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Posted by Henry G. on August 10, 2007, 4:08 pm
For any who might be able to offer some advice... I'm interested in
framing a gambrel roof on a building 28' wide, and am trying to avoid
the constriction of space. In all the reading I have done, there
appear to be three ways to create stability and structural strength in
the roof, either used alone or together. One is to support the lower,
steeper angles with verticals either under the purlins or as knee
walls closer to the eaves. The second is to connect the purlins with
collar beams. The third is to use engineered trusses. All of these
reduce the open space on the second floor of the building, either
restricting its width, or its height. For a building this wide (28'),
is it possible to avoid these entirely? Before I get to financially
invested in the project, I am just trying to see if such a thing is
possible. Some refer to doing "rigid framing", in which each rafter
joint is stabilized with extra material (plywood, metal plates?,
etc.). Is this mechanically acceptable? Thanks..
Henry
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