Darro wrote:
Can anyone tell me which of two plywood sheet configurations would be
the stiffest, or do they have the same stiffness?

Any other observations about the stiffest configuration of plywood
sheets under 5/8" thickness?

Configuration 1:
A bottom layer of sheets of 1/4" plywood plus a top layer of 1/4"
plywood sheets overlaid in the centre of the lower layer's joints and
glued to the lower layer.

Configuration 2:
A single layer of 1/2" plywood with the same outside dimensions as
Assembly 1.

Thanks in advance for your helpful replies.

Darro

not enough info.

fwiw a wood frame sandwiched between the 2 would give even more
stiffness in some ways, less in some.

NT