What is the biggest span a sheet of plywood can be used for, as floor decking, if it has an ID index panel of 32/16?

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The correct answer is indeed 16". A sheet of plywood marked with an ID index panel of 32/16 indicates its load-bearing capacity and suitability for various applications. The first number (32) represents the maximum span, in inches, for roof applications, while the second number (16) indicates the maximum span, in inches, for floor applications.

In the context of using plywood as floor decking, the 16" span signifies that the panels can be spaced at a maximum of 16 inches apart when laid flat. This configuration allows for adequate support and minimizes the risk of deflection and damage under load. Using 32" as a floor span would not be appropriate, as it exceeds the recommended spacing for achieving stability and strength. Therefore, adhering to the specified 16" spacing ensures the safety and integrity of the flooring system.