Purlin Rafter Roof Construction

Building control guidance note purlin and rafter roofs timber sizes and construction details author.

Purlin rafter roof construction.

The roof support system is a ridgepole and either rafters which run perpendicular from the top of the walls to the ridge or purlins which run parallel to the ridge. 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 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. The purlins are in turn supported by rafters or walls.

Purlins are supported either by rafters or the walls of the building. A common arrangement is a rafter and purlin system which combines purlins and rafters. Purlin roof structure civil engineering design 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.

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