Wood roof rafters are sized based on one of eight tables found in the code. In this post we will learn how to correctly size a roof rafter based on its span, spacing and species of wood used.įun Tip: To learn the difference between the International Residential Code (IRC) verses the International Building Code (IBC), be sure to check out this POST. Section R802.4 outlines the wood roof rafter framing criteria which also includes prescriptive span tables. Please be aware of which version of the IRC you are using since the allowable spans can vary.) For the purpose of consistency, this post will reference the 2018 IRC. The allowable roof rafter span tables in the 2018 version are found in section R802.4 while the tables in the 2015 version are found in section R802.5. (Note: the table references have changed in the 2018 version of the IRC. The design and construction of wood roof rafters are found in Section R802.4 of the International Residential Code (IRC). In this post we will cover wood roof framing members, specifically roof rafters. The International Residential Code (IRC) recognizes two types of conventional roof and ceiling framing systems for buildings that are subject to the International Residential Code (IRC): wood framing and cold-formed steel framing. Roof/ceiling members must be properly designed to ensure they provide adequate support as required by the loads that are imposed on them as well as making sure these loads are correctly transferred to the supporting walls and/or supporting structural elements. Want to learn how to easily size roof rafters?Ĭhapter 8 of the 2018 International Residential Code (IRC) regulates the design and construction of roof and ceiling systems. How to Size Ceiling Joists Per the IRC | Easily Explained with Examples.How to Size Floor Joists Per the IRC | Easily Explained with Examples.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. 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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