SPF has a shorter span of 5’ 11 with 16 spacing. If you decrease the spacing to 12, which is recommended, then the maximum span can increase to 6’ 10. 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. When used as floor or deck joists, the maximum span for a high-grade 2×4 is around 6’ 2 for 16 spacing using Southern Pine depending on the other factors. The conditions under which lumber is used in construction may vary widely, as does the quality of workmanship. 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. SFPA does not grade or test lumber, and accordingly, does not assign design values to Southern Pine lumber. hese span tables for joists and rafters are calculated T on the basis of a series of modulus of elasticity (E) and bending design values (F b). Above we see the key to the lines in the rafter length table. For a common rafter, or for each of the other rafter types, these tables give the length of the rafter per foot of horizontal run. Whenever calculating of maximum scope of a rafter, use of horizontal distances between two vertically supports. To use the rafter length tables on the framing square blade front you need first to understand the type of rafter you are cutting. TJI 110, 210, 230, 360, 560 Bar Specifiers Orientation (Canada) Rafter Span Diagram. 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 second range table is to same as the primary, except that it assumes a ground snow load concerning 50 psf. The primary purpose of this publication is to provide a convenient reference for joist and rafter spans for specific grades of Southern Pine lumber. For a sheathed ceiling, the length shall be not less than 12 feet (3658 mm) for building widths less than 36 feet (10973 mm), or not less than 14 feet (4267 mm) for building widths greater than or equal to 36 feet (10973 mm).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |