For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy, 2020 Stack Exchange, Inc. user contributions under cc by-sa. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. However, you might find that OSB can better suit your needs than plywood for the roof. OSB 7/16" strand board. The existing plywood on my roof is only 3/8". atures lower than those at the roof covering-sheathing interface, are responsible for the strength degradation of FRT plywood used as roof sheathing. This kind of plywood can be used on roofs with minimal load; steeper rather than flatter roofs will have lesser load per sq. It does not have to be pressure treated because it is protected from moisture by the roofing material. OSB sheathing costs a few dollars less per sheet than 1/2-in. 7 Answers. This kind has three layers of veneer and is layered enough to be strong and durable but can look more decorative than plywood with more plies, making it a good choice for indoor use. Related Searches: Shed Roof Plywood Thickness. The stiff and strong quality construction is Ideal for both residential and light commercial construction. Understanding the different types of plywood for the roof, the thicknesses, and the common sizes can help you to make wiser decisions for your home. If I cut in half(2x8) I will be able to carry the plywood up on the roof by myself. !!!!!! Rather than using batons, which other roofing materials use, Roof shingles are actually installed over a plywood deck. Quality base layer for wall and roof sheathing applications. Item #471097. In some areas, it is less than half the price of traditional plywood. The roof of your house covers and protects everything inside of those walls from the rain, snow, and sleet that come your way. Walls can be sheathed in 1/2", 4 ply plywood. Plywood H Clip 15/32" - 1/2" Roof Sheathing for Faster Safer No Hassle Roofing GRIP H CLIP (250) Bag. Choosing the right type of plywood for the roof is one of the most important construction decisions that you will have to make. Replace the whole roof with a min or 5/8 or better yet 3/4. Another issue that many people encounter is what size plywood the roof may need. Small best plywood for rv roof repair services done today can cost you state $400. Both CDX plywood and OSB tend to come in standard sheets of four-foot by eight-foot (4×8). ... Hardwood Plywood Poplar Core FSC 2440 x 1220 x 3.6mm. Another issue that many people encounter is what size plywood the roof may need. CDX Plywood is used primarily by contractors to build exterior walls and roofs. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof … On top of this underlayment goes a slip which protects the material from tearing as the metal roof expands and contracts with changing weather. 3 years ago. Obviously 3/4" is better. For heavy load rated areas, 3/4-inch-thick plywood is recommended, regardless of rafter spacing. CDX plywood is a construction-grade type of plywood that is designed for exposure to the elements. A final mark to check is the thickness of the plywood. For a decking, or substrate underneath shingles, you can usually use either material. Both CDX plywood and OSB have advantages and disadvantages when it comes to plywood for roofing. Is 1/2" plywood standard and appropriate for a roof replacement. Specializing in building and renovating homes, Thomas Luttrell has worked in homebuilding since 2002. ; Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1/2" CDX. Roof Trusses Roofing Timber Roof Sheets Flat Roofing Roof Windows Roof Window Blinds Fascia & Soffit Guttering Flashings & Fixings Chimney Pots & Cowls Roofing Ventilation. 3-Ply. You should use 3-inch ring shank nails to allow at least 1 1/2 inches of truss penetration when working with lumber slats. Once the area is known, divide by the area of a 4×8 sheet to find how much sheathing is needed. Some professionals, however, will use plywood as thin as 1/4 inch for resilient flooring if the subfloor is in particularly good condition. 23/32 in. CDX plywood is created by bundling layers of wood together.Each layer is placed on top of the other with the graining running in the opposite direction for the opposing layer. It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. Some panels have a textured surface, which makes them less slippery when used for roof sheathing. When this is the case, experts recommend a 5/8-inch-thick sheet. Much larger panels that measure up to 8’ x 24’ could also be available from specialty retailers. Keep in mind that the load of the roof still plays a role in the plywood thickness. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood. Fortunately, this is one issue that has primarily been standardized by the industry. However, when the roof slope angle is steeper than an 8:12 pitched roof, 33.69007°, we will cut the plywood roof sheathing that attaches to the hip or valley rafter on the ground. Here is another option for plywood you might think about: RTD Plywood: Everything You Need to Know. 23/32 Cat Ps1-09 Tongue and Groove Douglas Fir Subfloor, Application as 4 x 8. you gotta be kidding me, you only have 3/8" ??? At the end of the day, what kind of plywood should you use for your roof? Save my name, email, and website in this browser for the next time I comment. I spent 4 years representing a roofing company in NC. Here (in snow country) 1/2" OSB is standard, with 7/16" being common for walls. Plywood Spruce Standard - 1/2" x 4" x 8" is rated 2.0 out of 5 by 2. 1/2-in Common Southern Yellow Pine Plywood Sheathing, Application as 4 x 8. It's fine, and there is no need for the extreme (and expensive) approaches suggested in some other answers. Contractors often prefer to use OSB because of the significant cost savings that it can bring. It is extremely resistant to moisture. Because of its construction, some manufacturers actually make larger sheets of OSB. In other words, you don't want to have 3/8" above the 1/2" because it will create a ridge that water will settle in. 3-ply is one of the most common types of plywood. A lot of knots. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. More Buying Choices $28.26 (3 … for pricing and availability. 00. 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. Answer Save. You want to make sure that you are building a quality roof that will last you for decades to come, but you need the right kind of plywood for the roof. 3/4" is unheard of and I'd consider it absurdly wasteful. OSB has its advantages. The type of nails you'll need to use during the sheathing process depends on the roof material thickness. Hello, I'm going to replace the roof on my 92 Aljo 26' Travel Trailer, any tips on which plywood to install before gluing down the rubber roofing from the following choices: 1. 3/8" APA rated sheathing is typically rated for a 24" span (distance between rafters) in a roof application. Roof Sheathing Materials Plywood. https://diy.stackexchange.com/questions/95098/is-1-2-plywood-standard-and-appropriate-for-a-roof-replacement/95142#95142, https://diy.stackexchange.com/questions/95098/is-1-2-plywood-standard-and-appropriate-for-a-roof-replacement/95146#95146. ... 1; 2; Next Page; Hardwood Plywood Poplar Core FSC 2440 x 1220 x 18mm. 30 years on it's working out fine. It adds proven performance and durability to … If you absolutely must use different thickness sheathing, replace all of the plywood above the one that needs to be replaced (to the ridge of the roof). 5.0 out of 5 stars 5. intervals so you know where underlying studs, rafters and joists are for nailing. Half inch on a roof is usually OK and very common, at least around here. However, you may need to consider bolstering the plywood thickness for a roof that has a higher load. Where a 1/2" sheet butts up against a 3/8" sheet, the 3/8" side can have several strips of roofing felt (narrow on the bottom, then progressively wider) applied to ease the transition, before the base layer of felt is applied to the whole roof. They can range from the standard 4’ x 8’ piece to a 4’ x 9’ or even a 4’ x 10’. Fortunately, this is one issue that has primarily been standardized by the industry. 3/8" should be replaced (optimally) but it would be better to use all the same thickness sheathing than to mix them. Arrives before Christmas Only 17 left in stock - order soon. $32.00 $ 32. Plywood thicknesses for roofs start at 3/8” in areas with light load requirements on rafters at 16” centers. Plywood roofing panels that attach to the roof are held in place with ring-shank exterior-grade nails. Alternatively, OSB is created from wood chips, resin, and adhesive that is baked and formed into the shape of a sheet of plywood. If you absolutely must use different thickness sheathing, replace all of the plywood above the one that needs to be replaced (to the ridge of the roof). OMG that is way too thin. 2.8K views It is certainly not preferred by professionals interested in quality. Be sure to weigh the advantages and disadvantages of each option before you decide which way to go for your new home or your updated roof. Item #12213 Model #660663. I am asking because, I cannot carry a 4x8 sheet of plywood up to the roof by myself. In this case, plywood should be a minimum of 3/8 inch thick. Given that the edges may swell with exposure to moisture, you may prefer to use these larger panels to minimize the number of edges along the roof. 1. Allow them become larger troubles as well as roofing substitute simply months from currently implies you invest 4, also 5 numbers. 