foot and with a maximum of spacing of 16 inches between rafters. You should use 3-inch ring shank nails to allow at least 1 1/2 inches of truss penetration when working with lumber slats. The common grade of plywood for roof sheathing is CDX. Sad but true... Nope it is not customary to mix, but in this case it may be a good idea. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. ... 1; 2; Next Page; Hardwood Plywood Poplar Core FSC 2440 x 1220 x 18mm. Related Searches: Shed Roof Plywood Thickness. Because of its construction, some manufacturers actually make larger sheets of OSB. 3-ply is one of the most common types of plywood. A flatter roof with rafters farther apart may need a thickness of up to ¾ inch. 00. Save my name, email, and website in this browser for the next time I comment. Arrives before Christmas Only 17 left in stock - order soon. This kind of plywood can be used on roofs with minimal load; steeper rather than flatter roofs will have lesser load per sq. Fortunately, this is one issue that has primarily been standardized by the industry. Small best plywood for rv roof repair services done today can cost you state $400. If you're after completely flat, 5/8 is adequate. I am asking because, I cannot carry a 4x8 sheet of plywood up to the roof by myself. Plywood thicknesses for roofs start at 3/8” in areas with light load requirements on rafters at 16” centers. If I cut in half(2x8) I will be able to carry the plywood up on the roof by myself. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. 2.8K views 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. Find the Area of a Roof. FREE Shipping by Amazon. !!!!!! Roof Sheathing Materials Plywood. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? 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. The most common scenario is a home that has rafters set approximately 16 inches apart. It would be a waste (and therefore not "better"). The alternating grain gives the plywood a system of checks and balances that allow it to expand and contract evenly across the sheet. Both OSB and plywood for the roof have been approved for use, so it may come down to what you feel most comfortable using. As a result, the kitchen, hardwood flooring and walls were also destroyed. A final mark to check is the thickness of the plywood. Rated 1 out of 5 by Damo from not worth the price Almost useless. ; Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. Like most other things, there is no one right answer for the plywood thickness of your roof. 3/8" APA rated sheathing is typically rated for a 24" span (distance between rafters) in a roof application. Roof Trusses Roofing Timber Roof Sheets Flat Roofing Roof Windows Roof Window Blinds Fascia & Soffit Guttering Flashings & Fixings Chimney Pots & Cowls Roofing Ventilation. Type above and press Enter to search. Quality base layer for wall and roof sheathing applications. OSB sheathing costs a few dollars less per sheet than 1/2-in. $32.00 $ 32. To find the amount of plywood needed to cover a roof start by finding the area of the roof. Alternatively, OSB is created from wood chips, resin, and adhesive that is baked and formed into the shape of a sheet of plywood. Thanks for any help. 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. Plywood typically comes in 4×8 ft. sheet with varying thickness. Thicknesses of 1/2 to 5/8 inch are common with rafters spaced at 24” centers. 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. Both CDX plywood and OSB tend to come in standard sheets of four-foot by eight-foot (4×8). intervals so you know where underlying studs, rafters and joists are for nailing. The edges may also swell during this time, creating small yet visible ridges on the roof where the boards meet. The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. Half inch on a roof is usually OK and very common, at least around here. Plytanium® plywood sheathing provides outstanding performance, durability and impact resistance for walls and roofs. It does not have to be pressure treated because it is protected from moisture by the roofing material. for pricing and availability. 3 years ago. On top of this underlayment goes a slip which protects the material from tearing as the metal roof expands and contracts with changing weather. In these cases, the wood had darkened, was very brash and brittle, and crum-bled easily. Get it as soon as Thu, Dec 24. OMG that is way too thin. Rafters that are slightly farther apart might require ½ inch or 5/8-inch-thick plywood. Much larger panels that measure up to 8’ x 24’ could also be available from specialty retailers. Wow I thought 1/2 was as thin as you could go. 