Indoor areas, surface characteristics

(a) Except as specified in (b) of this Section, materials for indoor floor, wall, and ceiling surfaces under conditions of normal use shall be: (1) Smooth, durable, and easily cleanable for areas where food establishment operations are conducted. In food preparation and warewashing areas, the Light Reflectivity Value (LRV) of walls and ceiling surfaces shall be fifty percent (50%) or greater to aid in thorough cleaning of these areas. (2) Closely woven and easily cleanable carpet for carpeted areas; and (3) Nonabsorbent for areas subject to moisture such as food preparation areas, walk-in refrigerators, warewashing areas, employee toilet rooms, mobile food establishment servicing areas, and areas subject to flushing or spray cleaning methods. (b) In a temporary food establishment: (1) If graded to drain, a floor may be concrete, machine-laid asphalt, or dirt or gravel if it is covered with mats, removable platforms, duckboards, or other suitable approved materials that are effectively treated to control dust and mud; and (2) Walls and ceilings may be constructed of a material that protects the interior from the weather and windblown dust and debris.