These joists, which bear the name of SP-4, are deliverable in in 9 ½", up to 24" & + height. There is no real height limit, they will have the necessary height to support the floor loads for spans up to 39'-5".
Custom made, no adjustment necessary
Possibility of making specific spaces for mechanical components on request
Possibility of using the joists in top chord bearing configuration
Not adjustable, custom made
Price a little higher
These data are based on a spacing of 16" C/C of the joists and are calculated with live loads of 40 lbs/square foot, dead loads of 15 lbs/square foot and a deflection of L/360.
The span of 39' - 5" is not a limit, but rather the maximum span for a joist of 24" in height. There is always the possibility to make joists of this type with more height and thus to cover even longer span.