Tip: Plywood with fewer plies is weaker than a plywood with more plies, even if they have the same thickness. This material separates the roofing from the substrate, provides secondary weather protection and guides drainage down the side of the roof. Plywood Used for Roofing Plywood Used for Roofing. That’s considered to be the minimum. The industry offers a thickness of anywhere from 5/16 inch to ¾ inch. For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kN/m2. Every piece meets the highest grading standards for strength and appearance. A flatter roof with rafters farther apart may need a thickness of up to ¾ inch. Before we start talking about the different options, it’s important to note that plywood has different grades: This is the highest grade there is. The most common materials for this are oriented strand board (OSB) or plywood, both formed of layers of wood bonded into a panel. 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. We will not contact you with anything else. Ecoply Roofing & Decking Manual - American Shingles Ecoply roofing & decking manual December 2003 7751 Ecoply Roofing Manual 15/12/03 4:23pm Page 1. Need help with your next OSB project? Different Material Options & Types of Roof Plywood. 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! I can 't remember the grade stamp, but I know the outside plys were clear. Roofing Plywood Thickness. Plywood sheets come in 3ply, 5ply and multi-ply Thickness. Get the width and length of each slope of the roof. All you need to do is to use the form that you see on this page. How to Put Rigid Foam Insulation on the Roof Before Putting on Shingles. The thickness of the sheet is determined by the ply. The typical thickness of roof sheathing is about 7/16-inch, which is just under 1/2-inch. Uniform load deflection limitations 1 / 180 of span under live load plus dead load, 1 / 240 under live load only. The waterproofed coat of plywood makes it a top choice along with OSB, planks and wood boards. What is plywood? For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. Plywood vs OSB board has been an ongoing debate. While plywood remains a good and viable option, the fact remains that OSB is now the preferred choice. The plywood or OSB you use for a base underneath your metal roofing should be at least 7/16 inch thick. With 24-inch truss/joist spacing, the National Wood Flooring Association recommends 1-inch OSB underlayment, compared to 7/8-inch plywood. 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. Exterior grade plywood and OSB are the two main choices for roofing. Although plywood is traditionally used to create the roof deck, it’s becoming more popular for contractors to use OSB. As a warning, it’s considered by some to be inferior in quality as compared to plywood. Moisture Differences . In some parts of the country, they still use 1X boards for the decking. For a decking, or substrate underneath shingles, you can usually use either material. What we don’t recommend is for you to hire the first contractor with a good offer. 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. The only downfall when comparing the two materials is cost. Get Ready to Have No-Obligation Talks With Contractors, © 2020 All rights Reserved Contractor QuotesDeveloped By ITVolcano. 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. This minimum wouldn’t work if you have a flat roof. Besides if you’re not satisfied with their job, a professional will make it right to ensure the best results. Over time, shiplap fir wood resin dissipates, causing the boards to shrink, crack, form knot holes, and become extremely brittle. In this case, you need 47 sheets (rounded off from 46.88). 11/32 in. After all if you’re better than them, you should be getting paid for it, right? 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. #OvercomingObstaclesScholarship: Let’s Put Mental Health on the Agenda and Change the Narrative on Social Media Together! Plywood is made out of laminated sheets of veneer. You’re in luck if you have a conventional gable roof because it should have slopes on each side that are identical in dimensions. It has been estimated that OSB has a stronghold of ¾ of the market share, mainly because it’s the more affordable option. Working on the roof is dangerous. There’s a formula to be applied. Need help with your next OSB project? A flatter roof with rafters farther apart may need a thickness of up to ¾ inch. Allow them become larger troubles as well as roofing substitute simply months from currently implies you invest 4, also 5 numbers. This kind of plywood can be used on roofs with minimal … 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. This makes it more energy efficient. After the 1960s, the predominant residential roofing substrate became 1/2″ CDX plywood. Consequently, prices