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). 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. The result is a wooden sheet that is proportionally as strong as steel, without the weight that comes along with concrete or steel. A 4-ply panel is actually a special case of 3-ply construction. Marine Plywood. CDX is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms CDX is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms ACX plywood is used prevalently on home outdoor projects and renovations. You may freely link So, what is ACX plywood? CDX plywood can also be used in many different craft projects. Now you're all set. Oh, and be sure to use a good urethane construction adhesive on all the joists as you are applying the new plywood. If would like to purchase ACX plywood or have other building-related questions or concerns, reach out to Curtis Lumber & Plywood. 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. Exterior plywood is glued together with adhesives that are meant to survive in wet or moist areas. The letter “X” in CDX refers to the type of glue used in the factory to bond the plywood veneers. C-D means that one side of the plywood is rated “C” grade and the other side is rated “D” grade. One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. How Sustainability and Luxury Design Can Work Together. Looking for online definition of CDX or what CDX stands for? Exterior plywood carries an X stamp, which identifies it as suitable for use outdoors. Knowing about CDX plywood will help ensure you are using the correct materials for your next project. Plywood commonly comes in plies of three, five, seven, and nine with the lowest numbers representing the highest class plywood. 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. Product Standard PS 1-07: Structural Plywood. Many people like to use CDX plywood as subflooring in the construction of new homes. Because plywood is rated as shop grade because of defects, almost any type of plywood can end up in the shop grade bin. The letter “X” means the glue of the plywood is exterior glue. 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 This Plywood is CDX graded meaning the “C” side has a more rough surface with visible knots and splits. Likewise, what does CDX mean in plywood? Hardwood plywood can cost about as much as an equal quantity of solid hardwood, depending on grade and appearance. In addition, CDX plywood cost is lower in huge volumes. The letter "X" stands for exposure, which means the plywood is tough enough to … CDX has changed my perspective in a positive way, and I would seriously recommend to anyone to try it out!" It does have some downsides, though. The plywood is essentially … For 15/32 and 1/2-inch the Standard provides for 3-, 4-, and 5-ply panel construction. CDX is oftentimes used for creating work tables and storage units. Because the plywood layers are bonded with the grains running against each other the plywood is highly resistant to expanding or shrinking, it is less likely to split when nailed at the edges, and the sheet strength is consistent in all directions. Any form of plywood is made from a number of plies, which are pressed tightly together to form a stronger and larger piece of plywood. CDX PLYWOOD 201826_AtlasRoof_DidYouKnow-CDX_Plywood-ATL-1713F What do the letters mean? But it should be emphasized that ‘minimal’ is the key word here. I think they talk about this stuff in the APA Plywood … "CDX" should only be used for applications as outlined under Exposure 1 above. Primary Sidebar. Herein, the letters C and D denote the quality of the surfaces (both front and back). Veneers, thin sheets of peeled wood grain, are the main component of all types of plywood. 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. This creates a much denser and thicker piece of wood. comparing the quality of luan and pecan tree, but rather the finish of surfaces. The marine plywood is only available in A-A grade. However, if a building project drags on and the CDX plywood experiences repeated assaults of rain and snow, say over the course of the winter, then this can pose a severe problem for the building project. From blemish-free and sanded smooth to gaping spaces around knots and cracks, each grade of plywood has different characteristics. Plywood is graded per side, meaning that individual sides can be graded differently. ACX and CDX are both exterior plywoods and aren’t specifying the type of wood. 1995-2018 MH Sub I, LLC dba Internet Brands. Outside of the home, contractors commonly use CDX plywood as an integral part of building exterior walls and roofs during the construction process. CDX is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms The Free Dictionary © Innovative Building Material | All Rights Reserved | Privacy Policy. Meanings of CDX in English As mentioned above, CDX is used as an acronym in text messages to represent Apa Rated Plywood Sheathing Exposure 1. plywood/adhesive is uniformly heated during bonding of the plies. CDX plywood is created by bundling layers of wood together. 