It is made of wood chips and glue. 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 […] Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? 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. This won’t imply the actual quality of wood itself, e.g. 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). Cover it on both occasions and maintain it regularly to ensure it does not get damaged. But the tape must be applied with care. While plywood is often 6 feet per sheet, OSB may be much larger, up to 12 feet per sheet. A good builder can save money by using both OSD and CDX plywood. What is OSB? ZIP Sheathing Vs. Plywood & Housewrap? 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. This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. choose CDX, since OSD plywood is generally flat on one side and rough on the other. January 14, 2019 "A three strand cord is not easily broken." Trubord 7/16 is rated 24/16 and 15/32 and 1/2 are rated 32/16. On the other hand, OSB is produced very differently. OSB: Floor Covering vs. Subfloor Compared to CDX, oriented strand board (OSB) is made very differently. AdvanTech Subflooring vs. OSB vs. Plywood 5 Min Read. 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. When choosing a new roof, don’t forget to consider what surface the roof will nailed onto. Notify me of follow-up comments by email. Perhaps the biggest thing plywood has going for it is the perception of higher quality among homeowners. 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. ... pre-finished panels, or simple down and dirty 1/2″ CDX plywood. 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 there are actually several materials you can use to sheath your home, the post popular are wood-based products, OSB And CDX plywood. Consider having the OSB replaced with CDX when your roof is replaced. What if my house currently has an OSB roofdeck? Because the pieces are smaller, the sheets of OSB can be much larger than sheets of plywood. Zip Sheathing can provide a very tight, weatherproof shell in one step. Because of this manufacturing process, OSB is at least half the cost of CDX … It can also be manufactured in lengths up to 16′, sometimes even longer whereas plywood can only done in 8-10′. Then it can grow mold or simply just fall apart. 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. 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. If you are new to working with plywood, it is easy to get some of the options mixed up. Osb and plywood are equals structurally, but flooring manufacturers make different recommendations regarding their use as a substrate. For a decking, or substrate underneath shingles, you can usually use either material. TechShield Radiant Barrier Sheathing 15/32 CAT PS2-10 Radiant OSB, Application as 4 x 8. By Matt Risinger. 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. Structure or Basic Composition. While CDX is strong and will give good results, it is important that you take care of it. 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. Second, you can think of CDX kind of like your grade of plywood. There is one major element we have not covered yet, water! OSB does not do well when it gets wet. As a roofing contractor in Seattle, I strongly recommend that OSB is never used as a roofdeck. 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. One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. 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! 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. CDX plywood is produced by gluing together sheets of veneer, with each layer being glued the opposite grain to the one below it. OSB is made by combining glue, resin, and wood chips and pressing them into the shape of a plywood sheet then baking everything together. However, you might find that OSB can better suit your needs than plywood for the roof. Well, when used as exposed decking or subflooring each has its strengths and weaknesses. 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. 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. It is made of multiple layers of thinly cut, solid sheets of wood that are pressed together. OSB is short for Oriented Strand Board. When building a home, water is one of the number one things you are combating. For example, many first-time homeowners confuse CDX plywood with OSB plywood. Oriented strand board (OSB) combines wood chips, glue, and resin into the shape of a sheet of plywood and bakes them together. When OSB comes into contact with moisture, it swells and soaks up water. CDX Plywood vs OSB . 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. It is made of wood chips and glue. On page 6 is OSB Sheathing info and a 24/16 L/180 has a uniform load of 68 at 24″o.c. 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 more resistant to moisture since the glue that holds the strands together pretty much saturates the sheets. ... 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. The wood strands are then combined with hot wax and a … We are the Jett Set! CDX is veneer plywood. Depending on your location, you might find that it is roughly half the price of more traditional CDX … Sanded Pine: Sanded pine is a versatile plywood material. With almost all the THOW builders using OSB on one of the most important parts of the build. 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". 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" should only be used for applications as outlined under Exposure 1 above. The roof deck is the surface underneath your roof and roofing underlayment. ®. OSB is a cheap imitation of CDX. OSB retains water longer than plywood does, which makes decay more likely in OSB than in plywood. OSB stands for oriented strand board. OSB is best for … © 2020 Jettset Farmhouse All Rights Reserved. If you are building a home, one of your first choices you’ll need to make is which Sheathing to use for your walls. As a result, OSB floors are more li… It is the process of covering your studs to tie them together. Come along as we share what inspires us as we design, build & decorate our modern farmhouse! Because OSB can be made from small, fast growing trees that can come from tree farms rather than forests, resource conscious builders prefer it. 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. Let’s walk through the pro’s and con’s of each product and why we went with the one we did. 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. Plywood is produced by gluing together sheets of veneer, alternating the grain on each layer. What is CDX? 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. OSB does not do well when it gets wet. After your foundation is done, you frame your walls and put on your roof trusses. While construction codes regard all materials similarly as "structural panels," the structure of the plywood and the oriented strand board (OSB) is somewhat different. I recommend that all roofdecks, especially in moist climates like Seattle, are CDX plywood and not OSB. How do CDX and OSB differ in performance? So for us and our geographical location, plywood was an easy choice! CDX plywood. Both plywood and oriented strand board (OSB) are equal in strength and durability. 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. Not so fast! 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. There’s also a way to upgrade your standard CDX. CDX is veneer plywood. So if both products are equally strong and OSB is cheaper and comes in more convenient sizes, it seems like an easy choice, right? How do CDX and OSB differ in performance? There was no real choice in OSB then. 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. When OSB comes into contact with moisture, it swells and soaks up water. Thank you for your prompt response. by Noell. CDX is oftentimes used for creating work tables and storage units. 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