Therefore, the wood itself is not as dense as it is with hardwoods. Of all the types of plywood available on the market, CDX grade plywood is the most commonly available in our country’s lumberyards and building centers. If you have decided to use CDX plywood for your next home building project then now you must be wondering about its size, thickness, and availability options. Nominal Width. If the thickness of plywood increase 3mm, the No. Even ¾” thick plywood cannot cover a broad span, supporting weight, without sagging. Actual Thickness. Unplugged knots and knotholes up to 3 inches, splits and other defects allowed. So one side of the plywood is … Actually, the odd number of veneer layers allow for an even number of glue layers. This type of plywood is used in commercial building applications to meet with building code regulations for fire suppression and/or safety concerns. However, marine grade plywood really isn’t waterproof. 3/4” plywood by its more accurate thickness of 23/32”, 5/8” plywood by its more accurate thickness of 19/32”, 1/2” plywood by its more accurate thickness of 15/32”, 3/8” thick plywood by its more accurate thickness of 11/32”. 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. It’s not just plywood, other types of lumber are smaller than the advertised nominal dimensions for this reason as well. Nominal Thickness. This makes it usable in more visible applications, such as the building of furniture, even though it isn’t a cabinet grade plywood. Softwood plywood, which includes CDX plywood, is either made of pine or fir. Our calculators can simplify your woodworking project layout and estimation. Although available, it is rare to find plywood where both sides are the same grade. Repeated or prolonged exposure to rain (or ice and snow) will eventually compromise the integrity of this material. The veneers used in the core layers will also have permitted voids and splits. Most plywood is graded based upon the finish of the exterior layers, specifically the amount and type of defects that are allowed in these layers. For example, a sheet of plywood with a nominal thickness of 3/4” is often less than 3/4” thick. 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. Some mistakenly think the "X" stands for "exterior"—which is not true, exactly. Limited splits, discoloration or sanding defects that don’t affect the plywood’s strength. The secret to using CDX plywood for these applications is to first, design your project in such a way as to leave no exposed edges. per sheet (Inc. VAT) Select thickness. First, wood shrinks as it dries and moisture leaves the wood. Compared to CDX plywood sheets with the same thickness, these sheets have thinner layers and more of them, making this plywood stronger and denser. For example, 18mm plywood of 15 plies is stronger than 18mm plywood … of Plies will increase 2 plies; 2. This additional strength really helps when using CDX plywood as subfloors. As long as appearance isn’t a concern, CDX plywood can be used to build a wide variety of smaller projects. Show more. Width. Interior grade plywood, made using resins that can’t withstand water and weather as well, are not considered to be structural grade plywood. Add and subtract feet, inches, fractions, centimeters, and millimeters with ease. (c) 5-ply applies to plywood with 5 or more layers; for 5-ply/3-layer plywood, use values for 4-ply plywood. There are always an odd number of layers, balancing the sheet, to prevent warping of the panels. This plywood is made with the understanding that it will be exposed to the weather, during a home’s construction. Our board footage calculator can help calculate how many board feet you need if your plywood is sold using that measure. For example, a groove for the base in a cabinet needs to be the exact thickness of the plywood or the cabinet will not be stable due to the loose fit of the parts. Available Sizes: 4'x8' sheets; 3/8, 1/2, 5/8, 3/4 thickness The “C” graded side is the face side, used where it is more visible, and the “D” graded side is the reverse side, usually mounted in a way that hides it. CDX plywood sheets exposed to the elements can withstand exposure to rain or high moisture conditions, for a limited time, without compromising structural integrity. The Laws of No. 