Which organization is responsible for plywood testing and rating?

The organization responsible for plywood testing and rating is the APA, also known as the Engineered Wood Association. APA provides a standardized system for the evaluation of engineered wood products, including plywood. This organization conducts rigorous testing on plywood to ensure it meets specific performance criteria including strength, durability, and safety. As a result, APA establishes grading rules that help manufacturers, builders, and consumers identify high-quality plywood suitable for various construction applications.

In contrast, the other organizations listed focus on different areas. The EPA deals primarily with environmental protection and regulations. MIOSHA is concerned with occupational safety and health in Michigan, and the IRC is a set of model codes that govern residential construction but does not conduct testing itself. Understanding the specific roles of these organizations highlights why APA is the correct answer regarding plywood testing and rating.