specification of gutter grating
ASTM A36,A1011,A569,Q235,S275JR,SS304,Mild steel&low carbon steel,etc.
Bearing bar pitch
15-30, 40, 60, 80, 90 mm etc. with 30, 40,60mm recommended.
cross bar pitch
any greater than 30mm is ok. with 50, 100mm recommended.
G-hot-dip galvanization(G is usually omitted)
bearing bar shape
F- plain surface (F is usually can be omitted)
I-the section is of ‘I’ type
some picture for your reference,special require and drawing be allowed