Girts and purlins are components of the secondary frame of a metal building. A girt is a horizontal structural member in a framed wall that provides lateral support to the wall panel to resist wind loads. Purlins perform the same service for the roof panels.
These secondary frame members are used in commercial, residential and industrial steel buildings. Another secondary frame member, the eave strut, is also known as an eave girt or eave purlin. The eave strut is the last girt at the top of the wall or the first purlin at the connection between the roof and the wall.
Our range of Purlins And Girts are manufactured using high grade material that assures its long service life & durability. These can be customized as per the specifications detailed by the clients.
- Z & C PURLINS :
We are introducing a comprehensive range of Z & C Purlins. These purlins are widely useful in various construction industries and buildings. These is offered in different specifications to fulfill the specific needs of the clients.
Both girts and purlins are available in two shapes: Z- purlins or girts and C-purlins or girts. Each appears like the letter of the alphabet after which it is named when looked at from its end.
Girts work in conjunction with columns and wall panels to support the vertical load and improve strength and stability.
They also attach and support the wall cladding.
Purlins provide additional roof support, creating a horizontal diaphragm that supports the weight of the roof and deck.
They run parallel to the building eave and are supported by rafters or walls.
Purlins add rigidity to the roof and mid-span support to allow longer spans for a wider building.
The advantage to lapping is the dual thickness of material placed over the interior supports where the bending moment and shear are most crucial. Lapping is done by rotating one Z-purlin 180 degrees and fitting it to another.
Lap length is the distance between the bolt-hole centers and the end of the laps and is expressed as a percentage of the span. The sections are bolted at the outer holes closest to the sheeting and the inner flange at both ends of the lap.
Z-sections of the same size but different thicknesses can be combined for a lower-cost span configuration.
Lapping increases load capacity and rigidity.
STABILIZING PURLINS AND GIRTS
Purlins and girts have two types of lateral instability - deflection and rotation. Both can be reduced by various techniques including bridging and attaching sheeting with screw fasteners to provide a lateral brace to the flange to which it is attached.
Bridging can prevent lateral deflection of the free flange and rotation of the section. Bridging elements include ridge bridging, bridging struts, girt hangers, fascia bridging or a girt foot.
SPACING AND SPANS
Purlin and girt spacing are dependent on the member and roof sheeting capacity. On large or medium sized buildings you can reduce costs by reducing the purlin or girt spacing at the building’s edges and ends to provide stability for higher wind pressures. Additional intermediate runs of purlins can be positioned around the areas of the highest load.
GUTTERS & DOWNPIPES
We are instrumental in providing a wide range of gutters and downpipes that are fabricated by using superior quality materials. These gutters & downpipes are highly acclaimed for corrosion resistance, low maintenance, light weight, easy installation and optimum performance.
We manufacture, install and repair gutter downpipes in standard and non-standard shapes or sizes according to your unique specifications, to all existing structures and buildings. Gutter downpipes come in various shapes namely round, rectangular fluted and square.