The more wood chips there are, the thicker the OSB will be. Brock Commons, University of British Columbia Case Study, Ensemble Acoustical Drywall Ceiling Estimator, New Products: USG Ceilings Inspirational Book, Danoline Acoustical Gypsum Inspirational Book, Terms and Conditions for CGC Sales/Terms and Conditions for CGC POs, Toxic Reduction Act Public Report Hagersville Plant, Strong, durable concrete panel; great uplift ratings, Dimensionally stable; panel will not buckle or warp like wood sheathing; no moisture issues like traditional concrete decks, Installs fast and easy: circular saw for cutting; screws for fastening, Meets the criteria of ASTM E136-12 for use in all types of noncombustible construction. This will require careful layout of the decking placement (in new construction) or careful layout of panels (in existing construction). The dense woodchips compressed together will take longer to dry if they become wet. timber trusses heavy truss roof wood pa glulam beams howard rafters rigidply laminated architectural wooden steel laminate google engineering There are three methods of installing plank decking: controlled random, simple span and two span continuous. The standard sizes and profiles are shown below. Learn about wood products and make a new contact to facilitate material fulfillment for your next project. Originally, plywood was the go-to choice for roof decking. However, no roof is 100% perfect! Plywood panels are manufactured by gluing together three or more cross-laminated wood layers. Find over 140 continuing education courses on wood topics for architects, engineers, general contractors, and code officials. Plank decking is often used where the appearance of the decking is desired as an architectural feature or where the fire performance must meet the heavy timber construction requirements outlined in Part 3 of the National Building Code of Canada. During the installation of OSB, the rough surface side should be facing up. APA Report TT-097provides a summary of considerations andAPA Report TT-061provides information for the condition of inadequate nail penetration. Nominations now open for the 2023 Wood Design Awards. Designed to carry gravity and lateral loads, this dimensionally stable roof deck is mechanically fastened to cold-formed steel joists or framing members, and roof membranes or insulation attach directly over the panels, making installation fast and easy. For more information about how we use cookies please read our cookie policy. As this may not meet the minimum nail penetration of SDPWS Table 4.2A, discussion with the building official may be prudent. Not all decking is the same. This is because OSB is created by taking woodchips, gluing them together, and hot-pressing them down. You have been logged out due to inactivity. The 38 mm (1-1/2 in) decking has a single tongue and groove while the thicker sizes have a double tongue and groove. If you take a look at a sheet of OSB, youll notice the surface isnt extremely smooth. This interactive resource includes up-to-date information on topics from mass timber products and design best practices to taller wood construction and sustainability. This is typically done with common fasteners (e.g., nails, screws, etc.). Oriented standard board (OSB) is created much differently. Overtime, plywood has shown experience to dry much quicker than OSB. Copyright 2022 Wagner Roofing & Construction Solutions. The panels should be installed over two or more spans, with the long dimension or strength axis oriented across the rafter boards or truss cords. The thickness of OSB is controlled the same way plywood is.

