While a sheet of plywood might be 5 to 7 plies thick, a sheet of OSB is made from as many as 50 strand layers packed and compressed into the same thickness. ArchDaily . 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. Many of these abbreviations that you hear will represent different types of plywood that are used for subflooring, roofing, and everything in between. Alternatively, OSB tends to be more waterproof than traditional plywood. Delamination is when plywood layers separate, largely due to humidity or extreme heat. 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. than CDX plywood. He also holds a bachelor's degree in English from Iowa University. It can hold up to the water for a limited amount of time, such as a few months. How does this product compare to using plywood and a housewrap such … CDX is a type of veneer plywood that is fabricated by gluing then pressing sheets of wood together to strengthen them. However, it needs to be covered and protected long-term. As mentioned above, the X in CDX stands for exposure. Melville, NY 11747, Terms & Conditions Plywood vs. OSB (Oriented Strand Board): Major Differences . It's the Ford vs Chevy debate. What this letter actually represents is the type of adhesive that bonds the sheets together. Many people like to use CDX plywood as subflooring in the construction of new homes. Use 5/8 inch C/C PTS grade for your overhangs and 5/8 inch CDX for the rest. However, OSB does not absorb water easily, but when it does, it takes quite a while to lose the water. What is CDX Plywood vs. OSB? OSB panels can be manufactured in lengths up to 16 feet (or sometimes even higher), while plywood is generally limited to 8 to 10 feet. There is no question that plywood is better then OSB. The cost of repairs will far exceed any savings you realize. But, there is an exception to pressure-treated CDX; they can withstand extreme moisture without getting water damaged. The glue and resin make it harder for the wood to absorb the water, allowing it to stand up better under harsher weather conditions. What’s a roofdeck? Once the plywood dries, it may end up warped due to the elements. Question and Answers. In 2001, oriented strand board surpassed plywood in terms of square footage produced. Within 10 … This is because it is resistant to moisture and therefore, it will not be damaged; at least not for a very long time. This won’t imply the actual quality of wood itself, e.g. The best example of this is using the plywood as subflooring during a construction process. One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. Because the adhesive and resin make it more difficult to absorb water, OSB is less likely to expand and contract with exposure to moisture. If you continue to use this site we will assume that you are happy with it. When you are boarding up for a big storm, you should be using at minimum 1/2″ CDX plywood. Perhaps the biggest thing plywood has going for it is the perception of higher quality among homeowners. Difference Between Cdx And Osb Qualities Lication AreasPlywood Vs Osb Which Is Better Pros OnlineRoofing Case Stus Arac Roof It ForwardPlywood […] Difference Between Cdx And Osb Qualities Lication AreasPlywood Vs Osb Which Is Better Pros OnlineRoofing Case Stus Arac Roof It ForwardPlywood […] The major distinction between these categories is the actual construction of the sheets. OSB holds up to water quite well, and it is easily seen as water-proof. It is only manufactured to hold up to water for a short period of time. If you have to choose, you need to know the difference between CDX vs. OSB. 4 years ago . Up until 2000, plywood held the majority of the market for wall, roof, and floor sheathing when it was surpassed by OSB, which as of 2018, held about 75% of the market share. Other engineered wood panel types, such as particle board or OSB, contain a much higher percentage of glue, and since glue is heavier than wood, these panels tend to be significantly heavier than plywood. Because OSD does not use costly veneers it is as much as half the price of regular plywood. CDX plywood is durable and moisture proof. 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. This can result in visible deflection of the panels between the supports and can telegraph through causing a wavy appearance to the roof. 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. 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. Please send me any information you can that would demonstrate that Trubord OSB is a suitable replacement for CDX. This provides an inherent system of checks and balances that makes plywood a relatively stable material. On the other hand, OSB is produced very differently. Plywood vs. OSB Protect an unfinished home from the elements—and a finished home from the consequences of plumbing disasters—by starting with a … Depending on your location, you might find that it is roughly half the price of more traditional CDX plywood. About CDX Plywood. It is often less expensive than CDX plywood because this manufacturing process doesnât require the same costly veneers found on the front and back of CDX plywood. At the end of the day, you should only really use CDX plywood for interior applications or surfaces that will not see much water. If you are asking why knowing their differences is so important, here is why. Since it will never be visible, it may just be a waste of money. Jim McFarland, Vandalia, OH. It seems like 9 out of 10 new homes and remodels in my area (northern New England) are using green ZIP sheathing on the walls and some use the red version of the roof as well. CDX plywood is created by bundling layers of wood together. AC is used when a very nice finish is necessary. They also both involve layers of material instead of being solid pieces of wood like dimensional lumber. I recommend that all roofdecks, especially in moist climates like Seattle, are CDX plywood and not OSB. The major distinction between these categories is the actual construction of the sheets. OSB swells more than plywood when it comes in contact with moisture, and it generally remains swollen to some degree. However, as plywood has been around longer, it has shown that it can last 50 or more years in an installation. OSB and Plywood: What should you choose? This won’t imply the actual quality of wood itself, e.g. The roof deck is the surface underneath your roof and roofing underlayment. Share on Facebook. Tools & Reviews Materials. Both plywood and oriented strand board (OSB) are equal in strength and durability. ZIP Sheathing Vs. Plywood & Housewrap? OSB also seems to be good for roof sheathing. The edges of the boards may swell and cause ridges on the roof beneath the shingles. Whether you are building, remodeling, or just doing some repairs, many times you need a type of sheathing or underlayment for the project. One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. Similarly, there are major differences between plywood and OSB. Second, you can think of CDX kind of like your grade of plywood. This is because the glue and resin used in its processing prevent it from absorbing water even during the extremely humid and wet seasons. We have a customer asking for technical info regarding span ratings on 7/16″ OSB wall sheathing vs. 1/2″ CDX. Moisture resistance ... with less glue than plywood. From a structural standpoint Plywood and OSB panels are considered equitable although their different manufacturing techniques give each board its advantages and disadvantages. Plywood is made with an odd number of layers for optimal strength and performance. Numerous choices are available for this purpose, but the two most commonly used products are oriented strand board (OSB) and plywood 1.Both boards are made of wood with glues and resins, come in many sizes, and can be used for a variety of purposes. 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. However, more and more contractors are turning to RTD because of its inherent benefit. If you are new to working with plywood, it is easy to get some of the options mixed up. OSB absorbs water much more readily, causing it to swell, and is quicker to delaminate under wet conditions. August 30, 2020. For a decking, or substrate underneath shingles, you can usually use either material. OSD plywood (which is also commonly known as OSB or oriented strand board) is produced by binding wood chips together with a mix of glue and resin. CDX is best for sub-flooring. 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