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. For most applications the 1/32” difference is not important, but for fine carpentry it may be critical to get grooves and cuts to be precisely the thickness of the 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. Learn how to layout wainscoting with all panels a consistent size for an even look. For this sort of shelving, it is common to use 1”x 4” or 2”x 4” dimension lumber to build a ladder framework to support the shelf. But that’s four months of normal rainy weather, not four months of snow and ice buildup. The point where the H-clips are, will not have any spacing, but the two sheets of CDX plywood will be butted up against each other. When it comes to choosing a subfloor for a ceramic tile floor it is always best to choose CDX plywood over OSB— it’s stronger and doesn’t have the problems with moisture that OSB does. This is essentially limited to hardwood plywood that is made specifically for cabinetmaking. Also, having 3/8″ thickness of wood compared to 1/4″ gives more wood for the nails to hold onto. The wood isn’t pressure treated or treated in any other way to make it waterproof, unless it is marked as being “pressure treated” plywood. 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. x 4 ft. x 8 ft. RTD Sheathing Syp - The Home Depot Calculate the size of a cabinet door based on the opening and generate a cut list of parts, including rail, stile, and panel dimensions. After screwed down on a 12"x12" grid and vinyl plank flooring over it the top layer of the 34.83 kg. Are You Planning a Trim Carpentry Project. Universal Sheathing Plywood, 0.75 in Thick, 4 ft Width, 8 ft Length, CDX Pine-Fir, 0.718 in Nominal Thickness. However, if vinyl floor covering is to be applied directly to the plywood, which is not recommended, fill any holes, knotholes and cracks. This number is known as a span rating. Another reason for varying plywood thicknesses is a range of manufacturing tolerances. This resistance to weather and dimensional stability after exposure makes CDX a superior choice for roof and wall sheathing, as opposed to the more economical OSB (Oriented Strand Board). While the length and width are often the actual dimensions, the nominal thickness is usually different than the actual thickness. The only exception is plywood which is stated as “having no voids,” such as marine grade plywood. Either roof felt or Tyvek house wrap could be used to dry in the exposed wall and roof sheathing. Item Number 271066. Radiant Barrier aluminum backed sheathing -- Improves energy efficiency. Browse our range of trade standard plywood boards such asStructural Hardwood Plywood, Shuttering Plywood or Selex Structural Plywood. These often aren't the actual thicknesses, however, because sanding during manufacturing removes up to 1/32 inch of material. Please note that these are nominal thicknesses. This means that if they expand at all, due to water absorption, they will buckle in some manner. 5. This means that a sheet of plywood that started at 3/4” may shrink slightly after manufacturing. The designation of being exterior grade plywood can also mean “Exposure grade 1” which stands for damp-proof plywood used for demanding environments such as underlayments and roof sheeting. In most cases, 1”x 4” is enough, as it will support the weight to be put on the shelf. As its name implies, the splits and defects have been plugged. There are a few reasons why the actual thickness of plywood varies. APA Rated Sheathing panels are produced as plywood or oriented strand board (OSB). than CDX plywood. Exterior grade plywood, marked with an “X” after the surface grade (CDX plywood means face side is grade C, back side is grade D, and the plywood is intended for exterior use) uses a resin that is more water resistant than interior grade plywood. If you’re in the middle of a project and a summer thunderstorm drenches your roof sheathing or the walls of the garage you’re erecting, relax…your project will be fine. However, take note that these are nominal thicknesses. Formation. Therefore, in applications where the stability of the plywood is important, it is better to use fir than pine. Our plywood calculator can estimate the number of 4′ x 8′ sheets needed for a project. Email Address Sign Up. It is rot resistant with knots replaced with football shaped plugs to give it a smooth moisture-resistant surface. If you’re in the middle of a project and winter sets in…that’s another matter altogether. This plywood is moisture resistant but not meant for long term weather exposure. This CDX plywood is economic so one can easily get it and that also in enough quantities. ACX also on hand for telecommunications panels / phone-board. When CDX plywood is used as roof sheathing, the C side of the plywood is placed up, where it will be covered by roofing felt and then shingles. The end result is that it slows the spread of fire, although it cannot stop it. 3/8 inch (4) 1/2 inch (19) ... Click to add item "2 x 2 Plywood Sheathing Handi-Panel" to the compare list. While this may not be allowed by building inspectors in all jurisdictions, it is in many. 