However, it’s good enough to be used underneath roofing felt and shingles. The job will also be done right which will minimize mistakes and wastage. 1,500 ÷ 32 = 46.875 sheets Roofing plywood thickness? This kind of plywood can be used on roofs with minimal load; steeper rather than flatter roofs will have lesser load …. There’s a formula to be applied. That, in a nutshell, is the one big advantage plywood holds over OSB. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? For a decking, or substrate underneath shingles, you can usually use either material. Obviously, it should be graded for exterior use meaning it should be able to withstand rain especially during the construction of the roof. They must be covered with some type of sheathing or decking before most finishing roof materials can be applied. They will pay you $100 to try one of their roofers, in addition to the $20,000 guarantee that Roofing … Consequently, prices for both plywood and OSB are currently double their normal rate. OSB is also more affordable. That’s considered to be the minimum. Alibaba.com offers 332 plywood thickness for roofing products. Many Factors Affect Thickness. These manufacturers have shown that they feel more comfortable working with plywood. Since the boards used for shiplap were manufactured here in the Pacific Northwest, it was still cheaper than plywood up through the 1960s. However, each option has its own benefits and downsides and it’s a good idea to know about them so you can make an informed decision. The plywood is nailed at roughly 150 mm spacings, ensuring the ends finish on the centre line of a truss. If you don’t have a gable roof, get the square footage of each slope and add them. This material separates the roofing from the substrate, provides secondary weather protection and guides drainage down the side of the roof. What if you have a complicated roof wherein you can’t measure this way? Divide that by 32 (the square footage of each 4×8 plywood sheet). The roofer simply puts the panels in place and then seals the seams using tape. Check out the Roofing Insights Directory! But still, no one will blame you if you choose plywood over OSB. The thickness needed will depend on the purpose and use-case. I saw no voids along any cut edges, so the grade was likely AB. R905.2.8.2Valleys. So, what size plywood should you use for your roof? One of the major differences between OSB and CDX plywood is how well each holds up against water. It is also available in multiple thickness ranging from 2mm to 38mm. Minimum Thickness… There two Plywood Thickness : Nominal Thickness and Actual Thickness. Complete the form with the basic details asked and send it. 1/2″ is the minimum, but 3/4″ was standard in the part of the country I was in. The typical thickness of roof sheathing is about 7/16-inch, which is just under 1/2-inch. One of the things to determine for a new roof is how much plywood you actually need. Unsanded, plywood sheathing panels are specially designed for walls and roof applications. The plywood is further divided into two grade that is MR grade and BWR grade. Ready to talk to screened pros? That, in a nutshell, is the one big advantage plywood holds over OSB. We will not contact you with anything else. The choice of plywood grade depends on the type of roofing, and on the level of finish required. This plywood is strong and durable enough for use in roofing, framing and other exterior, structural projects. We also carry pre-cut project panels that are available in different sizes that may vary by store. In high winds, the less roof sheathing thickness, the more likely the roofing … Since they can ensure the best results, you will get your money’s worth. Small best plywood for rv roof repair services done today can cost you state $400. http://www.homebuildingandrepairs.com/framing/index.html Do you really need to install thicker plywood, when building your floors or roofs? Roofing plywood allows to settle roof effectively and cost-effectively. Knowing this number can help you determine how many sheets of plywood you need for your roof. The minimum thickness of plywood used for roofing is 3/8 th of an inch. All you need to do is to use the form that you see on this page. Multiply the width and length of each slope and you should get the square footage of that slope. Plywood vs OSB board has been an ongoing debate. Cap flashing shall be corrosion-resistant metal of minimum nominal 0.019-inch (0.5 mm) thickness. Do you want to stay away from potential accidents? An instance of similar calculations is given below. I don't think 3/8 is ever enough. Is there a better choice between the two or will either one work just fine? Unlike with plywood siding, the plywood sheet to be used for sheathing should be at least 3/8 inch thick. Roofs with very heavy loads may require 3/4-inch thickness. Originally, plywood was the go-to choice for roof decking. It is rot resistant with knots replaced with football shaped plugs to give it a smooth moisture-resistant surface. 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. Even the Engineered Wood Association agrees to this. The minimum thickness allowed for ceramic tile installations is two sheets of 5/8-inch thick plywood. For example, if your roof is 1,500 ft 2 then it will take 47 sheets of plywood to sheath it. The material is strong, durable, and tested over time. 11/32 in. 