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    by John Flanagan

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    Roofs Trusses

    To add a truss to the underside of a roof, go to the Structure tab and select the Truss tool. If no structural truss families have been loaded, the following request will appear.

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    Click yes and open the Structural Trusses folder in the UK library and select the Flat Truss, Gable Truss – 6 panel and the simple W Truss. Place a simple W Truss in a plan view following the prompts that appear in the bottom left corner of the Revit Interface. Switch to a section view and adjust the position of the truss if necessary. Change the detail level to Fine on the view control bar in order to see the truss properly.

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     All parts of the truss have been assigned a wooden element material.         

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    Roof trusses are sometimes used instead of the more traditional rafter construction. For a very simple roof shape, they can be more economical than rafter construction. The diagram below shows a typical roof truss. Note that the diagonal top chord member does not need to be notched to sit on the bearing wall (as in a rafter). Instead, the horizontal member (the bottom chord) of the truss sits flat on top of the bearing wall or beam.

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    A typical wood roof truss and its supports