Patent ID: 6912787

Claim:
A method of forming a joist assembly comprising: forming a top chord having spaced-apart lips; forming a bottom chord having spaced-apart lips; bending a length of continuously square tubing into a serpentine configuration such that said length of continuously square tubing has upper bent portions and lower bent portions; positioning said upper bent portions into said top chord; positioning said lower bent portions into said bottom chord; and welding said length of continuously square tubing to said top chord at an outer surface thereof in fillet areas defined by opposite exterior surfaces of said length of continuously square tubing and respective bent edges of said spaced-apart lips of said top chord; and welding said length of continuously square tubing to said bottom chord at an outer surface thereof in fillet areas defined by opposite exterior surfaces of said length of continuously square tubing and respective bent edges of said spaced-apart lips of said bottom chord.