The roof deck is the surface underneath your roof and roofing underlayment. Because of this manufacturing process, OSB is at least half the cost of CDX … OSB is more resistant to moisture since the glue that holds the strands together pretty much saturates the sheets. 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. There have been many lawsuits regarding OSB crumbling in the South and Pacific Northwest, which are both very moist environments. ®. What if my house currently has an OSB roofdeck? The same is true when building home. It can also be manufactured in lengths up to 16′, sometimes even longer whereas plywood can only done in 8-10′. Second, you can think of CDX kind of like your grade of plywood. AdvanTech Subflooring vs. OSB vs. Plywood 5 Min Read. I recommend that all roofdecks, especially in moist climates like Seattle, are CDX plywood and not OSB. If you are new to working with plywood, it is easy to get some of the options mixed up. CDX plywood. 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. 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. Plywood vs. OSB (Oriented Strand Board): Major Differences . One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. It is made of wood chips and glue. 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. 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. ZIP Sheathing Vs. Plywood & Housewrap? It is made of multiple layers of thinly cut, solid sheets of wood that are pressed together. On page 6 is OSB Sheathing info and a 24/16 L/180 has a uniform load of 68 at 24″o.c. January 14, 2019 "A three strand cord is not easily broken." First, plywood looks significantly better than OSB. 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 […] On the other hand, OSB is produced very differently. Submit your information to Request a free bid. Of course, tree species plays a large role in this determination. It is the process of covering your studs to tie them together. OSB stands for oriented strand board. OSB does not do well when it gets wet. choose CDX, since OSD plywood is generally flat on one side and rough on the other. 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. For example, many first-time homeowners confuse CDX plywood with OSB plywood. ... pre-finished panels, or simple down and dirty 1/2″ CDX plywood. The result is a wooden sheet that is proportionally as strong as steel, without the weight that comes along with concrete or steel. CDX Plywood vs OSB . By Matt Risinger. After your foundation is done, you frame your walls and put on your roof trusses. 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! 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. Copyright © 2020, Valentine Roofing Inc. All rights reserved. ... 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. CDX is oftentimes used for creating work tables and storage units. 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. 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. comparing the quality of luan and pecan tree, but rather the finish of surfaces. When OSB comes into contact with moisture, it swells and soaks up water. Let’s walk through the pro’s and con’s of each product and why we went with the one we did. CDX is best for sub-flooring. But the tape must be applied with care. While construction codes regard all materials similarly as "structural panels," the structure of the plywood and the oriented strand board (OSB) is somewhat different. When building a home, water is one of the number one things you are combating. For a decking, or substrate underneath shingles, you can usually use either material. It is also used for roof sheathing. There was no real choice in OSB then. 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. Notify me of follow-up comments by email. 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 … © 2020 Jettset Farmhouse All Rights Reserved. Trubord 7/16 is rated 24/16 and 15/32 and 1/2 are rated 32/16. 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. The wood strands are then combined with hot wax and a … CDX is veneer plywood. Next, you sheath the exterior of your home. Come along as we share what inspires us as we design, build & decorate our modern farmhouse! 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. Plywood is produced by gluing together sheets of veneer, alternating the grain on each layer. Plywood, on the other hand, swells consistently and dries quickly, returning to normal dimensions. What is OSB? With almost all the THOW builders using OSB on one of the most important parts of the build. While CDX is strong and will give good results, it is important that you take care of it. This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. This is a very important step and the quality and type of material you use is crucial in preventing future damage! While there are actually several materials you can use to sheath your home, the post popular are wood-based products, OSB And CDX plywood. However, you might find that OSB can better suit your needs than plywood for the roof. 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. 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. The same is true when building home. It is made of multiple layers of thinly cut, solid sheets of wood that are pressed together. OSB is a cheap imitation of CDX. This won’t imply the actual quality of wood itself, e.g. "CDX" should only be used for applications as outlined under Exposure 1 above. Item #193552 Model #31122.0 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. 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. 