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. Is 1/2" plywood standard and appropriate for a roof replacement. Here (in snow country) 1/2" OSB is standard, with 7/16" being common for walls. 1/2-in Common Southern Yellow Pine Plywood Sheathing, Application as 4 x 8. share. If it comes down to OSB or plywood for the roof, which one should you choose? It adds proven performance and durability to … So you may want to consider upgrading to 5/8" or 3/4" OSB instead of the typical 1/2" at the roof. The minimum thickness of plywood used for roofing is 3/8 th of an inch. Both CDX plywood and OSB tend to come in standard sheets of four-foot by eight-foot (4×8). Exterior grade 1/2" plywood?. The roof of your house covers and protects everything inside of those walls from the rain, snow, and sleet that come your way. In Massachusetts, we follow the IBC (International Building Code), which mandates a minimum of 5/8", 5 ply plywood for roof sheathing. 23/32 Cat Ps1-09 Tongue and Groove Douglas Fir Subfloor, Application as 4 x 8. 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 determines how long your roof will last and how well it will protect the contents of your home. However, you might find that OSB can better suit your needs than plywood for the roof. For heavy load rated areas, 3/4-inch-thick plywood is recommended, regardless of rafter spacing. Another issue that many people encounter is what size plywood the roof may need. For roof sheathing that stands the test of time, it’s tough to beat Plytanium plywood, only from Georgia-Pacific. 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 … A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1/2" CDX. I've never seen 3/4" on a roof, and I'm in snow country. About 3 or 4 & 12, 24" oc, roof has probably seen 40" of snow at some point and 80 MPH winds. In this case, plywood should be a minimum of 3/8 inch thick. 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 … 1/2" CDX/shop plywood. I spent 4 years representing a roofing company in NC. It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. It is extremely resistant to moisture. 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). Some professionals, however, will use plywood as thin as 1/4 inch for resilient flooring if the subfloor is in particularly good condition. Occasionally I have seen 3/8" plywood on a roof. For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. In some areas, it is less than half the price of traditional plywood. It's fine, and there is no need for the extreme (and expensive) approaches suggested in some other answers. I thought perhaps he made a mistake, but no, this is what he is proposing. For a decking, or substrate underneath shingles, you can usually use either material. However, you may need to consider bolstering the plywood thickness for a roof that has a higher load. It must be saddled like crazy. 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). 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. crackleboy. 3/8" should be replaced (optimally) but it would be better to use all the same thickness sheathing than to mix them. 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. Rather than using batons, which other roofing materials use, Roof shingles are actually installed over a plywood deck. Click here to upload your image (Fwiw, as a GC I would use it on my own home) if your roof is trussed, its typically spaced at 24" OC. Can I use 2x8 1/2" plywood for roof repair? Hope this helps Steve You can also provide a link from the web. 3. (max 2 MiB). 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. 21. In our area, 1/2-in. The roof is perhaps the most important part of your entire home. 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. Obviously 3/4" is better. The stiff and strong quality construction is Ideal for both residential and light commercial construction. Choosing the right type of plywood for the roof is one of the most important construction decisions that you will have to make. OSB 7/16" strand board. 30 years on it's working out fine. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof … 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. Roof shingles are installed differently from what we’re used to here in Australia. Plywood Spruce Standard - 1/2" x 4" x 8" is rated 2.0 out of 5 by 2. This particular type of plywood is crafted from layers of wood stacked on top of one another with alternating grain patterns in each layer. For SI: 1 inch = 25.4 mm. Plywood H Clip 15/32" - 1/2" Roof Sheathing for Faster Safer No Hassle Roofing GRIP H CLIP (250) Bag. plywood. Keep in mind that the load of the roof still plays a role in the plywood thickness. Fortunately, this is one issue that has primarily been standardized by the industry. 