Roof Framing Plan Roofing C Purlins

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.

Roof framing plan roofing c purlins.

Purlins traditionally support the roof deck cladding sheeting and are in turn supported by the principal rafters steel beams etc. In large buildings where heavy trusses are used the purlins are continuous members that rest. Engineered purlin metal mart offers a complete line of engineered purlin material. We do recommend it however.

C section purlins or cee section purlins are designed to form the walls and floor joists of a building shell structure making them also ideal for supporting beams needed for mezzanine flooring. 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. Do all roofing projects require purlins. Our frame is welded up of 1 x 1 angle bar and 1 flat bar.

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. 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. A common arrangement is a rafter and purlin system which combines purlins and rafters. 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.

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. 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. The shape of cee purlins does not allow end lapping they are butted together.

Welded together they can be used as columns braces and ties. Roof purlin needs no introduction to anyone in the construction industry. Metal c purlins are light in weight and perfect for simple span construction. 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 steel purlins are in turn supported by rafters or walls. This frame supports and is hidden by a metal facia board. During maintenance services and repairs and environmental loads e g. In their design life purlins are subjected to dead load e g self weight of sheeting materials and accessories live load e g.

In small roofs purlins are inserted between the rafters and nailed through the rafters. The facia frame may also supports the soffit. A traditional purlin strictly by definition is a horizontal structural member in a roof.