Maximum 7 3 4 inch stair riser height.
Stair handrail width.
This space is shown with the green arrow in our photograph below.
Intermediate handrails shall be spaced approximately equally across the entire width of the stairway.
For stairs serving a single user typically private residential a minimum of 36 91 cm is required.
In general public spaces a minimum of 44 112 cm must be met providing ample space for one person and allowing the tight.
For example the minimum hand clearance between the railing and the wall that it is mounted on is 1 1 2 inches.
Stair widths are based on the use and occupancy loads of adjacent spaces and must be serviced with handrails on one or both sides depending on the stair width.
On ramps the clear width between handrails shall be 36 inches 914 mm minimum.
The top rail must be at least 42 inches in height 1910 29 f 1 ii b and the handrail must be 30 to 38 inches in height 1910 29 f 1 i as measured at the leading edge of the stair tread to the top surface of the rail.
Minimum 6 8 headroom height clearance for stairway.
Yet if the railing is pushed out too far there is the risk of violating another section of code that provides for 27 inches of walking width between the two railings of a double railing staircase.
Maximum 12 3 vertical height rise for a flight of stairs.
If the stairway serves a floor with an occupant load of less than 50 the minimum clear width is reduced to 36.
Private stairways 30 inches 762 or less in height may.
The same height rules apply to stairs and the inspector measures the handrail height from nose of the stair tread.
These calculations give you the required combined width of all exit stairs serving that floor.
The handrail itself should be easy to grip with a minimum diameter of 1 1 4.
For stair rail systems installed on or after january 17 2017 the top rail and handrail must be separate.
This allows taking into account stair stringer trim such as shown in our photographs.
Maximum 4 1 2 inch handrail projection into stairway width on either side.
However the minimum clear width between handrails is 44.
Maximum stairway width permitting a handrail on just one side.
Ibc 1012 7 clear width between handrails on ramps note that this is a minimum not a maximum width.
Required stair width in turn depends on the number of occupants expected to exit the building.