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7.2.2.2.1.1
Stairs shall meet the following criteria:
  1. New stairs shall be in accordance with Table 7.2.2.2.1.1(a) and 7.2.2.2.1.2.
  2. *Existing stairs shall be permitted to remain in use, provided that they meet the requirements for existing stairs shown in Table 7.2.2.2.1.1(b).
  3. Approved existing stairs shall be permitted to be rebuilt in accordance with the following:
    1. Dimensional criteria of Table 7.2.2.2.1.1(b)
    2. Other stair requirements of 7.2.2
  4. The requirements for new and existing stairs shall not apply to stairs located in industrial equipment access areas where otherwise provided in 40.2.5.3.
Table 7.2.2.2.1.1(a) New Stairs
Feature Dimensional Criteria
ft/in. mm
Minimum width See 7.2.2.2.1.2.
Maximum height of risers 7 in. 180
Minimum height of risers 4 in. 100
Minimum tread depth 11 in. 280
Minimum headroom 6 ft 8 in. 2030
Maximum height between landings 12 ft 3660
Landing See 7.2.1.3, 7.2.1.4.3.1, and 7.2.2.3.2.
Table 7.2.2.2.1.1(b) Existing Stairs
Feature Dimensional Criteria
ft/in. mm
Minimum width clear of all obstructions, except projections not more than 41/2 in. (114 mm) at or below handrail height on each side 36 in. 915
Maximum height of risers 8 in. 205
Minimum tread depth 9 in. 230
Minimum headroom 6 ft 8 in. 2030
Maximum height between landings 12 ft 3660
Landing See 7.2.1.3 and 7.2.1.4.3.1.
7.2.2.2.1.2* Minimum New Stair Width
(See also 7.3.3.)
(A)
Where the total occupant load of all stories served by the stair is fewer than 50, the minimum width clear of all obstructions, except projections not more than 41/2 in. (114 mm) at or below handrail height on each side, shall be 36 in. (915 mm).
(B)*
Where stairs serve occupant loads exceeding that permitted by 7.2.2.2.1.2(A), the minimum width clear of all obstructions, except projections not more than 41/2 in. (114 mm) at or below handrail height on each side, shall be in accordance with Table 7.2.2.2.1.2(B) and the requirements of 7.2.2.2.1.2(C), 7.2.2.2.1.2(D), 7.2.2.2.1.2(E), and 7.2.2.2.1.2(F).
Table 7.2.2.2.1.2(B) New Stair Width
Total Cumulative Occupant Load Assigned to the Stair Width
in. mm
<2000 persons 44 1120
≥2000 persons 56 1420
(C)
The total cumulative occupant load assigned to a particular stair shall be that stair's prorated share of the total occupant load, as stipulated in 7.2.2.2.1.2(D) and 7.2.2.2.1.2(E), calculated in proportion to the stair width.
(D)
For downward egress travel, stair width shall be based on the total number of occupants from stories above the level where the width is measured.
(E)
For upward egress travel, stair width shall be based on the total number of occupants from stories below the level where the width is measured.
(F)
The clear width of door openings discharging from stairways required to be a minimum of 56 in. (1420 mm) wide in accordance with 7.2.2.2.1.2(B) shall be in accordance with 7.2.1.2.3.2(9).

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7.2.2.2.1 Means of Egress, Standard Stairs
Stairs shall meet the following criteria: New stairs shall be in accordance with Table 7.2.2.2.1.1(a) and 7.2.2.2.1.2. *Existing stairs shall ...
(D) Means of Egress,
For downward egress travel, stair width shall be based on the total number of occupants from stories above the level where the width is measured ...
(E) Means of Egress,
For upward egress travel, stair width shall be based on the total number of occupants from stories below the level where the width is measured ...
(F) Means of Egress,
The clear width of door openings discharging from stairways required to be a minimum of 56 in. (1420 mm) wide in accordance with 7.2.2.2.1.2(B) shall ...
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For standard stairs, at least one handrail shall be installed at a right angle to the leading edge of the stair treads ...