This will remove a small amount of thickness of the material as well.Īnother reason for varying plywood thicknesses is the range of manufacturing tolerances. A “finish” sheet of plywood, used for surfaces like cabinets or furniture will be sanded. In addition, plywood comes in many types. The amount of glue will swell the wood slightly during manufacturing it will then shrink as it dries. Plywood also uses glue to hold the various sheets together. This means that a sheet of plywood that started at 3/ 4” may shrink slightly after manufacturing. First, wood shrinks as it dries and moisture leaves the wood. There are a few reasons why the actual thickness of plywood varies. Why is a 3/ 4” Sheet of Plywood Less Than 3/ 4” Thick? For example, a floor may need to meet up with another material in an adjacent room you need to know the exact thickness of the underlayment and the material on top to match it with the next space. Likewise, if you are using plywood as an underlayment, you often need precise measurements of the height of the finished surface. Precision is important for trim carpentry as well when installing wainscoting panels, if a cut doesn’t match the exact plywood thickness the final result will have noticeable gaps. Therefore, a multi-ply sheet with 9 plies that measures a nominal 3/4″, will be stronger than a sheet with 5 plies that also measures 3/4″.įor some applications, such as sheathing a roof, 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.įor example, a groove for a cabinet door panel needs to be the exact thickness of the plywood, or the door will not be stable due to the loose fit of the parts, and it will likely rattle each time it’s opened or closed. It is important to keep in mind, that regardless of the thickness of the sheet, that the more plies it has, the stronger it will be. So, a 3 ply sheet – one of the most common – may measure 2mm or 3mm in thickness, depending on what wood was used in its manufacturing. Keep in mind, that while many sheets of plywood are also sold by the number of plies, that veneers and plies can have different thicknesses as well, depending on the type of wood used. This may vary by manufacturer, though, so always check if you need a precise size or measurement. 1-1/4″ and 1-1/8″ plywood sheets are generally true sizes and not nominal. The exception to this rule is plywood sheets that are over an inch thick. A 1/ 4” sheet is actually 7/ 32” thick. A 1/ 2” sheet is actually 15/ 32” thick.
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