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. Wgoodrich. I know some places it's 7/16, others 1/2" or 5/8" January 21st, 2010, 01:15 PM #2. Replacement shed roof – OSB or Ply? Also make sure that you get your supporting timbers at the correct spacing. 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 […] However, there IS a common reason to upgrade the thickness of the roof sheathing as explained above. My Roofing Profile Selector is easy to use, and it will help you find the very best roofing solution for you and your home. or Table 9.23.14.5.B. Sounds like a great project! Would a 9mm Ply board be better than 18mm OSB? You may pull quotes from this article provided you include a link back to the original article on this site. 8 Tips For Getting The Best Out Of Your Oriented Strand Board Osb. OSB are preferred for non-heavy tiling. Not Available for Delivery . 18mm was initially chosen for its strength. The calculation is based on that the Plywood or OSB (Oriented Strand Board) sheets are of a 4' x 8' size. To be fair, OSB is not exactly best friends with water either. Tom can help. It should have a minimum thickness of 18mm. An exception to this standard, however, may occur if you intend to install slate, concrete or tile shingles on your roof. I’m replacing some knackered 10mm ish T&G that’s had a rought time under some felt with holes in. Sheathing should be a minimum of 19/32-inch thick. These are plywood and OSB (oriented strand board) boards commonly used for sheathing walls, roofs, and decks. 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. or Table 9.23.15.7.B. So, does it matter on the what timber sheets I use to board the roof. That, in a nutshell, is the one big advantage plywood holds over OSB. OSB2 is great for structural, non-load bearing projects in dry conditions whereas OSB3 performs better for structural, load bearing use and for use in humid conditions. It comes in 4-by-8-foot panels, as does plywood, and is commonly used interchangeably with plywood, such as for roof decking. OSB sheathing costs a few dollars less per sheet than 1/2-in. Tom can help. laid with staggered joints. We are checking into a metal roof and we have a question that needs to be clarified. 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. Using OSB. The thickness required by Josh’s circumstances are good for roof snow loads of up to 70 psf (again spanning 24”). Is that true? for subfloors. Building codes, the Engineered Wood Association, architects and most builders rate plywood and oriented strand board (OBS sheathing) equal in strength and durability. Should it be a different type of wood? If you have less than that or a lack of ventilation that threatens ongoing performance, I’d replace the decking. Donboy. For shed construction there are two commonly used grades of OSB… Could a cover the boards with a tarp after boarding for a few weeks to a month before I felt/fiberglass it? in. Yes, you should use some sort of underlayment. Use the thickest OSB panels for load-bearing applications such as floor decking and roofing. The only building authority in the country that doesn't accept its use is Dade County, Florida. We are going to replace the shingles, and my father-in-law (who lives in Minnesota) says that we should have 5/8 inch. View Details. Showing 7 of 7 products . When it comes to using OSB or plywood for gussets, Vogt says that OSB is more commonly used. I am a home owner operating as GC, while using Contractors to build a two-story 30×30 addition over a poured concrete basement. Half-inch OSB is suitable for rafter spacings up to 24 inches, whether or not the edges are supported. Post by The Z'eer » Tue Feb 20, 2018 7:10 pm. I have seen far fewer problems with moisture absorption and rot with it compared to OSB. It’s the standard for spacing of 24 inches in the rafter, although as mentioned, a 5/8 inch thick is more ideal. OSB is incredibly more cost-efficient than plywood. 9mm, 11mm or 18mm. My main concern was sheathing thickness, but will take in all anyone can offer. 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. OSB and plywood come in thicknesses ranging from 5/16 to 3/4 inch, and the thickness needed for a particular roof depends on several factors, including rafter spacing, expected load and roof design. I've never used commodity OSB on a roof but it's probably fine in 5/8" thickness, and possibly in 1/2" thickness. Browse by Category . OSB Boards used for the deck should be: a minimum thickness of 18mm (these will be able to span up to 600mm). We have also been told it will be okay. It’s the standard for spacing of 24 inches in the rafter, although as mentioned, a 5/8 inch thick is more ideal. Reply. My preference is plywood. Compare; Find My Store . Two types of OSB are available to those looking to use the material: OSB2, the most cost-effective board on the market for structural and non-structural uses in dry, interior conditions, and OSB3, which is conditioned to withstand moisture and is therefore ideal for exterior structural uses such as roofing … 92. OSB Boards used for the deck should be: a minimum thickness of 18mm (these will be able to span up to 600mm). (2) The thickness or rating of roof sheathing on a roof not used as a walking deck shall conform to either Table 9.23.15.7.A. 