Professional training would be good for most of the Plywood QC/QA Parts 83:CHECK THE PLYWOOD CORE PLIES

Check the plies
Plywood typically comes in an odd number of plies in order to achieve balanced construction. The number of veneers on each side of the core layer must be equal in number (and thickness) or the panel may warp. The plies should be parallel to one another with alternating layers set at 90° or warping can occur. When you buy plywood, lay the sheet down on the ground. If it’s curled or twisted and doesn’t lie flat, don’t buy it. Select plywood where the total thickness of the two outer plies equals the thickness of the core.

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