supply of colour coated sheets of facttory , supply trapezoidal/corrugated sheeting system in galvalume in colour coating steel having covered width of 1000 mm ( total width 1060mm ) , 35 mm crest at a pitch of 250 mm stiffened with 8 mm deep intermittent corrugation sheet be made from base metal having 0 . 50 mm thickness in steel of grade 345 as per astm a 792 m coated with alloy of al & zn to grade az minimum alloy mass 150 gm total both side with colour coating having complete dip tank pre-treatment process with chromat conversion ( cr +3 ) as main pre-treatment followed by pu primer of min . 5 micron dft on each surface , finished with special polyester paint to grade 20 of min . 20 micron dft on exposed surface & 5 micron in grey shad on unexposed surface . note:- sheets shall be supported with coil manufacturer test certificates for strength & coating thickness . , supply of ridge of same material as item no . 1 having total width of 1060mm crimped curve type/pressed with same profile . , supply of 2 mm poly carbonates sheets/frp of matching profile ( for lightening purpose ) .