There are two types of spiral stairs: spiral stairs that rotate 360 ° around the center to reach a floor height, and spiral spiral spiral stairs that rotate less than 360 °. Rotating stairs are mostly subjected to central forces, and structural instability or excessive load-bearing can easily cause shaking. Therefore, in the design process, issues related to the structural beam load, reinforcement, and renovation of stairs should be addressed by a professional staircase specialist who will provide a load calculation book and professional drawings for the structure. The construction will be the responsibility of an independent manufacturer.