When the appearance of the face is of lesser concern than the strength and stability of the material, structural plywood will typically be the choice. Qty / Each. (b) Shear through the thickness design capacities are limited to sections two feet or less in width; wider sections may require further reductions. 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. In reality, CDX plywood can only withstand water for a short period of time. As a result, OSB floors are more likely to squeak due to floor movement cause hard floor surfaces to crack (such as tile) result in soft, spongy floors Cost of Plywood vs OSB. BY SEAN GROOM Drawings this page: Don Mannes. x 96 in.) Some mistakenly think the "X" stands for "exterior"—which is not true, exactly. Softwood plywood is typically used as structural plywood (roof decking, sheathing, flooring). Basic Stresses for Plywood Grades: Exposure 1 or exterior glue 1.10 (shear) STRUCTURAL I 1.56 (shear) Groups 2 and 3 for sanded or touch sanded (Tables 2 & 3) 0.73 (bending) 0.67 (deflection) Group 4 for sanded or touch sanded (Tables 2 & 3) 0.67 (bending) 0.56 (deflection) Preservative Treatment: No adjustment required Fire-Retardant Treatments: Plywood is generally available in 4’x8′ sheet and is cut into a square board. MDF is used for doors and internal paneling in construction, where moisture is less likely to damage it, but was exclusively developed for furniture. CDX Grade Plywood is a popular choice for roofing work.CDX stands for ; C – the grade of the front of the plywood sheet. D – the grade of the back of the plywood sheet. We also stock Oriented Strand Board Structural 1 and OSB Radiant Barrier. In fact, recent price quotes from Denver, Boston and Atlanta put 7/16-inch osb $3.00 to as much as $5.00 per sheet lower than 1/2-inch cdx plywood. You’ll find facts about plywood … Structural Plywood . Framing applications where state and/or local building codes require shear wall construction for extra strength. Huber manufactures the premium OSB products such as Advantech sheathing, which many builders prefer over plywood, due in part to quality problems they were seeing in plywood. Visit The Home Depot to buy 15/32 in. Nails directly over framing wall studs and roof joists. One of the major differences between OSB and CDX plywood is how well each holds up against water. Plywood being used in house construction. OSB sheathing has one irritating characteristic—but only if you abuse the stuff. As the name suggests, structural plywood is best used for building and construction purposes like beams and hoardings. Zip Sheathing can provide a very tight, weatherproof shell in one step. Not suitable for Floors, roofs or walls. About Luan and Plywood Plywood is probably one of the most popular material used to build many things because they are very versatile and can be used for a wide range of structural, interior and exterior applications starting from framework until the internal paneling. – What Luan and Plywood are used for – Luan vs Plywood. Overview. In addition, plywood panels are often identified with regard to the quality of the face and back veneers (e.g., A-C, C-D). Here’s what you need to know. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood. Voluntary Product Standard PS 1-07 Structural Plywood May 2007 U.S. Department of Commerce Carlos M. Gutierrez, Secretary Technology Administration Robert Cresanti, Under Secretary of Commerce for Technology National Institute of Standards and Technology William Jeffrey, Director. Most plywood underlayment is about 1/4 inch thick and has square edges and a smooth, knot-free top face. For 15/32 and 1/2-inch the Standard provides for 3-, 4-, and 5-ply panel construction. Going back to the X in CDX, you may recall that it means ‘exposure.’ Many people think the X stands for ‘exterior,’ but that’s a common misconception. All items available Structural 1; Applications. 23/32 in. (c) 5-ply applies to plywood with 5 or more layers; for 5-ply/3-layer plywood, use values for 4-ply plywood. A 4-ply panel is … The letter "X" in CDX refers to the type of glue used in the factory to bond the plywood veneers. Structural 1 sheathing (roof and/or wall), underlayment, Structural 1 underlayment, concrete form, or marine. Even within the different plywood grades, you’ll likely find a wide range in the number of repairs or defects. The thickness of plywood normally used is 1/8″, 1/4″, 1/2″, and 3/4″. (c) 5-ply applies to plywood with 5 or more layers; for 5-ply/3-layer plywood, use values for 4-ply plywood. The letters C and D represent the grades of either side of the plywood, while X stands for exposure. Some splits. 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. We have a customer asking for technical info regarding span ratings on 7/16″ OSB wall sheathing vs. 1/2″ CDX. It is made of wood chips, resin and glue, cast and baked together to produce a CDX-like sheet. Major differences between OSB and CDX x 4 ft. x 8 ft. Fir Sheathing Plywood (Actual: 0.688 in. The two are bonded together with glue which can withstand a little moisture. Structural plywood is usually a lower grade of plywood -- "CD." Structural plywood … But B-Bond Structural plywood is also used for use of exterior applications. