Purlin Roof Definition

A horizontal member in a roof.

Purlin roof definition.

Roof sheets are connected with purlins. Of uncertain origin collins english dictionary complete and unabridged 12th edition 2014 harpercollins publishers 1991 1994 1998 2000 2003 2006 2007 2009 2011 2014. Purlins support the loads from the roof deck or sheathing and are supported by the principal rafters and or the building walls steel beams etc. In architecture or structural engineering or building a purlin or purline is a horizontal structural member in a roof.

In architecture structural engineering or building a purlin or historically purline purloyne purling perling is a horizontal beam or bar used for structural support in buildings most commonly in a roof. Building a horizontal beam that provides intermediate support for the common rafters of a roof construction. Uniformly distributed roof load is carried by purlins. Also known as sheeting rails purlins create the roofing members of the secondary framing of a steel building.

There is no direct connection between roof sheathing and truss top chord. The roof beams spanning between the trusses are known as purlins. The purpose of purlins. Purlin definition a longitudinal member in a roof frame usually for supporting common rafters or the like between the plate and the ridge.

These structural supports run perpendicular across the rafter beams. In steel construction the term purlin typically refers to roof framing members that span parallel to the building eave and support the roof decking or sheeting. Purlins are connected with panel points of the truss. Purlins are most commonly used in metal building systems where z shapes are utilized in a manner that allows flexural continuity between spans.

A common arrangement is a rafter and purlin system which combines purlins and rafters. A horizontal member in the roof. The purlins are in turn supported by rafters or walls.