I am planning on building another light wind plywood board. Simplicity and function is they main focus. Board size ether 142x43 (Door) or 150x41 (Like the Slingshot Glide).
My last couple of boards I've built with 1/2" Sandeply from HD. http://www.homedepot.com/p/Unbranded-12
This worked out great but thought I'm going to try something different after reading other peoples ply projects.
Now I am thinking of getting 1/4" Birch plywood and glue two layers together with the top layer about 2" shorter and narrower. http://www.homedepot.com/p/Unbranded-1-
Finish will be a few layers of Spar Urethane. Not planning on any glass layup.
Here is my concern, the 1/4" birch is actually only 0.203" thick. Will two layers of it be strong enough? Will it be too flexible and snap too easily? If I would add a 3rd layer under footstraps I end up heavier than using the 1/2" ply and would defeat the purpose.
Has anybody used 1/4" birch in two layers with only Spar Urethane finish? Was it strong enough?
Thank you for any input.