Jun 06
Truss Joists are ideal for spanning distances longer than 16 feet since a 2 x 12 solid spruce joist might cost about the same these days, and you’ll get a couple of other advantages. You can run air ductwork right through the middle of the joists, and you can often forget the girder altogether and span the full width of the area with truss joists that could span 32 feet or more. Of course there are always other issues raised with this choice too, so study your plans.