Most construction sites will consider the use of either OSB or plywood for the roof. 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. In such places, it does not get in contact with a lot of moisture, which prevents it from getting damaged. CDX sheathing is used primarily by contractors to build exterior walls and roofs. But when you want to install just about anything else, the manufacturer wants you to use something smooth on the top and no voids between layers. We’ve used 1/4″ underlayment as faux shiplap before and were happy with the results. For a decking, or substrate underneath shingles, you can usually use either material. CDX plywood is an exterior grade plywood only in the sense of considering the adhesive used for connecting the veneer plys. OSB takes longer than plywood to get saturated, but also takes much longer to dry out. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. 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. When used as roof sheathing, this tendency to hold moisture means it will degrade faster than plywood when exposed to chronic leaks. CDX plywood is pretty crappy stuff. Most is graded A-C, B-C, or C-D, although many retailers will refer to grade C-D as 'CDX.' Pressure-treated exterior plywood can be identified by its oily surface. Each section of exterior plywood is assigned two letter grades—one for how it looks on the front and one for how it looks in the back. The Spruce / Ran Zheng. CDX plywood is the lowest class of plywood and is often used in the construction industry or as a base for other materials. "CDX" should only be used for applications as outlined under Exposure 1 above. 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: 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. How to build CDX Plywood Shelf CDX plywood used for constructing shelves should be created a bit longer to enhance its capacity to hold the maximum load. The term plywood could accurately be used to describe a variety of materials including particleboard, medium density fiberboard, chipboard or hardboard. It normally comes in piles of 3, 5, 7, 9, and the lowest number indicates the uppermost class of a CDX plywood. The grade helps the home owners to decide which exterior plywood they will need for their particular project. One of the nice things about plywood is the variety of options you can buy. CDX Plywood is used primarily by contractors to build exterior walls and roofs. 3/4" CDX square edge could be used for the subfloor only if a T & G underlayment is used on the top. When most people hear the term plywood, they think of CDX (or whatever.) The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood. 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. I used a lot of plywood for underlayment during my installation years. It can withstand moisture for a brief period of time but may become warped … Sanded Pine: Sanded pine is a versatile plywood … ACX plywood is a version of a plywood panel that has a very specific makeup, with one … CDX stands for "C-D Exposure 1 plywood" . The bottom line is that there is a plywood for almost every application. No Water resistent?? Plywood is generally available in 4’x8′ sheet and is cut into a square board. 1/2″ plywood is used for building furniture parts, boxes and props. In this case, plywood has the edge. crossband offers a much smoother face as compared to white fir, douglas fir, . which is used to build houses. CDX is the most common exterior plywood grade.It comes in 3/4-, 5/8- and 1/2-inch thicknesses. In addition to the plywood grades, there are four common plywood bonding types. The veneer grading is the same as with "AC," where "D" permits knots up to 2-1/2 inches wide, and splits and repairs are noticeable throughout the plywood surface. CDX plywood is much thicker and can be bought for low prices in large volumes. Use 3/4 inch CDX pressure treated plywood for the floor. Plywood Bonding Types . Plywood quality is ranked by letters of the alphabet, with "A" being the best ranking. 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