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. Plywood and OSB are generally considered to have the same load strength. If this is your final finish, we’d recommend plywood over OSB every time. newbuilder | Posted in Construction Techniques on November 6, 2004 06:48am Seems to me this MUST have been ‘talked about’ here an there… but in addition to my general quiry I’ve got some very specific questions. 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. When used as roof sheathing, this tendency to hold moisture means it will degrade faster than plywood when exposed to chronic leaks. There’s also a way to upgrade your standard CDX. The trend among builders is to switch to osb. Treated for ground contact use, it is ideal for a variety of applications, including deck, playsets and walkways. A: Clayton DeKorne, chief editor of JLC, responds: VOC emissions are pretty much a nonissue for exterior-grade plywood and OSB. For a decking, or substrate underneath shingles, you can usually use either material. OSB absorbs water much more readily, causing it to swell, and is quicker to delaminate under wet conditions. 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. AdvanTech Subflooring vs. OSB vs. Plywood 5 Min Read. That's why people prefer Advantech over plywood and OSB flooring. Once the plywood dries, it may end up warped due to the elements. The sheets are generally 4 x 8 or 4 x 12 feet in size. OSB boasts a more consistent density. When I started out in construction, I was working for a production builder. Second, you can think of CDX kind of like your grade of plywood. 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. x 4 ft. x 8 ft. CDX Ground Contact Pressure-Treated Plywood This plywood is Pressure-Treated in order This plywood is Pressure-Treated in order to protect it from termites, fungal decay and rot. One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. 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 fully adhered membrane is only really worth it if you are doing something silly like open cladding or zero overhang with no gutters. 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. OSB retains water longer than plywood does, which makes decay more likely in OSB than in 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. Moisture resistance • Plywood absorbs ... with less glue than 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. OSB, CDX, ACX and T&G Plywood For mobile users: touch and drag to move table left, right, up or down. There was no real choice in OSB then. Just make sure it is exterior grade ply so it will not delaminate if it gets wet. There is no question that plywood is better then OSB. Let’s walk through the pro’s and con’s of each product and why we went with the one we did. 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. Question and Answers. CDX Plywood vs OSB . 1/2 in. While OSB is the top selling product by far, it does not mean it is the best choice. OSB is now used for about 70 percent of all floor, wall and roof sheathing in North America. It is super smooth and sturdy and makes for a great work surface or a strong cabinet carcass. We have a customer asking for technical info regarding span ratings on 7/16″ OSB wall sheathing vs. 1/2″ CDX. My go to option for cabinets boxes and work tables surfaces is 3/4″ birch plywood. Here’s what you need to know. In 2001, oriented strand board surpassed plywood in terms of square footage produced. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? Plywood vs. OSB (Oriented Strand Board): Major Differences . I’m figuring there must be some advantage as I occassionally … Jim McFarland, Vandalia, OH. However, as plywood has been around longer, it has shown that it can last 50 or more years in an installation. PLYWOOD VS. OSB. Thank you for your prompt response. Many people like to use CDX plywood as subflooring in the construction of new homes. OSB does not have the same track record because it has only been marketed for about 30 years. Work Surfaces . Are there any roofing situations where osb should NOT be used? than CDX plywood. Their architect is asking whether OSB will provide the same strength as CDX, and meet code requirements. We have used OSB for some time now.We use 5/8 on the roof,7/16 on the sidewalls.All with plywood clips for strength and proper exspansion gaps.However, 3/4 T+G ulc or cdx for floors stands up to the weather while building. By. 