Comprised of timber beams connected with gussets, at the chords and diagonal bracing, to the main structural timber. Depending on the design of the truss, the bottom chord may carry the ceiling. Typically, the advantage of this type of roof support system is that it is rapidly erected and can carry long clear spans with the structural support being provided in the exterior wall. Generally the trusses or girders are included as the horizontal members in the complete frame components. In certain cases, a low frame cost could be used to account for just the vertical portions. This component would then be used for the horizontal supports.
The cost for lightweight trusses used in residential construction is included in the following roof structure components:
QCA (Tongue & Groove, Exposed Rafters)
QO (Wood Joists, Composition Deck)
Vertical supports, sheathing or roof cover.
Enter the following for this component:
Percent of Total Floor Area: 1 – 100, or
Roof Area (Square Feet)
Roof Structure