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Scissors Truss Design

Scissors Truss Design

A scissors truss is a really cool roof framing option. You not only get the speed of framing that you get with common trusses, but also the added benefits of an interior sloped ceiling. The slope of the interior ceiling is always controlled by the slope of the exterior roof surface. The companies that fabricate the trusses use sophisticated software to design the trusses. You provide the span of the roof and the desired exterior roof pitch and the software does the rest. You can ask the structural engineer at the truss fabrication plant if there is a way to increase the interior slope, but I doubt you will get much more than one half the slope of the exterior roof surface.

This scissors truss provides support , while providing a vaulted interior.

This scissors truss provides support , while providing a vaulted interior.

Remember, the closer you get to the actual exterior slope, you negate the impact of the interior truss components. A true cathedral ceiling using regular rafters mimics the actual roof slope because each rafter becomes a large beam.

Remember you can mix and match trusses! Over part of your home you can have scissors trusses, while over another part you can have common ones and over the garage you can have attic or storage trusses. The cool thing is that from the outside no one would ever know since the exterior roof slope of all the trusses is identical. Ask your builder to explore all truss options!

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3 Responses to Scissors Truss Design

  1. I'm adding an addition to a ranch house which has scissor trusses throughout. I'd like to add a saddle to one section of scissor trusses without adding a bottom chord.

    Is this possible?

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