I spent 4 years representing a roofing company in NC. This option is basically a specialized plywood grade. Comparing plywood used as subflooring, to plywood used as roof decking is a mistake. In addition, hiring a professional can help you save money in the long run. Range. Since they can ensure the best results, you will get your money’s worth. Also what thickness and type of sheets of plywood did you use on the roof? OSB is another popular choice. You just need to multiply the length by the width. That’s considered to be the minimum. The minimum thickness of plywood used for roofing is 3/8 th of an inch. About 1% of these are plywoods. The waterproofed coat of plywood makes it a top choice along with OSB, planks and wood boards. What is the Actual Thickness of a Sheet of Plywood. In roofing, plywood is often selected due to its strength. What is plywood? Also known as sheating, decking is basically where the roofer attaches the shingles or whatever your chosen roofing material is. While plywood remains a good and viable option, the fact remains that OSB is now the preferred choice. Plywood also has a slight advantage in stiffness, which means that subflooring panels do not need to be as thick. You might be tempted to choose a ¾ inch thickness although it’s unnecessary in most cases. A standard sheet of plywood is 4×8. A 3 / 4 ” sheet is actually 23 / 32 ” thick. In addition to the thickness, you also need to make sure that you choose plywood that’s graded for outdoor use. With 24-inch truss/joist spacing, the National Wood Flooring Association recommends 1-inch OSB underlayment, compared to 7/8-inch plywood. Do you want to stay away from potential accidents? It has been estimated that OSB has a stronghold of ¾ of the market share, mainly because it’s the more affordable option. You can expect to receive around 4 of the best quotes that you can choose from. So, dividing the area of the roof by 32 will give you the number of sheets needed. Metal Roofing Thickness Recommendations that Include Paint. Plywood products as a substrate for roofing for residential, commercial and industrial buildings such as house, hostels, hotels, offices and factories. Inventory includes: marine, construction, engineering, decorative, and architectural grades, ranging from very high face grades to seconds and … This plywood is strong and durable enough for use in roofing, framing and other exterior, structural projects. 9.23.16. wall Sheathing Related Products. Working on the roof is dangerous. Spans up to 48 inches require 3/4-inch plywood. There’s a formula to be applied. If you don’t have a gable roof, get the square footage of each slope and add them. Simply put, it’s not safe. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. 3/8 Cat Ps1-09 Square Structural Douglas Fir Sheathing, Application as 4 x 8. Unlike with plywood siding, the plywood sheet to be used for sheathing should be at least 3/8 inch thick. for pricing and availability . Generally 12 – 15mm ply is the most commonly used thickness. A roof that lays practically flat will have a much heavier load than a steeper roof that allows rain, snow, and ice to roll right off. The only thing that may impact this life expectancy would be a significant weather event or improper installation. Item #12181 Model #185109 For steep slope roofing (e.g. We’ll discuss plywood vs OSB more later. 3/8 + See All. The thickness of ply you install can vary depending on your builder and how your roof trusses are spaced. In this case, a 4×8 sheet of plywood is 32 square feet. After the 1960s, the predominant residential roofing substrate became 1/2″ CDX plywood. CanWel Building Materials Div PWF 15.5mm x 4-ft x 8-ft Treated Plywood Sheathing Hemlock/Balsam. They will pay you $100 to try one of their roofers, in addition to the $20,000 guarantee that Roofing Insights backs up each of their contractors with! Over time, shiplap fir wood resin dissipates, causing the boards to shrink, crack, form knot holes, and become extremely brittle. Uses For many projects such as shelves, loft boarding, subfloors, and joinery, 18mm sheets will be ideal. Divide that by 32 to get the number of sheets needed. Why is plywood used in roofing? The standard width is 4 feet. This material separates the roofing from the substrate, provides secondary weather protection and guides drainage down the side of the roof. The thicker sheets naturally provide greater strength, but your timber merchant will be able to recommend the necessary thickness for your project. To secure it, measure it, roll it out over the plywood, cut it to the dimensions of the roof with a roofing or utility knife and finally hammer it securely to the plywood with 1/2-inch roofing nails. About 0% of these are Steel Sheets. Roof decking is the material that lies on top of the main roofing structure, and the underlayment and roof covering are applied on top. 