Use a track saw to trim the top 20-3/4-in. off the 4×8 sheet. Set it aside for the cutting of the corbel template and all the corbels (A). Cut 16 strips of plywood measuring 2-1/2-in. wide from the ...
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OSB vs. Plywood: Which Is Better?

Oriented Strand Board (OSB) doesn't look as good as plywood, but the two are virtually equal in terms of structural stability. Plus, OSB is cheaper.