This softwood plywood is the least expensive grade of multi-layered veneer plywood, manufactured in small factories around the country for local use, predominantly in construction. Fire Retardant Treated Plywood: 1/2", 5/8", 3/4". Technical specification: Length. These clips, so named due to their shape, connect the edges of adjacent sheets of plywood, halfway between the rafters, helping to ensure that one panel doesn’t bow one way and the next bow the other way. ... CDX plywood should be a minimum of 7/16 inch thick. 2440 mm. When making a selection below to narrow your results down, each selection made will reload the page to display the desired results. In most cases, 1”x 4” is enough, as it will support the weight to be put on the shelf. Once dry, it returns back to its original size. This additional strength really helps when using CDX plywood as subfloors. This plywood is chemically treated with a fire retardant, making it less likely for the plywood to catch fire. It was installed about 2 weeks ago. Plywood Thickness and Weights: Sanded Nominal Thickness 1/4 3/8 1/2 5/8 3/4 1-1/8 Actual Thickness 1/4 11/32 15/32 19/32 23/32 1-1/8 Approximate weight per 4x8 sheet 22.0 28.5 40.6 48 60.8 84.5. It hasn’t been immersed in rosin, like a truly waterproof wood is. While this may not be allowed by building inspectors in all jurisdictions, it is in many. A-Bond plywood is made using phenol formaldehyde resin. Limited number of patches. CDX plywood sheets are also available in a fire retardant variant, though those sheets come with a much heftier price tag. The 1/8″ and 1/4″ plywood is used for making hard covered flats. What is the Actual Thickness of a Sheet of Plywood. Learn how to layout wainscoting with all panels a consistent size for an even look. (b) Shear through the thickness design capacities are limited to sections two feet or less in width; wider sections may require further reductions. OSB panels used as roofing sheathing exposed to rain or snow can give the subsequent shingles an unattractive wavy appearance, which is most obvious at the edges of the roof. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to,,, The Ultimate Guide to Sealing Laminate Floors, Install a Combination Boiler/Water Heater, Exterior Walls Construction: The Start-to-Finish Guide, The Uses of and Challenges in Cutting Formica, The Ultimate Guide to DIY Birdhouse Design, Aquarium Cabinetry: A DIY Guide to Custom Aquarium Stands, The Ultimate Guide to Building a Bat House, The Ultimate Guide to Building a Portable Generator Enclosure, How to Remove and Replace Your Load Bearing Wall, Drying Wood in the Oven: The Ultimate How-To Guide, How to Cut a Groove or Channel on Wood Without a Router. Better yet, install a layer of lauan plywood over the CDX plywood, as an underlayment, providing a smooth surface for the vinyl flooring to be mounted to. This added strength means less bowing/flexing in the subfloor. This is essentially limited to hardwood plywood that is made specifically for cabinetmaking. Find the room's perimeter to find out how much trim is needed. This means that a sheet of plywood that started at 3/4” may shrink slightly after manufacturing. Therefore, it is designed to handle a limited amount of rainfall, without causing any significant damage to the plywood. Marine grade plywood also has better face veneers than CDX, which are sanded smooth. Are You Planning a Trim Carpentry Project. The weight of a panel will vary by thickness and the type. Please note that this grading system has nothing to do with the quality of the inner veneers, just the face veneers. 3/8 inch (4) 1/2 inch (19) ... Click to add item "2 x 2 Plywood Sheathing Handi-Panel" to the compare list. CDX plywood sheets exposed to the elements can withstand exposure to rain or high moisture conditions, for a limited time, without compromising structural integrity. This type of plywood is also referred to as “structural plywood;” a designation which means that it is intended for structural applications. For this reason it is very common to see actual thicknesses on the thinner side and rarely thicker than the nominal measurement. Therefore, the wood itself is not as dense as it is with hardwoods. As the most widely recognized plywood product on the market, CDX plywood is accessible in various thicknesses, going from 1/4 to 1-1/4 inch thick and furthermore including 3/8, 1/2 CDX plywood, 5/8, and 3/4 CDX plywood. This understanding of the face side even applies in situations where the plywood will later be covered up. Providing better information on softwood and hardwood. Nominal Width. The recommended shed floor plywood thickness is 3/4 inch pressure-treated exterior-grade CDX plywood. : ¼ inch panels are actually 7/32” or ¾” panels are actually 23/32” etc. There is a mistaken idea that H-clips are there to provide spacing for expansion between the sheets of sheathing. of Plies in a Plywood. The end result is that it slows the spread of fire, although it cannot stop it. The letter "X" stands for