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Hazard categories in regard to life safety and means of egress shall be in accordance with Table 1011.5.
TABLE 1011.5
MEANS OF EGRESS HAZARD CATEGORIES
RELATIVE HAZARD OCCUPANCY CLASSIFICATIONS
1 (Highest Hazard) H
2 I-2; I-3; I-4
3 A; E; I-1; M; R-1; R-2; R-4, Condition 2
4 B; F-1; R-3; R-4, Condition 1; S-1
5 (Lowest Hazard) F-2; S-2; U
1011.5.1 Means of Egress for Change to a Higher-Hazard Category
Where a change of occupancy classification is made to a higher-hazard category (lower number) as shown in Table 1011.5, the means of egress shall comply with the requirements of Chapter 10 of the International Building Code.
Exceptions:
  1. Stairways shall be enclosed in compliance with the applicable provisions of Section 903.1.
  2. Existing stairways including handrails and guards complying with the requirements of Chapter 9 shall be permitted for continued use subject to approval of the code official.
  3. Any stairway replacing an existing stairway within a space where the pitch or slope cannot be reduced because of existing construction shall not be required to comply with the maximum riser height and minimum tread depth requirements.
  4. Existing corridor walls constructed on both sides of wood lath and plaster in good condition or 1/2-inch-thick (12.7 mm) gypsum wallboard shall be permitted. Such walls shall either terminate at the underside of a ceiling of equivalent construction or extend to the underside of the floor or roof next above.
  5. Existing corridor doorways, transoms and other corridor openings shall comply with the requirements in Sections 804.6.1, 804.6.2 and 804.6.3.
  6. Existing dead-end corridors shall comply with the requirements in Section 804.7.
  7. An operable window complying with Section 1011.5.6 shall be accepted as an emergency escape and rescue opening.
1011.5.2 Means of Egress for Change of Use to an Equal or Lower-Hazard Category
Where a change of occupancy classification is made to an equal or lesser-hazard category (higher number) as shown in Table 1011.5, existing elements of the means of egress shall comply with the requirements of Section 905 for the new occupancy classification. Newly constructed or configured means of egress shall comply with the requirements of Chapter 10 of the International Building Code.
Exception: Any stairway replacing an existing stairway within a space where the pitch or slope cannot be reduced because of existing construction shall not be required to comply with the maximum riser height and minimum tread depth requirements.
1011.5.3 Egress Capacity
Egress capacity shall meet or exceed the occupant load as specified in the International Building Code for the new occupancy.
1011.5.4 Handrails
Existing stairways shall comply with the handrail requirements of Section 804.10 in the area of the change of occupancy classification.
1011.5.5 Guards
Existing guards shall comply with the requirements in Section 804.12 in the area of the change of occupancy classification.
1011.5.6 Existing Emergency Escape and Rescue Openings
Where a change of occupancy would require an emergency escape and rescue opening in accordance with Section 1031 of the International Building Code, operable windows serving as the emergency escape and rescue opening shall comply with the following:
  1. An existing operable window shall provide a minimum net clear opening of 4 square feet (0.38 m2) with a minimum net clear opening height of 22 inches (559 mm) and a minimum net clear opening width of 20 inches (508 mm).
  2. A replacement window where such window complies with both of the following:
    2.1. The replacement window meets the size requirements in Item 1.
    2.2. The replacement window is the manufacturer's largest standard size window that will fit within the existing frame or existing rough opening. The replacement window shall be permitted to be of the same operating style as the existing window or a style that provides for an equal or greater window opening area than the existing window.

Related Code Sections

1011.4 Change of Occupancy, Means of Egress, General
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