Alternatively, OSB tends to be more waterproof than traditional plywood. If you are not among the people searching for such answers, then you should be because it is important to know what the two are and their differences. Even though CDX is not waterproof and absorbs water easily, it also loses this water quickly and goes back to its original shape. When it dries, it is more likely to return to its … Melville, NY 11747, Terms & Conditions Well, when used as exposed decking or subflooring each has its strengths and weaknesses. This is a question most people seem to seek answers to. OSB is ideal for these applications where the CDX simply will not work. Unlike OSB, plywood has been developed into different types over the years in different ways to be used for different purposes. OSB is much more waterproof than plywood and CDX plywood. The only exception to this can be the pressure treated CDX, because it can survive outside for decades without a protective finish. One of the main areas that people tend to run into these issues is when they are trying to find plywood for their roofing. Both these manufactured sheets of wood are very essential in construction, and truth be told, you can hardly build your house without using at least one of them. The result is that the tendency for the boards to warp into their original shape is diminis… Plywood absorbs water more quickly, but it also dries more quickly. OSB vs Plywood: Fast Fact. OSB is best for substrate underneath shingles or decking. While plywood is generally limited to 8 to 10 feet lengths, OSB panels can be manufactured in lengths up to 16 feet. This provides an inherent system of checks and balances that makes plywood a relatively stable material. Save my name, email, and website in this browser for the next time I comment. OSB absorbs water more slowly than plywood, which can be beneficial in areas of low dampness. OSB is now used for about 70 percent of all floor, wall and roof sheathing in North America. The National Roofing Contractors Association, the Asphalt Roofing Manufacturers Association. Plywood Holds the Moisture Advantage Over OSB. Sherwood Lumber uses cookies to ensure that we give you the best experience on our website. (Most people mistakenly think that it stands for “exterior”.) It is also used for roof sheathing. 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. While CDX is strong and will give good results, it is important that you take care of it. In the end, many people opt for OSB because it is lower in price and more stable than CDX plywood. Even after losing the water, it will take time for it to go back to its original state. Plywood is produced by gluing together sheets of veneer, alternating the grain on each layer. The major distinction between these categories is the actual construction of the sheets. CDX vs OSB sheeting. Trubord 7/16 is rated 24/16 and 15/32 and 1/2 are rated 32/16. What’s a roofdeck? But take care, it also requires that you use water-resistant coating at the edges. Because the adhesive and resin make it more difficult to absorb water, OSB is less likely to expand and contract with exposure to moisture. CDX is veneer plywood, which is manufactured by gluing and pressing together sheets of wood. The protection of the shingles isn’t likely to be enough to prevent the plywood from becoming warped and delaminated over time. A 3 / 4 ” sheet is actually 23 / 32 ” thick. ACX and CDX are both exterior plywoods and aren’t specifying the type of wood. At the end of the day, you should only really use CDX plywood for interior applications or surfaces that will not see much water. A: Clayton DeKorne, chief editor of JLC, responds: VOC emissions are pretty much a nonissue for exterior-grade plywood and OSB. Each layer is held in place by quality binders and adhesives. In 2001, oriented strand board surpassed plywood in terms of square footage produced. Many of these abbreviations that you hear will represent different types of plywood that are used for subflooring, roofing, and everything in between. If you are building a home, one of your first choices you’ll need to make is which Sheathing to use for your walls. There you will see that a 24/0 plywood panel has a uniform load at L/180 of 57 at 24″o.c. Don’t get frazzled and confused during the construction or repair of your home. This is because it is resistant to moisture and therefore, it will not be damaged; at least not for a very long time. You will need to remove everything and start all over or ask a specialist to correct the mistake. OSB holds up to water quite well, and it is easily seen as water-proof. By Clayton DeKorne Download the PDF version of this article. The biggest difference is how both react when exposed to large amounts of moisture over an extended period of time. On the other hand, OSB is produced very differently. In the case of CDX plywood, the X at the end denotes that it is rated for exposure. This means that the plywood allows being exposed to moisture, but just for a limited period of time A prolonged exposure will lead to water damage. That is why OSB is sometimes used to secure houses when a hurricane draws near. OSB holds up to water quite well, and it is easily seen as water-proof. Both plywood and oriented strand board (OSB) are equal in strength and durability. However, there is one area of concern in which plywood beats OSB. Similarly, there are major differences between plywood and OSB. Are there any roofing situations where osb should NOT be used? Cover it on both occasions and maintain it regularly to ensure it does not get damaged. Plywood and OSB manufacturers try to improve this by sealing the panel edges, but the sealant, whether it is a wax or a paint, tends to get scuffed off. On page 6 is OSB Sheathing info and a 24/16 L/180 has a uniform load of 68 at 24″o.c. While this may sound similar to CDX plywood, it is a very different composition process, and OSB board is generally much less durable than 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. Determining how well they can hold up to water also determines what types of applications each one is best suited for. Not to mention, you don’t necessarily need to pay the veneer that you will get with the CDX grade of plywood. Plywood for the Roof: What Should You Choose. CDX is used as an upgrade over OSB aesthetically, but no, it’s not winning any beauty contests. Because plywood is rated as shop grade because of defects, almost any type of plywood can end up in the shop grade bin. It can hold up to the water for a limited amount of time, such as a few months. Press Esc to cancel. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? Even as affordable as they are, well-reputable stores like Sherwood Lumber still offer insane deals and discounts. Should they go with OSB vs. CDX plywood for the roof? 225 Broadhollow Rd.Suite 310W The first piece of wood is placed so that it rolls “up” while each subsequent layer is laid 90 degrees to the one below it, and upside-down. Imagine when you want to do your subfloor or roof sheathing and you confuse the two, then two months later, the wood start cracking and rotting, due to water damage. Plywood is made with an odd number of layers for optimal strength and performance. 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