Which type of stairs is known to lose tension rapidly when exposed to high temperatures?

Folding stairs are designed primarily for accessibility and space-saving purposes, typically made from materials that may not be as sturdy or insulated against heat as those used in more robust stair types. When exposed to high temperatures, such as those from a fire, the materials that comprise folding stairs—including metal components—can experience a significant reduction in tensile strength. This results in these stairs losing tension and structural integrity quickly, making them less reliable in fire situations.

In contrast, other types of stairs such as spiral, scissor, or circular stairs are often constructed with greater stability and can retain structural integrity longer under heat exposure, which is crucial in emergency scenarios. This characteristic of folding stairs makes them particularly hazardous in fire situations, emphasizing the importance of understanding the limitations of various stair designs.