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d. The requirements for new and existing stairs shall not apply to stairs
located in industrial equipment access areas except as otherwise
provided in Division 15 of this Chapter.
Table 2: DIMENSIONAL CRITERIA FOR NEW STAIRS
Feature
Minimum Width
Maximum height of risers
Minimum height of risers
Minimum tread depth
Minimum headroom
Maximum height between landings
Dimensional Criteria
mm
in
See Table 4
180
7
100
4
280
11
2000
80
3660
144
Table 3: DIMENSIONAL CRITERIA FOR EXISTING STAIRS
Dimensional Criteria
mm
in
Feature
Minimum width clear of all
obstructions, except projections
not more than 114 mm (4½ in) at or
below handrail height on each side
Maximum height of risers
Minimum tread depth
Minimum headroom
Maximum height between landings
915
205
230
2000
3660
36
8
9
80
144
2. Minimum New Stair Width
a. Where the total occupant load of all storeys served by the stair is
fewer than 50, the minimum width clear of all obstructions, except
projections not more than one hundred fourteen millimeters (114
mm) at or below handrail height on each side, shall be nine
hundred fifteen millimeters (915 mm).
b. Where stairs serve occupant loads exceeding that permitted by
para B 2(a) of this Section, the minimum width clear of all
obstructions, except projections not more than one hundred
fourteen millimeters (114 mm) at or below handrail height on each
side, shall be in accordance with Table 4 and the requirements of
para B 2(c), (d), and (e) of this Section.
Table 4: NEW STAIR WIDTH
Total Cumulative Occupant
Load Assigned to the Stair
<2000 persons
>2000 persons
64
Width
mm
in
1120
44
1420
56