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 1 1/4 inch thickness. Providing better information on softwood and hardwood. This introduces challenges when precision measurements are needed, such as when selecting a router bit or sizing a dado saw blade. That is, C and D describe the two sides of the plywood sheet. The higher grade panels are sanded on both sides and are sometimes referred to as Sanded Plywood or Sanded Panels. As CDX plywood is not intended for visible applications, where appearance is important, the lower cost of rotary cutting is advantageous. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. There is a mistaken idea that H-clips are there to provide spacing for expansion between the sheets of sheathing. A-Bond plywood is made using phenol formaldehyde resin. CDX Plywood Sizes, Thickness, & Availability. Item #12181 Model #185109 : ¼ inch panels are actually 7/32” or ¾” panels are actually 23/32” etc. Allow the filler to dry and then sand, before applying the flooring. The 1/8″ and 1/4″ plywood is used for making hard covered flats. If more flexible substrates are used as the subflooring, the extra bowing or flexing allowed by those substrates could lead to the separation of the adhesive mastic from the tile or cause the tile to crack. ... Sheathing, CDX Plywood 2440mm x 1220mm" 9000189656. 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. This plywood is made with an exterior grade glue. The most common thickness of plywood is 1/2-inch, but plywood thickness can range from 1/8-inch to 3/4-inches. A 3 / 4 ” sheet is actually 23 / 32 ” thick. 5/8 inch. Length 8' (2438 mm) Thickness 1/2" (12.7 mm) Width 4' (1220 mm) Sign Up for Updates. The letter "X" stands for exposure, which means the plywood is tough enough to withstand a … Plywood is most often sold in 4′ x 8′ sheets, but may also be available in 4′ x 10′, 4′ x 12′, or 2′ x 4′ sheets. Typical size is 4 ft x 8 ft, but other sizes may also be produced. Then, once it has dried, sand it smooth, providing you with the surface you need for painting. 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. Thickness. When we compare these two different softwoods, we find that fir has less soft grain than pine. However, the shelving will need some longitudinal support. The threshold for this is about four months. Solid, more knots than A grade, possible minor splits. It hasn’t been immersed in rosin, like a truly waterproof wood is. Plywood Alternatives. 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. As the most common plywood product available on the market, CDX plywood is available in a number of thicknesses, ranging from 1/4 to 1-1/4 inch thick and also including 3/8, 1/2, 5/8 and 3/4 inch thicknesses, which are the most common sizes. Any such shelving made of OSB requires special construction techniques, so that there is a secure means of fastening and supporting the panels. The use of H-clips is a decision made by either the architect or the structural engineer. This means that sections of logs are placed in a large lathe, which makes a continuous spiral cut, peeling off one long, continuous sheet of veneer, which is then later cut up for use. The thickness of plywood normally used is 1/8″, 1/4″, 1/2″, and 3/4″. Based upon this grading system, we can see that CDX plywood has one side that is “C” grade and one that is “D” grade. 0.563 inch. Even areas that don’t have voids, will have rough end grain that can’t be made smooth. 23/32 in. This plywood type is not waterproof or pressure treated, so it does absorb water. This plywood is sold in full 4×8 sheets only. Feet and Inches Length Measurement Calculator. 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. It comes in various thicknesses and sizes, and is typically sold by its nominal thickness. It typically comes in 4 x 8-foot sheets. This is mostly because void free veneers are used in the making of marine grade plywood, whereas some voids are permissible in the manufacture of marine grade plywood. Marine grade plywood also has better face veneers than CDX, which are sanded smooth. Herein, the letters C and D denote the quality of the surfaces (both front and back). Once assembled, cover the plywood with a thin layer of wood putty, spackling or even drywall mud. Roof sheathing may be supported by H-clips, in addition to being nailed to the rafters. Even within the exterior classification we can find differences, based upon the rosin used to bond the veneers together. CDX plywood is often utilized as roof sheathing or for exterior walls due to its water resistance. For this reason it is very common to see actual thicknesses on the thinner side and rarely thicker than the nominal measurement. It is usually made from fir or pine, just like CDX. 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. But, you can also run into problems if you go too thick. Buy on Beacon Pro+. Plywood is a wood panel that is composed of several thin layers, or plys, of wood veneer. Georgia Pacific 1/2" x 4' x 8' 4-Ply CDX Plywood. Item # 271066 . When making a selection below to narrow your results down, each selection made will reload the page to display the desired results. 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. B-Bond plywood is made using melamine-urea-formaldehyde. While the voids and splits do affect the structural strength of the plywood somewhat, that is calculated into the permissible load for the specific plywood thickness. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. This type of plywood is also referred to as “structural plywood;” a designation which means that it is intended for structural applications. 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. It is usually made from fir or pine, just like CDX. It still requires waterproofing, especially on the edges, to protect the end grain. Each layer is made from one piece of wood, so there are no gaps in the middle layers that could weaken the sheet or … CDX Plywood has a C grade front side, D grade back side, and exterior glue. CDX, ACX, & Fire retardant available with chain of custody certificate. Plywood is almost always thinner than the nominal measurement due to the fact that most tooling in furniture and cabinet factories and manufacturing facilities can accommodate plywood that is thinner than expected but not thicker than expected. The use of CDX plywood provides superior protection. This support keeps the shelf from sagging. CDX plywood sheets are also available in a fire retardant variant, though those sheets come with a much heftier price tag. 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. This soft wood is what absorbs moisture, causing the wood to warp and buckle. An exterior grade pine plywood with a CD grade, sheathing grade. (b) Shear through the thickness design capacities are limited to sections two feet or less in width; wider sections may require further reductions. This plywood is chemically treated with a fire retardant, making it less likely for the plywood to catch fire. Plywood Prices - OSB, CDX, T&G costs for interior and exterior plywood panels, sheets. This type of plywood won’t sag when used on a 12 inches joist structure. While this process does not produce attractive grain patterns, the larger veneer sheets make it much easier for construction plywood out of. CDX plywood is much thicker and can be bought for low prices in large volumes. OSB panels delaminate and swell when exposed to the elements and don’t go back to their original shape after it dries. Although considered an exterior plywood, CDX is often utilized as the subfloor for kitchens and bathrooms— especially for floors destined to be finished with ceramic tiles. 1. Roof and wall sheathing is such an application. 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. The weight of a panel will vary by thickness and the type. Plywood is generally available in 4’x8′ sheet and is cut into a square board. These were mostly shelving units of one sort or another, but I have also built children’s furniture, such as fire truck bunk beds and animal shaped toy boxes. Specifications ; Specifications. They may even be commonly referred to as plywood, despite being manufactured differently. 3/8 Cat Ps1-09 Square Structural Douglas Fir Sheathing, Application as 4 x 8. CDX plywood is the lowest class of plywood and is often used in the construction industry or as a base for other materials. Exterior sheathing is most often ½” thick (nominal dimension; actually 15/32” measured dimension) for both walls and roofs. CDX & Struct-1 available. This makes the faux planks feel more authentic. Actual Width. CDX plywood takes glues and adhesives well (better than OSB due to the waxes involved with OSB manufacturing) as well as fasteners. The recommended shed floor plywood thickness is 3/4 inch pressure-treated exterior-grade CDX plywood. CDX plywood is an exterior grade plywood only in the sense of considering the adhesive used for connecting the veneer plys. Get the latest news, tips, tools and product updates for all your roofing projects. Plywood is usually sold by the sheet, but in some rare cases it may be sold by the board foot. C and