OAR 333-031-0008: Insect and Rodent Control

(1) Insect and rodent control measures to safeguard public health and to prevent nuisance to the public shall be applied. Developed areas, buildings, and structures shall be maintained free of accumulations of debris. (2) All floors not constructed of solid concrete or other effective rodent-proof and moisture-proof foundation material shall be built so that the minimum clearance between the bottom of floor joists or bottom of floors without joists and the ground beneath shall be 18 inches and so that the minimum clearance under girders shall be 12 inches. The space underneath shall be kept free from obstructions. This rule shall be applied to structures in recreation parks built after January 25, 1970.