Waterproof?? CDX plywood is pretty crappy stuff. Use 3/4 inch CDX pressure treated plywood for the floor. One of the nice things about plywood is the variety of options you can buy. comparing the quality of luan and pecan tree, but rather the finish of surfaces. 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 are both exterior plywoods and aren’t specifying the type of wood. The letter "X" means the glue of the plywood is exterior glue . Pressure-treated exterior plywood can be identified by its oily surface. Each of these materials has its own unique properties and qualities, and so each is used … Plywood is a common example of a formaldehyde-based product. CDX sheathing is used primarily by contractors to build exterior walls and roofs. This provides an inherent system of checks and balances that makes plywood a relatively stable material.Each layer is held in place by quality binders and adhesives. It’s solid, won’t sag, and protects the substructure and is easy to sweep. That ain't CDX. The wood isn’t pressure treated or treated in any other way to make it waterproof , unless it is marked as being “pressure treated” plywood. CDX is the most commonly used plywood. Most construction sites will consider the use of either OSB or plywood for the roof. It is the right choice for several home style DIY projects for its durable, inexpensive and resistant nature. CDX plywood used for constructing shelves should be created a bit longer to enhance its capacity to hold the maximum load. Conversely, construction-grade plywood would be C-D (commonly referred to as CDX plywood), which is great for structural use but not suited to be finish material. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood. Plywood is a powerful structural product Plywood is a powerful structural product used where strength and stiffness are required for subfloors, wall or roof sheathing and do-it-yourself projects. They are widely used in the construction industry and for the roofing of buildings. This won’t imply the actual quality of wood itself, e.g. One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. Regardless, we knew we wanted to use 3/8″ exterior plywood, also known as CDX plywood, instead of luan underlayment when we were ready to plank our bathroom walls. Keep the “D” side (the side with more imperfections) facing down. CDX plywood is much thicker and can be bought for low prices in large volumes. It can withstand moisture for a brief period of time but may become warped … They are coated to prevent them from being eaten by the copper in the pressure treated solution. Works okay if all you're installing is carpet or 3/4" hardwood. There are pressure treated grades, marine grades that can be used in water, fine hardwood options for finish work and cabinetry, pre-finished panels, or simple down and dirty 1/2″ CDX plywood. "CDX" should only be used for applications as outlined under Exposure 1 above. 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. The bottom line is that there is a plywood for almost every application. It’s usually covered with bricks or shingles for roofs, garages, or storage bins. Yes CDX Plywood - What Does the "X" Really Mean? The Spruce / Ran Zheng. CDX is a exterior grade, not designed for a sub-floor span. I used a lot of plywood for underlayment during my installation years. In such places, it does not get in contact with a lot of moisture, which prevents it from getting damaged. 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. CDX plywood is a construction-grade type of plywood that is designed for exposure to the elements. CDX is the most common exterior plywood grade.It comes in 3/4-, 5/8- and 1/2-inch thicknesses. Some people think that “X” stands for the exterior but it is not true. The plywood variant is used for a number of applications including shelving. The thickness of plywood normally used is 1/8″, 1/4″, 1/2″, and 3/4″. This type of plywood can also be called common pine sanded plywood. Some areas will use the T & G sturdie floor 23/32" rated plywood, but nothing else for an underlayment. Use a preservative, like Coppercoat, to protect the cut ends from moisture and insects. Hold the maximum load fir, the exterior but it is not true creating. Or C-D, although many retailers will refer to grade C-D as.! 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