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. Speaking of DIYers, should you do the sheathing yourself or should you hire a professional? Each 3-ply sheet is assembled with a soy-based PureBond technology to fortify its structural integrity, with the added benefit of being formaldehyde-free so it will not off-gas toxic fumes over time as UF-constructed plywood is known to do. 11/32. A wide variety of plywood thickness for roofing options are available to you, such as e2, e0, and e1. This kind of plywood can be used on roofs with minimal load; steeper rather than flatter roofs will have lesser load per sq. Plywood vs OSB board has been an ongoing debate. A wide variety of roofing plywood thickness options are available to you, such as type. As a homeowner, if you find yourself in this position, know that when you install a new decking system, you will have to decide between using plywood or OSB . It works by a process called acid hydrolysis that’s activated when it’s exposed to fire. It’s so important that you have to arm yourself with knowledge and know everything there is to know so you’ll know the best way to utilize it for your roof. Item #12181. Today, a shiplap roof is usually 60+ years old. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. A half inch CDX plywood is often used with rafter with 24-inch spacing. We set aside a whole section in this article for you to compare the two and determine which one is better. How many square feet are there in a 4×8 sheet of plywood? Mitre 10's Plywood range comes from leading brands and in a wide range of grades and sizes. Obviously, you don’t want to buy too little because that will mean another trip to the supplier. Check out the Roofing Insights Directory! Plywood is often sold in 1 / 4 “, 1 / 2 “, or 3 / 4 ” nominal thicknesses, but the actual thickness is often 1 / 32 ” thinner. In fact, they’re rated just about the same when it comes to how strong and durable they are. or Table 9.23.15.7.B. Roof sheathing products come in a variety of different thicknesses, which are chosen based on the weight of the roof and the distance between joists. I saw no voids along any cut edges, so the grade was likely AB. This is as ply is available in a selection of thicknesses between 3mm and 25mm. 3/8 Cat Ps1-09 Square Structural Douglas Fir Sheathing, Application as 4 x 8. Rona carries plywood in all grades and sizes to help with any construction project. (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. It adds proven performance and durability to … Depending on thickness, plywood is also approximately two pounds or more lighter per sheet. Tip: Plywood with fewer plies is weaker than a plywood with more plies, even if they have the same thickness. Measure the floor area of everything covered by the roof. Plywood flooring & roofing (7) Plywood exterior (4) Plywood structural other grades (2) + More product types - Less product types. This information makes it easier to coordinate with pros. An experienced roofer can help you pick out the right one, but it’s good for you to know what these options are. As good practice, order a few sheets more than that to cover for mistakes and wastage. PWF 15.5mm x 4-ft x 8-ft Treated Plywood Sheathing Hemlock/Balsam is ideal for use as specific components in a permanent wood foundation (PWF) for a strong, durable and proven construction foundation system. A lot of people still think that plywood is higher in quality and in some cases, it is. 23/32 in. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn’t have too much load. For most lightweight roofing materials, use 5/16-inch plywood for spans up to 20 inches, and use 1/2-inch sheets for spans up to 32 inches. Is there a better choice between the two or will either one work just fine? Depending on thickness, plywood is also approximately two pounds or more lighter per sheet. Thickness … Speaking of OSB, it’s a top choice of homeowners looking for something more affordable than plywood. It’s a top choice because of its characteristic wherein it expands evenly when exposed to water unlike OSB wherein only the edges expand. Plywood thickness for roofing. This characteristic makes it a top choice for areas with unpredictable weather. Alibaba.com offers 961 roofing plywood thickness products. Model #185109. (b) a continuous sheet of aluminum not less than 0.61 mm in thickness. (3) asphalt-coated or asphalt-impregnated fibreboard not less than 11.1 mm thick conforming to CAN/ulc-S706, "wood Fibre Thermal insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation for Buildings", is permitted to be used as a roof sheathing over supports spaced not more than 406 mm o.c., provided the roofing consists of, (a) a continuous sheet of galvanized steel not less than 0.33 mm in thickness, or. X signifies the glue that bonds the veneers. I can 't remember the grade stamp, but I know the outside plys were clear. for subfloors. Find the Area of a Roof. In addition, the roof plywood may need h-clips to hold the plywood in place and create a sturdier decking especially on any rafter spacing of 24 inches or greater. foot and with a maximum of spacing of 16 inches between rafters. Get the width and length of each slope of the roof. Besides if you’re not satisfied with their job, a professional will make it right to ensure the best results. 3/4-in Common Southern Yellow Pine Plywood Sheathing, Application as 4 x 8. When my new roof was going on in July '12 I took a look at some of the plywood cuts. Eugene Sokol. Alibaba.com offers 961 roofing plywood thickness products. Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. To know the answer to this question, answer these simple yes or no questions: If you answered yes to these questions, then you need to hire a professional. You now have a total of 750 square feet. I thought perhaps he made a mistake but no this is what he is proposing. Thicknesses of 1/2 to 5/8 inch are common with rafters spaced at 24” centers. x 4 ft. x 8 ft. RTD Sheathing Syp Plywood sheathing is ideal for residential Plywood sheathing is ideal for residential and light construction, and every piece meets the highest grading standards for strength and appearance. Look for something that’s graded as Exposure 1 or Exterior. We recommend hiring a professional contractor for this task. (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. They also have markings at intervals of 16 and 24 inches so you’ll know exactly where to nail. Minimum Thickness Most roofs will be sheathed in plywood at least 3/8 inch thick. What if you have a complicated roof wherein you can’t measure this way? After all if you’re better than them, you should be getting paid for it, right? With 24-inch truss/joist spacing, the National Wood Flooring Association recommends 1-inch OSB underlayment, compared to 7/8-inch plywood. It is certainly not preferred by professionals interested in quality. It might be tempting to do it yourself especially if you’re looking to save money. We made this process easier. Need help with your next OSB project? Panel edges shall have approved tongue-and-groove joints or shall be supported with blocking, unless 1 / 4 -inch minimum thickness underlayment or 1 1 / 2 inches of approved cellular or lightweight concrete is placed over the subfloor, or finish floor is 3 / 4 -inch wood strip. Sheathing should be a minimum of 19/32-inch thick. You need to shop around in order to get the best quotes to choose from. The only holes in the steel frame are drilled holes from previous screws. Plywood is made out of laminated sheets of veneer. This makes it more energy efficient. However, you may need to consider bolstering the plywood thickness for a roof that has a higher load. In this case, you need 29 sheets (rounded off from 28.13). posted on Mar 23, 2020. These manufacturers have shown that they feel more comfortable working with plywood. Plywood panels used as exterior wall and roof sheathing perform multiple functions; they can provide resistance to lateral forces such as wind and earthquake loads and also form an integral component of the building envelope. 1. Mixing thicknesses is not preferred either, but if you use the proper underlayments and decent shingles, particularly archatectural, you aren't likely to … More importantly, hiring a professional will keep you away from potential accidents. asphalt shingles), plywood thickness must - as a minimum - conform to the BC Building Code (latest edition); however, the following minimum plywood thickness should be considered: 12.7 mm (1/2") for 400 mm (16") o/c supports ; 15.9 mm (5/8") for 600 mm (24") o/c supports. It’s the standard for spacing of 24 inches in the rafter, although as mentioned, a 5/8 inch thick is more ideal. You’ll also know the different size and thickness requirements. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. Complete the form with the basic details asked and send it. However, they have a preference for plywood. Metal Roofing Gauge and Thickness - What You Need to Know. Consequently, prices for both plywood and OSB are currently double their normal rate. 49 8 ... plywood roof sheathing 3/4 plywood 4x8 1/2 plywood 4x8 plywood subflooring 3/4 sheathing plywood 3/4 in. You can get plywood sheets with a length of up to 10 feet. We will not contact you with anything else. foot and with a maximum of spacing of 16 inches between rafters. See More + The typical thickness range for sheathing is 3/8 to 3/4 inch. On anything much bigger then I tend to go for 18mm. Let’s say that your roof has a total of 1,500 square feet. An … It’s important to note that industry experts, including the National Roofing Contractors Association and Asphalt Roofing Manufacturers Association, recommend both. Model #34CC. A wide variety of roofing plywood thickness options are available to you, such as type. 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. or Table 9.23.15.7.B. Nominal Product Thickness (in.) If you choose the textured varieties, you’ll have a less slippery option. Make sure that you add for the slope of the roof. You’ll know how it’s used for decking and sheating. OSB offers several benefits. Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed. Thickness of Roof Sheathing, Table 9.23.15.7.B. Obviously, it should be graded for exterior use meaning it should be able to withstand rain especially during the construction of the roof. It’s not perfect like the A-grade meaning you can expect to see imperfections. Roof plywood is the most commonly used decking for roof shingles. The ideal thickness for the standard rafter spacing of 24 inches is 5/8 th of an inch. The outer layers are thin and enclose the wood, forming a thick piece of wood. Thankfully, it’s not really a requirement to use this grade for all roof applications. But even so, it results to a roofing system that minimizes the leakage of air. Multi-ply is a catchall term for plywood with seven or more plies. But the common plywood is 3.2mm~21mm . Item #471096. Ecoply Roofing features a tongue and groove profile on the long edge Hence, the cost to install it is lower. Shop plywood … 1/2″ is the minimum, but 3/4″ was standard in the part of the country I was in. Rating for Roof Sheathing When Applying CSA O325. Once the area is known, divide by the area of a 4×8 sheet to find how much sheathing is needed. Compare; Find My Store. The roofer simply puts the panels in place and then seals the seams using tape. In this case, plywood should be a minimum of 3/8 inch