It shall be unlawful for any person to permit to accumulate on any premises, improved or vacant, any lumber, boxes, barrels, bricks, stones or similar materials unless the same are placed on open racks that are elevated not less than 18 inches above the ground and evenly piled or stacked so as not to afford harborage for rats.
(`86 Code, § 10-54) Penalty, see § 1-99