I Joist Roof Span Table

Span calculator for wood joists and rafters also available for the android os. Use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. This performance standard provides an easy to use table of allowable spans for applications in residential floor construction allowing designers and builders to select and use i joists from various member manufacturers using just one set of span tables.

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I joist roof span table.

High pitch 6 12 to 12 12 16 17 load bearing cantilever tables 18 21. Apa performance rated i joists pris are manufactured in accordance with pri 400 performance standard for apa ews i joists form x720. Also available for the android os. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center.

For the bird s mouth roof joist bearing detail. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter. Web stiffeners shall be cut to fit between the flanges of the lp solidstart i joist leaving a minimum 1 8 gap 1 maximum. Straight line interpolation shall be permitted for intermediate spans and design values.

Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability. Use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

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