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  1. Joist span table - use these span tables to determine maximum spans based on the species and grade of lumber, the size of the floor joists, the spacing of the floor joists, and either of these two common design scenarios: Live load of 30 PSF / a dead load of 20 PSF / and a deflection limit of L/360. Live load of 40 PSF / a dead load of 10 PSF ...

  2. Simply reference Span Tables for Joists and Rafters published by the American Wood Council (AWC). AWC’s Appendix A lists a variety of live and dead load combinations for floors, ceilings and rafters. For example, Appendix A indicates that one type of clay tile roof system has a live load value of 20 psf and a dead load value of 15 psf.

  3. Table FJ-3 Design Criteria : Strength - 40 lbs. per sq. ft. live load, plus 10 lbs. per sq. ft. dead load. Deflection - Limited in span in inches divided by 360 for live load only.

  4. Lumber Span Tables for Spruce-Pine-Fir South (SPFs)** Ceiling Joists - 20 psf Live Load, 10 psf Dead Load, L/240 Deflection (Limited Attic Storage) Note: Deflection is limited to the span in inches divided by 360 for live load only. Maximum spans are inside to inside of bearings.

  5. Floor Joist Span Tables - Use these tables to determine the maximum span of a floor joist, given the size, spacing, species, and grade of lumber.

  6. Joist spans are based on 50 ksi for the 54, 68 and 97 mil thicknesses, and 33ksi for thinner members. Total load deflection= L/240. Live load as noted. Live load has been checked for unbalanced load contitions. Joist must be braced against rotation at all supports by track or blocking.

  7. 2 Joist deflection limitations are based upon L/240 for the total load (TL) and L/360 or L/480 for live load (LL). 3 For two equal spans, the listed span is the distance from either end to the center

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