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. What we don’t recommend is for you to hire the first contractor with a good offer. x 4 ft. x 8 ft. Rtd Southern Yellow Pine Plywood Sheathing Plywood sheathing is ideal for residential Plywood sheathing is ideal for residential and light construction. If they know that you’re shopping around for the best deal, you can expect to get the best quotes. Get Ready to Have No-Obligation Talks With Contractors, © 2020 All rights Reserved Contractor QuotesDeveloped By ITVolcano. Get the width and length of each slope of the roof. Multiply that by 2 if you have a gable roof and that’s the total square footage of your roof. Sheets of 7/16-inch thick, with no edge support, can be used in an area where the snow load is 30 pounds per square foot. Plywood is often sold in 1/4″, 1/2″, and 3/4″ thicknesses, though other sizes are also available. What Size Plywood should You Use for your Roof? You'll find varying opinions (some quite strong) on the OSB vs. plywood debate for sheathing. Every piece meets the highest grading standards for strength and appearance. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Obviously, you don’t want to buy too little because that will mean another trip to the supplier. You need to shop around in order to get the best quotes to choose from. For the curious – 7/16” OSB has a span rating of 24/16 and with supports every 24 inches is good for a roof live load of 40 psf (pounds per square foot) with a 10 psf dead load. Let’s say that the main floor area is 10 by 20 feet and the wing floor area is 10 by 15. Plywood Ratings, Grades & Sizes. 1/2″ is the minimum, but 3/4″ was standard in the part of the country I was in. Consequently, prices for both plywood and OSB are currently double their normal rate. Builders like to use plywood, due to its structure stability, water resistance, and low cost. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? If you choose the textured varieties, you’ll have a less slippery option. It is typically made in 4-by-8-foot sheets, although longer panels are available for special purposes. It works by a process called acid hydrolysis that’s activated when it’s exposed to fire. Although plywood is traditionally used to create the roof deck, it’s becoming more popular for contractors to use OSB. With 24-inch truss/joist spacing, the National Wood Flooring Association recommends 1-inch OSB underlayment, compared to 7/8-inch plywood. Allow them become larger troubles as well as roofing substitute simply months from currently implies you invest 4, also 5 numbers. I can 't remember the grade stamp, but I know the outside plys were clear. This kind of plywood can be used on roofs with minimal load; steeper rather than flatter roofs will have lesser load per sq. Thickness looked to be 3/8" or metric equivalent. Available either untreated or H3.2 CCA. Working on the roof is dangerous. I saw no voids along any cut edges, so the grade was likely AB. Check out the Roofing Insights Directory! You just need to multiply the length by the width. For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kN/m2. OSB is incredibly more cost-efficient than plywood. Different Material Options & Types of Roof Plywood. Plywood's Advantage over OSB? This makes it more energy efficient. A 4×8 sheet of plywood is 32 ft 2. It should have a minimum thickness of 18mm. It’s not perfect like the A-grade meaning you can expect to see imperfections. As good practice, order a few sheets more than that to cover for mistakes and wastage. However, they have a preference for plywood. Simply put, it’s not safe. Do you want to save money in the long run? Plywood's Advantage over OSB? A standard sheet of plywood is 4×8. The savings you’ll get per sheet will really add up. A flatter roof with rafters farther apart may need a thickness of up to ¾ inch. The thickness of the sheet is determined by the ply. This type of plywood won’t sag when used on a 12 inches joist structure. OSB is another popular choice. September 14, 2020 Editor. We recommend hiring a professional contractor for this task. It can be used for the project once the roofing contractor confirms its suitability for the work. This thickness will ensure that the wood is sturdy enough to hold the screws in place and support the metal roofing. A flatter roof with rafters farther apart may need a thickness of up to ¾ inch. By sumitting this form, you agree to be contacted about your project by Homeadvisor and / or other service partners using automated phone technology and / or email. The industry offers a thickness of anywhere from 5/16 inch to ¾ inch. Roofs are framed with rafters or trusses, which are rafters joined by internal braces so they install as a single component. After the 1960s, the predominant residential roofing substrate became 1/2″ CDX plywood. Roofing services rotted roof decking building code for roof sheathing building construction finishing roofing services rotted roof decking roofing services rotted roof decking types of plywood the home depot. Roofing Plywood Thickness. In addition, hiring a professional can help you save money in the long run. foot and with a maximum of spacing of 16 inches between rafters. While it’s not the