Which type of stairs loses tension rapidly when exposed to heat?

Folding stairs are designed with lightweight materials and often include components that can be affected significantly by exposure to heat. When subjected to high temperatures, these materials can lose their structural integrity more quickly than those used in other types of stairs. The design of folding stairs usually relies on the tension created by these materials to maintain their shape and stability. Therefore, when heat is applied, the tension can diminish rapidly, leading to potential failure of the stairs.

On the other hand, spiral, scissor, and circular stairs, while they may also be designed with various materials, typically have more robust structural elements or designs that can better withstand heat. Their construction often provides additional support and rigidity, helping them to endure higher temperature situations compared to the lightweight construction of folding stairs.