1 Algorithm based on impact on opinions over time - and Wikipedia. 2  Top ten most significant in history puts Jesus in the number one spot.  The list also includes Muhammad, Lincoln, Hitler and Shakespeare.
Plies vary in thickness from 1.4 mm to 4.3 mm. The number of plies depends on the thickness and grade of the sheet but at least three are required as the minimum odd number of plies. Roofing can use the thinner 5/8 (15 mm) plywood.
The result is that the tendency for the boards to warp into their original shape is diminished as each board is pressed against the other layers. As a result, thicker plywood (say, 5/8â³ and above, which is made from 5 or more plies) is much less likely to warp than thinner plywood, such as 1/4â³ or 3/8â³.