Most plywood products are most commonly available in standard 4′ x 8′ sheets, although Baltic Birch is more commonly available in 5′ x 5′ sheets. However, there are a number of possible sizes that are available. Baltic Birch is not the only plywood product manufactured in 5′ x 5′ sheets, many hardwood plywoods are also produced in this size. While the 4′ x 8′ sheet size is the most common, many types of plywood are also produced in 4′ x 10′ and 4′ x 12′ sheets. OSB is manufactured in sheets up to 24′ long.
Nominal and Actual Thickness
There are two different thickness definitions we need to keep in mind when talking about plywood; that of nominal thickness and actual thickness. Just like dimensional lumber, most plywood is rated at a nominal thickness; that is the thickness before it is sanded. The actual thickness is just like it sounds, the actual thickness of the plywood panels you buy, after sanding. Typically, the actual thickness of plywood is 1/32 inch less than the nominal thickness.
The table represents the comparison between nominal and actual softwood plywood thickness:
Nominal ThicknessActual Thickness