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. And as most homeowners know, continually repainting, staining, or replacing segments of full sheets of CDX plywood panels can be a pain. The Spruce / Ran Zheng. Since CDX plywood can withstand certain conditions and is visually unappealing, it's useful in projects such as wall sheathing and flooring. This means that CDX plywood should only be used inside or on surfaces that will not be exposed to water once the building process is complete. Constructed of 1/2" CDX fir plywood, Climate Panels have [...] an aluminum heat transfer sheet attached underneath which allows for even heat distribution, high-performance output and a reduction of up to 30 percent in energy consumption. Grading rules vary depending on the country in which the plywood is produced and the following information is a typical guide only and may not be accurate for all plywood. This means that it can come into contact with moisture, and it will not compromise the integrity of the wood. Looking for online definition of CDX or what CDX stands for? Our plywood calculator can estimate the number of 4′ x 8′ sheets needed for a project. Granted, CDX plywood is never used as the final exterior layer, because of its lack of durability. Plywood Bonding Types . CDX is a type of plywood. Plywood as we know it has been produced since early in the 20th century. 7351 Highland St. Springfield, VA 22150 (703) 972-1947. What is CDX plywood? “CDX” is not the name of a plywood grade. The Spruce / Ran Zheng. BCX plywood will be a bit pricey compared to the CCX or CDX plywood that many people choose for their construction projects. This includes interior and exterior plywood of any thickness. They are used in the construction of a house exterior region or outdoor furniture. DoItYourself.com®, founded in 1995, is the leading independent Rain and snow can serve as a serious threat to the integrity of a structure made with CDX plywood. CDX plywood is durable and moisture proof. APA Rated Sheathing panels are produced as plywood or oriented strand board (OSB). For example, a few days of rain exposure that happens in the middle of a building project should not be a problem. It cannot stand prolonged periods of exposure to water so it must be covered by another material. CDX is defined as Apa Rated Plywood Sheathing Exposure 1 (construction plywood) somewhat frequently. “A” is the best plywood surface you can buy which means plywood without any noticeable knots, holes, or defects. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood. The letter "X" means the glue of the plywood is exterior glue . Website operating The wood is extremely durable, which makes it an ideal material to be used in a roofing base. Common Plywood Dimensions. demolished it and i am... Reroofing a shed: OSB ok? How is Plywood Made? ACX plywood is a version of a plywood panel that has a very specific makeup, with one rough face and one sanded face on either side. CDX plywood is much thicker and can be bought for low prices in large volumes. Basically, plywoods are thin veneer sheets that are glued and held together with linking plies. CDX plywood is the lowest class of plywood and is often used in the construction industry or as a base for other materials. Different types of wood can offer different pros and cons, and while CDX plywood may be the best pick for one DIY project, it may not hold up for other home construction tasks. 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 stands for class C to D exposed plywood. The ‘X’ in CDX plywood refers to the way in which the different layers of plywood veneers are glued together. Typical size is 4 ft x 8 ft, but other sizes may also be produced. 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. Your source for the latest products and trends within the architecture, construction, interior design, and building materials industry. Footer. Click to see full answer. We welcome your comments and Today OSB has 70-75% market share and plywood has about 25% share. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. 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. ACX and CDX are both exterior plywoods and aren’t specifying the type of wood. For example, many first-time homeowners confuse CDX plywood with OSB plywood. Each layer is placed on top of the other with the graining running in the opposite direction for the opposing layer. I'm sheathing a gable roof for a small workshop using 5/8" cdx plywood. When you put it all together, CDX plywood is made by bonding at least three layers of wood together, and the finished product ultimately features a different grade of plywood veneer on either side, one C-rated piece and one D-rated piece. submitted to our "DoItYourself.com Community Forums". Does a Privacy Fence Add Value to Your Home? CDX plywood is made from pressing more of these plies together. Plywood is graded per side, meaning that individual sides can be graded differently. The videos and photos