osb vs cdx

Second, you can think of CDX kind of like your grade of plywood. This is a very important step and the quality and type of material you use is crucial in preventing future damage! Cover it on both occasions and maintain it regularly to ensure it does not get damaged. ACX and CDX are both exterior plywoods and aren’t specifying the type of wood. CDX plywood is produced by gluing together sheets of veneer, with each layer being glued the opposite grain to the one below it. So if both products are equally strong and OSB is cheaper and comes in more convenient sizes, it seems like an easy choice, right? What is OSB? Question: Now that I know the best solution I’ll take up the OSB and put down 3/4″ plywood fastened with 3″ spiral nails. Sanded Pine: Sanded pine is a versatile plywood material. choose CDX, since OSD plywood is generally flat on one side and rough on the other. Because of its construction, some manufacturers actually make larger sheets of OSB. Because of this manufacturing process, OSB is at least half the cost of CDX … How do CDX and OSB differ in performance? Get Three bids, just make sure one of them is Valentine Roofing! It is made of multiple layers of thinly cut, solid sheets of wood that are pressed together. This prevent them from twisting and bending, provides a nailing base for your exterior finish, and gives a layer of protection against exterior elements. How We Built Our Home- Primarily With Our Own Hands, Even Though We Had No Experience Building A House: Part III- Instagram, How We Built Our Home- Primarily With Our Own Hands, Even Though We Had No Experience Building A House: Part II- Framing, How We Built Our Home – Primarily With Our Own Hands, Even Though We Had No Experience Building A House: Part I- Financing. We had so many torrential downpours over the past 6 months, if we had used OSB anywhere, we would be dealing with some major swelling issues right now. Plywood is produced by gluing together sheets of veneer, alternating the grain on each layer. On the other hand, OSB is produced very differently. Perhaps the biggest thing plywood has going for it is the perception of higher quality among homeowners. How do CDX and OSB differ in performance? Structure or Basic Composition. It is made of multiple layers of thinly cut, solid sheets of wood that are pressed together. In such places, it does not get in contact with a lot of moisture, which prevents it from getting damaged. Oriented strand board (OSB) combines wood chips, glue, and resin into the shape of a sheet of plywood and bakes them together. While most people only see the finished product and do not give much thought to the steps it took to make that completed house, making sure each step is done properly and with the best quality materials possible is essential in ensuring a well built home. Based on what I’ve read from others who put hardwood on any thickness OSB or had a new house with hardwood floors over OSB, you are […] OSB is a cheap imitation of CDX. OSB is more resistant to moisture since the glue that holds the strands together pretty much saturates the sheets. Come along as we share what inspires us as we design, build & decorate our modern farmhouse! OSB- Oriented Strand Board are made from logs that are ground into thin wood strands to produce oriented strandboard. So for us and our geographical location, plywood was an easy choice! The dried strands are positioned as alternating layers that run perpendicular to each other, then combined with wax and resin, and formed and baked into plywood type sheets. The sheets are generally 4 x 8 or 4 x 12 feet in size. OSB does not do well when it gets wet. Plywood vs. OSB (Oriented Strand Board): Major Differences . We used 5/8" CDX on one house and the same problems were apparent; the only advantage of the extra thickness was it felt stiffer underfoot. Plywood vs. OSB Protect an unfinished home from the elements—and a finished home from the consequences of plumbing disasters—by starting with a durable subfloor built from the right materials. The same is true when building home. The main difference between the two is how they handle moisture, and oddly enough there are wildly varying conclusions - from very reputable sources - as to just how vapour permeable they are. If this is your final finish, we’d recommend plywood over OSB every time. For instance, with 24-inch truss/joist spacings, the National Wood Flooring Association recommends nominal 1 inch OSB underlayment compared to 7/8 inch CDX plywood. While this is speaking to the fact that there is strength in numbers, I am going to argue that those three strand need to be the highest quality they can to make the cord as strong as possible. Both CDX plywood and OSB tend to come in standard sheets of four-foot by eight-foot (4×8). Osb and plywood are equals structurally, but flooring manufacturers make different recommendations regarding their use as a substrate. OSB is made of many smaller pieces of hardwood and softwood mixed together in strands. As a roofing contractor in Seattle, I strongly recommend that OSB is never used as a roofdeck. Though manufacturer’s claim they now coat the edges in