Structural Residential Roof Truss Design

The long sloping beams extending to the top of the truss and the beam that runs horizontally along the bottom are called chords.

Structural residential roof truss design.

Photo gallery video gallery residential steel trim selector post frame trim selector projects. A truss is a prefabricated wooden structure that integrates a triangular webbing of structural members to provide support for the roof above while tying the outside walls of the house together. This is crucial for truss design because otherwise the trusses may not be built to handle the appropriate load. Roof and wall sheathing gravity and wind loads floor diaphragms and shear walls in plane lateral overturninand g loads 6.

Structural model of truss truss girder self wt 4 05 k 4 05 k 80 ft x 25 ft 2 03 psf 18 03 psf bar joist wt 9 plf pd int dead load at an interior panel point 18 025 psf x 25 ft x10 ft 4 51 k due roof ceiling wt truss girder 9 plf x 25 ft 0 225 k due purlin wt 4 73 k pd. It s often used for sheds garages or extension of an existing roof. In residential construction timber roof trusses have been used for decades to support floor and roof systems. A mono truss is a one sloped truss that forms a right angle triangle.

The chords are located at the top and bottom of the truss. This article will focus on timber roof truss design in residential construction. The attic truss is able to support more load than a standard truss of the same span and pitch. Chord members web members and connections.

In this type of truss roof a high collar beam and two struts make a wide and open expanded area which forms a wide livable space. Typically the building designer or builder will contract with the truss fabricator who will supply a truss layout and a structural design of each significant element of the roof system. A mono truss roof allows for more sunlight and visual space proper drainage and relatively cheaper. Attic truss roof design is intended to provide a solution for additional living area within the roof space.

Residential structural design guide 3 3. Trusses have several key components. Shop roof trusses spacer floor truss. Roof rafters trusses and beams.

The truss plate manufacturer s engineer usually reviews and seals the individual truss designs on behalf of the truss fabricator.