What is the maximum acceptable variation in riser heights within a flight of stairs?

The maximum acceptable variation in riser heights within a flight of stairs is crucial for ensuring safety and comfort for users. A variation of 3/8 inch is recognized as the standard limit for riser height discrepancies. This small allowance helps prevent tripping hazards that might be caused by steps that are uneven in rise, which can lead to accidents, particularly for individuals who may not be paying close attention or for those with mobility challenges.

This standard is based on building codes and safety guidelines that prioritize uniformity in stair design. A variance greater than this can create substantial risks as it disrupts the natural rhythm of climbing stairs, leading to potential falls.

In summary, a variation of 3/8 inch is established as the safe threshold that complies with most building codes, ensuring stairs are both functional and safe. This standard is important for maintaining accessibility and providing a predictable experience for users.