Oddgeir Kvien wrote:

We all knows that pine plywood do check, but what about birch plywood?

The birch plywood found in local home depot here in Norway is usualy in
very good quality and might be a very attractive alternative to use for
building material. It is somewhat heavy, but it is very strong, probably
the strongest plywood available.

Most =all= plywood will 'check'.

Rotary peeled 'veneers', by nature, have a 'tite' side & a 'loose' side.
Sliced veneers too, to a lessor extent.

Exposure to moisture, and the 'attendant' expansion/contraction ,
will "bring" the lathe 'checks' to the surface.

Excessive finish(face surface) sanding exacerbates this ...
brings the 'checks' closer to the surface.

The "least" checked veneers, generally, are the thinner ones ...
fir 3/16th core veneers are the most pronounced.

Sawn/planed 'veneers' dont do 'this', and are expensive.

:-)