Wood I-joist Size | What size i joist to span 24 feet

The size of an I-joist required to span 24 feet depends on several factors including the load it needs to support (live load and dead load), the spacing between joists, and the specific type of I-joist being used (different manufacturers may have slightly different specifications).

Generally, for residential construction, an I-joist with the following characteristics might be appropriate:

1) Depth: 9.5 inches to 16 inches
Spacing: 16 inches on center (OC) or 24 inches OC

2) Live Load: 40 pounds per square foot (psf) (standard for residential floors)

3) Dead Load: 10-20 psf (depending on flooring materials and other permanent loads)

Here are a few examples based on typical I-joist manufacturer recommendations:

1) 14-inch depth of I-joist is suitable for a span of up to 24 feet with flange width of 3-1/2" at spacing of 16 inches O/C and total load of 50 psf (Live load = 40 psf, dead load = 10 psf) and deflection limits of L/480.

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