The Round Rib profile is used for roofing as well as decorative cladding. It is 987.5mm wide and has round ribs of depth 28.5mm with pitches 177.5cm.Between two major ribs, there are three minor ribs. The shape of the profile makes is structurally storng and architecturally attractive .The thickness of sheet varies from 0.30 to .60mm and is made of pre-coated galvanised sheet , galvalumes( Zinc aluminum coated sheet ) or bare/precoated aluminium.