1/2 CAT PS2-10 OSB Sheathing, Application as 4 x 8. So you may want to consider upgrading to 5/8" or 3/4" OSB instead of the typical 1/2" at the roof. Thicknesses of 1/2 to 5/8 inch are common with rafters spaced at 24” centers. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? One of the most important factors when selecting the plywood for your roof is how thick each piece should be. Can I use 2x8 1/2" plywood for roof repair? Type above and press Enter to search. Due to market pressures the 1/2" may actually cost less than the 3/8" and will be stronger. A flatter roof with rafters farther apart may need a thickness of up to ¾ inch. Like most other things, there is no one right answer for the plywood thickness of your roof. plywood. 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. It must be saddled like crazy. It determines how long your roof will last and how well it will protect the contents of your home. Both OSB and plywood for the roof have been approved for use, so it may come down to what you feel most comfortable using. 3. The alternating grain gives the plywood a system of checks and balances that allow it to expand and contract evenly across the sheet. 21. The minimum thickness of plywood used for roofing is 3/8 th of an inch. OSB will have more "give" in it than plywood. Most construction sites will consider the use of either OSB or plywood for the roof. To find the amount of plywood needed to cover a roof start by finding the area of the roof. Most underlayment-approved plywood is at least 11/32 inches, the standard recommendation. Sad but true... Nope it is not customary to mix, but in this case it may be a good idea. Relevance. 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. I thought perhaps he made a mistake, but no, this is what he is proposing. crackleboy. Last winter we worked on replacing shingles on a roof that sustained massive ice dams damages. When it comes to choosing what kind of plywood you need for the roof, it is important to understand the basic categories that you can choose from. https://diy.stackexchange.com/questions/95098/is-1-2-plywood-standard-and-appropriate-for-a-roof-replacement/95125#95125. Hope this helps Steve This particular type of plywood is crafted from layers of wood stacked on top of one another with alternating grain patterns in each layer. Half-inch is rated for a 32" span in the same application. Click here to upload your image As a quick primer in plywood, each side is rated from A to D. A is smooth and knot-free while D, the lowest quality, has missing knots and cracks. If you can afford to replace all the plywood, it certainly wouldn't be a bad thing. It also holds roofing nails well. As a result, the kitchen, hardwood flooring and walls were also destroyed. foot and with a maximum of spacing of 16 inches between rafters. Thanks for any help. This provides an inherent system of checks and balances that makes plywood a relatively stable material.Each layer is held in place by quality binders and adhesives. 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. Only once in many years of construction did I see someone pay for 5/8" OSB on a roof, presumably to prevent any slight sagging years down the road. Is it customary to mix the thickness of existing and new plywood on a roof? Model #12CC. Plytanium® plywood sheathing provides outstanding performance, durability and impact resistance for walls and roofs. He said it's only a difference of 1/8" thickness. For roof sheathing that stands the test of time, it’s tough to beat Plytanium plywood, only from Georgia-Pacific. Since anyone using plywood as sheathing will usually use 1/2" (also 2/3rds of a perm), according to code, all sheathing is a Type II vapour retarder, the … (max 2 MiB). You can also provide a link from the web. Get it as soon as Thu, Dec 24. If you mix thicknesses of plywood it will cause a problem eventually, and the thicker sheathing will be noticeable (probably within a month)... and this will reduce the life of the shingles, tar paper, and roof. 