The first number is the maximum span for roof sheathing, assuming that the panels are installed with the long dimension across three or more supports, with the edges supported. For example, if the lumber decking is only 1x (3/4 actual thickness) or 2x (1-1/2 actual thickness), nails used to attach the WSP to the decking may only be 1-1/2 long, meaning the minimum nail penetration of SDPWS Table 4.2A may not be able to be met. Here are some things to consider when choosing your decking material to install on a roof. It is common for framing supports, such as roof trusses, to be spaced 24 inches on center. The thicker the material is, the less likely the nails will pull out of the panels. Be sure to check with your local building code requirements and manufacturer recommendations related to roof sheathing. For further information, visit the APA - Engineered Wood Association's website at www.apawood.org. Plank decking is normally produced in three thicknesses: 38 mm (1-1/2 in), 64 mm (2-1/2 in) and 89 mm (3-1/2 in). A roof that leaks isnt doing its intended job .You never want your decking to become wet in any circumstances. Your password must be at least 8 characters, including at least 1 number and at least 1 capital letter. We'll send you a link that lets you create a new password. Fastening schedules have certain requirements for high-wind zone Always pay attention to the thickness of the boards, and work accordingly with your materials. The inspection agencies include a span rating label on the panels, which indicates the maximum spans for that panel. OSB panels are made from multiple layers of wood flakes oriented 90 degrees to each other. Please enter the email address you used to create the account. All questions and answers follow USGs Terms & Conditions. You never know what Mother Nature will bring to the Midwest, so its extremely important to make sure your decking material is completely dry at all costs! The panels should be spaced 1/8-inch apart at the ends and edges. As noted, the diaphragm capacity of the decking is not usedonly that of the blocked diaphragm consisting of the sheathing laid on top. purlin roof lightweight framing sizes profile roofsystemstt Plank decking is available in two grades: Select grade has a higher quality appearance and is also stronger and stiffer than commercial grade. Call our technical support team at 800.USG.4YOU (874.4968). Field fasteners attach the sheathing to the decking to keep panels from buckling out of plane. Installing Metal Roof Panels Over Shingles. Your question and USGs answer may be posted to this page in the future, but none of your personal info will be included. The material is strong, durable, and tested over time. Each material has its similarities and differences. High-performance structural panel and the only one UL Certified for noncombusibility Structural Panel Concrete Roof Deck is a noncombustible, durable structural panel with great uplift ratings. This component is essential in both metal roofing and traditional asphalt shingle roofing. The maximum span for roof sheathing is limited by the stresses and deflections caused by the design loads. You may be able to measure the thickness of the roof decking material with a simple ruler, as seen in the photo below taken during an actual inspection. Questions should relate to this product specifically. In areas where the wind speed is greater than 130 mph, nails for attaching the roof sheathing to intermediate supports should be spaced 6 inches on center for at least the first 48 inches from the ridges, eaves, and gable end walls.

The fasteners should be spaced only 4 inches apart on the panel edge at the gable end wall framing. Plywood panels should be laid with the face grain perpendicular to the rafter boards. To minimize shrinkage and warping, plank decking consists of sawn lumber members that are dried to a moisture content of 19 percent or less at the time of surfacing (S-Dry). This usually isnt a fault in the roof and decking installation. The minimum thickness of lumber roof sheathing should conform to Table 1 below. Since plank decking is not grade stamped like dimensional lumber, verification of the grade should be obtained in writing from the supplier or a qualified grading agency should be retained to check the supplied material. Of course, you dont want either of these decking materials to become saturated. Although plywood is traditionally used to create the roof deck, its becoming more popular for contractors to use OSB. Ideal as an alternative to plywood, metal decking and concrete, this panel won't buckle, warp or create moisture issues for the roof system. While the WSP layer is resisting the diaphragm forces, the decking is acting in the same function that wall studs would in a shear wall or floor joists would in a diaphragmproviding common framing members for two adjacent panel edges to attach to in order to provide shear load transfer between panels. One key detailing and construction item to keep in mind is that the sheathing panel edges must be offset from joints in the decking. Not only will it swell, but the wood chips will also break away. This process takes the original wood chips and condenses them into solid sheets. Click the link in the email to create a new password. deck roofing structural roof plywood decking system components attic cedar gaps Decking can be ordered in specific lengths, but limited availability and extra costs should be expected.

