Joist Girders are open web steel trusses used as primary framing members. They support either open web light-weight steel joists or any other type of secondary beam, and transfer the loads to vertical elements, such as columns and bearing walls.

These members have been standardized for depths from 20 inches (508 mm) to 120 inches (3048 mm), and spans to 120 feet (36,576 mm) and share the same advantages of open web light-weight steel joist.