water-resistant seals to prevent this, because boards are commonly cut to fit the structure, there are still exposed edges. ®. CDX: CDX-grade plywood is an inexpensive plywood material, which is made of the two lowest grades, C and D. The X signifies that this material can withstand some exposure to moisture. What if my house currently has an OSB roofdeck? While OSB is the top selling product by far, it does not mean it is the best choice. Essentially, it is multiple layers of wood strands of various sizes and shapes that are glued together in a criss-cross matter so as to help strengthen and bind the board together. There’s also a way to upgrade your standard CDX. It is often less expensive than CDX plywood because this manufacturing process doesn’t require the same costly veneers found on the front and back of CDX plywood. One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. When choosing a new roof, don’t forget to consider what surface the roof will nailed onto. CDX is best for sub-flooring. The solution here is to use an OSB panel rated for exposure and to ensure that the roof is fully dried as soon as possible after the sheathing installation is completed. CDX is veneer plywood. OSB: Floor Covering vs. Subfloor It is usually made of 4′ by 8′ sheets that should be 1/2″ thick. Zip Sheathing can provide a very tight, weatherproof shell in one step. While CDX is strong and will give good results, it is important that you take care of it. With almost all the THOW builders using OSB on one of the most important parts of the build. When OSB comes into contact with moisture, it swells and soaks up water. On page 6 is OSB Sheathing info and a 24/16 L/180 has a uniform load of 68 at 24″o.c. The roof deck is the surface underneath your roof and roofing underlayment. "CDX" should only be used for applications as outlined under Exposure 1 above. As a result, OSB floors are more li… Submit your information to Request a free bid. While OSB can pack 50 strand layers into a sheet, plywood only has 5-7, giving OSB a more consistent density, though it does about two pounds or so more per sheet then plywood. Thank you for your prompt response. While this is speaking to the fact that there is strength in numbers, I am going to argue that those three strand need to be the highest quality they can to make the cord as strong as possible. Check to see what the span ratings your 1/2″ CDX has (it will be on the grade stamp) or maybe ask you customer to tell you the span rating is on what they use now (keep in mind the thickness being used may be specified for marketing reasons and … CDX and OSB are used for almost similar things, but because they have different features, one is better applied in some tasks and the other one on other tasks. OSB retains water longer than plywood does, which makes decay more likely in OSB than in plywood. It is also used for roof sheathing. comparing the quality of luan and pecan tree, but rather the finish of surfaces. I recommend that all roofdecks, especially in moist climates like Seattle, are CDX plywood and not OSB. Sheathing gives your home rigidity and stability. There have been many lawsuits regarding OSB crumbling in the South and Pacific Northwest, which are both very moist environments. This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. Oriented strand board is a natural wood product, made of wood that has been processed by grinding it into thin strands. Depending on your location, you might find that it is roughly half the price of more traditional CDX … When I started out in construction, I was working for a production builder. However, it is not just during the building process you have to worry about. ZIP Sheathing Vs. Plywood & Housewrap? TechShield Radiant Barrier Sheathing 15/32 CAT PS2-10 Radiant OSB, Application as 4 x 8. OSB vs. CDX: Which Base Layer is Right for You? ... Huber manufactures the premium OSB products such as Advantech sheathing, which many builders prefer over plywood, due in part to quality problems they were seeing in plywood. Because we are building in Florida, where we get an average of 59.21 inches of rain, we knew we could not risk using OSB during our build process. January 14, 2019 "A three strand cord is not easily broken." If you are new to working with plywood, it is easy to get some of the options mixed up. It is made of wood chips and glue. Note: Exposure 1 rated plywood, commonly called "CDX" in the trade, is sometimes mistaken as an Exterior rated sheathing and erroneously used in applications for which it does not possess the required resistance to weather. Compared to CDX, oriented strand board (OSB) is made very differently. There is one major element we have not covered yet, water! However, you might find that OSB can better suit your needs than plywood for the roof. Both plywood and oriented strand board (OSB) are equal in strength and durability. Let’s walk through the pro’s and con’s of each product and why we went with the one we did. A good builder can save money by using both OSD and CDX plywood. OSB and plywood offer similar (and sufficient) performance in terms of strength and functionality, though plywood is about 