Roof Truss Support Walls

As each truss is put up on top of opposite walls it must be put up straight and supported while the next truss is put up.

Roof truss support walls.

Roof trusses can span much longer distances than joists so if you have a gable roof there is a good chance that it can span between exterior walls and not require an interior bearing wall for support. You will need an engineer involved in this since many contractors will tell you anything to get the job. To hold them up until the decking of the roof is placed on top a 12 foot 1 inch by 4 inch piece of lumber is used. 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.

Elements that make a roof truss bearing. A gable truss isn t structural and needs a continuous bearing support underneath such as a beam or wall. This means that at the top floor of a house the interior walls may not be supporting the weight of the roof structure and the weight of snow. Truss roofs are typically designed to use some interior walls as mid span support to save on costs associated with making the truss larger stronger.

They do this by means of top chords which are sloping members that extend from the peak of the roof to the top of the exterior walls at the eaves. Some roof truss types such as stub and dual pitch contain no center and therefore lack central support. Usually trusses are put 24 inches apart. Nearly all types of trusses used in roofs from kingpost and queenpost to bowstring and cambered possess a central support beam.

Roof trusses support a roof s weight by transferring the weight load downward and outward to the building s bearing walls. Gable trusses are more expensive than common structural trusses because more lumber is required. Engineered roof truss systems may be designed to eliminate the need for load bearing walls or change where the bearing walls are located.