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Secondary structural framing shall include the purlins, girts eave struts, wind bracing, flange bracing, base angles, clips and other miscellaneous structural parts. Roof and wall claddings shall confirm to the physical specifications of ASTM Grade D ( or equivalent) and having a minimum yield strength of 50,000 PSI( 345Mpa). AS1397,G550, AZ150 (550 MPA minimum yield stress ,150 gm/m2 mi. coating mass or COLORBOND Pre painted steel confirming to AS 2728 class 3-4. All other miscellaneous secondary members shall have a minimum yield strength of 36,000 PSI (250Mpa) or equivalent grade.


  • Type: Pre Punch, Post cutting type & complete automatic Rolled foaming.
  • Purlin Sizes: 150 to 300 mm
  • Material: GI or MS
  • Thickness: 1.6 mm to 3.0 mm Yield strength 345 MPa (50,000 psi) and will conform to the physical specifi cations of ASTM 572 (Grade 50) or ASTM A653 (Grade 50) or equivalent.