1. Material formation of roof slope
The inclination of roof is made up by slope information when the length of slope is not long. Using light materials to reduce the roof load, such as Cement cinder and lime slag. The thickness of the slope is no less than 20mm, the inclination is better about 2%.
2. Structure formation of roof slope
It means roof structure its self carry the drainage slope, the slope of flat roof structure better be 30%.
Roof panel should be horizontal placed and ceiling should be smooth and flat. But materials and labor cost higher. It also has shortcomings, such as the space is not regular. Above two are widely applied in engineering practice.