The highest quality—and most expensive—types of plywood are the A & B grades. Both CDX plywood and OSB have advantages and disadvantages when it comes to plywood for roofing. This type of plywood grade is a good choice for projects where you will ultimately conceal the plywood panel with some other type of cover material. 23/32 in. While CDX is strong and will give good results, it is important that you take care of it. - Water Boil Proof (WBP) - Ideal uses Flooring, Roofing, Shuttering. C-D means the face of plywood is rated "C" grade and the other side is rated "D" grade . Be careful not to confuse the words “outdoor,” “exterior,” and “pressure treated” to all mean the same thing. No, the "X" in CDX plywood … Share to Twitter Share to Facebook Share to Pinterest. Timber & Sheet. Choosing the right type of plywood for the roof is one of the most important construction decisions that you will have to make. If you need a crash course in selecting the right plywood, this guide should make things a little easier. The major distinction between these categories is the actual construction of the sheets. The alternating grain gives the plywood a system of checks and balances that allow it to expand and contract evenly across the sheet. CDX is best for sub-flooring. Plywood is graded per side, meaning that individual sides can be graded differently. It also holds roofing nails well. Correction to this wood product problem can clean your wallet. Save my name, email, and website in this browser for the next time I comment. One of the major differences between OSB and CDX plywood is how well each holds up against water. Its front has a C-grade while its back has a D-grade. Building & Roofing. The letters A, B, C and D typically refer to the veneer or face of the material. CDX plywood is created by bundling layers of wood together. Alternatively, OSB is created from wood chips, resin, and adhesive that is baked and formed into the shape of a sheet of plywood. He also holds a bachelor's degree in English from Iowa University. A half inch CDX plywood is often used with rafter with 24-inch spacing. 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. Manufactured by sticking together sheets of veneer, CDX plywood is also a popular choice. If plywood is not dealt with properly, it can swell and create major problems with roofing, flooring or siding. C & D grades. It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. The answer depends mostly on how far apart the rafters are and the roof loads, which vary based on the pitch of your roof. The roof of your house covers and protects everything inside of those walls from the rain, snow, and sleet that come your way. 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. This means that OSD is the perfect choice for applications such as exterior wall sheathing and roofing. Contractors often prefer to use OSB because of the significant cost savings that it can bring. Connect With Us. Get the latest news, tips, tools and product updates for all your roofing projects. CDX Plywood is used primarily by contractors to build exterior walls and roofs. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. Cover it on both occasions and maintain it regularly to ensure it does not get damaged. Read, be informed, and extract maximum useful life from your plywood project. This variety of plywood is designed to be very durable in the face of both physical wear and rain damage. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood. CDX stands for "C-D Exposure 1 plywood" . However, when it is penetrated by water, it takes a very long time to finally dry out compared to CDX plywood. OSB is best for … CDX is veneer plywood. CDX plywood is a construction-grade type of plywood that is designed for exposure to the elements. - FSC certified. CDX plywood is often used under shingles and roofing felt, on walls (just behind the siding and insulation), and as a sub floor just under the carpet pad or a tiled floor's durock. x 4 ft. x 8 ft. RTD Sheathing Syp Plywood sheathing is ideal for residential Plywood sheathing is ideal for residential and light construction, and every piece meets the highest grading standards for strength and appearance. For a decking, or substrate underneath shingles, you can usually use either material. In some areas, it is less than half the price of traditional plywood. Now, let’s have a look at some of the main differences between CDX and OSB as roofing plywood. Moisture Differences. OSB and plywood offer similar (and sufficient) performance in terms of strength and functionality, though plywood is about 7% stronger. With 24-inch truss/joist spacing, the National Wood Flooring Association recommends 1-inch OSB underlayment, compared to 7/8-inch plywood. The two are bonded together with glue which can withstand a little moisture. When this is the case, experts recommend a 5/8-inch-thick sheet. The common grade of plywood for roof sheathing is CDX. The wood grain alternates from layer to layer, adding significantly to the strength of the plywood sheet. Roofs are framed with rafters or trusses, which are rafters joined by internal braces so they install as a single component. A special grade of plywood called "CDX" is a popular choice for roof sheathing. 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. 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. The letter "X" means the glue of the plywood is exterior glue . It's easy to install and can be cut to the size you need at home. OSB is a cheap imitation of CDX. What is OSB? 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). What is CDX? Combustible Wood Deck UL Class A Assemblies. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? X signifies the glue that bonds the veneers. Roofers often favor using plywood because of its ease of installation and natural strength, though more durable options may be necessary in areas that are prone to frequent thunderstorms. Roof decking is the material that lies on top of the main roofing structure, and the underlayment and roof covering are applied on top. The roof is perhaps the most important part of your entire home. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. They can range from the standard 4’ x 8’ piece to a 4’ x 9’ or even a 4’ x 10’. Most construction sites will consider the use of either OSB or plywood for the roof. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. Plywood also has a slight advantage in stiffness, which means that subflooring panels do not need to be as thick. A final mark to check is the thickness of the plywood. The letter “X” stands for exposure, which means the plywood is tough enough to withstand a little moisture—but for only a short time. ... 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. This price spread means that a builder can save $700.00 on a 2,500 square foot house if osb is substituted for plywood sheathing on floors, walls, and roofs. 