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for subfloors. OSB sold in the UK is made to comply with BS EN 300 Oriented Strand Board (OSB) Definitions, Classifications and Specifications. The thickness of OSB is controlled the same way plywood is. 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. Should I use felt between osb and tin. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. Fortunately, this is one issue that has primarily been standardized by the industry. It also has less tendency to absorb moisture, but once moisture penetrates, it doesn't evaporate as easily. The strands, which are compressed and bonded form like a plywood in three or five layers and waxed to ensure waterproofing. kg lb. The material is strong, durable, and tested over time. OSB panels … Model #22486.0. I have seen far fewer problems with moisture absorption and rot with it compared to OSB. Dade County maintains the ban even though subsequent research has disproven this claim. 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. Compare. What Size Plywood Do I Use for a Subfloor? Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. 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. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. We are going to replace the shingles, and my father-in-law (who lives in Minnesota) says that we should have 5/8 inch. My preference is plywood. One sheet = 32 ft² . OSB Sheathing 15/32 CAT PS2-10 OSB Sheathing, Application as 4 x 8. or Table 18.104.22.168.B. 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? Browse by Category . Re: What thickness of plywood for shed roof...? Table 1: OSB – Thicknesses and Weights OSB (CSA O325) Thickness 1220 x 2440 mm (4 x 8 L) Panel Weight mm. Both plywood and oriented strand board (OSB) are equal in strength and durability. 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. in. for pricing and availability. I've never used commodity OSB on a roof but it's probably fine in 5/8" thickness, and possibly in 1/2" thickness. A homeowner recently wrote and asked me the following regarding OSB roof decking: Q. The only downfall when comparing the two materials is cost. Wgoodrich. Not all decking is the same. Todd is currently Vice President of the MRA (Metal Roofing Association) and a Past Chair of MCA (Metal Construction Association). There is no reason (other than the roof receiving slate) to use 3/4" CDX. I know some places it's 7/16, others 1/2" or 5/8" January 21st, 2010, 01:15 PM #2. Required fields are marked *. Osb Thickness For Roof. Donboy. for subfloors. Dimensions include: OSB board 18mm; OSB … Exterior grade plywood and OSB are the two main choices for roofing. This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. 11. Oriented strand board (OSB) is commonly used as the primary structural sheathing component in residential construction and low rise commercial applications. OSB panels are one of the most commonly used products for creating subfloor underlays. Does it has to be OSB3 or will OSB2 do? 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. Full Member. He is president of Isaiah Industries, an organization recognized as one of the world’s leading metal roofing manufacturers. Comparing plywood and OSB 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. 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. Save Share. An exception to this standard, however, may occur if you intend to install slate, concrete or tile shingles on your roof. Most OSB suppliers have a load/span table giving a guide to the spacing of timbers for different thicknesses. Out of Stock Online . Refine Results Plywood and OSB - 100. done clear all. It has better structural integrity than plywood, it's less expensive, and contemporary products are just as able to repel rain and moisture. laid with staggered joints. sam_underhill. Trubord. They orient the strands in piles, and arrange these perpendicular to each other to mimic plywood. Using Oriented Strand Board is a tested way of reducing costs for building your shed roof, walls and floor. I know some places it's 7/16, others 1/2" or 5/8" January 21st, 2010, 01:15 PM #2. View Profile View Forum Posts Private Message View Articles Super Moderator Join Date Sep 2002 Posts 7,451. 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). Sheets must have a 1/8-inch expansion gap between them and should be secured to the rafters with 8d nails. The resistance of OSB to rot depends on the material from which it is made. It’s simply “the lesser of two evils,” according to Lipinskiy. Both types of reconstituted wood panels come in different sizes and thicknesses. A good alternative to ply-wood and usually cheaper, we stock OSB3 board in a selection of sizes. 92. You may pull quotes from this article provided you include a link back to the original article on this site. Using Oriented Strand Board is a tested way of reducing costs for building your shed. Item #70213. It is a great choice for your roof, using clips. 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. 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. 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: This gives OSB more shear strength than plywood, and it has virtually no tendency to delaminate. Sheathing 3/8 CAT PS2-10 OSB Sheathing, Application as 4 x 8. 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. Sterling board is resistant to water, with the OSB3 option being particularly suitable for humid conditions. Learn more about what you want and what you need in a new roof, before you invite the contractor into your home. Oriented strand boards are an eco-friendly option for remodeling or construction, as most wood for this product comes from well-managed tree farms. This basically calculates the number of sheets needed for a Gable roof. OSB is lightweight, relatively inexpensive, and strong enough to resist bending or breaking should someone walk on the roof. The nails should be spaced 6 inches around the edges of a sheet and 12 inches in the middle. Dazzchazz New Member. 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 … However, there IS a common reason to upgrade the thickness of the roof sheathing as explained above. Shed roof thickness. Your email address will not be published. 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. The problem, though, is that OSB tends to deteriorate fairly rapidly if exposed to moisture, losing fastener pull-out resistance. The usual recommendation is that OSB/3 or OSB/4 (BS EN 300) should be used in flat roofs. thanks . Malcolm, I almost always use 5/8" ZIP sheathing on roofs, and metal roofing installers have never questioned it. Your email address will not be published. Top. 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. double nailed at each joist. Discussion in 'Builders' Talk' started by Dazzchazz, Oct 27, 2017. It is a long document with many parts and subsections. Replacement shed roof – OSB or Ply? 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. We are checking into a metal roof and we have a question that needs to be clarified. Now, I’m trying to decide between using 23/32 T&G OSB or 19/32 Structural Plywood as the decking material? or Table 22.214.171.124.B. All this said … always adhere to what your roofing manufacturer says. 74 posts. This site uses Akismet to reduce spam. Is that true? (2) The thickness or rating of roof sheathing on a roof not used as a walking deck shall conform to either Table 126.96.36.199.A. 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. Using Oriented Strand Board (OSB) for Shed Walls, Floors and Roofs . R. In our area, 1/2-in. If interested, email me at email@example.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. Just wanted some clarification. OSB 1/2 4x8 Oriented Strand Board 15/32 (6)-View Details. intervals so you know where underlying studs, rafters and joists are for nailing. OSB is incredibly more cost-efficient than plywood. OSB is widely used as roof decking material. Table 1: OSB – Thicknesses and Weights OSB (CSA O325) Thickness 1220 x 2440 mm (4 x 8 L) Panel Weight mm. The thickness required by Josh’s circumstances are good for roof snow loads of up to 70 psf (again spanning 24”). I’d suggest a synthetic underlayment. Originally, plywood was the go-to choice for roof decking. 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. 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