Section 152. Fire-stopping

1. In every wall where wooden furring is used
  every course of masonry from the under side to  the  top  of  any  floor
  beams  shall  project a distance of at least two inches beyond each face
  of the wall that is not on the outside of  the  dwelling;  and  whenever
  floor  beams  run  parallel  to a wall and wooden furring is used, every
  such beam shall always be kept at least two inches away from  the  wall,
  and  the  space between the beams and the wall shall be built up solidly
  with brickwork from the under side to the top of the floor beams.
    2. Whenever a wall is studded off, the space between an inside face of
  the wall and the studding at any  floor  level  shall  be  fire-stopped.
  Every  space  between  beams  directly over a studded-off space shall be
  fire-stopped by covering the bottom of the beams  with  metal  lath  and
  plaster and placing a loose fill of incombustible material at least four
  inches  thick  on  the  plaster between the beams, or hollow-burned clay
  tile or gypsum plaster partition blocks, at least four inches  thick  in
  either  case  and  supported by cleats, shall be used to fill the spaces
  between beams.
    3. Partitions which are not parallel with the  wood  floor  beams  and
  which  separate  one  apartment  or suite from another or any part of an
  apartment or suite from a public hall or  other  part  of  the  dwelling
  outside  the  apartment  or  suite  shall  be  filled  in  solidly  with
  incombustible material between the floor beams from  the  plate  of  the
  partition below to the full depth of the floor beams.
    4.  If a dwelling is within ten feet of another non-fireproof building
  or of a side lot line, such dwelling shall have its  eaves  or  cornices
  built up solidly with masonry.
    5.  The  wooden frames in any cornice on any row of buildings shall be
  separated between buildings by a complete fire-stop.
    6. Every space between stair  carriages  of  any  non-fireproof  stair
  shall  be fire-stopped by a header beam at top and bottom. Where a stair
  run is not all in one room or open space, the stair carriages shall have
  an intermediate firestop, so located as to cut off communication between
  portions of the stair in different rooms or open spaces.  The  underside
  and stringers of every unenclosed stair of combustible material shall be
  fire-retarded.
    7.  All  partitions required to be fire-retarded shall be fire-stopped
  with   incombustible   material   at   floors,   ceilings   and   roofs.
  Fire-stopping  over  partitions  shall  extend  from  the ceiling to the
  underside of any roofing above. Any space between the top of a partition
  and the underside of roof boarding shall be completely fire-stopped.