Stairs shall be installed at an angle between what degrees from horizontal?

The correct answer identifies that stairs should be installed at an angle between 30 and 50 degrees from the horizontal. This angle range is essential for maintaining safety and accessibility in buildings. Stairs at angles less than 30 degrees may be difficult to ascend and descend, potentially leading to tripping hazards, while angles greater than 50 degrees can make stairs dangerously steep and difficult to use.

Building codes and safety standards often dictate these angle specifications to ensure that stairways are both functional and safe for users. An angle within this range provides a balance between slope and ease of movement, allowing for proper footing and stability as individuals use the stairs. This is particularly important in fire safety and egress situations, where rapid and safe evacuation can be critical.

Adhering to these standards also contributes to compliance with regulations that aim to prevent accidents and injuries related to stair use in various occupancy types.