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3-8. Purlins

Purlins are used in roof construction to support corrugated sheet metal if it is used or to support the sheathing of roofs famed with trusses. In small roofs, short purlins are inserted between the rafters and nailed through the rafters. In large buildings where heavy trusses are used, the purlins are continuos members that rest on the trusses and support the sheathing. In small buildings, such as barracks, mess halls, and small warehouses, 2 by 4s are used for purlins, with the narrow side up (see Figure 3-24 ).

Figure 3-24. Purlins

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