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  • CHAPTER9
    ALTERATIONS—LEVEL 3

    SECTION901
    GENERAL

    901.1 Scope.

    Level 3 alterations as described in Section 505 shall comply with the requirements of this chapter.

    901.2 Compliance.

    In addition to the provisions of this chapter, work shall comply with all of the requirements of Chapters 7 and 8. The requirements of Sections 803, 804 and 805 shall apply within all work areas whether or not they include exits and corridors shared by more than one tenant and regardless of the occupant load.

    Exception: Buildings in which the reconfiguration of space affecting exits or shared egress access is exclusively the result of compliance with the accessibility requirements of Section 705.2 shall not be required to comply with this chapter.

    SECTION902
    SPECIAL USE AND OCCUPANCY

    902.1 High-rise buildings.

    Any building having occupied floors more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access shall comply with the requirements of Sections 902.1.1 and 902.1.2.

    902.1.1 Recirculating air or exhaust systems.

    When a floor is served by a recirculating air or exhaust system with a capacity greater than 15,000 cubic feet per minute (701 m3/s), that system shall be equipped with approved smoke and heat detection devices installed in accordance with the International Mechanical Code.

    902.1.2 Elevators.

    Where there is an elevator or elevators for public use, at least one elevator serving the work area shall comply with this section. Existing elevators with a travel distance of 25 feet (7620 mm) or more above or below the main floor or other level of a building and intended to serve the needs of emergency personnel for fire-fighting or rescue purposes shall be provided with emergency operation in accordance with ASME A17.3. New elevators shall be provided with Phase I emergency recall operation and Phase II emergency in-car operation in accordance with ASME A17.1/CSAB44.1.

    902.2 Boiler and furnace equipment rooms.

    Boiler and furnace equipment rooms adjacent to or within Groups I-1, I-2, I-4, R-1, R-2 and R-4 occupancies shall be enclosed by 1-hour fire-resistance-rated construction.

    Exceptions:

    1. 1.Steam boiler equipment operating at pressures of 15 pounds per square inch gauge (psig) (103.4 KPa) or less is not required to be enclosed.

    2. 2.Hot water boilers operating at pressures of 170 psig (1171 KPa) or less are not required to be enclosed.

    3. 3.Furnace and boiler equipment with 400,000 British thermal units (Btu) (4.22 × 108 J) per hour input rating or less is not required to be enclosed.

    4. 4.Furnace rooms protected with an automatic sprinkler system are not required to be enclosed.

    SECTION903
    BUILDING ELEMENTS AND MATERIALS

    903.1 Existing shafts and vertical openings.

    Existing stairways that are part of the means of egress shall be enclosed in accordance with Section 803.2.1 from the highest work area floor to, and including, the level of exit discharge and all floors below.

    903.2 Fire partitions in Group R-3.

    Fire separation in Group R-3 occupancies shall be in accordance with Section 903.2.1.

    903.2.1 Separation required.

    Where the work area is in any attached dwelling unit in Group R-3 or any multiple single-family dwelling (townhouse), walls separating the dwelling units that are not continuous from the foundation to the underside of the roof sheathing shall be constructed to provide a continuous fire separation using construction materials consistent with the existing wall or complying with the requirements for new structures. All work shall be performed on the side of the dwelling unit wall that is part of the work area.

    Exception: Where alterations or repairs do not result in the removal of wall or ceiling finishes exposing the structure, walls are not required to be continuous through concealed floor spaces.

    903.3 Interior finish.

    Interior finish in exits serving the work area shall comply with Section 803.4 between the highest floor on which there is a work area to the floor of exit discharge.

    SECTION904
    FIRE PROTECTION

    904.1 Automatic sprinkler systems.

    An automatic sprinkler system shall be provided in a work area where required by Section 804.2 or this section.

    904.1.1 High-rise buildings.

    An automatic sprinkler system shall be provided in work areas where the high-rise building has a sufficient municipal water supply for the design and installation of an automatic sprinkler system at the site.

    904.1.2 Rubbish and linen chutes.

    Rubbish and linen chutes located in the work area shall be provided with automatic sprinkler system protection or an approved automatic fire-extinguishing system where protection of the rubbish and linen chute would be required under the provisions of the International Building Code for new construction.

    904.1.3 Upholstered furniture or mattresses.

    Work areas shall be provided with an automatic sprinkler system in accordance with the International Building Code where any of the following conditions exist:

    1. 1.A Group F-1 occupancy used for the manufacture of upholstered furniture or mattresses exceeds 2,500 square feet (232 m2).

    2. 2.A Group M occupancy used for the display and sale of upholstered furniture or mattresses exceeds 5,000 square feet (464 m2).

    3. 3.A Group S-1 occupancy used for the storage of upholstered furniture or mattresses exceeds 2,500 square feet (232 m2).

    904.2 Fire alarm and detection systems.

    Fire alarm and detection shall be provided in accordance with Section 907 of the International Building Code as required for new construction.

    904.2.1 Manual fire alarm systems.

    Where required by the International Building Code, a manual fire alarm system shall be provided throughout the work area. Alarm notification appliances shall be provided on such floors and shall be automatically activated as required by the International Building Code.

