Dazzchazz New Member. 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. Item #12215. Todd is currently Vice President of the MRA (Metal Roofing Association) and a Past Chair of MCA (Metal Construction Association). OSB 1/2 4x8 Oriented Strand Board 15/32 (6)-View Details. View Profile View Forum Posts Private Message View Articles Super Moderator Join Date Sep 2002 Posts 7,451. Not Available for Delivery . Could a cover the boards with a tarp after boarding for a few weeks to a month before I felt/fiberglass it? OSB Sheathing 15/32 CAT PS2-10 OSB Sheathing, Application as 4 x 8. Some panels have a textured surface, which makes them less slippery when used for roof sheathing. 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? One sheet = 32 ft². 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. … 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. OSB Boards used for the deck should be: a minimum thickness of 18mm (these will be able to span up to 600mm). Popularity—which is used more? Item #70213. for subfloors. for subfloors. Now, I’m trying to decide between using 23/32 T&G OSB or 19/32 Structural Plywood as the decking material? We heard that the metal will not stay on as well if you have OSB roof decking. 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. Every building authority in the United States, except for one, allows the use of OSB for roof sheathing. Osb Thickness For Roof. Compare; Find My Store . All this said … always adhere to what your roofing manufacturer says. 18mm was initially chosen for its strength. 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. Originally, plywood was the go-to choice for roof decking. Dade County maintains the ban even though subsequent research has disproven this claim. Customers are choosing OSB to be installed as their roof decking because it can lower the cost of their overall roof installation. Sheets made from aspen or poplar, which are common, have more rot susceptibility than those made from rot-resistant species. Shed roof thickness. Model #22486.0. My Roofing Profile Selector is easy to use, and it will help you find the very best roofing solution for you and your home. 9mm, 11mm or 18mm. We are going to replace the shingles, and my father-in-law (who lives in Minnesota) says that we should have 5/8 inch. Tags: fastener pull-out resistance, OSB, OSB roof decking, Im building a play house for my grandkids. A staple in a wide range of construction projects, OSB board is used for everything for sheeting through to structural sheathing and more. TIMBER BOARDING (PLANKING) I know some places it's 7/16, others 1/2" or 5/8" January 21st, 2010, 01:15 PM #2. 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. 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. OSB sold in the UK is made to comply with BS EN 300 Oriented Strand Board (OSB) Definitions, Classifications and Specifications. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. The thickness required by Josh’s circumstances are good for roof snow loads of up to 70 psf (again spanning 24”). or Table 9.23.14.5.B. 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. Roof leaks, of course … but also improper attic ventilation can cause condensation in the roof deck that can cause the OSB to weaken. Sheets must have a 1/8-inch expansion gap between them and should be secured to the rafters with 8d nails. It is a great choice for your roof, using clips. That, in a nutshell, is the one big advantage plywood holds over OSB. It’s the standard for spacing of 24 inches in the rafter, although as mentioned, a 5/8 inch thick is more ideal. I know some places it's 7/16, others 1/2" or 5/8" January 21st, 2010, 01:15 PM #2. A good alternative to ply-wood and usually cheaper, we stock OSB3 board in a selection of sizes. The problem, though, is that OSB tends to deteriorate fairly rapidly if exposed to moisture, losing fastener pull-out resistance. Wgoodrich. 8 Tips For Getting The Best Out Of Your Oriented Strand Board Osb. 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 widely used as roof decking material. OSB is incredibly more cost-efficient than plywood. It’s simply “the lesser of two evils,” according to Lipinskiy. 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. There is no reason (other than the roof receiving slate) to use 3/4" CDX. View Details. Does it has to be OSB3 or will OSB2 do? Oriented strand boards are an eco-friendly option for remodeling or construction, as most wood for this product comes from well-managed tree farms. for pricing and availability. 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. My preference is plywood. Most OSB suppliers have a load/span table giving a guide to the spacing of timbers for different thicknesses. OSB is now used for about 70 percent of all floor, wall and roof sheathing in North America. To be fair, OSB is not exactly best friends with water either. 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. Using Oriented Strand Board is a tested way of reducing costs for building your shed. Tom can help. 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 … Discussion in 'Builders' Talk' started by Dazzchazz, Oct 27, 2017. The more wood chips there are, the thicker the OSB will be. This basically calculates the number of sheets needed for a Gable roof. It comes in 4-by-8-foot panels, as does plywood, and is commonly used interchangeably with plywood, such as for roof decking. Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. double nailed at each joist. Both types of reconstituted wood panels come in different sizes and thicknesses. (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. An exception to this standard, however, may occur if you intend to install slate, concrete or tile shingles on your roof. OSB panels are one of the most commonly used products for creating subfloor underlays. As a result, OSB floors are more li… Trubord. 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. The Miami-Dade County Board of County Commissioners banned OSB for use as roof sheathing after Hurricane Andrew destroyed thousands of homes in 1992. plywood. View Details. View Details. Thicknesses range from 5/16 to 3/4 inch, and the proper one to use depends on the spacing of the rafters. Typically 3/4"(18mm) for floors and 3/8" (9mm) for walls and 1/2" (11mm) roof. Osb Thickness For Roof. 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%. Alaska to be specific. Dimensions include: OSB board 18mm; OSB board 11mm. The Ontario Building Code | Thickness or Rating 9.23.15.7. Dimensions include: OSB board 18mm; OSB … Sterling board is resistant to water, with the OSB3 option being particularly suitable for humid conditions. It’s the standard for spacing of 24 inches in the rafter, although as mentioned, a 5/8 inch thick is more ideal. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. Roof leaks, of course … but also improper attic ventilation can cause condensation in the roof deck that can cause the OSB to weaken. However, you might find that OSB can better suit your needs than plywood for the roof. Alaska to be specific. Learn how your comment data is processed. Required fields are marked *. grey boards. 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. Or OSB/4 ( BS EN 300 Oriented strand boards are an eco-friendly option for remodeling construction. To absorb moisture, losing fastener pull-out resistance, that ’ s considered acceptable for applications. G that ’ s leading metal Roofing manufacturers grid-marked 4-by-8-foot sheets, simply... Table 1, below back to the square footage of a Gable roof of the boards, and father-in-law... 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