main material for the roof itself, roofing plywood is an important part in a roofing structure. The minimum thickness of plywood used for roofing is 3/8 th of an inch. The choice of Plywood should be exterior grade per British Standard (BS) 5268-2, WBP (Water & Boil Proof) to BS EN 636-2:1997. (Source: International Association of Home Inspectors). You can easily slip and/or fall. Plywood is used almost in exterior and interior construction applications. In some parts of the country, they still use 1X boards for the decking. That’s considered to be the minimum. You are almost done - fill out this last step. In this case, you need 47 sheets (rounded off from 46.88). The ideal thickness for the standard rafter spacing of 24 inches is 5/8 th of an inch. Since it doesn’t require a roofing felt, the installation process is made easier. About 1% of these are plywoods. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. The typical thickness range for sheathing is 3/8 to 3/4 inch. This is a popular option because it presents homeowners with functional but affordable roof sheathing. Base flashing shall be of either corrosion-resistant metal of minimum nominal 0.019-inch (0.5 mm) thickness or mineral-surfaced roll roofing weighing not less than 77 pounds per 100 square feet (4 kg/m 2). Speaking of OSB, it’s a top choice of homeowners looking for something more affordable than plywood. Thickness … Every piece meets the highest grading standards for strength and appearance. In this case, a 4×8 sheet of plywood is 32 square feet. This is largely regional though, so check with your local building code department. 1. While plywood remains a good and viable option, the fact remains that OSB is now the preferred choice. Bring out the calculator. For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. This minimum wouldn’t work if you have a flat roof. 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. This characteristic makes it a top choice for areas with unpredictable weather. Mixing thicknesses is not preferred either, but if you use the proper underlayments and decent shingles, particularly archatectural, you aren't likely to notice. Speaking of sheets, it’s available in 4×9 sheets. It comes in multiple thicknesses from 1/4 inch to at least 1 inch; those above 1/4-inch typically have five layers of wood. Roofing Types Many different roofing products are now available for use and installation over a plywood substrate. Exterior Plywood is the preferred material for roofing. x 4 ft. x 8 ft. Rtd Southern Yellow Pine Plywood Sheathing Plywood sheathing is ideal for residential Plywood sheathing is ideal for residential and light construction. The major factor to best plywood for rv roof repair is so you with any luck do not need to pay of changing a roof covering. A half inch CDX plywood is often used with rafter with 24-inch spacing. If you live in a townhome with other townhomes around you, building codes may dictate that you use FRT or fire-retardant plywood. Roof decks on homes built before 1970 are often 1×8 fir pre-plywood shiplap. In this case, you can’t use a 3/8 inch thick sheet. The correction recommended by manufacturers is installation of an additional layer of 3/8-inch minimum exterior-grade plywood or OSB roof sheathing on top of the original wood-board roof sheathing. To know how many sheets for the roof sheathing is required it`s enough to make simple calculations. Keep in mind that the load of the roof still plays a role in the plywood thickness. In some parts of the country, they still use 1X boards for the decking. Especially if the trusses or rafters are set on 24" centers. Thicker panels are more rigid and durable but are also heavier and more expensive. And there will be less wood for the roofing to fasten to, that is the most important. Plywood also has a slight advantage in stiffness, which means that subflooring panels do not need to be as thick. This wood is just like regular framing lumber, except it has been factory … Be sure to also read our article about getting free roof repair estimates. The edges of OSB may noticeably swell when exposed to moisture. When this is the case, experts recommend a 5/8-inch-thick sheet. A professional will always do a better job provided that you hire the best one for the project. There are many different types of roofing materials that are available in markets such as Metal roofing, Stone-coated steel, Rubber slate, Solar tiles, Asphalt shingles, Green roofs, and more. For this, you can either go for a half inch or 5/8 inch thick sheet. It’s the standard for spacing of 24 inches in the rafter, although as mentioned, a 5/8 inch thick is more ideal. We set aside a whole section in this article for you to compare the two and determine which one is better. "World." Perhaps, plywood’s biggest feature is the homeowners’ perception of … Alibaba.com offers 961 roofing plywood thickness products. The roofer originally spec'ed OSB (not sure of the thickness but 7/16" is typical) but I didn't feel good about that so I spent a little bit more and got plywood. It doesn’t swell when it gets wet unlike OSB. Let’s say that your roof has a total of 1,500 square feet. The Minimum Plywood for Roofing Plywood Is Layers of Wood. Speaking of DIYers, should you do the sheathing yourself or should you hire a professional? Ecoply is manufactured under a third-party-audited quality control programme and is certified by the Engineered Wood Products Association of Australasia (EWPAA) as compliant with AS/NZS 2269 Plywood Structural. You’re in luck if you have a conventional gable roof because it should have slopes on each side that are identical in dimensions. Open spaces form between the once tightly-fitted shiplap boards. Metal roofing panels rated for "architectural use" attached to purlins (horizontal pieces of wood or metal fastened to roofing trusses) are structurally sound when installed according to your roofing manufacturer's instructions and local building codes. Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed. Metric Thickness and Imperial Thickness . The minimum thickness of plywood used for roofing is 3/8 th of an inch. This removes flexibility in the floor and helps reduce deflection. You’ll know how it’s used for decking and sheating. OSB offers several benefits. The recommended shed floor plywood thickness is 3/4 inch pressure-treated exterior-grade CDX plywood. Need help with your next OSB project? _____ John & Diane, Fulltimers. Bob Haring has been a news writer and editor for more than 50 years, mostly with the Associated Press and then as executive editor of the Tulsa, Okla. The only downfall when comparing the two materials is cost. Uniform load deflection limitations 1 / 180 of span under live load plus dead load, 1 / 240 under live load only. Haring holds a Bachelor of Journalism from the University of Missouri. You might be tempted to choose a ¾ inch thickness although it’s unnecessary in most cases. Plywood sheets are differentiated according to size, thickness, and performance characteristics. Plywood is made with three or more layers of thin wood glued together with the grain alternating. Exterior grade plywood and OSB are the two main choices for roofing. Plywood vs. OSB (oriented strand board) - Ironically, OSB takes longer to get saturated when wet, but it also takes substantially longer to dry. The waterproofed coat of plywood makes it a top choice along with OSB, planks and wood boards. Make sure that you add for the slope of the roof. You’ll also know the different size and thickness requirements. The main floor area is 600 square feet and the wing floor area is 150 square feet. You can create more damages. What Size Plywood for the Roof? Thicknesses of 1/2 to 5/8 inch are common with rafters spaced at 24” centers. This is because OSB is created by taking woodchips, gluing them together, and hot-pressing them down. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. Our specialists are currently reviewing your case and will get back to you shortly. Make your selection based on the type of project you’re working on. Use a staggered pattern when building up rows of plywood sheets. Nominal Thickness and Actual Thickness of Plywood. An experienced roofer can help you pick out the right one, but it’s good for you to know what these options are. Yes, there are several different material options and types of roof plywood. When my new roof was going on in July '12 I took a look at some of the plywood cuts. Contents. About 0% of these are Steel Sheets. But the common plywood is 3.2mm~21mm . Thankfully, it’s not really a requirement to use this grade for all roof applications. What is the best shed floor plywood thickness? Ply roof sheathing provides a safe substrate for roofing crews and can eliminate tile battens or purlins from the framing cost. It’s important to note that industry experts, including the National Roofing Contractors Association and Asphalt Roofing Manufacturers Association, recommend both. Strong and durable, this engineered wood product has a barrier that resists water but still allows it to breathe. © Copyright 2020 Hearst Communications, Inc. The plywood must be exterior grade for all wet areas and it has to be installed in such a way that the joints between each layer do not line up, using what is known as a stagger pattern to keep the pieces from ever lining up. In most cases, standard roofing underlayment is adequate to address the problem. Regardless of thickness, the plywood should be a type suitable for exterior use, graded "Exterior" or "Exposure 1.". It’s a top choice because of its characteristic wherein it expands evenly when exposed to water unlike OSB wherein only the edges expand. 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. If you take a look at a sheet of OSB, you’ll notice the surface isn’t extremely smooth. ... Sheathing Thickness. Install a felt moisture barrier. 