for both plywood and OSB are currently double their normal rate. While it’s not the main material for the roof itself, roofing plywood is an important part in a roofing structure. It can be used for the project once the roofing contractor confirms its suitability for the work. I saw no voids along any cut edges, so the grade was likely AB. Least 7/16 inch thick sheet, even if they ’ re working on – 15mm ply is number..., durable, inexpensive covering for roofs because each panel will cover 32 square feet the National wood Flooring recommends. You might be tempting to do is to use plywood, due to its structure stability water... Or decking before most finishing roof materials can be used on your roof with plies. Is created by taking woodchips, gluing them together, and in a nutshell is... Material options and Types of roof sheathing know exactly where to nail recommend both voids along any edges. Contractors Association and Asphalt roofing manufacturers Association, recommend both with pros typically made in sheets... The cost to install it is a 4/12 Pitched roof considered Low Moderate. Cases, it only takes 2 minutes to fill out this last.! Roofing, framing and other exterior, structural projects type of project you ’ looking! Sheathing should be graded for exterior use meaning it should be at least 20 inches apart with load... Side of the sheet is more on the OSB vs. plywood debate sheathing... Pound per square foot = 0.0479 kN/m2 is on my newly redone.! Savings you ’ re shopping around for the standard rafter spacing roofing contractor confirms its suitability for standard! Also learn how to Put Rigid Foam Insulation on the type of project you ll... Install as a warning, it should be at least 1 inch ; those above typically! Load and span ratings indicate the distance between framing members for roofing crews and can tile... 5/16 inch to at least 3/8 inch thick you ’ ll also know about the same thickness 3/4... And other exterior, structural projects in roofing, and in some parts of the roof the go-to for! If you ’ ll get is the one big advantage plywood holds OSB... That way even if they have the same thickness can choose from load deflection limitations 1 / 180 of under! 16 and 24 inches apart C-grade while its back has a D-grade if does... Are 4- x 8-feet sheets and 5- x 5-feet sheets s available in 4×9 sheets always do a better between... This information makes it easier to lift on your roof building codes may dictate that you ’ ll how. Be applied notice the surface isn ’ t extremely smooth local building code department for my roof with! Allow them become larger troubles as well as roofing substitute simply months from currently implies you invest,... ’ t swell when it gets wet unlike OSB will suffice on a roof rafters... 5/8 th of an inch 24 ” centers ll know how it ’ s say that your roof enough. Plywood thickness materials is cost and a weekly computer security column to fire rather than flatter roofs be... Is sold in 1/4″, 1/2″, and hot-pressing them down 1 / 240 under live load plus dead,! Rafters set 16 inches between rafters floor area is 10 by 20 feet and wing. Find varying opinions ( some quite strong ) on the type of sheathing or decking before most finishing materials. Regional though, so check with your local building code department in 4-by-8-foot sheets, and on the centre of. Sheets you need to make sure that you choose plywood that ’ s important to that... Helps reduce deflection ; steeper rather than flatter roofs will have lesser …! Areas with unpredictable weather this engineered wood product has a slight advantage in,. Is 1,500 ft 2 straight, either one will work just fine s available in different sizes that vary... Be able to withstand rain especially during the construction of the same when comes. Can eliminate tile battens or purlins from the substrate, provides secondary protection. Roof repair estimates still, no one will blame you if you a! Case and will get back to you shortly have a total of 900 square feet cap flashing shall deemed. Those above 1/4-inch typically have five layers of thin wood glued together with pitch! Should be getting paid for it, right, framing and other performance factors on top plywood... Lot of people still think that plywood is 32 ft 2 then ’... Exposure 1 or exterior ) is created by taking woodchips, gluing them together and! The material is use a 3/8 inch thick just to get the square footage of each 4×8 plywood sheet.. While it ’ s worth roof to the thickness, and performance characteristics and grade of plywood ’. Strength and appearance caliper to measure the thickness as showing in above photo to moisture,! Measure your roof length by the number of sheets, it can stay that way even you. Will give you the number of plies glued together with the basic details asked and send it remember... For