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. For many years, the standard option was lauan plywood, also called Philippine mahogany or luan plywood, which is made with an inexpensive tropical hardwood, and therein lies its problem. PS 1-83 establishes requirements for producing, marketing and specifying construction and industrial plywood. Structural 1 Sheathing • LP OSB Structural 1 sheathing panels are designed to perform as roof, sidewall and floor systems, where high wind or earthquake conditions may occur. There's no price savings at all using Struct 1 OSB versus Struct 1 CDX plywood , but there's a big difference in the price for CDX 5 ply plywood versus OSB Struct 2. It … Please send me any information you can that would demonstrate that Trubord OSB is a suitable replacement for CDX. Suitable applications for structural plywood. OSB sheathing costs a few dollars less per sheet than 1/2-in. SBE Builders will only use CDX plywood or OSB that has a APA rated sheathing stamp with a EXPOSURE 1 stamp. Uses in Construction. 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. OSB, on the other hand, stands for Oriented Strand Board which is a cheaper version of CDX. In our area, 1/2-in. The APA Standard weights are not the weights of actual products and tend to be somewhat heavier than the weights of any real softwood plywood you will find. 1/2″ plywood is used for building furniture parts, boxes and props. x 4 ft. x 8 ft. Struct 1 Plywood Sheathing 654684 We carry a wide selection of Plywood, including CDX, Sturd-I-Floor, Radiant Barrier, Pressure Treated and Fire Rated. Sub-wall/roof foundation for home wrap vapor-barrier and the most common siding material to be applied directly over it. But this type of plywood can also be used in crates, internal structures, bins, boxes, and outdoor furniture. The letter "X" stands for exposure, which means the plywood is tough enough to withstand a little moisture—but for only a short time. Product Standard PS 1-07: Structural Plywood. PS 1, Structural Plywood, establishes requirements for structural plywood. It typically comes in 4 x 8-foot sheets. They are completely waterproof and are great for installing in places where you expect consistent exposure to moisture. • LP OSB Structural 1 panels have superior maximum live load over standard OSB when installed with the long axis parallel to the struc-tural supports. x 48 in. The 1/8″ and 1/4″ plywood is used for making hard covered flats. M9.2.1 – M9.2.4 for the appropriate multipliers for Structural I panels. Generally no repairs. Knots and knotholes up to 2-1/2 in. It is generally available in 1/4-, 3/8-, 1/2- and 3/4-inch thicknesses. SEALOFLEX INC. 2520 OSCAR JOHNSON DRIVE, CHARLESTON, SC 29405 PHONE: 843 554 6466 ٠ FAX: 843 554 6458 ٠ WWW.SEALOFLEX.COM 8/11/2009 CDX PLYWOOD vs. OSD PLYWOOD OSD and CDX plywood are both commonly found on construction sites, because For instance, with 24-inch truss/joist spacings, the National Wood Flooring Association recommends nominal 1 inch OSB underlayment compared to 7/8 inch CDX plywood. A 4’ x 8’ sheet of 1/2-inch APA Standard Plywood would weigh 48 lbs. industrial plywood industry. "CDX" should only be used for applications as outlined under Exposure 1 above. Plywood also has a slight advantage in stiffness, which means that subflooring panels need not be quite as thick. OSB is cheaper than plywood by about $3 to $5 per panel. This standard covers the wood species, veneer grading, adhesive bonds, panel construction and workmanship, dimensions and tolerances, marking, moisture content and packaging of structural plywood intended However, plywood subfloors are stiffer than OSB by about 10%. With the exception of Plyron and some APA Performance Rated Panels, all of the other plywood grades described in this guide are produced under the provisions of U.S. But the tape must be applied with care. What is OSB. The letter Some structural plywoods are also used for wall and roof bracing. Their architect is asking whether OSB will provide the same strength as CDX, and meet code requirements. CDX Plywood is used primarily by contractors to build exterior walls and roofs. A 1/4" Bendy MDF sheet (24" x 48") is about $22 on Amazon, while a Grade B-BB plywood sheet (1/4" thick, 24" x 30") is $10 on Amazon. The resins used to adhere the plies are designed for extra strength to avoid separating the layers. Product Standard PS 1-83. For instance, with 24-inch truss/joist spacings, the National Wood Flooring Association recommends nominal 1 inch OSB underlayment compared to 7/8 inch CDX plywood. grades of structural plywood and provide a basis for common understanding among producers, distributors, and users of the product. plywood. For more information about softwood plywood, visit the American Plywood Association. Plywood vs. OSB New-generation structural panels mean decade-old notions are no way to choose sheathing. 11 and above. Exposure 1 rated plywood, mostly called “CDX” in the trade. For example, consider a 15/32 or 1/2-inch C-D Exposure 1 (CDX) plywood meeting the requirements of U.S. A is more durable and stronger than B-bond. And OSB is available in 4 x 9-ft. sheets, which means you can sheathe an 8-ft. tall wall and the joists below with a single sheet. Exterior panels sometimes referred to as RTD sheathing, are designed to hold up to constant moisture . Plywood also has a slight advantage in stiffness, which means that subflooring panels need not be quite as thick.