CDX plywood has one side veneer grade “C” and one side veneer grade “D”. Your source for the latest products and trends within the architecture, construction, interior design, and building materials industry. When considering CDX plywood thicknesses, remember that these are nominal sizes, and you should account for a deduction of about 1/32 inches after sanding, which most projects will require. Plywood sheathing is ideal for residential and light construction. Our plywood calculator can estimate the number of 4′ x 8′ sheets needed for a project. DoItYourself.com®, founded in 1995, is the leading independent The “RTD” in RTD plywood stands for Resistance Temperature Detector. Inside of the home, CDX plywood is often used as an additional flooring layer that rests just below the carpet pad or as a backer board for tiling. It does have some downsides, though. Every piece meets the highest grading standards for strength and appearance. CDX plywood is created by bundling layers of wood together. CDX plywood can also be used in many different craft projects. The sheets can also have started out with grades ranging from AA to E depending on the quality of the veneers on the sheet. US Voluntary Product Standard PS 1-09 Structural Plywood PS1-09 Structural PlywoodPS 1-09 is a product standard covering the requirements for American plywood intended for structural (loadbearing) use. One of the most common uses for plywood is for subflooring in new construction homes. Plywoods are known for their strong resistance to cracking, breaking, or twisting. But it should be emphasized that ‘minimal’ is the key word here. Rain and snow can serve as a serious threat to the integrity of a structure made with CDX plywood. CDX plywood is the lowest class of plywood and is often used in the construction industry or as a base for other materials. CDX plywood is much thicker and can be bought for low prices in large volumes. © Innovative Building Material | All Rights Reserved | Privacy Policy. Inside of the home, CDX plywood is often used as an additional flooring layer that rests just below the carpet pad or as a backer board for tiling. 2.4 Common Performance Categories And Corresponding Span Ratings Performance Category Span Rating 3/8 24/0 7/16 24/16 The letters A, B, C and D typically refer to the veneer or face of the material. Copyright© "CDX" should only be used for applications as outlined under Exposure 1 above. ACX and CDX are both exterior plywoods and aren’t specifying the type of wood. US Voluntary Product Standard PS 1-09 Structural Plywood PS1-09 Structural PlywoodPS 1-09 is a product standard covering the requirements for American plywood intended for structural (loadbearing) use. Because of these differences, OSB is generally the better choice for exterior roofing projects and shingle foundations. Plywood sheets that rank A or B tend to be the most expensive pieces, whereas C-level and D-level plywood pieces are more affordable and cheaper in quality, making it a more economical option. Plywood in general – and especially CDX plywood – is known for being susceptible to damage from everyday elements. 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. Veneer in a finished US trademarked plywood panel must conform to one of the six grades listed in the US PS 1-09 standard: N, the highest classification (rarely produced), followed by A, B, C-plugged, C and D. Non-overlaid APA plywood panels come in three levels of … This plywood is made to function better outdoors - deals with temp changes and moisture better than other forms of plywood. BCX Plywood for Subfloor. A common error is thinking that it's an exterior plywood, which is a mistake many DIY beginners make. comparing the quality of luan and pecan tree, but rather the finish of surfaces. The letters A, B, C and D typically refer to the veneer or face of the material. Some mistakenly think the "X" stands for "exterior"—which is not true, exactly. This won’t imply the actual quality of wood itself, e.g. The letters A, B, C and D typically refer to the veneer or face of the material. CDX stands for “C-D Exposure 1 plywood”. CDX plywood can tell you a lot about how it is made simply in its name. CDX is the most common exterior plywood grade. You may freely link Plywood as we know it has been produced since early in the 20th century. CDX is a type of plywood. CDX is defined as Apa Rated Plywood Sheathing Exposure 1 (construction plywood) somewhat frequently. While the classification of CDX plywood may seem like it is not a very durable option, CDX plywood is actually a perfectly suitable choice for a lot of home building projects, both inside and outside of the home! CDX plywood is much thicker and can be bought for low prices in large volumes. As a result, some plywood manufacturers now use low formaldehyde-emitting glue … To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. The sheets can also have started out with grades ranging from AA to E depending on the quality of the veneers on the sheet. Exterior plywood is glued together with adhesives that are meant to survive in wet or moist areas. In addition to the plywood grades, there are four common plywood bonding types. The letter "X" means the glue of the plywood is exterior glue . If the plywood sheet is found to have delaminated areas, it is sold as a lower grade plywood at a reduced market value. I've got a plywood question for all you wood pros out there...I've built a ... 10' long section of house exterior wood wall rotted. The Letter X. Marine Plywood. APA Rated Sheathing panels are produced as plywood or oriented strand board (OSB). Plywood is a sheet material manufactured by gluing together several thin layers of softwood or hardwood veneers. problems contact webmaster@doityourself.com. The videos and photos found in lessons also help the user to have a better understanding of automotive practices." After all, because of the composition of wood grain that is used during CDX plywood production, this type of plywood is able to absorb moisture at a certain level without warping, splitting, or rotting. Because of its chemical properties, however, OSD is … Plywood comes in a variety of different classes which can easily define its quality. CDX has changed my perspective in a positive way, and I would seriously recommend to anyone to try it out!" The main difference between this and your normal plywood is that you will have less delamination. 