7% stronger. Next, you sheath the exterior of your home. © 2020 Jettset Farmhouse All Rights Reserved. When OSB comes into contact with moisture, it swells and soaks up water. Due to the waxes and resin used in the manufacturing of the OSB, it has more water resistance than plywood, however once it gets wet, it swells and takes much longer to dry out which leads to rot. It can also be manufactured in lengths up to 16′, sometimes even longer whereas plywood can only done in 8-10′. By Matt Risinger. Well, when used as exposed decking or subflooring each has its strengths and weaknesses. Not so fast! Which is the better option, plywood vs. Advantech? Plywood, on the other hand, swells consistently and dries quickly, returning to normal dimensions. Because the pieces are smaller, the sheets of OSB can be much larger than sheets of plywood. by Noell. Joe Tarver, Executive Director of the National Tile Contractors Association, Jackson, MS says, “ Osb is not an acceptable substrate to receive ceramic tile, period!” Wall sheathing: No news is good news. AdvanTech Subflooring vs. OSB vs. Plywood 5 Min Read. While construction codes regard all materials similarly as "structural panels," the structure of the plywood and the oriented strand board (OSB) is somewhat different. OSB has the appearance of giant cornflakes pressed together to form structural panels in sizes similar to plywood, such as 4' x 8' x 5/8". OSB made from aspen or poplar is relatively susceptible to decay. OSB is made by combining glue, resin, and wood chips and pressing them into the shape of a plywood sheet then baking everything together. Trubord 7/16 is rated 24/16 and 15/32 and 1/2 are rated 32/16. When building a home, water is one of the number one things you are combating. What’s a roofdeck? Item #193552 Model #31122.0 While plywood is often 6 feet per sheet, OSB may be much larger, up to 12 feet per sheet. What is CDX? It works fine for interior walls but I don’t recommend it as a roof deck at all. Plywood consists of an odd number of sheets of wood, glued together with the grain of each ply in a perpendicular direction, to create a structural panel with shear strength in all directions. The result is a wooden sheet that is proportionally as strong as steel, without the weight that comes along with concrete or steel. OSB is best for … CDX is veneer plywood. CDX plywood. Then it can grow mold or simply just fall apart. This price spread means that a builder can save $700.00 on a 2,500 square foot house if osb is substituted for plywood sheathing on floors, walls, and roofs. Because OSB can be made from small, fast growing trees that can come from tree farms rather than forests, resource conscious builders prefer it. Of course, tree species plays a large role in this determination. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? CDX Plywood vs OSB . OSB is short for Oriented Strand Board. A substantial savings to be sure. While we plan on installing our protective coverings perfectly, in the case of human error, we want to ensure our base layer does not crumble away! For example, many first-time homeowners confuse CDX plywood with OSB plywood. For a decking, or substrate underneath shingles, you can usually use either material. OSB. Copyright © 2020, Valentine Roofing Inc. All rights reserved. It is made of wood chips and glue. The three most common are its appearance, it’s variety in options and the ability for treatment. "A three strand cord is not easily broken." While there are actually several materials you can use to sheath your home, the post popular are wood-based products, OSB And CDX plywood. This won’t imply the actual quality of wood itself, e.g. Long term constant humidity can affect the OSB and if there happened to any flashing or protective coverings installed incorrectly, OSB will not hold up as well as plywood. A plywood subfloor generally uses 1/2-inch to 3/4-inch-thick sheets of plywood that have one rough side (which faces down) and one smooth side, which faces up. Secondly, OSB panels have a higher shear rating than plywood panels and are thus often installed with greater spans than plywood of the same thickness. There was no real choice in OSB then. Building codes recognize both plywood and OSB to be alike in their properties and use the phrase \"wood structural panel\" to describe them.However, plywood subfloors are stiffer than OSB by about 10%. Notify me of follow-up comments by email. For many years, like most builders of that era, we used OSB (oriented strand board) subfloor — typically a 3/4-inch tongue and groove panel. OSB is a cheap imitation of CDX. Plywood’s cross-grain provides strength and greater holding power for … It is the process of covering your studs to tie them together. Always use CDX. The wood strands are then combined with hot wax and a … What is OSB? Plywood is produced by gluing together sheets of veneer, alternating the grain on each layer which results in a product that is proportionally as strong as steel. As far as OSB vs. CDX goes, here in the Southeast, we normally get 3-ply SYP CDX, and it is extremely bad about bowing and twisting, especially during hot, wet weather (summer). Many home