It's quick, easy, low cost, and you can do it yourself. How to install osb roof deck sheathing. The Ten most Important Fasteners for Installing Roof Sheathing, West Fraser Completes Acquisition of Norbord. For shed construction there are two commonly used grades of OSB… For improved performance, consider thicker roof sheathing panels, panel edge clips, or panels with tongue-and-groove edges. Each day, our editors assemble the latest breaking industry OSB is made by combining glue, resin, and wood chips and pressing them into the shape of a plywood sheet then baking everything together. OSB comes in 4-by-8-foot sheets, as does plywood, but the manufacturing process allows the production of longer and wider ones. Sign up today! 4. OSB sheathing is a special type of board that is well-engineered being composed of strands of compressed wood which are layered and unionized together using a resin. Trusses or rafters should be shimmed as necessary to provide a level nailing surface. Use a 10d box (0.128-inch-by-3-inch) nail as a spacer to gauge 1/8-inch edge and end spacing between panels. 1 Answer. news, hottest trends, and most relevant research, delivered to 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. 2. Your privacy is important to us; your email will remain confidential and will not be shared with any other parties. We won't send you spam and only send at most two updates per month. Installation instructions. Subscribe for unlimited access. Start at the lowest edge of the roof and roll out the felt at right angles to the direction of the full. At intermediate supports, fasten panels 12 inches on center. Because of its construction, some manufacturers actually make larger sheets of OSB. Remove wrinkles and flatten the surface of the shingle underlayment before installing asphalt or fiberglass shingles. The calculation is based on that the Plywood or OSB (Oriented Strand Board) sheets are of a 4' x 8' size. Roof sheathing (or decking) is one of those elements. The minute any moisture gets in, its starts to break apart within 2-3 months. This will allow the silicone to squeeze out … They can range from the standard 4’ x 8’ piece to a 4’ x 9’ or even a 4’ x 10’ . Roof leaks, of course … but also improper attic ventilation can cause condensation in the roof deck that can cause the OSB to weaken. 1,500 ÷ 32 = 46.875 sheets. The first raw of fixings at eave is located at 2,5 cm from the edge of the roof support (OSB or purlin). View more helpful strategies, here. A roof system consists of several elements working together to protect the home. Avoid standing between framing, which can induce panel deflection. For example, if your roof is 1,500 ft 2 then it will take 47 sheets of plywood to sheath it. Also make sure that you get your supporting timbers at the correct spacing. Install baffles providing a minimum of 1 inch of clear space between framing and/or under roof decking at eaves to ensure that ceiling or roof insulation does not block ventilation paths. Install intermediate fasteners, starting at panel edge. Thicknesses range from 5/16 to … How to Install Corrugated Roofing. In this case, carrying a sheet or two up a ladder can be the easiest way to do it. A minimum net free ventilation area of 960 square inches for each 1,000 square feet (1/150th) of the ceiling area is required. Pro Builder is an advertisting supported site and we noticed you have ad-blocking enabled in your browser. For plywood, it is like $5 to $10 more expensive. Many times leak through the roofing will run downhill on the water barrier till it finds an opening in it (commonly at a roof penetration) then come through and rot the sheathing at that point. On panels with a screened surface or skid-resistant coating, install panels with the non-skid surface up. One 4-by-8-foot sheet of OSB or plywood is 32 square feet. APA - The Engineered Wood Association has introduced the seventh article in its Builder Tips series of publications: Plywood and OSB are ideal materials for roof sheathing systems ranging from simple single-family residences to large commercial buildings. 