Lightweight roofing systems often translate into rafters with a greater span and spacing since they don’t have to withstand much loading.Ī heavyweight roofing system with a large snow load requires a compact rafter system with individual rafters having reduced spans.įor generalization, it is recommended that rafters made out of Douglas Fir-Larch should have a span ranging from 26’0” to 17’2”.Ģx10 Hem-Fir rafters can span more than 26' and must not span less than 16’9”. Since one of the rafter's primary purposes is to withstand and transfer loads from the roof to the supports, their spans heavily depend upon the roofing configuration. The table below shows the maximum span ranges for a 2x10 comprised of four timber species.įor a detailed breakdown of span ranges in accordance with spacing and Grade of Timber, refer to the table R502.3.1 of the IRC 2021. The spacing determines the quantity of material required for constructing the structural framing system.Īlong with spacing, the grade of timber is influential in determining the maximum load-carrying capacity of the wooden element and, in turn, influences the span. IRC 2021 categorizes the maximum spans based on their spacings and species. 2x10 Span as Floor Joists 2 x10 Floor Joist The International Residential Building Code (IRC) provides information on the load-bearing and spanning capabilities of different grades, species, and sizes of construction timber. You can use a 2x10 construction wood as a floor joist, rafter, beam, header, or as framing component for the ceiling. The end-use of a structural component refers to how it is being used. Key factors to take into account include lumber species and its grade, subjected loads, spacing between two members, and the structural component’s end-use. The span or the length of the room that a 2x10 can cover is not solely dependent on the wood itself. How Much of a Span Can 2x10 Support on its Own? This article lists the maximum span of 2 x 10 under different situations for varying species of lumber. These values apply to Southern Pine Species. 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.A 2x10's maximum span depends on where it's used.Īccording to IRC 2021, a 2x10 with 16-inch spacing can span up to 18'-9" as floor joists, more than 26' as rafters and ceiling joists,4'-3" as beams, and 7' as headers without providing additional support. 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. 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. Forest Products Machinery & Equipment EXPO.Headers & Beams : Allowable Load Tables.Headers & Beams : Size Selection Tables.
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