It shall be unlawful to store ashes inside of any non-fire-proof building unless they are stored in a noncombustible container or receptacle, and a clearance of at least five feet shall be maintained between such container or receptacle and any combustible materials not placed therein. Ashes shall not be stored outside of any building in wooden, plastic or paper product receptacles or dumped in contact with or in close proximity to any combustible materials.