principal rafter
noun
a diagonal member of a roof principal, usually forming part of a truss and supporting the purlins on which the common rafters rest.
Origin of principal rafter
1First recorded in 1655–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use principal rafter in a sentence
Two sketches are shown at the joining of the tie beam and the principal rafter.
Woodwork Joints | William Fairham
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