§ 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.