Common Trusses with a 4/12 or 5/12 pitch..Common (or standard) trusses are symmetrical and have standard 4″ heels. A truss with the same pitch and heel on both sides and a peak at the center is called a common truss
A scissors truss is a kind of truss used primarily in buildings, in which the bottom chord members cross each other, connecting to the angled top chords at a point intermediate on the top chords’ length, creating an appearance similar to an opened pair of scissors.
The simplest way to get a vaulted ceiling is by setting vaulted roof trusses. Roof trusses are built in a truss-manufacturing warehouse and delivered preassembled to the job site. Unlike the heavy lumber required for rafters, trusses contain a number of smaller members, engineered to withstand heavy loads