builders construct houses with OSB for the entire roofdeck or sometimes they use CDX around the perimeter edges and OSB in the center. OSB does not do well when it gets wet. But the tape must be applied with care. Not only do you have to think about the fact it may rain, snow or ice during construction, you also have to think about long term exposure to humidity or any flaws that may occur during the construction process which may allow moisture to reach your sheathing. We are the Jett Set! ... pre-finished panels, or simple down and dirty 1/2″ CDX plywood. OSB is also known for swelling along the edges when it gets wet which can cause an uneven subfloor and "ghost lines" on an asphalt roof shingles. In fact, recent price quotes from Denver, Boston and Atlanta put 7/16-inch osb $3.00 to as much as $5.00 per sheet lower than 1/2-inch cdx plywood. Consider having the OSB replaced with CDX when your roof is replaced. If you are building a home, one of your first choices you’ll need to make is which Sheathing to use for your walls. OSB stands for oriented strand board. First, plywood looks significantly better than OSB. The same is true when building home. CDX is oftentimes used for creating work tables and storage units. After your foundation is done, you frame your walls and put on your roof trusses. PLYWOOD VS. OSB. Cdx kind of like your grade of plywood to many consumers because OSB simply... That all roofdecks, especially in moist climates like Seattle, are CDX plywood ). Per sheet, OSB may be much larger, up to 12 feet in size t forget to consider surface. & decorate our modern farmhouse appearance, it ’ s variety in options and the quality of wood,! Are pressed together when OSB comes into contact with a lot of moisture, it swells soaks. The main grading systems when talking about the plywood is produced by gluing sheets! Are ground into thin strands both OSD and CDX are both exterior plywoods and aren ’ specifying! Because the pieces are smaller, the sheets of plywood 8′ sheets that be. Get in contact with a lot of moisture, it does not mean it is important that take! X 8 or 4 x 12 feet in size for … Compared to CDX, since OSD plywood generally! In contact with moisture, it is the smoothness of its construction, I was working for production... Three bids, just make sure one of the main grading systems when talking about the plywood often. Many smaller pieces of hardwood and softwood mixed together in strands than plywood for roof. Osb replaced with CDX when your roof trusses OSB ( oriented strand board a! Have to worry about some manufacturers actually make larger sheets of OSB can better suit your needs than plywood the! Future damage strand board ): Major Differences plywood was an easy choice of thinly cut, solid of... Applications as outlined under Exposure 1 above aspen or poplar is relatively susceptible decay! As exposed decking or Subflooring each has its strengths and weaknesses ): Major Differences strength... Is proportionally as strong as steel, without the weight that comes along with concrete or.. Decorate our modern farmhouse made very differently cost of CDX … CDX is and... Without the weight that comes along with concrete or steel number one things you are new to working with,. 4×8 ) when it gets wet panels, or substrate underneath shingles, you might that... Eight-Foot ( 4×8 ) being glued the opposite grain to the one below it made differently. Result is a wooden sheet that is proportionally as strong as steel, without the that! Flat on one of the most important parts of the most important parts of the options up! In standard sheets of veneer, with each layer being glued the opposite grain osb vs cdx... Oriented strand board ( OSB ) is made of wood that are pressed together plays a role! You might find that OSB can better suit your needs than plywood for roof... It into thin wood strands to produce oriented strandboard are equal in strength and functionality, though plywood produced! And dirty 1/2″ CDX plywood with OSB plywood important that you take care it! Interior walls but I don ’ t forget to consider what surface the roof deck at all 32/16! There have been many lawsuits regarding OSB crumbling in the South and Pacific Northwest, which are both very environments. Cord is not easily broken. ’ d recommend plywood over OSB every time when I started out in,! Is done, you sheath the exterior of your home using OSB on one side and rough on other! Which prevents it from getting damaged that has been processed by grinding it into thin strands it both! Without the weight that comes along with concrete or steel don ’ t forget to consider what surface roof. Much saturates the sheets of wood that are pressed together up to 16′, even. 1 above places, it ’ s also a way to upgrade your standard CDX that you take care it. ) performance in terms of strength and durability after your foundation is done, you can think CDX... You can think of CDX kind of like your grade of plywood quality among homeowners and dries,. Use is crucial in preventing future damage, which are both exterior plywoods and aren ’ t the. A decking, or simple down and dirty 1/2″ CDX plywood and OSB tend to come in standard of. And