exposure, which means the plywood is tough enough to withstand a … Plywood Alternatives. For example, 18mm plywood of 15 plies is stronger than 18mm plywood … Rated sheathing, also known as CDX in the trade; ... (Panel width and length may vary up to 1/8" to aid with proper installation) Specifications. This plywood is moisture resistant but not meant for long term weather exposure. (c) 5-ply applies to plywood with 5 or more layers; for 5-ply/3-layer plywood, use values for 4-ply plywood. It comes in various thicknesses and sizes, and is typically sold by its nominal thickness. Packing crates or shipping large valuables and furniture are often made of CDX plywood, taking advantage of its low cost, high strength and water resistance. The Laws of No. CDX Plywood Size, Thickness, and Availability. CDX & Struct-1 available. Solid, more knots than A grade, possible minor splits. Email Address Sign Up. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. Width. CDX plywood is the lowest class of plywood and is often used in the construction industry or as a base for other materials. The threshold for this is about four months. Please note that these are nominal thicknesses. These will usually be a distinct color (green or yellow) caused by the resin they were pressure treated in, causing them to stand out from standard exterior grade plywood. CDX plywood is not marine grade; therefore, it should not be used for the building of boats, although it theoretically could be. Moisture resistance • Plywood absorbs water faster and dries out faster than OSB. Source: Allow the filler to dry and then sand, before applying the flooring. Formation. You can use CDX plywood for the construction of storage shelving in garages, attics and basements; places where appearance isn’t important, without going through all that trouble. Smooth, paintable surface. If you’re in the middle of a project and winter sets in…that’s another matter altogether. 0.563 inch. CDX plywood is manufactured, like other types of softwood plywood, of opposing layers of wood veneers, laid at right angles to each other and glued together with resinous glue. 23/32 in. Even ¾” thick plywood cannot cover a broad span, supporting weight, without sagging. Those need to be cleaned off to protect the plywood from damage. Based upon this grading system, we can see that CDX plywood has one side that is “C” grade and one that is “D” grade. That is, C and D describe the two sides of the plywood sheet. The ultimate resource for plywood. Lower cost engineered sheet wood products, such as OSB can much more easily be punctured in these applications, limiting the amount of protection they can provide to the goods stored inside. Nominal Thickness. This type of plywood won’t sag when used on a 12 inches joist structure. Show more. Thus, a plywood sheet with a nominal thickness of 3/8 inch is actually 11/32 inch thick. £18.67. However, marine grade plywood really isn’t waterproof. Buy on Beacon Pro+. Another reason for varying plywood thicknesses is a range of manufacturing tolerances. Both types of panels swell around the edges as they get wet, but plywood returns nearly to its original thickness as it dries, while OSB swelling is irreversible. It is usually made from fir or pine, just like CDX. Item Number 271066. Feet and Inches Length Measurement Calculator. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. The thicker the plywood, the more noticeable depth the gap is between the planks. The actual thickness of these plywood sheets will be 1/32 inch less than the nominal size, due to finish sanding of the sheet. Nominal Thickness. When placed across equally spaced beams, joists or rafters, CDX is almost 10% stronger than OSB, the other alternative which is often utilized as a subfloor due to its economy. B-Bond plywood is made using melamine-urea-formaldehyde. Softwood plywood, which includes CDX plywood, is either made of pine or fir. The major difference between them is that marine grade plywood is made of more durable veneers, which will withstand exposure to moisture better than CDX plywood. However, if vinyl floor covering is to be applied directly to the plywood, which is not recommended, fill any holes, knotholes and cracks. The only exception is plywood which is stated as “having no voids,” such as marine grade plywood. There are always an odd number of layers, balancing the sheet, to prevent warping of the panels. It is rot resistant with knots replaced with football shaped plugs to give it a smooth moisture-resistant surface. First, wood shrinks as it dries and moisture leaves the wood. Limited splits, discoloration or sanding defects that don’t affect the plywood’s strength. Add and subtract feet, inches, fractions, centimeters, and millimeters with ease. It is not necessary to fill the splits or knotholes in the face veneer of CDX plywood, when used as a substrate for ceramic tile. This makes it usable in more visible applications, such as the building of furniture, even though it isn’t a cabinet grade plywood.