使用钢结构对原有房屋建筑进行加层改造是增大使用面积的快捷有效的方法。许多工程实践证明，采用加层改造方案比拆旧新建方案具有工期短、造价低、改善使用功能等特点。屋顶加层制作的工艺材料及方式有很多其中以钢结构施工快捷，安全稳定，以及很高的价值，被得到广泛采纳。钢材与混凝土及木材相比，其屈服点和抗拉伸强度较大，在承载力相同的条件下，钢结构构件截面小，重量轻，便于运输和安装。这些都有利于室内制作钢结构，同时也会大大增加室内空间。同时钢结构，制造简便，施工周期短，无须保养，后期装饰连接简便。这些优点都有利于楼房结构内的改造与加固。
It is a quick and effective method to increase the using area to use steel structure to add stories to the original building. Many engineering practices have proved that, compared with the old one, the scheme of adding storey has the characteristics of shorter construction period, lower cost and better use function. There are many craft materials and ways of roof adding layer production, among which steel structure construction is fast, safe and stable, as well as high value, which is widely adopted. Compared with concrete and wood, steel has higher yield point and tensile strength. Under the same bearing capacity, steel structure components have small cross-section and light weight, which is convenient for transportation and installation. These are conducive to the indoor production of steel structures, but also greatly increase the indoor space. At the same time, the steel structure has the advantages of simple manufacture, short construction period, no maintenance, and simple decoration and connection in the later stage. These advantages are conducive to the reconstruction and reinforcement of the building structure.
屋顶加层钢结构因涉及到安全问题，根据使用的要求，每平荷载公斤不等，不同宽度设计钢材型号不一样，必须有专业的人员施工，专业的设计及技术人员。值得注意的是钢结构自身是与房体直接接触，这就必须考虑原有房体的承重，及结构自身承载对原房体的冲击。随意的破坏墙体结构，去完成阁楼的搭建，会使整个结构存在隐患，屋顶加层在设计上的要求，尽可能在满足承重的情况下，把结构的自重降到最低，这样有利于两个结构的使用及安全。
Due to the safety problems involved in the roof adding steel structure, according to the requirements of use, the average load of each flat load is not equal to kg, and the design steel models of different widths are different. Therefore, there must be professional construction personnel, professional design and technical personnel. It is worth noting that the steel structure itself is in direct contact with the house, so the bearing capacity of the original building and the impact of the bearing capacity of the structure on the original building must be considered. Random damage to the wall structure, to complete the attic building, there will be hidden dangers in the whole structure, roof adding layer in the design requirements, as far as possible to meet the load-bearing conditions, reduce the self weight of the structure to the minimum, which is conducive to the use and safety of the two structures.