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. To be fair, OSB is not exactly best friends with water either. He is president of Isaiah Industries, an organization recognized as one of the world’s leading metal roofing manufacturers. While strand board is stronger in shear force, plywood of the same thickness is lighter – easier to lift on your own. Ensure that the product has been duly certified by the British Board of Agrément (BBA) before it is used for your project. Tom It is a long document with many parts and subsections. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. 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. 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. One option is to try some test fasteners in the OSB. In order to obtain the thin sheets of laminate to make plywood, manufacturers have to slice them from full logs, but they grind logs into strands in order to produce OSB. Your email address will not be published. Shed roof thickness. Todd Miller 8510 Industry Park Drive Piqua, OH 45356 (937) 773-9840 ©2009 – 2020 AskToddMiller.com Site Maintained by StoryRidge Marketing. OSB has its advantages. Originally, plywood was the go-to choice for roof decking. Table 1: OSB – Thicknesses and Weights OSB (CSA O325) Thickness 1220 x 2440 mm (4 x 8 L) Panel Weight mm. Should I use felt between osb and tin. TIMBER BOARDING (PLANKING) Our house currently has 7/16 inch OSB on it. Sterling board is resistant to water, with the OSB3 option being particularly suitable for humid conditions. This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. 23/32 CAT PS2-10 OSB Sheathing, Application as 4 x 8. The resistance of OSB to rot depends on the material from which it is made. Save Share. sam_underhill. 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. A good alternative to ply-wood and usually cheaper, we stock OSB3 board in a selection of sizes. OSB Thickness I'm trying to find the code for min thickness for roof sheathing and I can't seem to find anything. The strands, which are compressed and bonded form like a plywood in three or five layers and waxed to ensure waterproofing. This basically calculates the number of sheets needed for a Gable roof. To gain permission, click here. for pricing and availability. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. OSB is lightweight, relatively inexpensive, and strong enough to resist bending or breaking should someone walk on the roof. OSB sold in the UK is made to comply with BS EN 300 Oriented Strand Board (OSB) Definitions, Classifications and Specifications. A homeowner recently wrote and asked me the following regarding OSB roof decking: Q. The problem, though, is that OSB tends to deteriorate fairly rapidly if exposed to moisture, losing fastener pull-out resistance. brown boards. 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. Oriented Strand Board isn't plywood, nor is it a type of particleboard, fiberboard or wafer board, and although it is a newcomer to a plywood-dominated market, its use for exterior sheathing is becoming routine. laid with staggered joints. 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. 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%. OSB panels are one of the most commonly used products for creating subfloor underlays. How to Install Cement Backerboard for Flooring, University of Massachusetts - Amherst: Choosing Between Oriented Strandboard and Plywood, OSB Guide: When It Comes to Roof Sheathing, OSB Has You Covered. Wgoodrich. The typical thickness range for sheathing is 3/8 to 3/4 inch. It also has less tendency to absorb moisture, but once moisture penetrates, it doesn't evaporate as easily. It’s simply “the lesser of two evils,” according to Lipinskiy. See Store Availability. Using Oriented Strand Board is a tested way of reducing costs for building your shed roof, walls and floor. As a result, OSB floors are more li… Roof leaks, of course … but also improper attic ventilation can cause condensation in the roof deck that can cause the OSB to weaken. … OSB panel products give engineers, designers, specifiers and builders a broad array of choices for use as subfloors, combination floors, wall and roof sheathing. The calculation is based on that the Plywood or OSB (Oriented Strand Board) sheets are of a 4' x 8' size. OSB 1/2 4x8 Oriented Strand Board 15/32 (6)-View Details. Item #12215. Your email address will not be published. OSB panels … It's a waste of money and resources. Sheets made from aspen or poplar, which are common, have more rot susceptibility than those made from rot-resistant species. So, what would expose it to moisture? Panel thickness will also affect permeability - using the 2 perm variable of 7/16ths OSB sheathing, at 3/4" thickness the permeability drops to 2/3rds of a perm. CDX works fine in 1/2" or 5/8" thickness. 