Beams:
a) Rectangular Beam (RB) -
Typical beam width = 12" or 16"
Spans up to 50’-0"
Typical designation = 16RB24 (16 = width in inches, 24 = depth in inches)
b) "L" and "IT" (inverted "Tee") beams (LB and IT) -
Typically used to support slabs, walls, masonry, and beams
Typical beam width = 12"
Depths of 20", 28", 36", 44", 52" and 60