20′ – 6×3

A purlin 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. Purlins also appear in steel frame construction. The timber purlins are made 6x3in treated timber. They are pre machine cut and available in sizes from 3.6m to 6.1m.