    Exceptions:

    1. 1.Alarm-initiating and notification appliances shall not be required to be installed in tenant spaces outside of the work area.

    2. 2.Visual alarm notification appliances are not required, except where an existing alarm system is upgraded or replaced or where a new fire alarm system is installed.

    904.2.2 Automatic fire detection.

    Where required by the International Building Code for new buildings, automatic fire detection systems shall be provided throughout the work area.

    SECTION905
    MEANS OF EGRESS

    905.1 General.

    The means of egress shall comply with the requirements of Section 805 except as specifically required in Sections 905.2 and 905.3.

    905.2 Means-of-egress lighting.

    Means of egress from the highest work area floor to the floor of exit discharge shall be provided with artificial lighting within the exit enclosure in accordance with the requirements of the International Building Code.

    905.3 Exit signs.

    Means of egress from the highest work area floor to the floor of exit discharge shall be provided with exit signs in accordance with the requirements of the International Building Code.

    SECTION906
    ACCESSIBILITY

    906.1 General.

    A building, facility or element that is altered shall comply with this section and Sections 705 and 806.

    906.2 Type B dwelling or sleeping units.

    Where four or more Group I-1, I-2, R-1, R-2, R-3 or R-4 dwelling or sleeping units are being altered, the requirements of Section 1107 of the International Building Code for Type B units and Chapter 9 of the International Building Code for visible alarms apply only to the quantity of the spaces being altered.

    Exception: Group I-1, I-2, R-2, R-3 and R-4 dwelling or sleeping units where the first certificate of occupancy was issued before March 15, 1991 are not required to provide Type B dwelling or sleeping units.

    SECTION907
    STRUCTURAL

    [BS]907.1 General.

    Where buildings are undergoing Level 3 alterations including structural alterations, the provisions of this section shall apply.

    [BS]907.2 New structural elements.

    New structural elements shall comply with Section 807.2.

    [BS]907.3 Existing structural elements carrying gravity loads.

    Existing structural elements carrying gravity loads shall comply with Section 807.4.

    [BS]907.4 Existing structural elements resisting lateral loads.

    All existing elements of the lateral force-resisting system shall comply with this section.

    Exceptions:

    1. 1.Buildings of Group R occupancy with no more than five dwelling or sleeping units used solely for residential purposes that are altered based on the conventional light-frame construction methods of the International Building Code or in compliance with the provisions of the International Residential Code.

    2. 2.Where such alterations involve only the lowest story of a building and the change of occupancy provisions of Chapter 10 do not apply, only the lateral force-resisting components in and below that story need comply with this section.

    [BS]907.4.1 Evaluation and analysis.

    An engineering evaluation and analysis that establishes the structural adequacy of the altered structure shall be prepared by a registered design professional and submitted to the code official.

    [BS]907.4.2 Substantial structural alteration.

    Where more than 30 percent of the total floor and roof areas of the building or structure have been or are proposed to be involved in structural alteration within a 5-year period, the evaluation and analysis shall demonstrate that the lateral load-resisting system of the altered building or structure complies with the International Building Code for wind loading and with reduced International Building Code-level seismic forces in accordance with Section 301.1.4.2. The areas to be counted toward the 30 percent shall be those areas tributary to the vertical load-carrying components, such as joists, beams, columns, walls and other structural components that have been or will be removed, added or altered, as well as areas such as mezzanines, penthouses, roof structures and in-filled courts and shafts.

    [BS]907.4.3 Seismic Design Category F.

    Where the building is assigned to Seismic Design Category F, the evaluation and analysis shall demonstrate that the lateral load-resisting system of the altered building or structure complies with reduced International Building Code-level seismic forces in accordance with Section 301.1.4.2 and with the wind provisions applicable to a limited structural alteration.

    [BS]907.4.4 Limited structural alteration.

    Where the work does not involve a substantial structural alteration and the building is not assigned to Seismic Design Category F, the existing elements of the lateral load-resisting system shall comply with Section 807.5.

    [BS]907.4.5 Wall anchors for concrete and masonry buildings.

    For any building assigned to Seismic Design Category D, E or F with a structural system consisting of concrete or reinforced masonry walls with a flexible roof diaphragm and any building assigned to Seismic Design Category C, D, E or F with a structural system consisting of unreinforced masonry walls with any type of roof diaphragm, the alteration work shall include installation of wall anchors at the roof line to resist the reduced International Building Code-level seismic forces in accordance with Section 301.1.4.2, unless an evaluation demonstrates compliance of existing wall anchorage.

    [BS]907.4.6 Bracing for unreinforced masonry parapets.

    Parapets constructed of unreinforced masonry in buildings assigned to Seismic Design Category C, D, E or F shall have bracing installed as needed to resist the reduced International Building Code-level seismic forces in accordance with Section 301.1.4.2, unless an evaluation demonstrates compliance of such items.

    SECTION908
    ENERGY CONSERVATION

    908.1 Minimum requirements.

    Level 3 alterations to existing buildings or structures are permitted without requiring the entire building or structure to comply with the energy requirements of the International Energy Conservation Code or International Residential Code. The alterations shall conform to the energy requirements of the International Energy Conservation Code or International Residential Code as they relate to new construction only.

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