Top Chord Bearing Roof Truss

A top chord bearing truss is used to support the second story floor assembly.

Top chord bearing roof truss.

Factors that determine the size of the top chord include on center spacing dead and live loads applied to the truss span and pitch applied to the top chord. The ends of these trusses are visible on the exterior. I am not used to seeing this method and wanted to see if anyone knows if truss joinsts can now be engineered this way. At the forefront of the sbc industry testing task group s work is the top chord bearing of parallel chord trusses testing project.

When i place a bottom chord bearing 20 hh truss ontop of my walls it leaves the truss ends open below my soffit due to the tall heel height. If the bearing is below the truss bottom chord the end vertical of the truss can extend down to sit on the bearing. When the 4x4 block length is extended this is referred to as mid chord bearing. Truss a pre built component that functions as a structural support member.

Vs top to facsia measure. Fan trussa floor truss with 30 top chord panels and 60 bottom chord panels and a fan web configuration. Issue top chord bearing truss in conventional residential construction framing in phoenix arizona consumed considerably more wood than should have been used resulting in extra costs of both time and materials. Top chord bearinga floor truss support condition in which the truss load is transferred to the bearing or support through the top chord and 4x4 block end detail.

Extended top chord bearinga floor truss sup port condition in which the truss load is trans ferred to the support through the top chord member extending to sit on the support. This project is an examination of the bearing capacity limits established in ansi tpi 1 2007 section 7 4 2 and table 7 4 1. If you look closely i hope you can see that the top chord extension is also being used as bearing. Sometimes the bearing sits between the top and bottom chord of the truss and a mid height bearing the 2x6 vertical shown in the image below will be used.

Trusses can be designed to have support right under the top chord. Told me that the heel height for these trusses would be around 20 but if i wanted to do a top chord bearing truss i could reduce the heel height to. The top chord is intersected by the bottom chord and web members at various points through the truss creating a joint that is secured by metal connector plates. This truss can be used when greater area is needed for solar panels on one side of a roof or if the building owner wants to put windows in the vertical portion of the top chord to allow light into the building.