Secondary members are composed of roof purlins, Wall grits, eave struts & roofing sheets. Roof purlins, wall grits & struts are forms of Z-purlins, C-purlins and hollow sections. Z-purlins & C-purlins are cold formed steel members having a minimum yield strength of 345 MPa with zinc coating (120/180/275 GSM). Purlins are available in various lengths and thicknesses, ensuring no wastage. Purlins can be easily mounted, resistant to corrosion, lightweight and robust.
Z- Purlins are used to support the roof sheeting / wall cladding. It is a customized product as per design. It provides better strength to weight radio and used for large span (upto 11 MTR)
JEPL Purlins are roll formed from high strength steel and galvanized with coating 120-180 GSM . It is supplied with pre punched staggered holes. The standard holes dimensions are shown in photograph.
Advantage of Purlins :
- Light in weight and higher strength
- Greater spanning capability
- Longer life due to Zinc coating
- No welding required at site
- Lower maintenance cost
- Pre punched for easy installation
Roof Purlins (Cold Formed) : Purlins shall be Z sections with 200 to 300 mm depth & thickness varying from 1.75 to 2.50 mm as per structural requirement. These purlins are fixed to the top flanges of the rafters by means of cleats moulded to the rafters and the purlin web bolted to the cleats. Purlin ends are overlapped to act as continuous beams.
