Nowadays, slop roof consists of steel column and beam or steel truss and purling, and connected with existed building by concrete beam cast in place, is being used commonly in this project.

前，在全国各地的“平改坡”，普遍采用轻结构坡屋，由柱、梁或桁架及构成，通过浇筑混凝土卧梁将新增轻坡屋与原有混凝土结构连接。