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. Roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. This sentiment is shared by representatives from TAMKO and Cellotex – 2 known manufacturers of roofs. #OvercomingObstaclesScholarship: Let’s Put Mental Health on the Agenda and Change the Narrative on Social Media Together! Is a 4/12 Pitched Roof Considered Low or Moderate? Generally 12 – 15mm ply is the most commonly used thickness. Measuring the Plywood Thickness . A wide variety of plywood thickness for roofing options are available to you, such as e2, e0, and e1. foot and with a maximum of spacing of 16 inches between rafters. The wider the rafter spacing, the heavier the shingling, the lower the slope and the heavier the weather load, the thicker the plywood will have to be. For many applications, a layer of plywood underneath your metal roofing is an unnecessary expense. While strand board is stronger in shear force, plywood of the same thickness is lighter – easier to lift on your own. You don’t want to buy too much because that will be an expensive waste. Nominal Thickness is the thickness by which the is generally called or sold in trade, Actual Thickness means the real thickness of a plywood. Tip: Plywood with fewer plies is weaker than a plywood with more plies, even if they have the same thickness. Adding 20% is industry practice. It will support roof loads for most situations and is the standard for most roof applications. How to Put Rigid Foam Insulation on the Roof Before Putting on Shingles. It doesn’t matter how experienced of a DIYer you are. Plywood used for roof decking is typically called sheathing and carries a grade stamp indicating its load and span ratings and other performance factors. The roof deck will be too soft. Plywood thickness ranges from 0.4mm~100mm . While not as good as A-grade and C-grade, it’s good enough to be used for a plywood sheet’s underside. With edge … Also known as sheating, decking is basically where the roofer attaches the shingles or whatever your chosen roofing material is. - American shingles Ecoply roofing Manual 15/12/03 4:23pm page 1 flatter roof with rafters set 16 inches rafters..., the National wood Flooring Association recommends 1-inch OSB underlayment, compared to 7/8-inch plywood both plywood OSB. You might be tempting to do is to use this grade for roof... Also have markings at intervals of 16 inches apart and will get back to you, as... Will mean another trip to the frame least 7/16 inch thick sheet more... Least 3/8 inch thick cost you state $ 400 is determined by the roof itself, roofing plywood:! Process called acid hydrolysis that ’ s expected to have No-Obligation Talks with,. Use either material well as roofing substitute simply months from currently implies you invest 4, 5! Little because that will be plywood thickness for roofing in plywood at least 7/16 inch thick sheet is by! Even if they know that you use for a decking, or substrate underneath shingles you! Greater the load on any one section experts, including the National wood Flooring Association recommends 1-inch OSB,! Withstand rain especially during the construction of the same thickness is 3/4 pressure-treated... Choose plywood over OSB a lot of people still think that plywood is nailed at roughly 150 mm,! Get plywood sheets come in 3ply, 5ply and multi-ply thickness interior construction applications with minimal ;... It will take 47 sheets ( rounded plywood thickness for roofing from 28.13 ) a thickness of up to 10.. Mind that the main floor area is 10 by 20 feet and the wing floor area 10... Plywood span ratings indicate the distance between framing members for roofing is 3/8 to 3/4 inch they have the thickness... Specially designed for walls and roof applications by 15 right choice on purpose! Panels are available to you, building codes may dictate that you use CDX ( plywood ) or (... Minimize mistakes and wastage other exterior, structural projects is used almost in exterior and construction! Is typically made in 4-by-8-foot sheets, and 3/4″ thicknesses, though other sizes are also heavier and more.... So check with your local building code department sturdy enough to make sure that you ’ also... Actual thickness sheets with a 3-inch multipurpose carbide wheel which lends to its stability... Best deal, you will get back to you, such as e2, e0, and them... 32 ( the square footage of each slope of the roof ; the flatter the roof before Putting on.! Internal braces so they install as a single component 8d ring-shank nails should be able to rain! Varying opinions ( some quite strong ) on the Agenda and Change the on! You don ’ t have a look at some of the plywood thickness options are available to you such! Roof applications is weaker than a plywood with more plies, even if you ’... And is the most important on 24 '' centers each holds up against water find out how many feet..., grades and sizes will minimize mistakes and wastage, in a 4×8 sheet of plywood further... Shear force, plywood of the country, they still use 1X boards for the project the! Expect to receive around 4 of the roof deck, it results to a so. Narrative on Social Media together sheath it thickness will ensure that the is... This way as a warning, it ’ s not really a requirement to use roofing,! Is traditionally used to create the roof, get the square footage of each slope of the things determine... Covered by the roof page 1 only takes 2 minutes to fill out this last...., ensuring the ends finish on the centre line of plywood thickness for roofing truss rot resistant with knots with! Equipped with a good and viable option, the predominant residential roofing substrate became 1/2″ CDX plywood also. Framing cost OvercomingObstaclesScholarship: let ’ s not the main differences between CDX and OSB are the two choices! Yourself or should you use FRT or fire-retardant plywood their normal rate OSB ( oriented strand board for! 2003 7751 Ecoply roofing Manual 15/12/03 4:23pm page 1 even wider at ”. Can choose from and then seals the seams using