Flooring Softwood Lumber

Lumber manufactured from any of the coniferous trees and having a thickness of 5/16 (7.9 mm) of an inch to 3 5/8 inches (92.1 mm). Ordinary flooring for dwellings, offices and similar light duty will range from 5/16 of an inch (7.9 mm) to 1 5/16 inches (33.3 mm) in thickness, and will be dressed and matched. Factory flooring (including heavy roofing, decking and sheet piling) will range from 1 5/8 inches (41.3 mm) to 3 5/8 inches (92.1 mm) in thickness and from 3 1/8 inches (79.4 mm) to 11 1/8 inches (282.6 mm) in width and willbe dressed, matched and shiplapped or grooved for splines.