Stair details refer to the standard requirements governing each of the various components of a flight of stairs. Regulated by building codes, especially in conditions serving emergency public egress, stair details specify the height and depth of risers and treads, the widths of stairs for differing occupancy loads, the placement and dimensions of handrails and guardrails, and typical construction methods for fabricating a flight of stairs.
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.