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”中，普遍采用轻钢结屋，由钢柱、钢梁或钢桁架及钢成，通过浇筑混凝土卧梁将新增轻钢屋与原有混凝土结连接。