NY Mult Dwell L § 101 (2021)
2021 New York Laws MDW - Multiple Dwelling Article 4 - Fireproof Multiple Dwellings Title 1 - Fire Protection 101 - Requirements for Fireproof Construction.

§ 101. Requirements for fireproof construction. 1. Every such dwelling   exceeding six stories or seventy-five feet in height shall be fireproof.   No  multiple  dwelling  shall  be altered so as to exceed either of such   heights without being made fireproof.2. In a fireproof multiple dwelling the walls,  floors,  roof,  stairs   and   public  halls  shall  all  be  fireproof  except  as  provided  in   subdivision three. No beams, lintels or other structural  members  shall   be  of wood.  No wood or other inflammable material shall be used in any   of the partitions, furrings or ceilings. For the portion of  a  multiple   dwelling  more than one hundred fifty feet above the curb level, no wood   shall be used except as provided in subdivision  three  and  except  for   interior trim of windows.3. The foregoing requirements shall not be construed as prohibiting:a.  Elsewhere  than  within,  or in the openings to, the public halls,   stairs and shafts, the  use  of  wood  for  sleepers,  grounds,  nailing   blocks,  underflooring,  finish  flooring,  interior  doors  with  their   assemblies and saddles, floor base not more than  one  foot  in  height,   picture  and  wall  moulding,  shelving,  closet  and  kitchen fixtures,   cupboards, cabinets and wardrobes.b. The use of wood for windows and for interior trim and finish backed   solidly against, or filled with, incombustible material when located not   more than one hundred fifty feet above the curb level and elsewhere than   within, or in the openings to, the public halls, stairs and shafts.c. The use within apartments of wood for  decorative  wall  panelling,   wainscoting,  mantels  or  other  interior  finish,  and  the  use in an   entrance hall of wall panelling or wainscoting made of fireproof wood or   other material capable of successfully withstanding standard fire  tests   prescribed  in  the  local building code and in a manner approved by the   department.d. Where fireproof doors are required, the use for  such  doors,  with   their  assemblies  and  saddles, of material and construction capable of   successfully withstanding a one-hour standard fire  test  prescribed  in   the  local  building  code  and  in a manner approved by the department.   Should any door required to be fireproof be found to  have  deteriorated   so that it shall after installation fail to conform to the standard fire   tests  prescribed,  such door shall be removed by the owner and replaced   by him with a door capable of successfully withstanding such tests.4.  All  materials  combustible  in  their  natural  state  which  are   constructed,  processed  or  protected  so  that  they  will not support   combustion shall, before being installed in a multiple dwelling for  any   of  the  uses  herein  specified,  be permanently identified by label or   marking with the name of the manufacturer and the year of manufacture in   a manner approved by the department.5. When required to be fireproof,  any  outer  wall  or  any  wall  or   partition  which  carries  any load in addition to its own weight shall,   unless otherwise in this chapter expressly required, be  constructed  of   materials capable of successfully withstanding a four-hour standard fire   test  prescribed  in the local building code and in a manner approved by   the department. When required to be fireproof,  any  wall  or  partition   which  carries  only  its own weight, other than an outer wall, shall be   constructed of materials capable of successfully withstanding a one-hour   standard fire test prescribed in the local building code and in a manner   approved by the department.