Structural Residential Roof Truss Design

This article will focus on timber roof truss design in residential construction.

Structural residential roof truss design.

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. Chord members web members and connections. A mono truss is a one sloped truss that forms a right angle triangle. Trusses have several key components.

Photo gallery video gallery residential steel trim selector post frame trim selector projects. The truss plate manufacturer s engineer usually reviews and seals the individual truss designs on behalf of the truss fabricator. Roof and wall sheathing gravity and wind loads floor diaphragms and shear walls in plane lateral overturninand g loads 6. The long sloping beams extending to the top of the truss and the beam that runs horizontally along the bottom are called chords.

Chapter 3 design loads for residential buildings typical load combinations used for the design of table 3 1. 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. A mono truss roof allows for more sunlight and visual space proper drainage and relatively cheaper.

Typical residential loading covers standard decking and shingles metal along with the sheetrock on the ceiling. The chords are located at the top and bottom of the truss. 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. The attic truss is able to support more load than a standard truss of the same span and pitch.

Roof rafters trusses and beams. Overview building design truss design retaining wall design tall wall design requests. Residential structural design guide 3 3. Attic truss roof design is intended to provide a solution for additional living area within the roof space.

It s often used for sheds garages or extension of an existing roof.