How do you calculate the slope of the staircase?

To calculate the slope of a staircase, the most accurate method is to measure from the bottom of the finished ground to the top of the finished landing. This approach provides a true representation of the vertical rise over the horizontal run, essential for ensuring that the staircase is both functional and safe. The finished ground represents the actual surface that users will encounter, while the finished landing is the final elevation of the staircase.

Using this method allows for accounting for any variations in the construction or finished surfaces, leading to a more precise calculation of the slope. The slope, often expressed as a ratio or degree, is critical in determining the angle of the staircase, ensuring it meets building codes and user comfort. Other options that might focus on the rough ground or specific steps may not provide a complete understanding of the overall staircase slope, leading to inaccuracies in measurement.