Purlin Rafter Roof Construction

The purlins are in turn supported by rafters or walls.

Purlin rafter roof construction. A common arrangement is a rafter and purlin system which combines purlins and rafters. Metal building purlin spacing metal roofs are often referred as tin roofs in the past because of the use of tin such as aluminum or stainless steel sheets as the materials. Compared to conventional roofing system it might be a bit pricier in terms of installation but also has longer durability to provide better value for the future. Roofs and not for traditional purlin and rafter roof construction.

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. Building control guidance note purlin and rafter roofs timber sizes and construction details author. 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. J l neal subject.

Purlins are supported either by rafters or the walls of the building.