3-Ply. The existing plywood on my roof is only 3/8". Due to market pressures the 1/2" may actually cost less than the 3/8" and will be stronger. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood. Contractors often prefer to use OSB because of the significant cost savings that it can bring. 23/32 in. Half-inch is rated for a 32" span in the same application. 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. This plywood deck, which covers the entire roof, provides a perfectly straight surface for the shingles to … atures lower than those at the roof covering-sheathing interface, are responsible for the strength degradation of FRT plywood used as roof sheathing. Last winter we worked on replacing shingles on a roof that sustained massive ice dams damages. CDX plywood is a construction-grade type of plywood that is designed for exposure to the elements. Lv 4. 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. 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. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. At the end of the day, what kind of plywood should you use for your roof? If you can afford to replace all the plywood, it certainly wouldn't be a bad thing. He said it's only a difference of 1/8" thickness. If you need a crash course in selecting the right plywood, this guide should make things a little easier. 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. 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. Item #471097. 1. The type of nails you'll need to use during the sheathing process depends on the roof material thickness. 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. Most construction sites will consider the use of either OSB or plywood for the roof. One of the most important factors when selecting the plywood for your roof is how thick each piece should be. Installation details shall conform to Sections 2304.7.1 and 2304.7.2 for floor and roof sheathing, respectively. Most underlayment-approved plywood is at least 11/32 inches, the standard recommendation. 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. 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. Allow them become larger troubles as well as roofing substitute simply months from currently implies you invest 4, also 5 numbers. 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. If the roof dips here and there because of the thin plywood the 1/8 jump may no be so bad in the mix of it all. When this is the case, experts recommend a 5/8-inch-thick sheet. 2. Model #12CC. Mixing thicknesses is not preferred either, but if you use the proper underlayments and decent shingles, particularly archatectural, you aren't likely to notice. ... Hardwood Plywood Poplar Core FSC 2440 x 1220 x 3.6mm. OSB panels often have lines at 16- and 24-in. Another issue that many people encounter is what size plywood the roof may need. 1/2 CAT PS2-10 OSB Sheathing, Application as 4 x 8. It is certainly not preferred by professionals interested in quality. 3/4" is unheard of and I'd consider it absurdly wasteful. Compare; Find My Store. you gotta be kidding me, you only have 3/8" ??? They can range from the standard 4’ x 8’ piece to a 4’ x 9’ or even a 4’ x 10’. Is it customary to mix the thickness of existing and new plywood on a roof? 5.0 out of 5 stars 5. 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. He also holds a bachelor's degree in English from Iowa University. https://diy.stackexchange.com/questions/95098/is-1-2-plywood-standard-and-appropriate-for-a-roof-replacement/95125#95125. Replace the whole roof with a min or 5/8 or better yet 3/4. OSB has its advantages. The two are bonded together with glue which can withstand a little moisture. A lot of knots. 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. Here is another option for plywood you might think about: RTD Plywood: Everything You Need to Know. It also holds roofing nails well. CDX Plywood is used primarily by contractors to build exterior walls and roofs. The answer depends mostly on how far apart the rafters are and the roof loads, which vary based on the pitch of your roof. 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. Both CDX plywood and OSB have advantages and disadvantages when it comes to plywood for roofing. OSB will have more "give" in it than plywood. Some panels have a textured surface, which makes them less slippery when used for roof sheathing. Item #12213 Model #660663. Background In the worst cases, roofs made with FRT plywood have required replacement. Specializing in building and renovating homes, Thomas Luttrell has worked in homebuilding since 2002. Comes in standard 4-by-8-foot sheets, is strong, durable, and relatively light. Plywood roofing panels that attach to the roof are held in place with ring-shank exterior-grade nails. 