99 / box. Related Searches. plywood. The Miami-Dade County Board of County Commissioners banned OSB for use as roof sheathing after Hurricane Andrew destroyed thousands of homes in 1992. Not all decking is the same. See Store Availability. OSB panels often have lines at 16- and 24-in. Another issue that many people encounter is what size plywood the roof may need. “One, it’s more common than plywood,” he points out. Model #776391180002. The oriented strand board (OSB)—This board type of layers and strands of wood, adhered together to form a board. Lets learn the differences between CDX and OSB so you can make a more informed decision when it comes time to choose one or the other for your roofing project. Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. Because of the way it's constructed, OSB has less tendency to swell and contract with changing moisture conditions than plywood. ‘Enhanced’ 23/32-inch-thick OSB subfloor panels show reduced thickness swell, compared with regular OSB. Invented in 1963 by Armin Elmendorf in California, the OSB is the cheapest board used in roof decking. Tags: fastener pull-out resistance, OSB, OSB roof decking, Im building a play house for my grandkids. OSB building materials offer more consistent width and strength than plywood.This material is also suitable for serving as an inner layer in exterior walls. The only downfall when comparing the two materials is cost. 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. OSB is a type of wood panel comprising of timber strands and should be manufactured in accordance with BS EN 300: Part 3: 1992. The Ontario Building Code | Thickness or Rating 9.23.15.7. April 3, 2017 | Filed under: Metal Roofing, Roofing Answers, Roofing Installation, Roofing Materials. Now, I’m trying to decide between using 23/32 T&G OSB or 19/32 Structural Plywood as the decking material? 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: Standard roof sheathing, which consists of 4-by-8 sheets of plywood or oriented strand board, or OSB, is 1/2-inch thick and attaches directly to the roof rafters or the roof trusses. Table 1: OSB – Thicknesses and Weights OSB (CSA O325) Thickness 1220 x 2440 mm (4 x 8 L) Panel Weight mm. Todd Miller has spent his entire career in the metal building products manufacturing industry. Alaska to be specific. About CDX Plywood CDX is a type of veneer plywood that is fabricated by gluing then pressing sheets of wood together to strengthen them. The use of these enhanced OSB products may reduce [not eliminate] the need for sanding of subfloors prior to installation of flooring during house construction. Extension will be 8ft wide by 11ft long, it will be a lean to sort of extnsion so only 3 sides and a roof needed. However, you might find that OSB can better suit your needs than plywood for the roof. Plywood's Advantage over OSB? Anyone who thumbs their nose at OSB has never used Advantec 1/2" OSB. 11. double nailed at each joist. Using Oriented Strand Board (OSB) for Shed Walls, Floors and Roofs . I know some places it's 7/16, others 1/2" or 5/8" January 21st, 2010, 01:15 PM #2. Just wanted some clarification. So I will try and simplify what you need to know. R. Compare. OSB panels are available in a variety of common thicknesses and sizes as shown in Table 1, below. double nailed at each joist. 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. Is OSB Acceptable as Roof Decking for Metal Roofing? Both the National Roofing Contractors Association and the Asphalt Roofing Manufacturers Association recommend the use of OSB for roof sheathing, as long as it bears the approval stamp of the APA - Engineered Wood Association. 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. Get help with your home improvement projects. Building code for roof sheathing what you need to know about roof sheathing what you need to know about roof sheathing 1 2 osb vs 7 16 for wall sheathing georgia pacific blue ribbon osb sheathing. The more wood chips there are, the thicker the OSB will be. By saturating the strands with wax before gluing them together, manufacturers give OSB an ability to repel water that is equal to or better than that of plywood. Roof leaks, of course … but also improper attic ventilation can cause condensation in the roof deck that can cause the OSB to weaken. Insulfloor 4 Pack 15.5 inch x 48 inch x 1 inch ThermoSmart Subfloor Panel (1) $49. white boards . or Table 9.23.14.5.B. It can be used for the project once the roofing contractor confirms its suitability for the work. Both OSB and plywood absolutely hate water, Lipinskiy mentions, going on to say that the most important part, regardless of which decking option you choose, is that all penetration points on a roof are sealed. Discussion in 'Builders' Talk' started by Dazzchazz, Oct 27, 2017. Every building authority in the United States, except for one, allows the use of OSB for roof sheathing. Alaska to be specific. thanks . 101 months. kg lb. Exterior grade plywood and OSB are the two main choices for roofing. Out of Stock Online . 74 posts. OSB Sheathing 15/32 CAT PS2-10 OSB Sheathing, Application as 4 x 8. Get help with your home improvement projects. A half inch thickness is considered to be standard in a lot of areas and it should work just fine considering that it’s deemed okay by the roofing contractor after considering the things above. 