The walls, wall coverings and ceilings of walk-in refrigeration units, food preparation areas, warewashing areas and toilet rooms and their vestibules shall be smooth, nonabsorbent and easily cleanable. Concrete or pumice blocks and bricks used for interior wall construction in these locations shall be finished and sealed to provide a smooth, easily cleanable surface.
N.Y. Comp. Codes R. & Regs. Tit. 1 §§ 271-7.7