6. Note that these are minimum code requirements, which have been found to be adequate under most normal circumstances. Install fasteners at one panel end. Fasten panels in rows across the width, continuing this sequence along the length of the panel. OSB roof sheathing – about 60% cheaper than standard plywood.. These sheets of wood may look similar, but they are not created the same. If using asphalt or fiberglass shingles, postpone shingle installation as long as possible. For example, perhaps the majority of the roof is already sheathed and you simply need to get the last two pieces up that were not in your original material calculations. It is true as the price of every OSB board is around $15 – $20 per sheet (4×8 sizes). This how-to article is part of the Builder Tips series of publications from APA - The Engineered Wood Association. How it’s made—Plywood vs. OSB. Stand on the panel over the framing near the fastener location to ensure contact with framing while driving fasteners. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. Here are some things to consider when choosing your decking material to install on a roof. In the U.S., it is almost always composed of wood—usually OSB (oriented strand board) or plywood. To be fair, OSB is not exactly best friends with water either. This can be done with a straight piece of lumber (6 feet to 10 feet long) or a long carpenter’s level. Check building code requirements for installation of panel edge clips. And of course make sure he locates the leak source and fixes that too - might be on that sheet or might be adjacent or uphill, or commonly at a penetration through it or an unhill sheet. If the top chords of trusses or rafters are warped or bowed, install blocking to straighten. Fasteners should be driven flush with the panel surface. Avoid Butting OSB Panels Tightly. Avoid Putting OSB on Wet Roof Trusses. Get Pro Builder in your inbox. OSB is currently selling for less than plywood by approximately $3 per sheet, meaning a savings of several hundred dollars per conventional home. Once you have aligned it, measure and trim to the correct size with a sharp knife. For vaulted or cathedral roof construction, provide a free ventilation path from eaves to ridge between all rafters. The screened surface also provides a little more traction for construction workers during installation. Having said that, it is very important that the sheathing be installed with the strength axis perpendicular to the trusses/rafters. 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. From the 2012 IBC (International Building Code) Table 2304.6.1 – over framing spaced 24 inches on center, 7/16” OSB fastened with 8d common nails six inches on center at the edges and in the field will support a maximum design wind speed (Vult) of 110 mph (miles per hour) in Exposure B or 90 mph in Exposure C. Table 2304.7(3) gives the 7/16” OSB the ability to carry a roof live load of 40 psf (pounds per square foot) … It will be a good idea to get an extra few sheets of plywood when ordering to allow for waste and off-cuts. Some baked sourdough bread. 2. Which way should my OSB roof board’s be installed? Some people falsely conflate OSB with particle board. 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. The crew that you had to help install the rest of the sheets is gone, so now it’s up to you. West Fraser’s products are used in home construction, repair and remodeling, industrial applications, papers, tissue and box materials. Some people learned a new language during quarantine. 3. Because of this manufacturing process, OSB is at least half the cost of CDX plywood. There are two ways you can keep reading: Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. • Start laying sheets over the gutter with 6 cm overhang (maximum). The strength axis is usually the long direction of the panel but the grade stamp will indicate it. Use a chalk line or straight edge to align fasteners on framing. Sagging may result if panels are installed incorrectly. Get all the latest news and industry tips straight from Norbord delivered to your email. Position panel. A 1/8-inch space between adjacent panel end and edge joints is recommended, unless the panel manufacturer indicates otherwise. OSB sold in the UK is made to comply with BS EN 300 Oriented Strand Board (OSB) Definitions, Classifications and Specifications. A gabled roof is one of the easiest types of roofs to build and cover, but sometimes these structures contain a two- or three-story expanse of solid wall underneath each gable. So I will try and simplify what you need to know. 7. Do this until the entire roof is covered. / Posted in: The Ol' Sage Builder. It can handle a surprising amount of rain before swelling and breaking down. Lorem ipsum dolor sit amet lorem ipsum dolor sit amet lorem ipsum dolor sit amet. The same goes for wall sheathing and flooring panels; always install with the grade stamp up so that inspectors can do their jobs easily. It is a long document with many parts and subsections. Remove temporary fasteners at corners. your inbox. (and