TABLE 3 - "C" Joist Allowable Spans Series - CS, 1-5/8" Flange, 18,16,14 Guage - 14 Series - SCS, 2" Flange, 18,16,14 Guage - 15 Series - XXC, 2-1/2" Flange, 18,16,14 Guage - 16