EWPAA Structural Plywood and LVL Design Manual - Engineered ...

2.7 Identification CodeThe plywood identification code provides information on the veneer arrangement within the structuralplywood and is required to establish section properties of a particular plywood. The I.D code gives thefollowing information: the nominal plywood thickness, the face veneer thickness multiplied by 10, andthe number of plies in the assembly. For example, the ID code 21-30-7 describes a 21 mm thick plywoodwith 3.0 mm face veneer thicknesses and 7 veneer layers. Standard constructions are given in Chapter 5,TABLE 5.2.2.8 Panel DimensionsLength and WidthEWPAA / JAS-ANZ branded structural plywood is commonly available in two standard sizes.(Length x Width)2400 mm x 1200 mm2700 mm x 1200 mmOther panel lengths are available including 1800, 2100, and 2250. Panel widths of 900 mm are alsoavailable from some manufacturers. Panel lengths may be intended to suit a particular end application.For example, 2250 mm length plywood is manufactured as flooring to suit the standard floor joist spacingof 450 mm. Flooring plywood is usually supplied with plastic tongue and grooved (T&G) edges. Plywoodbracing is available in panel lengths of 2440 and 2745 mm to allow for top and bottom plate coverage.Non standard panel sizes and larger panel sizes in scarf jointed form are also available from somemanufacturers.ThicknessA range of standard plywood panel thicknesses are available including 3, 4, 4.5, 6, 7, 9, 12, 15, 16, 17, 19,20, 21, 25 and 28 mm and thicker. Thickness availability will vary between different manufacturers and it isbest to check the thickness, stress grade and panel sizes locally available before specifying the plywood.Standard TolerancesStandard dimensional tolerances, as specified in AS/NZS 2269 for structural plywood, and measured inaccordance with AS/NZS 2098 - Method of test for veneer and plywood, are:Thickness:-Sanded sheets up to and including 7.5 mm thick +7%Sanded sheets over 7.5 mm thick and up to 17.5 mm thick +4%Sanded sheets over 17.5 mm thick +3%Unsanded sheets – as per sanded sheet tolerances plusan additional tolerance of +0.3 mmLength and Width:+1.5 mm9