3.4.1 Exposure Durability Classification

Plywood is classified as interior or exterior. The classification is made on the basis of the resistance of the glue bond to moisture, which is affected by the adhesive used, the veneer grade, and the panel construction. Plywood is made in four exposure durability classifications: Exterior, Exposure 1, IMAGE (Exposure 2), and Interior. Exterior type is made with 100 percent waterproof glue.