3/8/2024 0 Comments Rafter span table irc![]() For Stud grade, the base strength values are published on a 2×6 basis. For Construction Standard and Utility grades, the base strength values are published on a 2×4 basis (the size factor is always 1.0). For Select Structural, No.1, No.2 and No.3 grades, the base strength values are published on a 2×12 basis. Base values are provided for a base size that depends on the grade. Since different sizes of visually-graded lumber have different values, the design values shown in Table 4 are tabulated in a base value approach. dead loadĭeflection – Limited in span in inches divided by 240 for live load onlyīase Design Values For United States Only RAFTER SPANS IN FOOT-INCH 30# SNOW LOAD 10# DEAD LOAD L/240ĭESIGN CRITERIA: Strength – 30 lbs.
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