![]() ![]() Neither SFPA, nor its members, have knowledge of the quality of materials, workmanship or construction methods used on any construction project and, accordingly, do not warrant the technical data, design, or performance of the lumber in completed structures. The conditions under which lumber is used in construction may vary widely, as does the quality of workmanship. However, the recommended spacing varies depending on the snow load in your area. The IRC specifies that the spacing of purlins and rafters should not exceed 24 inches on center. The design values contained herein are based on the Southern Pine Inspection Bureau’s Standard Grading Rules for Southern Pine Lumber (2002 edition with supplements) and modified as required by AWC’s National Design Specification® (NDS®) for Wood Construction (2012 edition).Īccordingly, SFPA does not warrant that the design values on which the span tables for Southern Pine lumber contained herein are based are correct, and specifically disclaims any liability for injury or damage resulting from the use of such span tables. One of the most important code requirements is the spacing of metal roof purlins and rafters. SFPA does not grade or test lumber, and accordingly, does not assign design values to Southern Pine lumber. The maximum spans provided herein were determined on the same basis as those in the code-recognized Span Tables for Joists and Rafters(2012 edition) and Wood Structural Design Data (1986 with 1992 revisions), both published by the American Wood Council (AWC). The primary purpose of this publication is to provide a convenient reference for joist and rafter spans for specific grades of Southern Pine lumber. If precamber is added it is visible in the SECTIONS list next to the sections name when you press Design and in the title of the CERTIFICATE and CALCULATIONS. Forest Products Machinery & Equipment EXPO.Headers & Beams : Allowable Load Tables.Headers & Beams : Size Selection Tables. ![]()
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