Ubc standards for stairs cover many aspects of stair and handrail design and installation including those required by the americans with disabilities act of 1990 and subsequent revisions of the ubc.
Building open riser stairs.
Use different floor finishes to lead to the staircase.
Minimum 10 inch stair tread depth with nosing or minimum 11 inches with no nosing.
Clamp the stair gauges to the carpenter s square.
Draw attention to a staircase by using higher levels of local lighting.
Exceptions for private steps and stairways serving an occupant load of less than 10 and stairways to unoccupied roofs may have a maximum rise of 8 inches and a minimum run of 9 inches.
The building codes that california uses are based on those found in the uniform building code or ubc instituted in 1927.
Maximum 7 3 4 inch stair riser height.
Locate staircases in a prominent position and visible from the building entry and lift waiting areas.
Use the narrow part of the square for clamping the riser gauge and the wider part for the 10 1 4 in.
The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3 8 inch.
Stair treads shall be of uniform size and shape except the largest tread run within any flight of stairs shall not exceed the smallest by more than 3 8 inch.
Maximum 12 3 vertical height rise for a flight of stairs.
Handrail graspability to be either type i or ii with a minimum 1 1 2 inch clearance from a wall.
Lay out the stairs by drawing on the outside of the square sliding the square along until it meets the last mark to learn how to build steps.
Handrail height to be placed a minimum 34 inches to 38 inches.