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.

目，国各地的“平改坡”项目中，普遍采用轻钢结构坡屋，由钢柱、钢梁或钢桁架及钢檩条构成，通过浇筑混梁将新增轻钢坡屋与原有混结构连接。