Welded together they can be used as columns braces and ties.
Roof framing plan roofing c purlins.
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.
In large buildings where heavy trusses are used the purlins are continuous members that rest.
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.
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.
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.
Purlins are 2 by 4 feet and are installed much like metal roofing.
Engineered purlin metal mart offers a complete line of engineered purlin material.
The cos of the purlin spacing is because the load on the purlins is vertical and the purlin spacing is with the run of the roof.
The shape of cee purlins does not allow end lapping they are butted together.
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.
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.
They give added support to the roof and also provide a nailing surface for the end panels and drip edge.
Do all roofing projects require purlins.
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.
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.
We do recommend it however.
In structural steel or aluminum construction purlins usually w shapes or channels transfer roof loads to the major structural elements supporting the roof.
A common arrangement is a rafter and purlin system which combines purlins and rafters.
A traditional purlin strictly by definition is a horizontal structural member in a roof.
Purlins are installed horizontally under metal roofs.
In small roofs purlins are inserted between the rafters and nailed through the rafters.
The type and spacing of purlins is a design consideration which depends upon the incident roof loads as well as the limiting lengths of sheeting to be used.
Dead load will be the actual weight of the roof steel and the roof purlins.
The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.
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.
