Roof Truss Load Transfer

In this video the load transfer mechanism from roof of the building to the foundation of the building is explained.

Roof truss load transfer.

Typically roof live load is snow while floor live loads are furniture human occupancy storage. Loads are transferred downward and outward through sloping rafters the lower ends of which rest on the top plates of the exterior walls. 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. Live loadany temporary applied load to a floor truss chord.

Trusses must be designed for any special loading such as concentrated loads from hanging partitions or air conditioning units and snow loads caused by driftingnearparapetorslide offfromhigherroofs. The decking transfers the load to the purlins. To achieve maximum indicated spans trusses may require six or more panels. Hence the length of the purlin is equal to the width of the bay i e the spacing of the trusses.

The purlins transfer the loads to the roof beams as concentrated loads. Roof trusses support a roof s weight by transferring the weight load downward and outward to the building s bearing walls. Trusses like all structures are devices for transferring loads from where you don t want them to where you do. Common design practice for trussed roof and floor diaphragms in light frame construction relies on drag trusses to serve as boundary elements boundary members and their connections and provide the primary and or auxiliary load transfer mechanism configured to carry in plane axial tension and or compression forces to the shear walls below.

Load bearing walla wall specifically designed to transfer a roof load and or upper floor load into the foundation. The portion of the roof contained between successive trusses is called a bay. Common design practice for trussed roof and floor diaphragms in light frame construction relies on drag trusses to serve as boundary elements boundary members and their connections and provide the primary and or auxiliary load transfer mechanism configured to carry in plane axial tension and or compression forces to the shear walls below. Load path loads on the roof are initially supported by the decking.

A roof truss takes the weight of the roof and the snow on the roof if you live in that kind of climate and transfers it out into the load bearing walls of your house.