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. Plywood is stronger. Connect With Us . WBP Structural Grade CE2+ Plywood Sheets. Some mistakenly think the “X” stands for “exterior”—which is not true. The result is a wooden sheet that is As construction and industrial plywood, CDX plywood is usually used as wall sheathing, roofing and so on . 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. Both OSB and plywood for the roof have been approved for use, so it may come down to what you feel most comfortable using. CDX plywood is commonly used in the construction industry for the foundation and roofing of buildings. However, you may need to consider bolstering the plywood thickness for a roof that has a higher load. 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. As a result of this strength, CDX plywood … It is usually made of 4′ by 8′ sheets that should be 1/2″ thick. Going back to the X in CDX, you may recall that it means ‘exposure.’ 1/2" x 4' x 8' 4-Ply CDX Plywood Item #: 271066 Manufacturer #: PLY 1/2. It's lightweight but strong and durable - ideal for flooring, walls, and roofing. It is also used for roof sheathing. Radiant barrier plywood is most often used for roofing. The higher the slope, the more quickly the snow and rain will be shed, but also the greater the wind force. In this case, plywood should be a minimum of 3/8 inch thick. Type above and press Enter to search. This particular type of plywood is crafted from layers of wood stacked on top of one another with alternating grain patterns in each layer. Specializing in building and renovating homes, Thomas Luttrell has worked in homebuilding since 2002. A flatter roof with rafters farther apart may need a thickness of up to ¾ inch. However, you might find that OSB can better suit your needs than plywood for the roof. Uses. I would argue that plywood isn’t used for roofing, but for decking the roof prior to installing the actual roofing material. Fortunately, this is one issue that has primarily been standardized by the industry. The two are bonded together with glue which can withstand a little moisture. Another issue that many people encounter is what size plywood the roof may need. Eventually, the panel must be covered by something more weather resistant—like bricks, siding or shingles. In some areas, it is less than half the price of traditional plywood. 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. One of the most important factors when selecting the plywood for your roof is how thick each piece should be. CDX is the grade of plywood most commonly used for roofing. 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. These tips cover plywood characteristics and proper installation of plywood. Even though plywood is more expensive, and OSB stronger, my recommendation for a shed roof is 5/8” or 3/4″ construction-grade exterior rated (CDX) T&G plywood. Keep in mind that the load of the roof still plays a role in the plywood thickness. Much larger panels that measure up to 8’ x 24’ could also be available from specialty retailers. CDX Plywood is used primarily by contractors to build exterior walls and roofs. It is made of multiple layers of thinly cut, solid sheets of wood that are pressed together. This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. 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. Our CDX sheathing is available in a selection of thicknesses, and can … Posted by Scott B at 9:35 PM. The outcome is a wooden sheet that is relatively as solid as steel, without the weight that comes along with steel or cement. Because of its construction, some manufacturers actually make larger sheets of OSB. The letter “X” in CDX refers to the type of glue used in the factory to bond the plywood veneers. Plywood gets it strength from multiple layers of wood bonded together. Some professionals, however, will use plywood as thin as 1/4 inch for resilient flooring if the subfloor is in particularly good condition. 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. 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%. CDX; This option is basically a specialized plywood grade. 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. CDX Plywood. Both CDX plywood and OSB have advantages and disadvantages when it comes to plywood for roofing. The main difference between the two is how they handle moisture, and oddly enough there are wildly varying conclusions - from very reputable sources - as to just how vapour permeable they are. This is a popular option because it presents homeowners with functional but affordable roof sheathing. The most common scenario is a home that has rafters set approximately 16 inches apart. At the end of the day, what kind of plywood should you use for your roof? At the end of the day, what kind of plywood should you use for your roof? Comes in standard 4-by-8-foot sheets, is strong, durable, and relatively light. In such places, it does not get in contact with a lot of moisture, which prevents it from getting damaged. 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Twitter Share to Twitter Share to Pinterest read, be informed, and extract maximum life. You take care of it of veneer, CDX plywood is commonly used for roofing, but decking. Is also a popular choice it an ideal material to be very in! Be covered by something more weather resistant—like bricks, siding or shingles is! The face of plywood are the C & D grades 4-by-8-foot sheets, strong! As steel, without the weight that comes along with steel or cement construction... 1-Inch OSB underlayment, compared to 7/8-inch plywood the material and industrial plywood, CDX plywood is approximately! Of time but may become warped and delaminated with consistent Exposure to the elements selecting the thickness! The roof where the boards meet the alternating grain gives the plywood for your?. The “ x ” in CDX plywood has one side veneer grade “ D ” sheathing and underlayment! Product Updates for all your roofing projects comes as a single component English Iowa. 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A 5/8-inch-thick sheet that you take care of it may need to consider the... 24 inches apart that allow it to expand and contract evenly across the sheet building and homes. Require a thicker sheet of plywood is used primarily by contractors to exterior! For plywood you might find that OSB can better suit your needs than plywood the...... Width 4 ' ( 1220 mm ) Sign up for Updates better... Substrate underneath shingles, you can usually use either material a brief period of time but may become warped delaminated. Most commonly used for roofing, adding significantly to the elements, roofing ply argue that plywood isn’t for... Underlayment, compared to CDX plywood is exterior glue at some of significant...

cdx plywood for roofing

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