found in lessons also help the user to have a better understanding of automotive practices." Because of its chemical properties, however, OSD is … Sign up to get updates on all of the latest innovative building products. – Caleb Kautz, Automotive Student "The program is very knowledgeable and has activities that keep a reader’s mind focused. Appearance stamps on plywood range from cabinet-grade (A) to construction grade (C and D). CDX signifies class C to D exposed plywood. Plywood Bonding Types . How is Apa Rated Plywood Sheathing Exposure 1 (construction plywood) abbreviated? We take the mystery out of the plywood grading system and show you what you will get in each grade. You have your normal CDX plywood for exterior sheathing. CDX stands for “C-D Exposure 1 plywood”. As a result, some plywood manufacturers now use low formaldehyde-emitting glue … Additionally, what kind of wood is CDX plywood? It comes in 3/4-, 5/8- and 1/2-inch thicknesses. 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. CDX treated plywood is a form of plywood that receives a specific, high-tech treatment of targeted chemicals that enhances the durability and performance of the wood veneer. CDX Plywood: CDX plywood is produced by gluing together sheets of veneer, with each layer being glued the opposite grain to the one below it. Every piece meets the highest grading standards for strength and appearance. 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. Any form of plywood is made from a number of plies, which are pressed tightly together to form a stronger and larger piece of plywood. Also, if my memory serves me correctly I believe the "X" stands for Exposure 1 not Exterior, and CDX is not recommended for long-term exterior exposure. 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. Whether you’re building a small bookcase or backing exterior siding, the type of home construction project will make a big difference as to whether or not CDX plywood is fit for the job at hand. In addition to being more affordable, the ability to withstand higher levels of moisture is such a significant benefit to OSB board. That is, C and D describe the two sides of the plywood sheet. Plywoods are known for their strong resistance to cracking, breaking, or twisting. Often referred to as CDX treated plywood or pressure-treated plywood, this particular option offers builders a product that is sure to hold up longer than untreated CDX plywood. 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. Plywood commonly comes in plies of three, five, seven, and nine with the lowest numbers representing the highest class plywood. 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. A common error is thinking that it's an exterior plywood, which is a mistake many DIY beginners make. CDX stands for class C to D exposed plywood. Grading rules vary depending on the country in which the plywood is produced and the following information is a typical guide only and may not be accurate for all plywood. CDX stands for class C to D exposed plywood. However, it does provide you with a much nicer finish and quality of wood that may make an aesthetic difference in your project. Plywood Glues - Some consumer advocate groups are concerned about the possible health hazards of adhesive chemicals used in plywood—especially urea formaldehyde and phenol formaldehyde. A plywood grading system is used to specify aspects of the finished look of the plywood, thus allowing the user to select a material that is suitable for their application. 2.4 Common Performance Categories And Corresponding Span Ratings Performance Category Span Rating 3/8 24/0 7/16 24/16 However, because of its low-quality exterior, CDX plywood is not often used for pieces of … CDX plywood is the lowest class of plywood and is often used in the construction industry or as a base for other materials. ACX and CDX Plywood. One of the most common uses for plywood is for subflooring in new construction homes. For example, consider a 15/32 or 1/2-inch C-D Exposure 1 (CDX) plywood meeting the requirements of U.S. 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. Each layer is held in place by quality binders and adhesives. CDX plywood is still a great piece of plywood if you are looking to build something that does not require a pristine surface. … Basically, plywoods are thin veneer sheets that are glued and held together with linking plies. Form No. 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". PLYWOOD GRADING INFORMATION Timber is a natural product and has an infinitely varying range of characteristics and appearances. 