"BobN" wrote in message
oups.com...
You can try the "sagulator" - a calculator for determining wood
deflection. For your dimensions (36x22), red oak sagged .04". They
didn't have oak plywood. Maybe someone can tell us how oak plywood
compares to solid oak strength-wise.

Here's the URL for the calculator:
http://www.woodbin.com/calcs/sagulator.htm

...bob

IIRC that is for solid wood, not plywood.