Graphical Construction Glossary >> Roofs and roofing. >> common rafter
Also known as an intermediate rafter and a spar rafter.
The commons are the rafters in a roof surface that are square off the hip. We some times call the hip and valley timbers rafters, but common ones generally are the base of a roof, the first ones to be fixed that define the height and slope of a particular roof. Gable roofs consist of all commons while pavilion roofs may have none
On old trussed roofs, and on other large span roofs the commons are often lap joined on top of under purlins.
A typical common has angled side cuts and square top cuts.
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