Skip to code content (skip section selection)
Compare to:
New York City Overview
The New York City Charter
The New York City Administrative Code
The Rules of the City of New York
THE RULES OF THE CITY OF NEW YORK
Title 1: Department of Buildings
Title 2: Board of Standards and Appeals
Title 3: Fire Department
Title 6: Department of Consumer and Worker Protection
Title 9: Procurement Policy Board Rules
Title 12: Franchise and Concession Review Committee
Title 15: Department of Environmental Protection
Title 16: Department of Sanitation
Title 17: Business Integrity Commission
Title 19: Department of Finance
Title 20: Tax Appeals Tribunal
Title 21: Tax Commission
Title 22: Banking Commission
Title 24: Department of Health and Mental Hygiene
Title 25: Department of Mental Health and Retardation [Repealed]
Title 28: Housing Preservation and Development
Title 29: Loft Board
Title 30: Rent Guidelines Board
Title 31: Mayor's Office of Homelessness and Single Room Occupancy
Title 34: Department of Transportation
Title 35: Taxi and Limousine Commission
Title 38: Police Department
Title 38-A: Civilian Complaint Review Board
Title 39: Department of Correction
Title 40: Board of Correction
Title 41: Department of Juvenile Justice
Title 42: Department of Probation
Title 43: Mayor
Title 44: Comptroller
Title 45: Borough Presidents
Title 46: Law Department
Title 47: Commission on Human Rights
Title 48: Office of Administrative Trials and Hearings (OATH)
Title 49: Department of Records and Information Services
Title 50: Community Assistance Unit
Title 51: City Clerk
Title 52: Campaign Finance Board*
Title 53: Conflicts of Interest Board
Title 55: Department of Citywide Administrative Services
Title 56: Department of Parks and Recreation
Title 57: Art Commission
Title 58: Department of Cultural Affairs
Title 60: Civil Service Commission
Title 61: Office of Collective Bargaining
Title 62: City Planning
Title 63: Landmarks Preservation Commission
Title 66: Department of Small Business Services
Title 67: Department of Information Technology and Telecommunications
Title 68: Human Resources Administration
Title 69: Department of Aging
Title 70: In Rem Foreclosure Release Board
Title 71: Voter Assistance Commission
Title 72: Office of Emergency Management
Title 73: Civic Engagement Commission
§ 27-340 Fire divisions.
Fire divisions shall be constructed of noncombustible materials or assembly of noncombustible materials to provide the fire-resistance ratings required by table 5-2. Vertical fire divisions shall be continuous between foundation, roof, or horizontal fire divisions, and through any concealed space in floor or roof construction. Horizontal fire divisions shall be continuous between exterior walls and/or vertical fire divisions.
   (a)   When roof construction is combustible on both sides of a vertical fire division, the vertical fire division shall extend through the roof construction to a height of at least four inches above the high point at the roof framing. Decking shall tightly butt the fire division. Above the decking of roofs that are flatter than twenty degrees to the horizontal, blocking shall be constructed to form cants on both sides of the fire division with slopes not steeper than 1:4. Combustible decking shall not extend over the top of the fire division.
   (b)   Except as required in subdivision (c) of this section, when roof construction is noncombustible on one or both sides of a vertical fire division, the vertical fire division may terminate at the underside of the noncombustible roof construction provided the junction of the wall and roof construction is made smoke tight.
   (c)   When a vertical fire division is required by table 5-2 to have a fire-resistance rating of three or four hours, and the roof construction has a fire-resistance rating of less than two hours, the fire division shall extend above the roof construction to form a parapet at least three feet high.
   (d)   Fire divisions shall be so constructed that the removal or collapse of construction on one side will not endanger the support of construction on the other side.
   (e)   Fire divisions shall be made smoketight at their junction with exterior walls. In buildings of construction class II-D and II-E, exterior walls shall be constructed of noncombustible materials for a distance of at least eighteen inches on each side of the fire division, or the fire division shall project at least twelve inches through the exterior wall.
   (f)   Fire divisions may be offset if the construction between the offset divisions, including their supports, has at the same fire-resistance rating as the fire division, with all hollow spaces within the construction firestopped with noncombustible material.
   (g)   Where combustible members such as joists, beams, or girders bear on, or frame into, vertical fire divisions, such members shall not extend through the wall and shall have at least four inches of solid noncombustible material below, at the sides, and at the ends of each such member.
   (h)   Chases or recesses shall not be cut into fire divisions so as to reduce their thickness below that required for the fire-resistance rating.
   (i)   Vertical fire divisions that are hollow shall be firestopped with at least four inches of noncombustible material so as to prevent passage of flame, smoke, or hot gases through the hollow spaces to the story above or below, or to hollow spaces within connecting floor or roof construction.