tape yes, there are several material... To find out how many sheets of plywood grade depends on the vs.... And multi-ply thickness small best plywood for roofing options are available in different sizes that may vary by store back... Cutting tool equipped with a length of each slope of the sheet is more on the vs.! There will be an expensive waste been an ongoing debate to make simple calculations its suitability plywood thickness for roofing the.! Plywood to sheath it parts of the roof sheathing is required it ` s enough to be sure wider.! Many square feet on shingles save money in the Pacific Northwest, it should be graded for exterior meaning... This article for you to hire the best results, you ’ ll get per sheet will really up... Many different roofing products are now available for use in roofing, and e1 47 sheets of plywood recommended! Called sheathing and carries a grade stamp, but I know the outside plys were.. The sheathing yourself or should you use for a decking, or underneath... Is 3/8 th of an inch flatter roof plywood thickness for roofing rafters farther apart may need a thickness of anywhere from inch! And hot-pressing them down in place and support the metal roofing on top plywood... A length of up to 10 feet along any cut edges, so grade! For the slope of the plywood thickness options are available to you shortly the isn! Plywood ) or OSB you use for a plywood sheet to be used.... Approximately two pounds or more to find out how many sheets for the by! 5 numbers available to you, such as type for this task and wood boards each will... For both plywood and OSB as roofing substitute simply months from currently implies you invest 4, plywood thickness for roofing... Know exactly where to nail a flat roof remains a good and viable option, fact... For strength and appearance them become larger troubles as well as roofing plywood plywood thickness for roofing divided into two grade that MR. Length by the width safe substrate for roofing plywood obviously, you also need to it... Standard in the long run and shingles look at some of the roof by to! Performance characteristics today can cost you state $ 400 either one work just fine roofing substrate 1/2″! Nutshell, is the one big advantage plywood holds over OSB good as A-grade and C-grade, ’! Always, add a few sheets to be used underneath roofing felt and shingles how strong and durable this. The greater the load on any one section thickness range for sheathing be! Followed by the roof sheathing provides a safe substrate for roofing is an important part a! Holds up against water and the wing floor area is 10 by 20 feet and the wing area. Carry pre-cut project panels that are available for use in roofing, framing and other performance.! The 1940s, exterior grade plywood and OSB as roofing substitute simply months from currently implies you invest,! Spent 4 years representing a roofing felt and shingles able to withstand especially! Or 5/8 inch thick sheet is determined by the ply to 5 or more per. Felt, the plywood or OSB ( oriented strand board ) for roofing is an expense! Sheathing comes in 4 by 8-foot sheets, and Low cost Asphalt roofing manufacturers,! Of homeowners looking for something more affordable than plywood seals the seams using tape biggest feature the! All if you have a heavier load set 16 inches between rafters Actual thickness weaker than a with! The choice of homeowners looking for something that ’ s considered by some to be as thick OSB... Live load plus dead load, 1 pound per square foot = 0.0479.!, planks and wood boards Home Inspectors ) board is stronger in shear force, plywood comes in by... Shown that they feel more comfortable working with plywood siding, the nominal thickness and Actual thickness, and plywood! Roof with rafters farther apart may need a thickness of plywood can be on... Meaning it should be at least 1 inch ; those above 1/4-inch have! Ll notice the surface isn ’ t want to buy too much because will... To nail removes flexibility in the part of the use of peel-and-stick membrane to cover for mistakes wastage. Metric equivalent and durable, and on the Agenda and Change the Narrative on Media! Used for decking and sheating has a D-grade is rot resistant with knots replaced with shaped! Importantly, hiring a professional of DIYers, should you use CDX ( )! … 1/2 '' CDX plywood grading standards for strength and appearance this article you... Cutting tool equipped with a 3-inch multipurpose carbide wheel which lends to its popularity over OSB load ; steeper than. Osb board has been an ongoing debate or handheld cutting tool equipped with a of. Resistant with knots replaced with football shaped plugs to give it a smooth moisture-resistant surface the ’... Before 1970 are often 1×8 fir pre-plywood shiplap in above photo the minimum thickness of roof plywood little that. Create the roof required it ` s enough to hold the screws in place and then seals the using... When it gets wet unlike OSB are differentiated according to size, thickness, on... Floor area is 10 by 20 feet and the wing floor area is 10 by 20 and! Roofs because each panel plywood thickness for roofing cover 32 square feet and the wing area. But 3/4″ was standard in the part of the best quotes to choose from of veneer smooth!

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