- Where the occupancy classification is not changed, or
- Where there is a change in occupancy classification or the occupancy group designation changes.
Exception: As modified in Section 1105 for historic buildings.
- Covered mall buildings.
- Motor vehicle-related occupancies.
- Aircraft-related occupancies.
- Motion picture projection rooms.
- Stages and platforms.
- Special amusement buildings.
- Incidental use areas.
- Hazardous materials.
- Existing doors having a clear opening width of not less than 28 inches (710 mm) and a height of 78 inches (1980 mm) shall be permitted to remain in use.
- Existing stairways having a width of not less than 36 inches (915 mm) shall be permitted to remain in use.
- Existing stairways shall be permitted to remain in use if the riser height does not exceed 81/4 inches (210 mm) and the tread is not less than 9 inches (229 mm), and that variations in riser height do not exceed 1/4 inch (155 mm) in any run of stairs.
- Existing guards and handrails having a height of not less than 34 inches (865 mm) and openings not exceeding 6 inches (155 mm) shall be permitted to remain in use.
- Structural elements whose stress is not increased by more than 5 percent.
- Existing elements to remain in structures less than 3,500 square feet (325 m2) per floor and less than four stories, shall be permitted with live loads identified in Table 907.1 provided:
- The floor structure does not permit direct access by heavy equipment such as forklifts, through a loading dock or doors more than 44 inches in width, and
- Incidental storage or retail shelves shall not be permitted to exceed 6 feet 8 inches (2632 mm) in height.
|OCCUPANCY OR USE|| UNIFORM LOAD |
| CONCENTRATED |
|Corridors||Same as occupancy served|
|Dining rooms and restaurants||75|
|Stairs and exits||75||300|
Exception: Where the new occupancy with a higher importance factor is less than or equal to 10 percent of the total building floor area. The cumulative effect of the area of occupancy changes shall be considered for the purposes of this exception.
- Group M occupancies being changed to Group A, E, I-1, R-1, R-2 or R-4 occupancies for buildings less than six stories in height and in Seismic Design Category A, B or C.
- Specific detailing provisions required for a new structure are not required to be met where it can be shown that an acceptable level of performance and seismic safety is obtained for the applicable occupancy category using reduced Building Code of New York State level seismic forces as specified in Section 506.1.1.3. The rehabilitation procedures shall be approved by the code enforcement official and shall consider the regularity, overstrength, redundancy and ductility of the lateral-load-resisting system within the context of the existing detailing of the system.
- Where the area of the new occupancy with a higher hazard category is less than or equal to 10 percent of the total building floor area and the new occupancy is not classified as Occupancy Category IV. For the purposes of this exception, where a structure is occupied for two or more occupancies not included in the same occupancy category, the structure shall be assigned the classification of the highest occupancy category corresponding to the various occupancies. Where structures have two or more portions that are structurally separated, each portion shall be separately classified. Where a structurally separated portion of a structure provides required access to, required egress from, or shares life safety components with another portion having a higher occupancy category, both portions shall be assigned the higher occupancy category. The cumulative effect of the area of occupancy changes shall be considered for the purposes of this exception.
- Unreinforced masonry bearing wall buildings in Occupancy Category III when assigned to Seismic Design Category A or B shall be allowed to be strengthened to meet the requirements of Appendix Chapter A1 of this code.
Exception: Where the adjacent structure conforms to the requirements for Occupancy Category IV structures.
Where operational access is less than 10 feet (3048 mm) from an interior lot line or less than 10 feet (3048 mm) from another structure, access protection from potential falling debris shall be provided by the owner of the Occupancy Category IV structure.
- Hazardous locations.
- Commercial garages, repair, and storage.
- Aircraft hangars.
- Gasoline dispensing and service stations.
- Bulk storage plants.
- Spray application, dipping, and coating processes.
- Health care facilities.
- Places of assembly.
- Theaters, audience areas of motion picture and television studios, and similar locations.
- Motion picture and television studios and similar locations.
- Motion picture projectors.
- If the existing piping is not compatible with the chemical waste, the waste shall be neutralized prior to entering the drainage system, or the piping shall be changed to a compatible material.
- No chemical waste shall discharge to a public sewer system without the approval of the sewage authority.