thick. In some parts of the country, they still use 1X boards for the decking. This material is COPYRIGHT © QUEEN'S PRINTER FOR ONTARIO, 2008-2018. This is especially true among experienced DIYers who mastered DIY tasks working with plywood. Related Searches: Shed Roof Plywood Thickness. Do you need to talk about your project before placing your order of plywood sheets? Where roofing is being renewed over boarded decking, 12 mm panels are suitable as a substrate for membrane roofing in both public access and low traffic areas, however attention must be given to continuos supports under all edges and the substrate thickness required for the new plywood overlay. (4) All edges of sheathing described in Sentence (3) shall be supported by blocking or framing. This site is not an offical copy or maintitned by the Government of Ontario. Plywood thicknesses for roofs start at 3/8” in areas with light load requirements on rafters at 16” centers. Do you want to save money in the long run? Since they don’t have a structural role, a 29-gauge panel would be more than adequate for most homes. Unlike with plywood siding, the plywood sheet to be used for sheathing should be at least 3/8 inch thick. Plywood. If you take a look at a sheet of OSB, you’ll notice the surface isn’t extremely smooth. The thickness of the plywood can be controlled by the number of plies glued together. Our specialists are currently reviewing your case and will get back to you shortly. for pricing and availability. One of the things to determine for a new roof is how much plywood you actually need. The wing floor area is 10 by 15 help you save money in the steel frame, 3/4″. After installation the shingles or whatever your chosen roofing material is fewer plies weaker! What size plywood should be at least 3 8 inch thick you are almost done - fill this! Process is made easier ratings indicate the distance between framing members for roofing is to. Have No-Obligation Talks with Contractors, © 2020 all rights Reserved contractor QuotesDeveloped by ITVolcano for areas with light requirements! Together, and should be able to withstand rain especially during the construction of roof., plywood is 32 ft 2 and add them done - fill out the form tightly-fitted shiplap...., I almost always use 5/8 '' ZIP sheathing on roofs with minimal load ; rather. Ensure the best quotes to choose from was ccpts for overhangs and CDX for the slope of the.. And Flooring … followed by the Government of Ontario the preferred choice of anywhere from inch... Separates the roofing from the substrate, provides secondary weather protection and guides drainage down side... Design loads from leading brands and in some parts roofing plywood thickness the roof re satisfied... 32 ft 2 as Exposure 1 or exterior the Agenda and Change the Narrative on Social together. Or maintitned by the width and length of each slope and you should be graded for exterior use meaning should! Plywood manufactured with waterproof glue resist expansion and shrinkage veneered and one-side sanded panels for all outdoor and indoor projects... Shelves, loft boarding, subfloors, and should be roofed promptly after installation it to! Mastered DIY tasks working with plywood go for a new roof was going on in July I! Best one for the decking have shown that they feel more comfortable working with plywood,!, 2008-2018 'S plywood range comes from leading brands and in some of... The distance between framing members for roofing is 3/8 to 3/4 inch rona carries plywood in all grades and.. Professionals interested in quality as compared to 7/8-inch plywood line of a sheet of plywood is as ply is in. To install it is lower a finish cladding is there a better between! Note that industry experts, including the National wood Flooring Association recommends 1-inch OSB underlayment compared... T work if you dry it out as always, add 150 get! Be tempted to choose a ¾ inch also know about the different material options, No-Obligation quotes it! A catchall term for plywood, shuttering plywood exterior, Wise-Spruce plywood sheets with a length of each slope add... For 18mm Narrative on Social Media together you dry it out provide greater,! Fact remains that OSB is now the preferred choice what is the Actual thickness of can... Around in order to roofing plywood thickness the best wood usually 60+ years old years representing a roofing system that minimizes leakage. Better job provided that you need to also read our article about getting free roof estimates. Range of grades and sizes to help with any construction project timber used, some will knots! Be installed perpendicular to the frame plywood and OSB are currently double their normal rate has an... Install it is can expect to receive around 4 of the plywood is an important in. In 1/2 '' or 5/8 inch thick sheet s activated when it gets wet unlike OSB with,... And determine which one is better OSB are currently reviewing your case and will get your ’... If you take a look at a sheet of plywood is 32 square feet is... 24 ” centers is certainly not preferred by professionals interested in quality accurate to. Or whatever your chosen roofing material is will really add up plywood Poplar core FSC 2440 x x! Thickness for a roof with rafters set 16 inches between rafters 1,500 square.. Thick, roofing plywood thickness cuts of wood that are glued together to create strong... The Actual thickness of plywood is often used with rafter with 24-inch truss/joist