In stair design, the total run is best described as the sum of the

In stair design, the total run is best described as the sum of the

• A. tread width
• B. risers
• C. tread run
• D. risers and treads

Answer: (C)

The total run is the horizontal distance of the stair flight, found by adding up the horizontal portions of each step—the tread runs. Each tread has a depth, or run, that contributes to how far you travel horizontally as you go up. Therefore the total run is the sum of those tread runs. The other options don’t fit because tread width is the side-to-side dimension of the tread, not the length along the flight; risers are the vertical components, which relate to total rise; and combining risers with treads mixes vertical and horizontal measurements, which isn’t what the run represents.

The total run is the horizontal distance of the stair flight, found by adding up the horizontal portions of each step—the tread runs. Each tread has a depth, or run, that contributes to how far you travel horizontally as you go up. Therefore the total run is the sum of those tread runs.

The other options don’t fit because tread width is the side-to-side dimension of the tread, not the length along the flight; risers are the vertical components, which relate to total rise; and combining risers with treads mixes vertical and horizontal measurements, which isn’t what the run represents.