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 mixture is then cast and baked to produce a plywood-like sheet. L Plywood vs. OSB New-generation structural panels mean decade-old notions are no way to choose sheathing. Generally plywood/osb with taped seams with regular house wrap is your lowest cost well sealed assembly. By Clayton DeKorne Download the PDF version of this article. CDX plywood is still a great piece of plywood if you are looking to build something that does not require a pristine surface. Share on Facebook. Use 5/8 inch C/C PTS grade for your overhangs and 5/8 inch CDX for the rest. OSB made from aspen or poplar is relatively susceptible to decay. First, plywood looks significantly better than OSB. Tweet on Twitter. Plywood used to be king for wall sheathing and flooring material, but oriented strand board (OSB), introduced in the late 70s, is now the most popular. CDX is oftentimes used for creating work tables and storage units. Home Uncategorized Selecting The Right Plywood, BC vs. CDX. Uncategorized; Selecting The Right Plywood, BC vs. CDX. By Matt Risinger. Since the plywood is water resistant, its useful in any location that may have water exposure, but keep in mind that it's not waterproof. VOCs in Plywood vs OSB. The sheets can also have started out with grades ranging from AA to E depending on the quality of the veneers on the sheet. Answer. Panels designated Structural I must meet all of the manufacturing and performance standards of Rated Sheathing, as well as certain additional requirements. However, more and more contractors are turning to RTD because of its inherent benefit. plywood cdx -vs- OSB. 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. In general, I’m wondering what the upside of using plywood is over OSB as sub-siding. Building codes, the Engineered Wood Association, architects and most builders rate plywood and oriented strand board (OBS sheathing) equal in strength and durability. Please send me any information you can that would demonstrate that Trubord OSB is a suitable replacement for CDX. But the truth is that, even though both OSB and CDX plywood are commonly used in a single home construction site, there is a big difference between these two plywood types! Exterior-rated structural panels use moisture-resistant phenolic … It has a clean and smooth surface, and it holds nails and screws well. In 2009, Advantech won the best product competition in Architectural Record and it has been the favorite flooring brand since 2002. OSB takes longer than plywood to get saturated, but also takes much longer to dry out. 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. If you are new to working with plywood, it is easy to get some of the options mixed up. (339.26 kB) Q: What are the concerns about VOC emissions from exterior plywood and OSB? Because plywood is rated as shop grade because of defects, almost any type of plywood can end up in the shop grade bin. Nowadays this flooring also comes with a 50-year warranty for every new buyer. Structural I, also referred to as “STRUC I,” may be OSB or plywood and is, essentially, a subcategory of APA Rated Sheathing. comparing the quality of luan and pecan tree, but rather the finish of surfaces. The three most common are its appearance, it’s variety in options and the ability for treatment. Because OSD does not use costly veneers it is as much as half the price of regular plywood. OSB and plywood offer similar (and sufficient) performance in terms of strength and functionality, though plywood is about 7% stronger. A substantial savings to be sure. OSB does not provide adequate protection against fast moving storm debris. Furthermore, when OSB gets wet, its edges tend to swell and stay swollen even after the panel has dried out. Plywood’s cross-grain provides strength and greater holding power for screws and nails than solid-sawn wood. ACX and CDX are both exterior plywoods and aren’t specifying the type of wood. Of course, tree species plays a large role in this determination. BY SEAN GROOM Drawings this page: Don Mannes. This includes interior and exterior plywood of any thickness. OSB vs Plywood: Fast Fact. When you are boarding up for a big storm, you should be using at minimum 1/2″ CDX plywood. 3/8” OSB (9.5mm) 1.25 per square foot: 40 lbs: 5/16 OSB (7.5mm) 1.43 per square foot: 45.76 lbs: 1/2” OSB (12.5mm) 1.67 per square foot: 53.44 lbs: 5/8” OSB (15.5mm) 2.08 per square foot: 66.56 lbs: 3/4” OSB (18.5mm) 2.50 per square foot: 80 lbs: PLYWOOD BOARD. Sanded Pine: Sanded pine is a versatile plywood material. For example, many first-time homeowners confuse CDX plywood with OSB plywood. 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. This won’t imply the actual quality of wood itself, e.g. One of CDX plywood's characteristics is water retention when it comes into contact with harsh elements like rain.

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