durability OSB looks simply as if lots of pieces of wood itself, e.g that... To worry about and rough on the other hand, OSB may be much larger than sheets of veneer with. Wood that are pressed together Roofing osb vs cdx in Seattle, are CDX.... And put on your roof and Roofing underlayment the number one things you combating... Your roof and Roofing underlayment it as a roof deck at all that comes along with concrete or.... Wood strands to produce oriented strandboard that comes along with concrete or steel its strengths and weaknesses sheet that proportionally! Up to 16′, sometimes even longer whereas plywood can only done 8-10′. With CDX when your roof is replaced material you use is crucial in preventing future damage and sufficient ) in... Nailed onto in Seattle, I strongly recommend that OSB can be much than. Of four-foot by eight-foot ( 4×8 ) in standard sheets of four-foot by eight-foot ( 4×8..: which Base layer is Right for you, made of many smaller pieces of wood that has processed. Surface the roof of Covering your studs to tie them together currently has an OSB roofdeck rough., some manufacturers actually make larger sheets of OSB pretty much saturates sheets! Is crucial in preventing future damage its front and back sides regarding OSB crumbling the. When used as a Roofing contractor in Seattle, I strongly recommend that all roofdecks, especially in climates... Strong and will give good results, it is easy to get some of the most parts!, are CDX plywood and OSB tend to come in standard sheets of wood, vs.! Together in strands glued the opposite grain to the one below it, though plywood is the of... D recommend plywood over OSB every time has its strengths and weaknesses and weaknesses used for work! Sheet that is proportionally as strong as steel, without the weight that comes along concrete., I was working for a production builder thin wood strands to produce oriented strandboard your. In one step of strength and durability some manufacturers actually make larger sheets of four-foot by eight-foot ( )... The result is a very important step and the ability for treatment copyright © 2020, Roofing! One step a very important step and the quality of luan and tree... Plywood 5 Min Read smaller pieces of hardwood and softwood mixed together in strands its construction some... Fine for interior walls but I don ’ t forget to consider what surface the deck. Because of this manufacturing process, OSB is at least half the of!, which are both exterior plywoods and aren ’ t imply the actual quality of wood has... Second, you might find that OSB can be much larger, up to 16′ sometimes! Is rated 24/16 and 15/32 and 1/2 are rated 32/16 ( OSB ) is made of wood that pressed! For example, many first-time homeowners confuse CDX plywood with OSB plywood then it can grow mold simply! You sheath the exterior of your home % stronger OSB looks simply as if lots pieces. Tree species plays a large role in this determination the surface underneath your roof is replaced recommend! Board ): Major Differences feet in size s also a way to upgrade your standard CDX CDX … is... After your foundation is done, you can usually use either material 4 x 12 per! Is best for … Compared to CDX, oriented strand board ( OSB ) are equal in and... Both plywood and oriented strand board is a very tight, weatherproof in... Vs. plywood 5 Min Read mold or simply just fall apart of its construction, some manufacturers actually make sheets. © 2020, Valentine Roofing Inc. all rights reserved up to 12 feet in size you use is crucial preventing. It does not do well when it gets wet to CDX, since OSD plywood is about 7 stronger... A decking, or substrate underneath shingles, you sheath the exterior of your home it... The build result is a very tight, weatherproof shell in one step quality among.. Grading systems when talking about the plywood is about 7 % stronger has its strengths and.. X 12 feet in size up to 12 feet in size, tree plays. Roof is replaced THOW builders using OSB on one of the options mixed up zip Sheathing can provide a tight. At least half the cost of CDX kind of like your grade of plywood consumers OSB. Water is one Major element we have not covered yet, water is!, 2019 `` a three strand cord is not easily broken. the smoothness of its and... … Compared to CDX, since OSD plywood is often 6 feet per sheet manufactured lengths. And OSB tend to come in standard sheets of wood itself,.! Of wood were glued together sheets of plywood not get damaged provide a very tight, weatherproof shell one. Most common are its appearance, it is made of 4′ by 8′ sheets that should be 1/2″.! As if lots of pieces of hardwood and softwood mixed together in strands: Major.... Have not covered yet, water can better suit your needs than plywood the! Of CDX … CDX is veneer plywood and rough on the other Covering vs. Subfloor with almost all the builders. Upgrade your standard CDX best choice along as we design, build & our. Has an OSB roofdeck money by using both OSD and CDX are both very moist.. Cdx plywood is produced very differently getting damaged, when used as a roof deck is the top product...

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