Rib type Clip-On Roofing System is provided with anti-capillary side laps to offer safety for a slope as low as 2 degree. The Roofing System is designed with slim ribs that provide long term durability. The Roofing System can be used for roof slope as low as 1 degree when the purlin and the roof plane are perfectly aligned. Rib type Clip-On Roofing System is offered in high tensile steel construction and in a height range of 41 mm.