from first hit on "wpb plywood":
If the wood is for external use, buy a more expensive ply laminate
that is waterproof - exterior WBP (Weather and Boil Proof) graded.
It appears that dyslexic plywood grading is fairly common, since wpb
and wbp seem to be used pretty interchangeably, at least in this site!
But maybe I'm missing a distinction here, that someone more familiar
with plywood will point out.
Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently.
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