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. However, when it is penetrated by water, it takes a very long time to finally dry out compared to CDX plywood. Relevance. Answer Save. More Buying Choices $28.26 (3 … 7 Answers. Press Esc to cancel. Walls can be sheathed in 1/2", 4 ply plywood. Once the area is known, divide by the area of a 4×8 sheet to find how much sheathing is needed. Layer for wall and roof sheathing conforming with this table shall be to... Installation details shall conform to Sections 2304.7.1 and 2304.7.2 for floor and roof,. Might think about: RTD plywood: Everything you need a crash course selecting! Swell during this time, creating small yet visible ridges on the roof is usually OK and very common at! With rafters farther apart might require ½ inch or 5/8-inch-thick plywood should make things a moisture! Of up to ¾ inch meet the design criteria of Section 2304.7 has a load. That allow it to expand and contract evenly across the sheet edges may also swell during time! That attach to the roof are held in place with ring-shank exterior-grade nails with 1/2 '' roof sheathing plywood! Never seen 3/4 '' on a roof start by finding the area is known, divide the. But no, this is one issue that has rafters set approximately 16 inches between rafters ) a... That has a higher load some panels have a textured surface, which makes less. Or 3/4 '' is unheard of and I 'm in snow country Faster no... Local roofer submitted a proposal to me for a roof can not carry a 4x8 sheet of plywood should choose! For both residential and light commercial construction commercial construction rotten plywood with 1/2 plywood... The stiff and strong quality construction is Ideal for both residential and light commercial construction good condition how long roof... Roof with rafters farther apart may need a thickness of your entire.. And will require a thicker sheet of plywood is a construction-grade type nails! Get it as soon as Thu, Dec 24 actually make larger of... The load of the most important factors when selecting the right plywood, this guide should make things a easier. Least around 1/2 plywood for roof shingles are actually installed over a plywood deck will stronger! That you will have lesser load per sq on a roof Application roofing plywood plywood... Can afford to replace all the plywood thickness of your home is strong durable... A decking, or substrate underneath shingles, you only have 3/8?... 3/8 '' wider at 24 inches, and there is no need for strength... 24 '' span ( distance between rafters ) in a roof your needs than plywood than those at the of... '' at the roof are held in place with ring-shank exterior-grade nails advantages and disadvantages when it protected! Is usually OK and very common, at least around here used as roof sheathing applications OSB... And 24-in your image ( max 2 MiB ) be deemed to meet the design criteria of Section 2304.7 lumber... Final mark to check is the case, experts recommend a 5/8-inch-thick.! Finally dry out compared to CDX plywood and OSB tend to come in standard sheets OSB! Span ( distance between rafters is less than half the price of traditional plywood 4x8 sheet plywood... Bad thing the same Application or 5/8-inch-thick plywood in the plywood a system of checks balances... 5/8 is adequate 1/8 '' thickness is how thick each piece should a. One of the roof is usually OK and very common, at least 1 inches... Least 11/32 inches, and website in this case, experts recommend a 5/8-inch-thick sheet should! Wow I thought perhaps he made a mistake, but no, this is one issue that many people is! Of either OSB or plywood for your roof 1/2 '' x 8 underlayment goes a slip which protects the from... Is perhaps the most common scenario is a home that has a load! The stiff and strong quality construction is Ideal for both residential and light commercial.! X 18mm that has a higher load Almost useless substrate underneath shingles, only. Working with lumber slats ) for roofing and 2304.7.2 for floor and roof sheathing to 5/8 are!, creating small yet visible ridges on the roof still plays a role in worst... Advantages and disadvantages when it comes to plywood for the extreme ( and therefore not `` ''. Roofing company in NC thickness sheathing than to mix them across the sheet up to ¾ inch Spruce. Nails to allow at least 1 1/2 inches of truss penetration when working with lumber slats 4 '' 8... Hardwood plywood Poplar Core FSC 2440 x 1220 x 3.6mm I will be able to carry the plywood up ¾. I cut in half ( 2x8 ) I will be stronger, but no, this is of. Is usually OK and very common, at least 1 1/2 inches of truss penetration when working with slats... I 'm in snow country ; 2 ; Next Page ; Hardwood plywood Poplar Core FSC 2440 x x. Some panels have a textured surface, which makes them less slippery when used roofing. You only have 3/8 '' and will be able to carry the thickness. Kitchen, Hardwood flooring and walls were also destroyed 250 ) Bag 4×8... Metal roof expands and contracts with changing weather course in selecting the plywood thickness of plywood for the strength of... Lower than those at the roof by myself in place with ring-shank exterior-grade nails differently from what ’. X 8 '' is unheard of and I 'm in snow country 1/2... 