Sizes

Canadian plywood is manufactured in several sizes and thicknesses as shown in Table 2 and Table 3.

Table   2: Plywood Thicknesses
Thicknesses Unsanded Thicknesses Sanded
Select Tight Face, Select and Sheathing Good Two Sides and Good One Side
Metric (mm) Approximated Imperial (in.) Metric (mm) Approximated Imperial (in.)
7.5 5/16 6 ¼
9.5 3/8 8 5/16
12.5 ½ 11 7/16
15.5 5/8 14 9/16
18.5 23/32 17 21/32
20.5 13/16 19 ¾
22.5 7/8 21 13/16
25.5 1 24 15/16
28.5 1-1/8 27 1-1/16
31.5 1-1/4 30 1-3/16
Notes:1.plywood has been made in metric thicknesses since 1978. However, some, but   not all thicknesses are still available in approximate Imperial sizes: 6mm   (1/4″), 9.5mm (3/8″), 12.5mm (1/2″), 15.5mm (5/8″), 19mm   (3/4″), and 25.5mm (1″).2.and groove plywood is usually available in Sheathing, Select, and Select   Tight Face Grades in thicknesses of 12.5mm and greater.3.thicknesses are available on special order.
Table   3: Panel Sizes
Metric (mm) Imperial (in.) Imperial (ft)
1220 x 2440 48 x 96 4 x 8
1220 x 2740 48 x 108 4 x 9
1220 x 3050 48 x 120 4 x 10
1220 x 2400 47.2 x 94.5  
1220 x 2500 49.2 x 98.4  

Measuring plywood thickness.Thicknesses of sheathing panels, although stated in metric terms, remain similar to those Imperial thicknesses established through experience and traditional usage. The thicknesses for sanded (Good Two Sides and Good One Side grades) and unsanded (Select Tight Face, Select, and Sheathing) grades for DFP and CSP plywoods are given in Table 2.

Plywood is most commonly available in sheets 1220mm (4′) wide by 2440mm (8′) long. It is also available in a metric size of 1200 x 2400mm. Other sizes are manufactured to fill custom orders.

Common panel sizes are listed in Table 3.