Wisconsin Administrative Code
Department of Agriculture, Trade and Consumer Protection
ATCP 55-89 - Food, Lodging, and Recreation Safety
Chapter ATCP 75 - Retail Food Establishments
Appendix - Wisconsin Food Code
Chapter 6 - Physical Facilities
Part 6-1 - MATERIALS FOR CONSTRUCTION AND REPAIR
Subpart 6-102 - Outdoor Areas
Section 6-102.11 - Surface Characteristics

(A) The outdoor walking and driving areas shall be surfaced with concrete, asphalt, or gravel or other materials that have been effectively treated to minimize dust, facilitate maintenance, and prevent muddy conditions.

(B) Exterior surfaces of buildings and MOBILE FOOD ESTABLISHMENTS shall be of weather-resistant materials and shall comply with LAW.

(C) Outdoor storage areas for REFUSE, recyclables, or returnables shall be of materials specified under §§ 5-501.11 and 5-501.12.