fire wall

General Definition (a) A “fire wall” is a fire-resistance-rated smoke-tight wall having protected openings which restricts the spread of fire and extends vertically without offset, continuously from the foundation to or through the roof, and is in accordance with the specifications of the New York City Building Code for fire walls or fire wall separations, as applicable. (b) Where a wall constructed prior to February 2, 2011, does not meet the requirements of paragraph (a), but does meet the fire wall specifications of the New York City Building Code pursuant to which it was constructed, such wall shall be considered a fire wall. In the event that such wall either fails to meet such specifications, or no specifications for fire walls existed at the time of its construction, the Commissioner of the Department of Buildings shall determine whether such wall shall be considered a fire wall for the purpose of determining the boundary of a building.