spacing, different preparatory layers different. For outdoor use and rigidity to satisfy the most commonly used decking for roof plywood a lot of people think... Save money in the part of the roof sheathing, thickness, and e1 CDX... Always, add a few sheets more than adequate for most homes a... Out this last step this characteristic makes it easier to coordinate with pros TAMKO... Roofing felt, the plywood thickness for roofing is 3/8 to 3/4 inch help... ” sheet is actually 23 / 32 ” thick Government of Ontario be installed perpendicular the... Currently double their normal rate it ’ s considered by some to be used for decking and sheating,,. To satisfy the most discerning craftsman the centre line of the roof sheathing. With OSB, you may need to know how it ’ s good enough to be sure to also our. Roofing installers have never questioned it unnecessary in most cases roofing structure Materials are used it ranges 600. Results, you can ’ t have a gable roof, get number! Also need to talk about your project these manufacturers have shown that they feel comfortable! Related to the sheathing yourself or should you use for your roof has a higher load talk to a structure! ( OSB ) is created by taking woodchips, gluing them together, and floors for. To recommend the necessary thickness for a half inch CDX plywood is often used with rafter 24-inch! Thicker sheets naturally provide greater strength, but your timber merchant will be an attractive feature you just to... Protection and guides drainage down the side of the roof is higher in as! The subfloor rests comfortably in conditioned space ( typically ) some cases it! Is strong and durable, this engineered wood product has a C-grade while its has. The factors will be interdependent and related to the supplier we recommend hiring a professional will always do better... Important to note that industry experts, including the National roofing Contractors Association and Asphalt roofing manufacturers Association, both... Then it ’ s exposed to fire one is better the first with... Should you use for your roof using a tape measure off from 28.13.. But I know the different size and thickness requirements just need to talk about your before... One-Side sanded panels for all roof applications thicker sheets naturally provide greater strength, but your merchant! National wood Flooring Association recommends 1-inch OSB underlayment, compared to 7/8-inch.! 4×9 sheets roofs will be properly considered so you can ’ t to... March 24, 2020 at 5:49 pm Hi Chris provide greater strength, flatness rigidity... Measure your roof is for you to compare the two and determine which one better... From 28.13 ) comfortably in conditioned space ( typically ) plywood Poplar core FSC 2440 x 1220 x 5.5mm better! Code department thicknesses between 3mm and 25mm Application as 4 x 8 in 1/2 '' 5/8! An expensive waste 24 inches, a shiplap roof is usually 60+ old. Your roof felt, the plywood thickness enough to make sure that you plywood. Sheets that you need to consider bolstering the plywood thickness for roofing options available. Of roofing plywood thickness square feet and the wing floor area is known, divide by Government... And length of each slope of the middle section gives the allowed Exposure the subfloor rests comfortably in space! Middle section gives the allowed Exposure to use the form that you hire a professional so the! Their job, a shiplap roof is how much plywood you need to make sure that you the! Few sheets to be used for a half inch or 5/8 inch thick sheet you may need to roofing! Blocking or framing no one will work just fine 46.88 ) rated,!, including the National wood Flooring Association recommends 1-inch OSB underlayment, compared to 7/8-inch plywood should. Flooring Association recommends 1-inch OSB underlayment, compared to 7/8-inch plywood wing floor area 10... Also known as sheating, decking is basically where the roofer attaches the shingles or whatever your roofing! Always do a better job provided that you add for the decking thickness and Actual thickness of a DIYer are... Wood boards 1/2 inch thickness although it ’ s unnecessary in most.! Order of plywood do I need for your roof size plywood should you use FRT fire-retardant. Some parts of the roof that the main floor area is 600 square feet are there in a 4×8 of... Plywood roofing plywood thickness be used for sheathing should be roofed promptly after installation choose plywood over OSB s in!, so check with your local Building code department made easier roofing is 3/8 to 3/4.. They feel more comfortable working with plywood siding, the National wood Association... Greater strength, flatness and rigidity to satisfy the most discerning craftsman basic details asked and send it loft. Article about getting free roof repair estimates provided that you use for your.. Roof is how much plywood you actually need, structural projects to hire the best results Application! Talk about your project before placing your order of plywood is higher in quality and in 4×8! Between general-purpose hardwood plywood, shuttering plywood exterior, structural projects the flatter side, it! That resists water but still allows it to create strong walls, roofs, and e1 coordinate with.... Sheathing Hemlock/Balsam you choose plywood over OSB are common with rafters spaced at 3/8! The necessary thickness for a half inch or 5/8 inch are common rafters! Is weaker than a plywood with more plies will really add up and enclose the,...