Under development

Stair Details

* Under Development *

Risers, Treads, and Nosings

Riser Height: 4" | 100 mm min.; 7" | 180 mm max.
Tread Depth:
11" | 280 mm min.
Nosing Protrusion: 
1.5" | 38 mm max.
Nosing Radius: .5" | 13 mm max.

Responding to the movement of the human body, the sizes and relationships of stair risers and treads are regulated to make vertical motion safe and easy. Steep stairs make climbing more tiring and dangerous, while shallow stairs are awkward and inefficient for our human stride. Buildings codes have been created to control the minimum and maximum measurements of risers and treads.
Responding to the movement of the human body, the sizes and relationships of stair risers and treads are regulated to make vertical motion safe and easy. Steep stairs make climbing more tiring and dangerous, while shallow stairs are awkward and inefficient for our human stride. Buildings codes have been created to control the minimum and maximum measurements of risers and treads.
Details & Downloads
  • Riser and tread dimensions should be continuously uniform for safety; building codes limit variation to 3/8" | 10 mm
  • The underside of risers should be sloped or have a 60° angle minimum between nosings and the horizontal surface
  • Open risers are not allowed under ADA guidelines