ALSC Policy for Evaluation of Recommended Spans for Span Rated Decking Products
This policy provides a uniform method for assessing span rated decking products which are produced from many different species of wood, and graded under several different grading standards. This ALSC policy covers specific products classified by size as decking and are assigned a recommended span of usually 16 or 24 inches. The range of current grading rule specifications and species requires the establishment of a uniform common analytical procedure for assessing the appropriateness of these products relative to the recommended spans. This policy establishes this uniform analytical procedure.
An Adobe pdf version of the current policy is available here.