Girder trusses provide support for trusses that are cut short, for example, by a reverse gable or a skylight. They are often doubled- or tripled-up for strength.
In the program, trusses may not cross each other. If a truss is drawn past another truss crossing its path, the system automatically shortens it so that it butts into the existing truss.
Draw a new truss from an existing truss to the roof edge, as you would to draw a hip or end jack truss; or draw a truss between two trusses, forming a girder. This may be necessary for a large opening, such as a skylight.
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