For help with pricing, availability, or delivery, please call. The Michigan Statewide Carpenters and Millwrights Joint Apprentice and Training From 1 story to 18, were here to support the success of your commercial and multi-family wood building projects with one-on-one project assistance. Let us do the research. All Rights Reserved, Douglas fir (D.Fir-L species combination), Pacific coast hemlock (Hem-Fir species combination), Various species of spruce, pine and fir (S-P-F species combination), Western red cedar (Northern species combination). We use cookies on this site to enhance your user experience. Plywood is created by taking extremely thin sheets of woodcalled plies and gluing them together. After hearing the pros and cons of each material, would you use plywood or OSB for your decking? In this condition, the lumber decking is no longer used as the structural diaphragm; the WSP layer is attached to the lumber decking and acts as a blocked diaphragm, using the capacities in SDPWS Table 4.2A. Nails and deck spikes are used to fasten adjacent pieces of plank decking to one another and are also used to fasten the deck to its supports. Metal roofing is quite durable, and panels hardly lift. We can help you find the most appropriate wood solution. These sheets of wood may look similar, but they are not created the same. The required minimum spacing of the fastener being used is determined using the diaphragm shear load or diaphragm capacity per unit length of the connection. This rough side is a screened or skid-resistant coated side. For common installations, the panels are fastened with 8 d common or deformed shank The one character that OSB lacks compared to plywood is water retention. Input the volume of structural wood in a building, and our Carbon Calculator will estimate how much carbon is stored in the wood. Discover the most recent award-winning wood designs demonstrating attributes of strength, beauty, versatility, cost effectiveness, and sustainability. This article covers some tips and details for home inspectors to keep in mind when inspecting the lumber roof sheathing and the general structure of the roof. SDPWS Sections 4.2.7.1 and 4.2.7.1.1 provide specific requirements when using the WSP over lumber decking diaphragm condition. When OSB gets wet, it will swell over time. The thickness of the plywood can be controlled by the number of plies glued together. Design and detailing considerations for designers seeking to increase the diaphragm capacity of lumber decking systems. decking glossary roof spaced sheeting roofing residential Well get back to you as quickly as we can. InterNACHI can help you get licensed in your state or province, Sheathing provides the base for attaching the roof covering and adds strength to the framed structure. Cost, durability, and composition are all varying elements in each material. locations and where the roof is specially engineered. There should be at least 3/8-inch of space between the fastener and the panel edge. 2022 WoodWorks All Rights Reserved. Plank decking is usually used in mass timber or post and beam structures and is laid with the flat or wide face over supports to provide a structural deck for floors and roofs. and provides certification to help you stand out from the crowd. If youre a contractor, this is no news to you. Another consideration is whether minimum nail penetration values into the decking can be met. Terms & Conditions Privacy Policy, Designing and Building with Mass Timber: Design, Planning and Performance, Mid-Rise Design: Optimizing Size, Framing Efficiently with Engineered Wood, Protective Design in Mass Timber Construction, Nominate your project for a 2023 Wood Design Award, Tall Wood Corner with Ricky McLain | June 2022, New Installer Training Programs: Gearing Up the Workforce for Mass Timber Construction, Calculating the Carbon Stored in Wood Products, Introduction to Whole Building Life Cycle Assessment: The Basics, When to Include Biogenic Carbon in an LCA. A general design rule for controlled random plank decking is that spans should not be more than 600 mm (2 ft) longer than the length which 40 percent of the decking shipment exceeds. Individual planks can span simply between supports, but are generally random lengths spanning several supports for economy and to take advantage of increased stiffness. This typically happens when there are strong winds and other weather conditions. At these locations, the diaphragm forces need to be taken out of the sheathing, through the decking, potentially into the boundary framing members (depending on how the floor/roof is framed) and then into the vertical lateral force-resisting systems below. Some roof problems could stem from panels installed over wet decking. In the process of constructing a roof, there are typically two different roof decking materials. OSB is heavier than plywood, and its typically stronger as well. It usually isnt an issue if they get slightly wet from rainwhen given the correct amount of time to dry. The attachment of the decking to the diaphragm boundary framing members (or directly to the vertical lateral force-resisting system) is designed for the unit diaphragm reaction along that line, or the chord force, whichever is greater. Decking is generally available in the following species: In order to product plank decking, sawn lumber is milled into a tongue and groove profile with special surface machining, such as a V-joint. Estimate the wood carbon footprint of your project. For common installations, fasteners are spaced on the edges 6 inches apart, and 12 inches apart along the supports. These tips are useful for home inspectors who perform New Construction Inspections, as well as for inspecting homes that undergo roof repair or replacement due to age or heavy weather events. Both forms of roof decking are installed the same. Customers are choosing OSB to be installed as their roof decking because it can lower the cost of their overall roof installation. Wood structural panels should be attached to the framing in accordance with the following table. The rating appears as two numbers. Both the latter methods of installation require planks of predetermined length and a consequently there could be an associated cost premium. Plywood is less likely to take as long to dry in these circumstances. High-performance structural panel and the only one UL Certified for noncombusibility Structural Panel Concrete Roof Deck is a noncombustible, durable structural panel with great uplift ratings. The second number is the maximum span when the panel is used for floor sheathing. All homes can take quite the beating over the years by Mother Nature! Just because OSB is cheaper, doesnt necessarily mean it lacks in quality. CSA S-6 Canadian Highway Bridge Design Code, Wood design in the National Building Code of Canada, Design Values for Canadian Species used in Canada, 2022 Canadian Wood Council. No matter what you choose, both materials are top of the line and complete the job! It looks like you entered an employee email address, but this is the customer sign-in. Now That Youve Had a Home Inspection book. Use the link below instead. Browse through the WoodWorks award gallery to see the future of wood designed buildings. Discover mass timber projects across the US and connect with their teams. This report suggests that only 1.0 of penetration is required for 8d nails to achieve full diaphragm capacity. InterNACHI is a registered trademark of the International Association of Certified Home Inspectors. A common method of increasing diaphragm capacities in this condition is to install a layer of wood structural panels (WSP)i.e., plywood or OSBon top of the lumber decking. They include plywood, oriented stand board (OSB), and composite panels made up of a combination of wood veneers and reconstructed wood layers. Once the standard diaphragm capacity has been determined and fastener schedules set, the boundary of the diaphragm must be designed. Quadruple your inspection business and reduce your liability with the The use of green decking can result in the loosening of the tongue and groove joint over time and a reduction in structural and serviceability performance.

