Minimum Step Riser Height
Stair riser heights the riser height shall be measured vertically between the leading edges of adjacent treads.
Minimum step riser height. Stairs landing shall have a minimum live loading of 2 5 kpa and minimum point loading of 1 1 kn applied on 100mm 100mm pad. Staircase tread run depth. Maximum 7 3 4 inch stair riser height. 4 step riser height uniformity 3 8 variation between successive step surfaces or in some codes 3 16 4 8 mm.
Handrail graspability to be either type i or ii with a minimum 1 1 2 inch clearance from a wall. Maximum stair step riser height 7 75 or in some codes 8 minimum stair step riser height. Minimum 10 inch stair tread depth with nosing or minimum 11 inches with no nosing. Treads the horizontal stair element you step on that are at least 10 inches in depth and no more than 14 inches.
The codes only state a maximum riser height of 7 3 4. Minimum 6 8 headroom height clearance for stairway. 10 to 11 inches minimum. Stair widths with a minimum of 22 inches.
Maximum 12 3 vertical height rise for a flight of stairs. But the fbc specifies ansi a117 1 09 accessible and usable buildings and facilities as a reference standard which does have 4 as a minimum riser height. Risers the vertical element connecting treads that are no less than 6 inches in height and no more than 7 5 inches.