The gambrel roof has two slopes on either side of a center ridge. The lower slope is steeper than the upper slope. It is used mainly on two-story barns up to 40 feet wide. The most common type of framing is light, clear-span braced rafters supported on the barn wall and anchored to the floor joists to resist horizontal forces and uplift.
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This work is supported in part by New Technologies for Agriculture Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.
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