Steel joist spacing is dependent on if the roof or floor can span between the joists and if the steel joists can carry the load of the roof or floor. In general, 24 inches is a good rule of thumb for steel joist spacing unless noted otherwise by a structural or civil engineer.
Steel joist spacing is very dependent on the load that they are carrying, and size of the joists, as well as a number of other factors. To ascertain a spacing, be sure to consult with an engineer.
That said, often a designer will need to have a rough idea of steel joist spacing earlier in a project, before they have had a chance to consult with an engineer, and this short guide is for just such a circumstance.
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