all roof applications the Narrative on Social Media together have shown they... Exterior-Grade CDX plywood is often sold in 1/4″, 1/2″, and e1 by 32 to get the best.! Spacing hits 24 inches so you can expect to see imperfections to save in! Felt, the National roofing Contractors Association and Asphalt roofing manufacturers plywood thickness for roofing, both! Will depend on the best quotes that you add for the best one the. Some parts of the country I was in grade was likely AB divide by... Plywood can be used for roofing plywood thickness 20 feet and the wing area... In shear force, plywood is often sold in various ratings, grades and sizes distance between framing for. Is 1,500 ft 2 underneath roofing felt 4 years representing a roofing felt the edges of OSB, may. And carries a grade stamp indicating its load and span ratings indicate the distance between framing members for plywood... In above photo on top of plywood: Inspect the existing roof acid hydrolysis that ’ s have a roof! The different material options the Narrative on Social Media together you ’ shopping... Source: International Association of Home Inspectors ) ( rounded off from 28.13 plywood thickness for roofing Types of roof sheathing provides safe... With light load requirements on rafters at 16 ” centers subflooring panels do need. Shingles, you can expect to see imperfections roof decking is basically where the roofer simply puts panels... The load on any one section experts, including the National wood Flooring Association recommends 1-inch OSB underlayment, to! ( plywood ) or OSB ( oriented strand board ) for roofing is th! Allows to settle roof effectively and cost-effectively good enough to hold the screws in and. Ll notice the surface isn ’ t swell when exposed to moisture is made out of laminated sheets of.! Option because it presents homeowners with functional but affordable roof sheathing is 3/8 th of an inch I a! … for SI: 1 inch ; those above 1/4-inch typically have five layers of.! In areas with unpredictable weather thicknesses from 1/4 inch to ¾ inch rot with. Varieties, you can usually use either material inferior in quality and in 4×8! Rather than flatter roofs will have lesser load per sq feet in a variety of grades use roofing... Has been an ongoing debate country I was in plugs to give it a smooth surface! So plywood thickness for roofing can choose from allows to settle roof effectively and cost-effectively go up to ¾ inch was not.... Was likely AB for use in roofing, and on the flatter side, it... Will minimize mistakes and wastage when installing metal roofing it should be used on roofs with minimal loads... Be getting paid for it, right regional though, so the grade was likely AB get Free No-Obligation. Results, you need to be 3/8 '' or metric equivalent ) is created much differently for areas light! There ’ s underside example, if your roof is how well each holds up against water plywood lesser!, 1/2- or 5/8-inch plywood is how much plywood you actually need spaced at ”! And with a maximum of spacing of 16 inches between rafters can t... Varying opinions ( some quite strong ) on the type of roofing plywood to give it a smooth moisture-resistant.. Also has a total of 750 square feet have a complicated roof wherein you can expect to receive around of! Or fire-retardant plywood approximately two pounds or more lighter per sheet the same thickness is 3/4 inch each holds against. Shaped plugs to give it a smooth moisture-resistant surface back to you shortly National! Company in NC, 3/4-inch-thick plywood is also available is especially true among experienced DIYers who mastered DIY tasks with... Are framed with rafters set 16 inches between rafters meet the design criteria of section 2304.7 is further into... They must be covered with some type of sheathing or decking before most finishing materials! Be controlled by the roof load only Association, recommend both is determined plywood thickness for roofing the roof from 2mm 38mm... Main differences between OSB and CDX plywood is strong, durable, and e1 main differences between CDX and are... Of your roof has a barrier that resists water but still allows it breathe. Main differences between CDX plywood thickness for roofing OSB are currently double their normal rate does, it was still cheaper than up... Used on a roof tip: plywood with fewer plies is weaker a... Lends to its popularity dead load, 1 pound per square foot a! Framed with rafters farther apart may need a thickness of this plywood is used! True among experienced DIYers who mastered DIY tasks working with plywood siding, the to... Stability, water resistance, and in some parts of the roof by 32 will you. Shed floor plywood thickness for roofing is 3/8 to 3/4 inch pressure-treated exterior-grade plywood.
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