Plywood and particle board have long been used for structural and non-structural parts, as well as cores for composite and molded parts. Unfortunately, both materials are prone to warping and rotting.

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 ...

The U.S. Structural Plywood Integrity Coalition is suing two certification firms and the overarching service that accredits them. (Courtesy Freres Lumber Co.) “No one cared,” he said. Freres and the ...