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Helping You Make Your Home Your Castle |
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Scissor Truss Design
Roof Framing with Trusses
Using scissor trusses to form a
cathedral ceiling is a much better choice than
trying to build scissor trusses in place. Normally
the slope of the interior ceiling is always
controlled by the slope of the exterior roof pitch
in traditional roof framing. With pre-built trusses
you can have the interior ceiling pitch at just
about any angle you want, well within the
structural limits of the truss design. Scissor
truss design is actually quite easy with the home
truss design software available today.
Designing scissor trusses that will carry the roof
loads is just a matter of plugging in the house
specifications of width and desired roof slope and
presto, the truss design is ready for the
manufacturing process. They are called scissor
trusses because the resemble an open pair of
scissors.
A scissors designed truss provides roof support and
at the same time giving your ceiling a vaulted
interior. However,
the closer you get the interior ceiling slope to
the actual exterior roof slope there is a negative
impact of the interior truss components. A true
cathedral ceiling using regular rafters rather than
trusses mimics the actual roof slope because each
rafter actually becomes a large beam.
It is common is modern construction to mix trusses
in the roof framing. Over part of the home there
can be scissors trusses, while over another part
you can have common trusses such as over bedrooms
or the garage. This is a good idea so you can have
attic storage space above those areas. From the
outside of the house the roof looks the same with
the roof slope of all the trusses the same.
Framing house roofs with trusses, particularly
scissor trusses for vaulted ceilings, is much
easier than when the trusses had to be built on
site. The trusses are set in place, either sixteen
or twenty four inches on center and nailed to the
wall plates.
Related subjects:
Framing Walls | Wall Framing Layout
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