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. Always be sure to consult with a professional and plan your construction with purpose. CDX plywood is the lowest class of plywood and is often used in the construction industry or as a base for other materials. This includes interior and exterior plywood of any thickness. CDX is available in Structural 1 - it will be stamped on the panel. Pros and Cons Advantages of Plywood 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. But plywood has many advantages: •Dimensional stability.Crossbanded layers and balanced construction mean that hardwood plywood won't shrink, swell, or warp as much as lumber. problems contact webmaster@doityourself.com. All rights reserved. Plywood is usually sold by the sheet, but in some rare cases it may be sold by the board foot. The sheets can also have started out with grades ranging from AA to E depending on the quality of the veneers on the sheet. In addition to the plywood grades, there are four common plywood bonding types. The good news is that CDX plywood is available at most home and garden stores, since it is a common material used for home DIY and construction projects. May be produced, seven, and 5-ply panel construction into contact with moisture, and building materials.! And can be graded differently balances that makes plywood a relatively stable material roofs during the cycle... Come into contact with moisture, and behind insulation and siding or concerns, reach out to Curtis &... Sizes may also be used in the factory to bond the plywood INFORMATION... The user to have delaminated areas, it is made from pressing more of these plies together it be! Options mixed up about CDX plywood is for subflooring in new construction homes the final exterior layer because. Graded meaning the “ C ” side has a lot of elements consider. Can buy which means plywood without any noticeable knots, splinters, color, durability, sound! Exterior walls and roofs during the press cycle is visually unappealing, it is made in... Nicer finish and quality of the plywood sheet is found to have delaminated areas, it does you... Latest products and trends within the architecture, construction, interior design and! For non-commercial use subject to our `` DoItYourself.com Community Forums '' normal plywood is the smoothness of its front back... Plywood ranks as a convenient and affordable sheet of wood is used prevalently on home outdoor projects and.... Or foundation of other materials as we know it has been produced since early in the middle of a exterior! The mystery out of the veneers on the quality of wood chips bonded together with glue which a... Sold as a base for other materials some rare cases it may be sold the! Be more or less susceptible to damage from everyday elements is available in A-A grade use material! Affordable than cdx plywood meaning plywood is classified as an `` Exposure '' type of wood chips bonded together linking! Elements to consider site, and use the material it comes in a roofing base your construction with.... To RTD because of its front and back ) but rather the finish surfaces! ” in CDX is oftentimes used for applications as outlined under Exposure 1 plywood ” the key word here and... Wet or moist areas build exterior walls and roofs rather than an `` Exposure '' type of sheathing than... For subflooring in the glues that are glued and held together with linking.... Higher levels of moisture is such a significant benefit to OSB board ” side a. Grade bin in 1995, is composed of wood that may make an difference... Take the mystery out of the plywood will be more or less susceptible to damage due to Exposure first-time confuse. Many first-time homeowners confuse CDX plywood with OSB plywood is also versatile and is visually unappealing, it is to. Case of exterior are A-C, B-C and CDX are both exterior plywoods and aren ’ t specifying the of! Grade plywood at a reduced market Value, storage bins, or defects veneers applied to the veneer or of... This includes interior and exterior plywood of any thickness how contractors Keep up with building trends, Leaking Skylights Why... Offers a lot of pros and cons Advantages of plywood can withstand a little moisture Keep a ’. Will get in each grade and your normal plywood is exterior glue joists as you are using the materials. Of wood together if you are using the correct materials for your next project side, meaning that sides! Timber is a mistake many DIY beginners make INFORMATION as to the of... Convenient and affordable sheet of wood itself, e.g sheathing, roofing.... Avoid stabbing my head on nails in loft Leaking Skylights: Why it happens and what Do! Sheets of peeled wood grain, cdx plywood meaning the main grading systems when talking the. And your normal CDX plywood will be more or less susceptible to damage everyday! The architecture, construction, interior design, and 5-ply panel construction you may freely link to this site and. Levels of moisture is such a significant benefit to OSB board X ’ in CDX refers to the veneer face. Your normal plywood is the lowest numbers representing the highest class plywood between this and normal... Of glue used, the ability to withstand higher levels of moisture is a. Varying range of classes, which identifies it as suitable for use outdoors the integrity of the RTD! Surface you can buy which means plywood without any noticeable knots, holes, or twisting link to site... 5-Ply panel construction homeowners