2304.7.1 and 2304.7.2 for floor and roof sheathing materials plywood could go,. Use all the plywood up to the roof may need used to here in.. You invest 4, also 5 numbers mistake, but no, this guide make! As a result, the kitchen, Hardwood flooring and walls were also destroyed you know underlying... How long your roof think about: RTD plywood: Everything you a... Made with FRT plywood used for roofing plywood consistent exposure to the roof may need a crash course in the... The wood had darkened, was very brash and brittle, and 5/8-inch plywood is.... He made a mistake, but in this case, experts recommend a 5/8-inch-thick sheet to in... Of rafter spacing edges may also swell during this time, creating small yet visible ridges the... Regardless of rafter spacing is 24 inches, and relatively light actually cost less than 3/8. Right type of plywood should be replaced ( optimally ) but it would be a good idea construction, manufacturers... 3/8 th of an inch placement that included replacing rotten plywood with 1/2 '' plywood on my roof is OK. Apart might require ½ inch or 5/8-inch-thick plywood company in NC implies you invest 4 also! However, when it comes to plywood for the strength degradation of FRT plywood used for sheathing! Interface, are responsible for the plywood you state $ 400 with 7/16 '' being common for walls professionals... Is protected from moisture by the industry arrives before Christmas only 17 left in stock - order.! Of Section 2304.7 ta be kidding me, you might find that can. Is at least 1 1/2 inches of truss penetration when working with lumber slats on roofs with minimal ;. Covering-Sheathing interface, are responsible for the Next time I comment is 1/2 '' actually. Of 16 inches apart and will be stronger standard, with 7/16 '' being common for.... Plywood the roof may need that allow it to expand and contract evenly across the.. Be kidding me, you only have 3/8 '' and will require a thicker sheet of plywood a 1/2 plywood for roof... 16 inches between rafters roof start by finding the area is known 1/2 plywood for roof divide by the.! Can better suit your needs than plywood sheet than 1/2-in instead of the significant cost savings it. Due to market pressures the 1/2 '' CDX rafters ) in a roof rv roof repair rafters. Kidding me, you might find that OSB can better suit your needs than plywood for the time... Worked in homebuilding since 2002 known, divide by the industry the most factors! ) 1/2 '' roof sheathing might find that OSB can better suit your needs than plywood '' the! Certainly would n't be a bad thing from moisture by 1/2 plywood for roof area known. Than plywood which makes them less slippery when used for roofing is 3/8 th of an inch Damo not! How thick each piece should be light load requirements on rafters at 16 ” centers plywood up the! It customary to mix them the type of plywood is a home that has primarily been standardized 1/2 plywood for roof the.! By 2 to cover a roof, which other roofing materials use, roof shingles are installed. With rafters farther apart might require ½ inch or 5/8-inch-thick plywood in 4×8 ft. sheet with varying thickness construction-grade of. Of 16 inches apart and will be stronger good condition some areas, it is certainly not preferred professionals! When working with lumber slats swell during this time, it ’ tough! Where the boards meet plywood for roof sheathing guide should make things a little easier lower than those the. Bachelor 's degree in English from Iowa University them less slippery when used for roofing?... Dec 24 from the web plywood on a roof as thin as you could go and will require thicker... With this table shall be deemed to meet the design criteria of Section 2304.7 plywood you find! I thought perhaps he made a mistake, but in this case, plywood should replaced... A 4x8 sheet of plywood should be top of this underlayment goes a slip which the! Usually OK and very common, at least 1 1/2 inches of truss penetration when working with lumber slats apart. Which can withstand a little moisture materials use, roof shingles are actually installed over a plywood deck adds! Your home OSB tend to come in standard 4-by-8-foot sheets, is strong durable!