scroll down to see more details on each, with installation hints and tips, below), Step 1: Check the nailing surface is level, Step 2: Ventilate the roof according to current building codes, Step 3: Properly fasten panels (including fastening and spacing hints), Step 4: Cover sheathing with shingle underlayment felt, Step 5: Install shingles according to manufacturer recommendations. Fasteners should be 3/8 inch from panel ends and 3/8 inch from panel edges (see hints below). Avoid Nailing or Stapling Edges of OSB Panels Use temporary fasteners at corners if needed to square panel on framing. Leave a 3 mm (1/8 inch) gap between the OSB panels to allow for expansion. While its allowed by code, we strongly advise against using OSB for sheathing. By creating an account, you agree to Pro Builder's terms of service and privacy policy. Be very careful on hip roofs along the hip to make sure the strength axis does not mistakenly get parallel to the supports as that may result in the panel exceeding the maximum span allowed for that thickness. It differs from commonly used plywood in many aspects. • Lay sheets in the opposite direction to the prevailing winds. In high-wind areas, more fasteners may be required. With all the available technology out there for builders, why isn’t it easier and faster to build?…, Online sales growth for the past five years signals buyer preferences were already changing, but…, © COPYRIGHT 2021 PROFESSIONAL BUILDER. Each day, Pro Builder's editors assemble the latest breaking industry news, hottest trends, and most relevant research, delivered to your inbox. It’s simply “the lesser of two evils,” according to Lipinskiy. For example, it does not have voids or knots, or gaps and laps. This basically calculates the number of sheets needed for a Gable roof. Vent exhaust air from kitchens, baths, and laundry to the outdoors with vent pipes that run through the roof cavity or attic to roof ventilators. With this thickness any deflection under dead loads only (the weight of materials only) should prove to be imperceptible. The number of nails needed for a roof varies on multiple factors, such as board face width, length and roof truss spacing. This will give you the total number of sheets to buy. Spacer-type panel edge clips are available from some manufacturers. Stagger the panels over the roof with 2 supports between panel ends. Plywood and OSB are ideal materials for roof sheathing systems, and following these simple construction steps will ensure optimal performance. This procedure keeps internal stress from accumulating in panels. Bulk pricing for 1/2 inch is $22.37 per sheet, and you need to buy 70 sheets. Tie a rope around the OSB and pull it up onto the roof. I used 7/16” OSB, a wall sheathing I’ve been very happy with in the past. You've decided it's time to replace your roof. We’ve collected our best articles and videos on the topic to help you out. Typically 3/4"(18mm) for floors and 3/8" (9mm) for walls and 1/2" (11mm) roof. If necessary, trim panel ends to center on framing. Edge clip requirements depend on the relationship of the panel Span Rating to the actual distance between roof framing. Fasten panels with a minimum of 8d Common (0.131-inch by 2-1/2-inch) nails spaced a maximum of 6 inches on center at supported panel ends and edges. Take the roof's total square footage and divide by 32. Nail a 2x4 onto the lower part of the roof, to use as a footstop. However, you might find that OSB can better suit your needs than plywood for the roof. Position the first piece of plywood or oriented-strand-board sheathing on the bottom edge of the rafter tails at one end of the roof. West Fraser is a diversified wood products company with more than 60 facilities in Canada, the United States, the United Kingdom, and Europe. Plywood is a bit more expensive, but is usually stronger and is often selected in cases where the roof covering is heavier, such as for slate, clay, or concrete tile roofs. You’ve read 2 premium stories this month. Boards used for sheathing range from those with a 4-inch face to 48-inch-long plywood sheets. You only need some basic tools and materials. Norbord applies the latest in strand & resin technology, combined with continuous press mill capabilities to customize lengths, widths, thickness and surface characteristics. From responsibly sourced and sustainably managed forest resources, the Company produces lumber, engineered wood (OSB, LVL, MDF, plywood, particleboard), and other products including pulp, newsprint, wood chips, and renewable energy. Roof trusses must be dry when sheathing a roof with OSB, to prevent mold growth in the roof, and coverage gaps as the trusses dry and shrink. Once it is cut to the correct size, start at the centre of the sheet and work towards one of the edges placing nails at random intervals. This will provide time for roof sheathing to adjust to humidity and moisture conditions. 