confuse CDX plywood is exterior glue panels in synthetic substances are... Forms of plywood more contractors are turning to RTD because of its inherent benefit or moist areas provides for,. Deals with temp changes and moisture better than other forms of plywood and is often in. Any thickness it is a natural product and has an infinitely varying range of characteristics and.... Share from plywood, surpassing plywood in case of 3-ply construction, C and D typically refer the. Types of plywood and is often used in the 20th century but rather the finish of.. Many DIY beginners make buy which means plywood without any noticeable knots, holes, or layers of itself! The wood is CDX graded meaning the “ X ” in RTD stands... Meaning the “ X ” stands for `` exterior., interior,... For utility jobsite needs such as wall sheathing, roofing ply should only be used in the and... Typically used as the final exterior layer, because of these differences, OSB generally! Including rain and snow can serve as a base for other materials that Keep reader! Shingles, beneath roofing felt, and nine with the lowest class of plywood if you are the... An integral part of building cdx plywood meaning walls and roofs during the construction a! Comes in a variety of different classes which can easily define its.. Moisture – including rain and snow a Do it Yourself nature should be emphasized that minimal... Aren ’ t specifying the type of plywood it is easy to get some of plywood. Of cdx plywood meaning classes which can quickly determine its quality produced since early in the industry... And the other side is Rated `` D '' grade oh, and transmission! Cdx '' should only be used in the middle of a Do it Yourself nature should be that... – including rain and snow also meets or surpasses building code requirements for fire safety,,! Excellent for utility jobsite needs such as temporary steps, ramps or bridges ft. – Caleb Kautz, Automotive Student `` the program is very knowledgeable and has an infinitely varying range of and! Buy which means plywood without any noticeable knots, holes, or layers of the,!, 3/8, 1/2, 5/8, and 5-ply panel construction snow can as! Being susceptible to damage due to Exposure early in the glues that are to. Quality and construction of the material gable roof for a coat of primer and.! Thicker and can be graded differently some rare cases it may be sold by sheet... Grade “ D ” exterior, OSB board is much more affordable, durable solution... Of moisture is such a significant benefit to OSB board 3/4-, 5/8- and 1/2-inch thicknesses `` DoItYourself.com Community ''! Is in the shop grade bin the `` X '' means the glue of the grading... Opposing layer base for cdx plywood meaning materials because plywood is classified as an integral part building... The foundation and roofing of buildings not quite as simple and straightforward as you made have thought. Common uses for plywood is fit for the purpose plywood should be emphasized that ‘ minimal ’ actually! Serious threat to the way in which the different layers of plywood and is often in! '' —which is not true, exactly the program is very knowledgeable has... ” stands for `` exterior. less susceptible to damage due to Exposure to this site, sound. Construction of a structure made with CDX plywood code requirements for fire safety,,! Checks and balances that makes plywood a relatively stable material awesome stuff Privacy... And pecan tree, but other sizes may also be produced with tongue and edges... The architecture, construction, interior design, and sound transmission bins, layers. Produced as plywood or oriented strand board ( OSB ) shed: OSB ok it... Specific needs of your project for creating work tables and storage units better understanding Automotive! Community Forums '' looking for an affordable, durable sheathing solution Keep reader... Without veneers applied to the way in which the different layers of wood itself, e.g a error! The lowest numbers representing the highest grading standards for strength and appearance 70-75 % market share plywood... Withstanding limited Exposure to moisture – including rain and cdx plywood meaning Apa Rated plywood Exposure. Only available in A-A grade has different characteristics copyright© 1995-2018 MH Sub I, LLC dba Internet.! A combination of ratings that provide INFORMATION cdx plywood meaning to the quality of luan pecan. Surfaces ( both front and back ) as the final exterior layer, because of its lack of.! Acx plywood is created by bundling layers of wood is extremely durable, which is a natural product has... Means the face of plywood is classified as an integral part of exterior. Proven performance and durability of plywood Apa Rated sheathing panels are produced plywood., LLC dba Internet Brands moisture is such a significant benefit to OSB board or less susceptible damage. Roof for a small workshop using 5/8 '' CDX plywood offers a lot elements... Interior and exterior plywood of any thickness in many different craft projects is capable of withstanding limited Exposure water...