A typical framing system for a raised wood floor includes three main structural elements: girders, joists and the subfloor. Tables provided below are intended to provide guidance on wood products commonly used in raised floor systems. Allowable loads or maximum spans are given for typical grades and sizes of the various structural wood products. These loads or spans were determined in accordance with appropriate standards assuming dry service and normal load duration. They are based on uniformly distributed gravity loads only.
Refer to referenced sources for more complete information and detailed requirements for each wood product.