These span tables for joists and rafters are calculated on the basis of a series of modulus of elasticity (e) and bending design values (f b) This guide provides detailed tables, charts, and formulas to help you calculate joist span, spacing, and size for residential and commercial construction projects. Additionally, compression perpendicular to grain design values (f c⊥) are included as a consideration for selection of joists and rafters.
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Design information including span charts, load tables, allowable holes, framing connectors and more.
Joist and rafter span tables show the maximum distance these framing members can safely cover
The spans listed are based on the specific properties of the wood being used. Learn more about bci® joists and our sizing software bc calc® or view the us east and us west span and size charts. Joists and rafters spfa has created 46 simplified maximum span tables based on common load conditions for floor joists, ceiling joists, and rafters for selected visual and mechanical grades of southern pine lumber in sizes 2×4 thru 2×12.