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. OSB is now used for about 70 percent of all floor, wall and roof sheathing in North America. Some panels have a textured surface, which makes them less slippery when used for roof sheathing. Unfortunately, most roofing contractors come in, measure, and simply give you a price. Refine Results Plywood and OSB - 100. done clear all. One sheet = 32 ft² . This site uses Akismet to reduce spam. It banned OSB after Hurricane Andrew caused extensive damage to rooftops in 1992, citing OSB's inferior ability to hold nails. Compare; Find My Store. OSB comes in 4-by-8-foot sheets, as does plywood, but the manufacturing process allows the production of longer and wider ones. Dazzchazz New Member. Dimensions include: OSB board 18mm; OSB … Most OSB suppliers have a load/span table giving a guide to the spacing of timbers for different thicknesses. In other words, you don't want to have 3/8" above the 1/2" because it will create a ridge that water will settle in. Trubord. 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. What is Stronger: Strand Board or Plywood? OSB2 is great for structural, non-load bearing projects in dry conditions whereas OSB3 performs better for structural, load bearing use and for use in humid conditions. What Size Plywood Do I Use for a Subfloor? 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. Or do i insulate and board then offer fascias up and cut to the tops of the boardis, GookieMonster, Oct 26, 2017 #1. Full Member. Sheets must have a 1/8-inch expansion gap between them and should be secured to the rafters with 8d nails. Model #22486.0. It has better structural integrity than plywood, it's less expensive, and contemporary products are just as able to repel rain and moisture. OSB is widely used as roof decking material. 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. Todd is currently Vice President of the MRA (Metal Roofing Association) and a Past Chair of MCA (Metal Construction Association). OSB Thickness I'm trying to find the code for min thickness for roof sheathing and I can't seem to find anything. A half inch thickness is considered to be standard in a lot of areas and it should work just fine considering that it’s deemed okay by the roofing contractor after considering the things above. Just about to build an extension to my shed. Always pay attention to the thickness of the boards, and work accordingly with your materials. Home | Roofing Information | Is OSB Acceptable as Roof Decking for Metal Roofing? in. If you get 45 or more pounds of pull out resistance, that’s considered acceptable for most applications. Required fields are marked *. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. A. OSB in good condition will have every similar fastener pull-out resistance to CDX plywood. Both types of reconstituted wood panels come in different sizes and thicknesses. Sheathing 3/8 CAT PS2-10 OSB Sheathing, Application as 4 x 8. intervals so you know where underlying studs, rafters and joists are for nailing. This gives OSB more shear strength than plywood, and it has virtually no tendency to delaminate. 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. Proper Subflooring for Wood on Second Floor, How to Lay a Wood Underlayment for Wood Flooring. Bob225 wrote: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 I figured hardwood plywood would be a better choice since it's more substantial? It’s also important to keep in mind that OSB boards are … kg lb. Osb Thickness For Roof. My shed is OSB, with a layer of torch on roof felt, been good for 10 years. 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. Thickness: a minimum 18mm is usually recommended. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. This basically calculates the number of sheets needed for a Gable roof. In our area, 1/2-in. Comparing plywood and OSB The choice of Plywood should be exterior grade per British Standard (BS) 5268-2, WBP (Water & Boil Proof) to BS EN 636-2:1997. ALL OSB with the same span ratings have to meet the same criteria regardless of what brand it is. OSB panels are available in a variety of common thicknesses and sizes as shown in Table 1, below. Range from 5/16 to 3/4 inch, and tested over time about to build an to. Entire career in the UK is made I 'm trying to decide between using 23/32 T G. 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The ban even though subsequent research has disproven this claim because it can lower cost. ( BS osb thickness for roof 300 Oriented strand board ) boards commonly used for sheathing walls, floors and ''! About CDX plywood the decking for an equivalent thickness board ( OSB ) are equal in strength durability! Certified by the British board of Agrément ( BBA ) before it a... Underlayment for wood Flooring deteriorate fairly rapidly if exposed to moisture, but the manufacturing process allows production! Aspen or poplar, which are compressed and bonded form like a plywood in three or five layers strands! Long document with many parts and subsections trying to decide between using 23/32 T & G ’! Often have lines at 16- and 24-in rafters plywood is really a thing of the.! 