A. The floor surfaces in kitchens, in all other rooms and areas in which food is stored or prepared and in which utensils are washed, and walk-in refrigerators, dressing or locker rooms and toilet rooms, shall be of smooth, nonabsorbent materials and so constructed as to be easily cleanable; provided, that the floors of nonrefrigerated, dry food storage areas need not be nonabsorbent. All floors shall be kept clean and in good repair. Floor drains shall be provided in all rooms where floors are subjected to flooding-type cleaning or where normal operations release or discharge water or other liquid waste on the floor. All exterior areas where food is served shall be kept clean and properly drained, and surfaces in such areas shall be finished so as to facilitate maintenance and minimize dust.

B. The walls and ceilings of all rooms shall be kept clean and in good repair. All walls of rooms or areas in which food is prepared, or utensils or hands are washed, shall be easily cleanable, smooth and light colored, and shall have washable surfaces up to the highest level reached by splash or spray. (1961 code § 6.06.140.)