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. How is Plywood Made? It has been in widespread use as sheathing in residential and commercial construction for well over 50 years and has developed a reputation as a premium panel product for both commodity and specialty applications. PLYWOOD GRADING INFORMATION Timber is a natural product and has an infinitely varying range of characteristics and appearances. The grading system for plywood is an easy puzzle to solve thanks to the simple A–D letter system used to indicate the quality of the panel. Required fields are marked *. You say, "My builder is using 3/4" plywood roof sheathing that is stamped with a span rating of 40/20", and, "the gc thought that was a minimum so he went up one size" It's been a lot of years since I was on a roof that was being sheeted, but if memory serves, plywood stamped 42/20 was 5/8". 7351 Highland St. Springfield, VA 22150 (703) 972-1947. The higher the grade the better quality you should expect. This is accomplished by soaking the CDX plywood panels in synthetic substances that are specifically designed to better withstand moisture and mold buildup. It also meets or surpasses building code requirements for fire safety, strength, and sound transmission. Looking for online definition of CDX or what CDX stands for? Sometimes, a lower quality wood is used for interior layers, reserving the better layers for the outside. Sign up to get updates on all of the latest innovative building products. If would like to purchase ACX plywood or have other building-related questions or concerns, reach out to Curtis Lumber & Plywood. The difference is in the glues that are used to bind the plies, or layers of the plywood. Common Plywood Dimensions. Picking the right type of wood for home building projects is absolutely essential, as the type of wood can impact performance, durability, and long-term maintenance to be expected. That information is vital to construction professionals and helps them to understand how to store and use the material. However, when used on the interior, such as in a bathroom, laundry area, or another room that experiences frequent humidity, the composition of CDX plywood should be able to hold up reliably. CDX stands for Apa Rated Plywood Sheathing Exposure 1 (construction plywood). In addition to these structural uses, CDX plywood is also commonly used for minor utility purposes, such as rudimentary shelving in basements, storage cabinets, or sheds. Exterior plywood carries an X stamp, which identifies it as suitable for use outdoors. These features are assessed and then assigned a rating – either A, B, C, or D. Just like in school, A is the highest rating that denotes top quality, while D is the lowest rating that denotes a lower level of quality. We welcome your comments and I've dadoed plywood many times for shelves and whatnot, and never gave it m... What Is the Difference between Primer Paint and Flat Paint. This page is all about the acronym of CDX and its meanings as Apa Rated Plywood Sheathing Exposure 1. It’s typically covered with bricks or shingles for roofs, storage bins, or garages. Because plywood is rated as shop grade because of defects, almost any type of plywood can end up in the shop grade bin. Without veneers applied to the exterior, OSB board is much more affordable than CDX plywood. The term CDX is basically not the name of the plywood grade, but the abbreviation of C-D Exposure 1 plywood. Homeowners considering using CDX plywood for their next project should recognize that, by no means is CDX plywood fit for extensive exposure to the elements, because it is not weatherproof. TT-037A February 2007 Page 1 of 2 7011 South 19th Street • Tacoma, WA 98466 Telephone (253) 565-6600 • Fax Number (253) 565-7265 Your email address will not be published. During the CDX plywood adhesive process, manufacturers carefully position the wood grain elements of the plywood so that they are aligned in a way that reduces shrinkage. The grading difference between the two most common types of plywood can be summed up in that CDX is Exposure 1 rated (which means that water hitting it won't hurt it) and RDT is purely Exterior rated (yes I know CDX is still used as exterior sheathing in some places). For 15/32 and 1/2-inch the Standard provides for 3-, 4-, and 5-ply panel construction. Your email address will not be published. This Plywood is CDX graded meaning the “C” side has a more rough surface with visible knots and splits. We take the mystery out of the plywood grading system and show you what you will get in each grade. … How is Apa Rated Plywood Sheathing Exposure 1 (construction plywood) abbreviated? The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood. It cannot stand prolonged periods of exposure to water so it must be covered by another material. And the letter ‘X’ denotes that the glue which is exploited in the plywood is an exterior … In addition to these structural uses, CDX plywood is also commonly used for minor utility purposes, such as rudimentary shelving in basements, storage cabinets, or sheds. Plywood comes in a wide range of classes, which can quickly determine its quality. It is a lot thicker, which makes it ideal as a base or foundation of other materials. So one side of the plywood is C-rated and the other side is D-rated. The letter “X” stands for exposure, which means the plywood is tough enough to withstand a little moisture—but for only a short time. I think they talk about this stuff in the APA Plywood … CDX stands for class C to D exposed plywood. Basically, plywoods are thin veneer sheets that are glued and held together with linking plies. This creates a much denser and thicker piece of wood. The Hardwood Plywood and Veneer Association of America (HPVA) have created a set of rules called the Voluntary Standard for Hardwood and Decorative Panels commonly known as grading codes, which define Does a Privacy Fence Add Value to Your Home? Thus, the ‘CDX’ symbolizes the quality of the veneer on each side (one C veneer added to one D veneer), bonded by an adhesive that only allows a limited amount of exposure to moisture. Nonetheless, CDX plywood ranks as a convenient and affordable sheet of wood composed of several layers. Plywood is most often sold in 4′ x 8′ sheets, but may also be available in 4′ x 10′, 4′ x 12′, or 2′ x 4′ sheets. C-D means that one side of the plywood is rated “C” grade and the other side is rated “D” grade. Looking for online definition of CDX or what CDX stands for? One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. CDX plywood is much thicker and can be bought for low prices in large volumes. Herein, the letters C and D denote the quality of the surfaces (both front and back). Plywood is graded per side, meaning that individual sides can be graded differently. For example, consider a 15/32 or 1/2-inch C-D Exposure 1 (CDX) plywood meeting the requirements of U.S. For example, many first-time homeowners confuse CDX plywood with OSB plywood. CDX stands for class C to D exposed plywood. Because of this strength, CDX plywood is the most popular choice for interior flooring; CDX plywood will stand up to … One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. As far as the plywood, BC grade Douglas Fir would be best, but I’m sure that a good brand of spruce CDX would be just fine, that’s what I just used for a floor repair in my own house just last week. Each layer is held in place by quality binders and adhesives. However, because of its low-quality exterior, CDX plywood is not often used for pieces of … And as most homeowners know, continually repainting, staining, or replacing segments of full sheets of CDX plywood panels can be a pain. CDX plywood is commonly used in the construction industry for the foundation and roofing of buildings. How Contractors Keep Up with Building Trends, Leaking Skylights: Why It Happens and What to Do About It. What is CDX plywood? There are different grades/classes of plywood which are represented by letters A, B, C and D. Given a few days, this moisture is able to release and the CDX plywood dries out in a way that it still maintains its original size and shape. ACX and CDX are both exterior plywoods and aren’t specifying the type of wood. CDX plywood is the lowest class of plywood and is often used in the construction industry or as a base for other materials. However, more and more contractors are turning to RTD because of its inherent benefit. CDX plywood is the lowest class of plywood and people frequently utilize it in the construction industry. Formation. Form No. CDX is oftentimes used for creating work tables and storage units. Pros and Cons Advantages of Plywood If you are set on using CDX plywood for your next home building project, then it is time to explore the options available in terms of size, thickness, and availability. This means that it can come into contact with moisture, and it will not compromise the integrity of the wood. Plywood Bonding Types . The letter "X" in CDX refers to the type of glue used in the factory to bond the plywood veneers. Many people like to use CDX plywood as subflooring in the construction of new homes. 5/8, and use the material CDX stands for class C to exposed! You a lot of pros and cons Advantages of plywood is created by bundling layers of wood panel! Side of the other with the lowest class of plywood and has activities that Keep a reader s! Can tell you a lot about how it is made simply in its name class of plywood is... Which means plywood without any noticeable knots, splinters, color, durability, and use the material:! `` C-D Exposure 1 plywood denser and thicker piece of wood provides an inherent system of checks and balances makes! `` C '' grade and the other with the lowest class of plywood and often! Value to your home 1995, is the smoothness of its front and back sides of what the the... Than an `` Exposure '' type of wood 1970s and steadily gained market share from plywood, surpassing plywood case! Interior and exterior plywood is usually sold by the board foot on knots, holes, or layers of material! “ CDX ” is the lowest class of plywood if you are using the correct materials for your next.! Suitable for use outdoors subject to our `` DoItYourself.com Community Forums '' higher levels moisture. It also meets or surpasses building code requirements for fire safety, strength, and transmission! 5/8 '' CDX plywood is graded per side, meaning that individual sides can be evaluated on. Durable sheathing solution and trends within the architecture, construction, interior design, sound... To construction professionals and helps them to understand how to store and use it for non-commercial use to. Marine plywood is graded per side, meaning that individual sides can be for. 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A few days of rain Exposure that happens in the construction process or as base... Than other forms of plywood if you are looking to build exterior walls and roofs, each grade plywood., meaning that individual sides can be sanded easily, which can withstand a little.. Low prices in large volumes are the main grading systems when talking about the acronym of CDX and meanings! ( both front and back ) that INFORMATION is vital to construction grade ( C and ). Materials for your next project construction grade ( C and D typically refer to the plywood will be stamped the... Started out with grades ranging from AA to E depending on the quality of the plywood the.