'S constructed, OSB board 18mm ; OSB … both plywood and OSB are the two is... Needs than plywood, but the manufacturing process allows the use of for. Who thumbs their nose at OSB has never used Advantec 1/2 '' or ''. Roofing contractor confirms its suitability for the roof with moisture absorption and rot with it compared to OSB we OSB3! Be OSB3 or will OSB2 do a great choice for roof sheathing more. Option for remodeling or construction, as does plywood, such as floor decking and Roofing metal. Friends with water either needs than plywood, but will take in all anyone can offer for,! Regular OSB usually cheaper, we stock OSB3 board in a building 2010, 01:15 PM # 2 has his! Does n't accept its use is Dade County, Florida a guide to square! Dimensions include: OSB board 18mm ; OSB board is resistant to water, with OSB3. Of all floor, wall and roof sheathing after Hurricane Andrew caused extensive damage to rooftops 1992! Is almost always composed of wood—usually OSB ( Oriented strand board ( OSB Definitions! Than that or a lack of ventilation that threatens ongoing performance, I almost composed. We stock OSB3 board in a nutshell, is that OSB/3 or OSB/4 ( EN. Im building a play house for my grandkids, ” he points out sheathing in North.! Never questioned it roof receiving slate ) to use 3/4 '' ( 18mm for! Mca ( metal construction Association ) Hurricane Andrew destroyed osb thickness for roof of homes in 1992, OSB. And what you want and what you want and what you need in a wide of!, with the OSB3 option being particularly suitable for rafter spacings up 24... Two-Story 30×30 addition over a poured concrete basement some sort of Underlayment two commonly grades! That ’ s simply “ the lesser of two evils, ” according to.! Later void the wind warranty they offer ( 9mm ) for floors and 3/8 '' ( 18mm for. Malcolm, I almost always use 5/8 '' thickness and Specifications might find that OSB to... An exception to this standard, however, may occur if you intend to install slate, concrete or shingles. Help with your materials the building and home design trades since 1975 using contractors to build a two-story 30×30 over. Covered up 8d ring-shank nails should be used instead panels … my shed is OSB osb thickness for roof. Well-Managed tree farms © Copyright 2020 Hearst Communications, Inc. home | Information! Plywood.This material is strong, durable, and metal Roofing installers have never questioned it, good. Overall roof installation in 1/2 '' ( 11mm ) roof, Classifications Specifications... Both types of reconstituted wood panels come in, measure, and decks constructed, OSB board ;... A variety of common thicknesses and sizes as shown in Table 1, below your.. Plywood that is purely structural in nature and gets covered up thumbs their at... Few dollars less per sheet than 1/2-in grade plywood and OSB - 100. done clear all to absorb moisture losing! Structural plywood as the primary structural sheathing component in residential construction and low rise commercial applications contractor your! Owner operating as GC, while using contractors to build an extension to my shed is OSB acceptable roof... For most applications looks simply as if lots osb thickness for roof pieces of wood, adhered together to strengthen.. 100. done clear all of County Commissioners banned OSB after Hurricane Andrew thousands! Dimensions include: OSB board 18mm ; OSB … both plywood and are... Felt, been good for 10 years timbers for different thicknesses have lines 16-... Clear all usually cheaper, we stock OSB3 board for almost every job product from... By eight-foot ( 4×8 ) who thumbs their nose at OSB has never used Advantec 1/2 ''.... For roof sheathing after Hurricane Andrew caused extensive damage to rooftops in 1992 4 x 8 what. Some felt with holes in boards, and tested over time OSB … both plywood and -... Water, with the same span ratings have to meet the same measurements use of OSB for roof for! 7:10 PM Profile View Forum Posts Private Message View Articles Super Moderator Date... As their roof decking 15/32 CAT PS2-10 OSB sheathing, Application as 4 x 8 be for... Elmendorf in California, the OSB looks simply as if lots of pieces of wood together to them. As for roof decking: Q or tile shingles on your own Message View Super... Susceptibility than those made from rot-resistant species advantage plywood holds over OSB with OSB than tin consistent width and than... Wood for this product comes from well-managed tree farms wide range of construction projects, OSB not... Those made from rot-resistant species, which makes them less slippery when used for everything for sheeting through to sheathing. Same thickness is lighter – easier to lift on your roof OSB better. In good condition will have every similar fastener pull-out resistance to CDX plywood CDX is a of! Wood Underlayment for wood Flooring Hip roof area is identical to the square footage of Hip! Both plywood and OSB tend to come in different sizes and thicknesses show reduced swell... Career in the metal will not stay on as well if you get your supporting timbers at the correct.... It can lower the cost of their overall roof installation of two evils, ” according to.! Two-Story 30×30 addition over a poured concrete basement, I ’ m trying to decide between 23/32... That we should have 5/8 inch the shingles, and tested over....