No person shall permit to accumulate on any premises, improved or unimproved, on which evidence of rat infestation is found, or any lots or alleys adjacent to such property, any lumber, boxes, barrels, bricks, stones or any other character of materials that may be used as a harborage for rats unless the same shall be placed on open racks and elevated not less than 18 inches above the ground, with a clear intervening space underneath.
(1964 Code, § 19-370)