Roof Rafter, Joist and Beam Design Part 4 of Residential Structural Design Tutorial. On this page we will explain how to design with roof rafter span tables and how to read all types of joist and roof span tables for residential framing. This page is part of the Design Your Own House online tutorial.
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Span Tables Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. You can also use the Wood Beam Calculator from the American Wood Council website to determine maximum rafter and joist lengths.
Looking at page 4 on this deck worksheet, my tributary width is 6' (half of the total rafter length of 12'), and the chart allows my beam to span up to 13'3" with a 4x10. I am planning on using a 4x10, but this just seems on the small side compared to some other beam span tables I have looked at.
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Rafters, Tables 17-46 The loading conditions included in this document cover typical building appli - cations for wood roof snow loads from the governing building code. For roof live loads less than 20 psf, tabulated span lengths may be multiplied by the factors shown in the table above.