Roof Framing Plan Roofing C Purlins

The purlins support the long span steel roofing but before the roof itself is put on a metal facia frame is installed around the perimeter of the roof.

Roof framing plan roofing c purlins.

In the past the majority of roof structures were of wooden construction but over the past 15 to 20 years there has been a vast shift away from wood to metal mainly steel roof construction. In their design life purlins are subjected to dead load e g self weight of sheeting materials and accessories live load e g. In addition our c section purlins can also be used for door framing roof trimming window trimming parapet rails and side rails also see z purlins page. 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.

During maintenance services and repairs and environmental loads e g. The shape of cee purlins does not allow end lapping they are butted together. Purlins traditionally support the roof deck cladding sheeting and are in turn supported by the principal rafters steel beams etc. Roof purlin needs no introduction to anyone in the construction industry.

Available in cee or zee shape red oxide primed or galvanized 16 14 or 12 gauge sizes from 4 up to 12 flange widths of 1 1 2 up to 4 cut to your specified lengths hole punching available load tables available for all material. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern. This frame supports and is hidden by a metal facia board.

Wind and snow load. Welded together they can be used as columns braces and ties. Besides providing support for the roof rafters and purlins add to the interior beauty so you often see log purlins and rafters that match the wall logs. In large buildings where heavy trusses are used the purlins are continuous members that rest.

Galvanized cee purlins 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. Metal c purlins are light in weight and perfect for simple span construction. Do all roofing projects require purlins. We do recommend it however.

Engineered purlin metal mart offers a complete line of engineered purlin material. Purlins purlins are used in roof construction to support corrugated sheet metal if it is used or to support the sheathing of roofs framed with trusses. Cee purlins are secondary steel framing members most commonly used as roof purlins wall girts and header jamb and sill for windows and doors on metal buildings. The facia frame may also supports the soffit.

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