TABLE 912.4 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|
|4||B, F-1, R-3, S-1|
|5 (Lowest Hazard)||F-2, S-2, U|
- Stairways shall be enclosed in compliance with the applicable provisions of Section 803.1.
- Existing stairways including handrails and guards complying with the requirements of Chapter 7 shall be permitted for continued use subject to approval of the code enforcement official.
- 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.
- Existing corridor walls constructed of wood lath and plaster in good condition or 1/2-inch-thick (12.7 mm) gypsum wallboard shall be permitted.
- Existing corridor doorways, transoms, and other corridor openings shall comply with the requirements in Sections 705.5.1, 705.5.2, and 705.5.3.
- Existing dead-end corridors shall comply with the requirements in Section 705.6.
- An existing operable window with clear opening area no less than 4 square feet (0.38 m2) and with minimum opening height and width of 18 inches (457 mm) shall be accepted as an emergency escape and rescue opening.
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.
Exception: In other than Groups H, F-1, I and S-1, in lieu of fire walls, use of fire barriers having a fire-resistance rating of not less than that specified in Table 705.4 of the Building Code of New York State, constructed in accordance with Section 706 of the Building Code of New York State, shall be permitted to meet area limitations required for the new occupancy in buildings protected throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 of the Fire Code of New York State.
Exception: Where the fire barriers are required to have a 1-hour fire-resistance rating, existing wood lath and plaster in good condition or existing 1 / 2 -inch-thick (12.7 mm) gypsum wallboard shall be permitted.
Exception: A 2-hour fire-resistance rating shall be allowed where the building does not exceed three stories in height and is classified as one of the following groups: A-2 and A-3 with an occupant load of less than 300, B, F, M, or S.
912.6.2 Exterior Wall Rating for Change of Occupancy Classification to an Equal or Lesser Hazard Category
- Where the Building Code of New York State permits openings in excess of 50 percent.
- Protected openings shall not be required in buildings of Group R occupancy that do not exceed three stories in height and that are located not less than 3 feet (914 mm) from the property line.
- Where exterior opening protectives are required, an automatic sprinkler system throughout may be substituted for opening protection.
- Exterior opening protectives are not required when the change of occupancy group is to an equal or lower hazard classification in accordance with Table 912.6
- In other than Group I occupancies, an enclosure shall not be required for openings serving only one adjacent floor and that are not connected with corridors or stairways serving other floors.
- Unenclosed existing stairways need not be enclosed in a continuous vertical shaft if each story is separated from other stories by 1-hour fire-resistance-rated construction or approved wired glass set in steel frames and all exit corridors are sprinklered. The openings between the corridor and the occupant space shall have at least one sprinkler head above the openings on the tenant side. The sprinkler system shall be permitted to be supplied from the domestic water-supply systems, provided the system is of adequate pressure, capacity, and sizing for the combined domestic and sprinkler requirements.
- Existing penetrations of stairway enclosures shall be accepted if they are protected in accordance with the Building Code of New York State.
- Existing 1-hour interior shaft enclosures shall be accepted where a higher rating is required.
- Vertical openings, other than stairways, in buildings of other than Group I occupancy and connecting less than six stories shall not be required to be enclosed if the entire building is provided with an approved automatic sprinkler system.
- At least one accessible building entrance.
- At least one accessible route from an accessible building entrance to primary function areas.
- Signage complying with Section 1110 of the Building Code of New York State.
- Accessible parking, where parking is provided.
- At least one accessible passenger loading zone, where loading zones are provided.
- At least one accessible route connecting accessible parking and accessible passenger loading zones to an accessible entrance.
- At least one accessible toilet room complying with Section 1109.2.1 of the Building Code of New York State, where toilet rooms are provided.
- Where more than four Groups R-2 or R-3 dwelling units or sleeping units are being constructed, twenty-five percent shall comply with Section 1107.2 of the Building Code of New York State.
Exception: Buildings without elevator service where the lowest story containing Group R-2 or R-3 dwelling units is not the ground floor.
Where it is technically infeasible to comply with the new construction standards for any of these requirements for a change of group or occupancy, the above items shall conform to the requirements to the maximum extent technically feasible. Changes of group or occupancy that incorporate any alterations or additions shall comply with this section and Sections 605.1, 706.1 or 1005.1 as applicable.