Common – Truss configurations for the most widely designed roof shapes.
Mono – Used where the roof is required to slope only in one direction. Also in pairs with their high ends abutting on extremely long spans with a support underneath the high end.
Scissors – Provides a cathedral or vaulted ceiling. Most economical when the difference in slope between the top and bottom chords is at least 3/12 or the bottom chord pitch is no more than half the top chord pitch.
Flat – The most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7% of the span in inches.