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APA - The Engineered Wood Association, a non-profit trade association with 70 years of experience, is the authoritative source for information on structural wood products and their related construction applications, APA The Engineered Wood Association is the place to learn about engineered wood. Glulam, I-joist, laminated veneer lumber, concrete forming, post frame, panelized roofs, walls, floors, plywood, rim board, osb, oriented strand board.