There are characteristic differences between the two materials. nails. Plank decking can be used in either wet or dry service conditions and can be treated with preservatives, dependent on the wood species. The label on the far left is a common rating label for sheathing installed on roof trusses spaced 24 inches on center, which is widely recognized as an economical construction method for residential roofs.

Roof decking is the layer between your metal roofing panels and the structural elements of your roof. Consider us an extension of your team. The capacities of lumber diaphragms are given in Table 4.2D of the American Wood Councils Special Design Provisions for Wind and Seismic (SDPWS). This will help keep everything square and aligned while the sheathing panels are laid down and fastened. Stay up-to-date on industry news, innovative projects, and more. Please check your email. When designing wood-frame structures with lumber floor and roof decking, either new construction or modifications and rehabilitations of existing construction, the diaphragm capacity or aspect ratio of the lumber decking system may be inadequate and require reinforcing measures. The only downfall when comparing the two materials is cost. Our customer support team will get back to you as soon as possible. The contractor can choose an oriented standard board (OSB) or plywood to create the decking of the roof. Plank decking is most readily available in random lengths of 1.8 to 6.1 m (6 to 20 ft). OSB is incredibly more cost-efficient than plywood.

A typical specification for random lengths could require that at least 90 percent of the plank decking be 3.0 m (10 ft) and longer, and at least 40 percent be 4.9 m (16 ft) and longer. Lumber roof sheathing and lumber roof panels are terms used in the International Residential Code that refer to panels manufactured with fully waterproof adhesive. Wind & Hail Roof Inspection and Replacement. Blocking can help correct areas with twisted framing, as well as provide surface for the panels. Additional options to evaluate the seismic capacity of existing lumber decking can be found in ASCE 41-13. Thicknesses greater than 38 mm (1-1/2 in) also have 6 mm (1/4 in) diameter holes at 760 mm (2.5 ft) spacing so that each piece may be nailed to the adjacent one with deck spikes. The only thing different is the choice of thickness you use with each. Fasteners should be driven flush with the panel surface.

Plank decking may be used to span farther and carry greater loads than panel products such as plywood and oriented strand board (OSB). Lumber decking, particularly when perpendicular to the supports, is a much more flexible diaphragm system than WSP diaphragms and does not effectively share load with the WSP diaphragm. Plank decking is required to be manufactured in accordance with CSA O141 and graded under the NLGA Standard Grading Rules for Canadian Lumber. Rafters should be straight and in alignment during the installation of sheathing.
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