Structural I, also referred to as “STRUC I,” may be OSB or plywood and is, essentially, a subcategory of APA Rated Sheathing. Panels designated Structural I must meet all of the manufacturing and ...
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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.