D grade plywood veneers aren’t smooth and don’t have an attractive grain pattern, so they wouldn’t be used for furniture or commercial fixtures where the grain is visible, unless the intent is to provide an industrial appearance. Most plywood, other than hardwood cabinet grade plywood, is graded with two letters, showing the face and reverse side grading of the plywood. From . Find the room's perimeter to find out how much trim is needed. The difference between interior and exterior plywood is in the resin glue which is used to hold the various layers of veneer together. It was installed about 2 weeks ago. Job-site handling • OSB panels lie flat and are engineered for consistent An odd number of glue layers would cause the glue to pull towards one direction, causing warping of the panel. If you have exposed edges, cap them with hardwood. Plywood is often sold in 1 / 4 “, 1 / 2 “, or 3 / 4 ” nominal thicknesses, but the actual thickness is often 1 / 32 ” thinner. Used it over 3/4" ply when replacing the subfloor in my house. A more economical choice this plywood allows for knots and other imperfections on both faces. The nominal thicknesses of plywood range from 1/8 inch, or 3.2 mm, to 1 1/4 inches, which is equivalent to 31.75 mm. CDX stands for class C to D exposed plywood. Technical specification: Length. This leaves the D side facing down, into the attic, where it will most likely be seen. 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. Minimum Plywood Thickness The International Residential Code specifies 3/8-inch plywood for sheathing walls with a standard stud spacing … Moisture resistance • Plywood absorbs water faster and dries out faster than OSB. Otherwise, it will absorb water, with all the ensuing problems. Thus, a plywood sheet with a nominal thickness of 3/8 inch is actually 11/32 inch thick. The veneers are rotary cut from a log. However, I have built a number of pieces of furniture out of CDX plywood, where the intent was to keep the cost low and the furniture pieces were to be painted. In the process, it expands slightly, but will dry quickly. Board footage is a measure of the volume of wood in the sheet. £18.67. CDX is a great economical choice for construction grade plywood! 1220 mm. The thicker the plywood, the more noticeable depth the gap is between the planks. Of the two, A-Bond is more weather resistant. Therefore, it is designed to handle a limited amount of rainfall, without causing any significant damage to the plywood. The term CDX is basically not the name of the plywood grade, but the abbreviation of C-D Exposure 1 plywood. Most plywood underlayment is about 1/4 inch thick and has square edges and a smooth, knot-free top face. However, the Universal Building Code states that it is acceptable to use 3/8” thick CDX plywood for sheathing. 2.4 Common Performance Categories And Corresponding Span Ratings Performance Category Span Rating 3/8 24/0 7/16 24/16 Therefore, it is much easier to use CDX. The plywood made of more plies is stronger than the plywood of same thickness but made of less plies. The actual thickness of these plywood sheets will be 1/32 inch less than the nominal size, due to finish sanding of the sheet. Learn more about plywood weight for different types, including softwood, hardwood, marine-grade, OSB, MDF, MDO, and particle board. CDX plywood is not marine grade; therefore, it should not be used for the building of boats, although it theoretically could be. 47-7/8 (+/- 1/32) inch. Limited number of patches. The plywood will provide a stronger shelf than OSB would, with less tendency towards waviness. 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. Fire Retardant Treated Plywood: 1/2", 5/8", 3/4". You might want to give any exposed CDX plywood some protection, especially exposed roof sheathing. 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. These different grades have different manufacturing tolerances and may vary more or less from the 3/4” nominal thickness. Source: This is false. That said, CDX plywood isn’t immune to the slings and arrows of Mother Nature indefinitely. 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. The smoother C side is better for putting roofing felt onto, as splits and holes can cause wear in the felt, leading to failure. Today, more and more lumberyards are stocking their CDX plywood with more accurate descriptions, referring to: CDX plywood is used for a number of applications, including: Construction sheathing of walls and roofs. CDX Plywood Size, Thickness, and Availability. The ultimate resource for plywood.

cdx plywood thickness

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