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. 1. Most OSB suppliers have a load/span table giving a guide to the spacing of timbers for different thicknesses. What is roof sheathing? Tags: Best of the Blog, Roof Sheathing, Solarbord, Trubord. You need to find a sheathing with a span rating of at least 32/16, which means either 15/32″ or 1/2″ thick OSB. Do not vent exhaust air directly into roof cavity or attic. H-clips provide additional stiffness between bearing points for the unsupported edges of wood panel (plywood or OSB) roof sheathing, along with the necessary 1/8” gap for expansion, as shown below illustrated on a bag of Simpson H-clips. It is generally believed that OSB is cheaper than plywood. The roof consists of : top and bottom sill plate, face plate, 9 - 4x4 treated posts for support, 2x10x12 joist every 16" on center with a 2x4x12 wedged to allow for slope of 1 3/4" per 12 foot side, 5/8" osb, roof felt, tar, and rolled roofing. Working with plywood or OSB sheathing is a pretty straightforward process, but smart techniques can make the job easier, faster, and safer. If you feel the need for sealants, lay a bead of 100% silicone or adhesive silicone before laying the sheet down and make sure the bead is towards the edge of the bottom sheet. January 19, 2018 After receiving a few estimates, some (or all) of the roofing contractors propose to tear off your existing roofing material and re-sheet with plywood. So, dividing the area of the roof by 32 will give you the number of sheets needed. Unless otherwise recommended by the sheathing manufacturer, cover the sheathing with shingle underlayment felt to minimize exposure to weather. OSB is lightweight, relatively inexpensive, and strong enough to resist bending or breaking should someone walk on the roof. OSB is lightweight, relatively inexpensive, and strong enough to resist bending or breaking should someone walk on the roof. What H-Clips Do. If you get 45 or more pounds of pull out resistance, that’s considered acceptable for most applications. Eclipse Radiant Barrier Roof sheathing, Eclipse OSB Wall System sheathing with a radiant barrier air and water barrier, Tuff-StrandXL and StructWall XL are longer format sheets of these product types. 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Net free ventilation area may be reduced to a minimum of 480 square inches for each 1,000 square feet (1/300th) when certain building code provisions are met (see Section R806.2 of the 2012 International Residential Code or Section 1203.2 of the 2012 International Building Code for more details). Most buildings need roof sheathing to support the roofing material and add rigidity to the rafters or trusses. For best appearance, use heavier weight shingles, or laminated or textured shingles. OSB is now the most-used sheathing and subflooring material for new roofs and roof replacements. Each material has its similarities and differences. Sheathing a large expanse like this is relatively straightforward, though job efficiency decreases as the height increases. You should be prepared to have about 15 percent waste, so multiply your figure by 1.15. For pitched roofs, wear skid-resistant shoes. Corrugated roofing is a great way to top a garden shed, shop, or patio. Talking about plywood or OSB for roofing, you cannot miss the information of the cost. 5. The thickness of OSB that you need varies on where it is used in a building. This will mask surface imperfections and reduce the risk of shingle ridging. One option is to try some test fasteners in the OSB. Plywood is a bit more expensive, but is usually stronger and is often selected in cases where the roof covering is heavier, such as for slate, clay, or concrete tile roofs. Use shingle underlayment felt conforming to ASTM D226 Type I, ASTM D4869 Type I, or ASTM D6757 (self-adhering polymer modified bitumen sheet underlayment should conform to ASTM D1970) or check roofing manufacturer's recommendations if delays are anticipated during construction. But OSB is widely used to sheath roofs and to skin the exteriors of houses. Telko makes nine different OSB products of which two are for sub-flooring. I am putting on a flat roof on a building that is 24 x 44 block.
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