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. Depending on your location, you might find that it is roughly half the price of more traditional CDX … Oriented strand board (OSB) combines wood chips, glue, and resin into the shape of a sheet of plywood and bakes them together. "A three strand cord is not easily broken." The sheets are generally 4 x 8 or 4 x 12 feet in size. 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. In such places, it does not get in contact with a lot of moisture, which prevents it from getting damaged. A substantial savings to be sure. OSB and plywood offer similar (and sufficient) performance in terms of strength and functionality, though plywood is about 7% stronger. 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. 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. 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 vs. CDX: Which Base Layer is Right for You? When I started out in construction, I was working for a production builder. 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%. When OSB comes into contact with moisture, it swells and soaks up water. Always use CDX. OSB is a cheap imitation of CDX. 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". 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. However, it is not just during the building process you have to worry about. Sheathing gives your home rigidity and stability. Which is the better option, plywood vs. Advantech? ACX and CDX are both exterior plywoods and aren’t specifying the type of wood. What’s a roofdeck? Both CDX plywood and OSB tend to come in standard sheets of four-foot by eight-foot (4×8). 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. OSB does not do well when it gets wet. Sanded Pine: Sanded pine is a versatile plywood material. 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. Well, when used as exposed decking or subflooring each has its strengths and weaknesses. 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. While plywood is often 6 feet per sheet, OSB may be much larger, up to 12 feet per sheet. OSB retains water longer than plywood does, which makes decay more likely in OSB than in plywood. Not so fast! This prevent them from twisting and bending, provides a nailing base for your exterior finish, and gives a layer of protection against exterior elements. Then it can grow mold or simply just fall apart. It is usually made of 4′ by 8′ sheets that should be 1/2″ thick. Oriented strand board is a natural wood product, made of wood that has been processed by grinding it into thin strands. Compared to CDX, oriented strand board (OSB) is made very differently. Because of its construction, some manufacturers actually make larger sheets of OSB. CDX is veneer plywood. 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. OSB made from aspen or poplar is relatively susceptible to decay. A good builder can save money by using both OSD and CDX plywood. 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. OSB. OSB is best for … 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. If this is your final finish, we’d recommend plywood over OSB every time. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? 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. 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. As a roofing contractor in Seattle, I strongly recommend that OSB is never used as a roofdeck. How do CDX and OSB differ in performance? Plywood’s cross-grain provides strength and greater holding power for … Osb and plywood are equals structurally, but flooring manufacturers make different recommendations regarding their use as a substrate. How do CDX and OSB differ in performance? There’s also a way to upgrade your standard CDX. What is CDX? We are the Jett Set! OSB- Oriented Strand Board are made from logs that are ground into thin wood strands to produce oriented strandboard. Structure or Basic Composition. As a result, OSB floors are more li… So for us and our geographical location, plywood was an easy choice! CDX plywood is produced by gluing together sheets of veneer, with each layer being glued the opposite grain to the one below it. It is made of wood chips and glue. 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). Both plywood and oriented strand board (OSB) are equal in strength and durability. Consider having the OSB replaced with CDX when your roof is replaced. It works fine for interior walls but I don’t recommend it as a roof deck at all. OSB: Floor Covering vs. Subfloor Because the pieces are smaller, the sheets of OSB can be much larger than sheets of plywood. Thank you for your prompt response. 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. While OSB is the top selling product by far, it does not mean it is the best choice. OSB is made of many smaller pieces of hardwood and softwood mixed together in strands. OSB is short for Oriented Strand Board. Cover it on both occasions and maintain it regularly to ensure it does not get damaged. 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. Zip Sheathing can provide a very tight, weatherproof shell in one step. Because OSB can be made from small, fast growing trees that can come from tree farms rather than forests, resource conscious builders prefer it. Get Three bids, just make sure one of them is Valentine Roofing! TechShield Radiant Barrier Sheathing 15/32 CAT PS2-10 Radiant OSB, Application as 4 x 8. 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. The three most common are its appearance, it’s variety in options and the ability for treatment. PLYWOOD VS. OSB. OSB is made by combining glue, resin, and wood chips and pressing them into the shape of a plywood sheet then baking everything together. There is one major element we have not covered yet, water! 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. by Noell.
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