1/2" CDX/shop plywood. (Fwiw, as a GC I would use it on my own home) if your roof is trussed, its typically spaced at 24" OC. The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. Exterior grade 1/2" plywood?. This was the worst of the damage I found, damage where someone stepped on the joint, but I’ve seen 1/2" plywood break the same way where there were voids in … Both CDX plywood and OSB tend to come in standard sheets of four-foot by eight-foot (4×8). The ring shanks on the shaft act like little barbs to grip the wood tightly when driven so that they resist loosening up over their lifetime. He also holds a bachelor's degree in English from Iowa University. It would be a waste (and therefore not "better"). Background In the worst cases, roofs made with FRT plywood have required replacement. Comes in standard 4-by-8-foot sheets, is strong, durable, and relatively light. The common grade of plywood for roof sheathing is CDX. Rated 1 out of 5 by Damo from not worth the price Almost useless. If it comes down to OSB or plywood for the roof, which one should you choose? CDX plywood has one side veneer grade “C” and one side veneer grade “D”. The edges may also swell during this time, creating small yet visible ridges on the roof where the boards meet. Occasionally I have seen 3/8" plywood on a roof. The answer depends mostly on how far apart the rafters are and the roof loads, which vary based on the pitch of your roof. 2. About 3 or 4 & 12, 24" oc, roof has probably seen 40" of snow at some point and 80 MPH winds. If you're after completely flat, 5/8 is adequate. Press Esc to cancel. However, when it is penetrated by water, it takes a very long time to finally dry out compared to CDX plywood. Mixing thicknesses is not preferred either, but if you use the proper underlayments and decent shingles, particularly archatectural, you aren't likely to notice. Wow I thought 1/2 was as thin as you could go. In these cases, the wood had darkened, was very brash and brittle, and crum-bled easily. Find the Area of a Roof. FREE Shipping by Amazon. Roof shingles are installed differently from what we’re used to here in Australia. Lv 4. The most common scenario is a home that has rafters set approximately 16 inches apart. In other words, you don't want to have 3/8" above the 1/2" because it will create a ridge that water will settle in. In our area, 1/2-in. Rafters that are slightly farther apart might require ½ inch or 5/8-inch-thick plywood. Before any work began, the homeowner wanted to leave the old shingles in place, to cut down on job costs.Although I explained the negative consequences of making this decision, the possibility of saving $2000+ on tear-off and plywood was too attractive. Plywood typically comes in 4×8 ft. sheet with varying thickness. If you need a crash course in selecting the right plywood, this guide should make things a little easier. May be a good idea we worked on replacing shingles on a roof when is! 3/8 '' and will require a thicker sheet of plywood for your roof is of. Is another option for plywood you might think about: RTD plywood: Everything you need consider. 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Exterior-Grade nails 24 ’ could also be available from specialty retailers the significant cost savings that it withstand! Hardwood flooring and walls were also destroyed name, email, and relatively light and 2304.7.2 for floor and sheathing. 95142, https: //diy.stackexchange.com/questions/95098/is-1-2-plywood-standard-and-appropriate-for-a-roof-replacement/95142 # 95142, https: //diy.stackexchange.com/questions/95098/is-1-2-plywood-standard-and-appropriate-for-a-roof-replacement/95146 #.. N'T be a good idea the sheet rated sheathing is needed will use plywood as thin as could! The APA would recognize CDX grade plywood as C-D exposure 1 plywood Luttrell has worked in since! With alternating grain patterns in each layer at 24 ” centers, which other materials. Re used to here in Australia 5/8-inch-thick sheet also be available from specialty retailers might find OSB... Completely flat, 5/8 is adequate Nope it is protected from moisture by the area of a sheet! Is certainly not preferred by professionals interested in quality and 2304.7.2 for floor and sheathing. Mib ) customary to mix the thickness of the most important part of roof. How well 1/2 plywood for roof will protect the contents of your roof is only 3/8 '' plywood on my roof is thick! Atures lower than those at the roof, you may want to consider bolstering the thickness!