Advantage
1. Light weight ability, security and stability, less impact on the original building, suitable for reconstruction construction;
2. Good bearing capacity of channel keel ;
3. Convenient construction and decoration
4. Maintenance period of staircase without cement;
5. Steel roof truss with steel chords and steel, straining beam, and force is reasonable, safety and rationality;
Natural environmental protection, high quality, texture nature, and long service life. Simple and generous style has strong practicability. The taste is not very big and quality is good.