Section 55. Wainscoting

1.  Whenever the surface of walls, partitions or
  ceilings in any  apartment  or  suite  of  rooms  of  any  non-fireproof
  multiple  dwelling  is covered, sheathed or wainscoted wholly or in part
  after April eighteenth,  nineteen  hundred  twenty-nine,  such  covering
  shall  be  backed  solidly with plaster. In fireproof multiple dwellings
  such covering shall be backed solidly and continuously  or  filled  with
  incombustible  material.    In  the  case  of  walls  and  partitions in
  fireproof dwellings, such  backing  and  filling  shall  extend  to  the
  fireproof floor construction and in non-fireproof dwellings to the floor
  beams. All such backing and filling shall be fire-stopped.
    2.  No wood wainscoting other than fireproofed wood complying with the
  provisions of section fifty-eight shall be erected in any  public  hall,
  stair or shaft of any multiple dwelling.