Timber Roof Purlins

There is an available purlin for every type of roofing material including purlin span for metal roof which is the most common material type to use this item.

Timber roof purlins.

Purlin is a well known material in the field of architecture structural building or structural engineering. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Purlins are installed horizontally under metal roofs. They give added support to the roof and also provide a nailing surface for the end panels and drip edge.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. The purlins are the large beams perpendicular to the rafters. Purlins are 2 by 4 feet and are installed much like metal roofing. Purlins are a series of horizontal timbers laid across or connected to as depicted above the principal rafters and support the roof covering typically 2 6 tongue and groove boards conventional or structural insulated panels sips and roofing.

Under purlins were typically propped off internal walls. They meet at the top of the gable at a ridge beam which has extra bracing to attach it to the rafters. The rafters are the beams of wood angled upward from the ground. It is a horizontal bar that used to support building at the roof structurally.

Do all roofing projects require purlins. In lightweight timber roof construction under purlins were used to support rafters over longer spans than the rafters alone could span.