When designing a staircase with landings, it's easy to think of each flight of stairs as a separate entity. However, building codes often require consistent riser heights throughout the entire staircase, even when landings interrupt the flow.
Understanding the Code's Perspective
Building codes prioritize safety and accessibility. Consistent riser heights ensure a predictable and rhythmic climb, reducing the risk of trips and falls. This principle applies even when landings divide the staircase into distinct flights.
Why Consistent Risers Matter
Muscle Memory: As we climb stairs, our bodies develop a subconscious expectation of the riser height. Inconsistent risers disrupt this expectation, increasing the likelihood of missteps.
Visual Perception: Even a slight variation in riser height can create a visual illusion, making it difficult to accurately judge the step height.
Universal Design: Consistent risers contribute to accessibility for people with mobility impairments or visual limitations, who rely on a predictable stair pattern.
Example Scenario
Let's take your example of a staircase with two flights:
Flight 1: 6 steps leading to a landing (separte flight of stairs connecting to landing)
Flight 2: 6 steps leading to the second floor (separte flight of stairs connecting to landing)
Each flight of stairs needs to have the same riser heights.
Conclusion
While landings provide a visual and functional break in a staircase, building codes often require consistent riser heights throughout all flights. This ensures a safe, predictable, and accessible climb for all users.
