Pressure-treated plywood, which is saturated with chemicals to ward off mold, mildew, and insects, can survive outside for decades without paint or a protective finish. This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. Correction to this wood product problem can clean your wallet. - FSC certified. Even though plywood is more expensive, and OSB stronger, my recommendation for a shed roof is 5/8â or 3/4â³ construction-grade exterior rated (CDX) T&G plywood. It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. Both CDX plywood and OSB have advantages and disadvantages when it comes to plywood for roofing. CDX is best for sub-flooring. CDX Plywood. Most construction sites will consider the use of either OSB or plywood for the roof. CDX is veneer plywood. - Water Boil Proof (WBP) - Ideal uses Flooring, Roofing, Shuttering. Plywood is graded per side, meaning that individual sides can be graded differently. As a quick primer in plywood, each side is rated from A to D. A is smooth and knot-free while D, the lowest quality, has missing knots and cracks. Both CDX plywood and OSB have advantages and disadvantages when it comes to plywood for roofing. High quality CDX sheathing manufactured from soft spruce wood. Before you can really grasp the different ways to use CDX plywood vs. OSB, it can help to have a better understanding of what each of them is. Some professionals, however, will use plywood as thin as 1/4 inch for resilient flooring if the subfloor is in particularly good condition. CDX; This option is basically a specialized plywood grade. Plywood. However, you might find that OSB can better suit your needs than plywood for the roof. Depending on thickness, plywood is also approximately two pounds or more lighter per sheet. 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. CDX plywood is commonly used in the construction industry for the foundation and roofing of buildings. Another issue that many people encounter is what size plywood the roof may need. Differences Between OSB and CDX For Roofing Plywood. What is OSB? Water Boil Proof (WBP)- Ideal uses Flooring, Roofing, Shuttering. Be careful not to confuse the words “outdoor,” “exterior,” and “pressure treated” to all mean the same thing. The letter "X" means the glue of the plywood is exterior glue . The higher the slope, the more quickly the snow and rain will be shed, but also the greater the wind force. The alternating grain gives the plywood a system of checks and balances that allow it to expand and contract evenly across the sheet. The letter “X” stands for exposure, which means the plywood is tough enough to withstand a little moisture—but for only a short time. However, you may need to consider bolstering the plywood thickness for a roof that has a higher load. 1/2" x 4' x 8' 4-Ply CDX Plywood Item #: 271066 Manufacturer #: PLY 1/2. Press Esc to cancel. CDX plywood has one side veneer grade âCâ and one side veneer grade âDâ. However, when it is penetrated by water, it takes a very long time to finally dry out compared to CDX plywood. Combustible Wood Deck UL Class A Assemblies. As a result of this strength, CDX plywood â¦ Moisture Differences. Building codes recognize both plywood and OSB to be alike in their properties and use the phrase \"wood structural panel\" to describe them.However, plywood subfloors are stiffer than OSB by about 10%. Both OSB and plywood for the roof have been approved for use, so it may come down to what you feel most comfortable using. Uses. Our CDX sheathing is available in a selection of thicknesses, and can â¦ Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. 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. Email This BlogThis! It is usually made of 4â² by 8â² sheets that should be 1/2â³ thick. These tips cover plywood characteristics and proper installation of plywood. I would argue that plywood isnât used for roofing, but for decking the roof prior to installing the actual roofing material. CDX plywood is created by bundling layers of wood together. The highest quality—and most expensive—types of plywood are the A & B grades. Although it's easy to find at your local home center, it's probably not the best choice for smaller projects, like a bookshelf or other furniture around the house. The two are bonded together with glue which can withstand a little moisture. Alternatively, OSB is created from wood chips, resin, and adhesive that is baked and formed into the shape of a sheet of plywood. If plywood is not dealt with properly, it can swell and create major problems with roofing, flooring or siding. Given that the edges may swell with exposure to moisture, you may prefer to use these larger panels to minimize the number of edges along the roof. It also holds roofing nails well. Comes in standard 4-by-8-foot sheets, is strong, durable, and relatively light. CDX plywood is used as flooring materials, wall sheathing, roofing ply . 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. It determines how long your roof will last and how well it will protect the contents of your home. Manufactured by sticking together sheets of veneer, CDX plywood is also a popular choice. Rated sheathing, also known as CDX in the trade; For use in general construction; Exposure 1 rated panel can withstand inclement weather during construction delays but is not intended for extended exposure to the elements; Sized for spacing (Panel width and length may vary up to 1/8" to aid with proper installation) CDX plywood is durable and moisture proof. CDX plywood sizes are typically available in sizes 3, 5, 7, and 9, and there are a variety of thicknesses available, ranging from 1/4 inch to â¦ A final mark to check is the thickness of the plywood. Be sure to weigh the advantages and disadvantages of each option before you decide which way to go for your new home or your updated roof. CDX Plywood is used primarily by contractors to build exterior walls and roofs. Buy on Beacon Pro+ . Going back to the X in CDX, you may recall that it means âexposure.â ... CDX is the most common form of plywood, with a C-grade side and D-grade side, and the X stands for the glue that bonds the sheets together. It is also used for roof sheathing. The outcome is a wooden sheet that is relatively as solid as steel, without the weight that comes along with steel or cement. Share to Twitter Share to Facebook Share to Pinterest. CDX Plywood is used primarily by contractors to build exterior walls and roofs. A roof that lays practically flat will have a much heavier load than a steeper roof that allows rain, snow, and ice to roll right off. Fortunately, this is one issue that has primarily been standardized by the industry. At the end of the day, what kind of plywood should you use for your roof? WBP Structural Grade CE2+ Plywood Sheets. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? Plywood also has a slight advantage in stiffness, which means that subflooring panels do not need to be as thick. OSB and plywood offer similar (and sufficient) performance in terms of strength and functionality, though plywood is about 7% stronger. Understanding the different types of plywood for the roof, the thicknesses, and the common sizes can help you to make wiser decisions for your home. One of the major differences between OSB and CDX plywood is how well each holds up against water. At the end of the day, what kind of plywood should you use for your roof? You want to make sure that you are building a quality roof that will last you for decades to come, but you need the right kind of plywood for the roof. CDX plywood is a construction-grade type of plywood that is designed for exposure to the elements. In this case, plywood should be a minimum of 3/8 inch thick. The wood is graded on each side from A to D, depending on the level of imperfections, ( A being free of all imperfections and knots and D being un-sanded and considerably defected). 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