Exposure 1 grade plywood is approved for exterior use by which organization?

• A. American Institute of Architects
• B. American Plywood Association
• C. National Roofing Contractors Association
• D. OSB Manufacturers Association

Answer: (B)

Exposure 1 is a moisture-exposure rating assigned to plywood, indicating it can handle moisture during construction and short-term exposure before being covered or sealed. The organization that tests and certifies these plywood grades for exterior use is the American Plywood Association. They set the standards and label panels so builders know which products are approved for exterior conditions. The other groups listed do not certify plywood exposure ratings.