Structural member in a roof / From Wikipedia, the free encyclopedia
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A purlin (or historically purline, purloyne, purling, perling) is a longitudinal, horizontal, structural member in a roof. In traditional timber framing there are three basic types of purlin: purlin plate, principal purlin, and common purlin.
Structural member in a roof
Purlins also appear in steel frame construction. Steel purlins may be painted or greased for protection from the environment.