ALLOWABLE SPANS FOR FLOOR JOISTS Lumber: #2 or better douglas fir-larch. Max. fiber stress: ... Wood Frame Span Tables ... Lumber: #2 or better doug fir-larch or doug ...
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The following table illustrates how far floor joists of a given height, grade and species can span and still meet the design criteria set forth by most ceramic tile associations. Contact a structural engineer if you have doubts about laying ceramic tile over floor joists.
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The spans in these tables were determined on the same basis as the code-recognized Span Tables for Joists & Rafters and Wood Structural Design Data, both published by the American Wood Council; concentrated loads and uplift loads caused by wind were not considered.
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A look at an actual current joist span table will show that depending on the wood species, the allowable spans for a 2x8 floor joists with 40 pound live load with deflection limit of span/360, ranges from 10'5" (Western red cedar) to 12'9" (Doug fir-larch).
4) See A.1.3 for 2 span floor joist requirements. Table 9.2 Adjustment factors for alternate loading and spacing conditions for determining required compression perpendicular to grain design values (F
For a beam that is a full 2 inches wide and 9 inches deep, using an allowable stress of 1500 psi for the wood, the maximum deflection for a 50 psf floor load (40 psf floor plus 10 psf dead load) would be 0.3 inches, for a d/L of about 550, assuming the joists are spaced 12 inches OC with a 15'3" clear span.
One good reference is Washington State University's Maximum Span Calculator for Joists and Rafters, which allows you to enter factors such as wood species, size, grade, and deflection limit in order to calculate spans for both live and dead loads.
Common joist spacings for 2-by-10 joists and other dimensional lumber sizes are 12, 16 and 24 inches. Joists that are closer together can support more weight, which allows the joists to span a longer distance than joists spaced further apart.
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Dimensional lumber is cut to a specific length, width, and depth. However, there is a difference between the nominal size (what the lumber is referred to) and the actual size.
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