Roof Anatomy
What is Rafter?
Roofing Glossary · Roof Anatomy
Definition
One of a series of sloped structural members that extend from the ridge board at the peak to the wall plate at the eave, forming the slope of the roof and supporting the decking. Unlike trusses, rafters are cut and assembled on-site and allow for an open attic. Rafter size and spacing are determined by span, load, and local building codes.
Related Roofing Terms
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TrussA prefabricated triangular structural framework of wood members used to support the roof deck and tr...
→DeckingAlso called sheathing, the decking is the structural boards or panels — typically 7/16" or 1/2" OSB ...
→RidgeThe horizontal peak at the very top of a roof where two sloping surfaces meet. The ridge is the high...
→Collar TieA horizontal structural member that connects opposing rafters roughly in the upper third of the roof...
More Roof Anatomy Terms
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