All buildings or structures, regardless of use or height, which are vacant shall be maintained by the owner so as to prevent ingress into or egress from the building. All doors, windows and other means of ingress into or egress from such a building or structure shall be kept locked or secured.
The method used in boarding up any building or structure, regardless of use or height, shall be as follows:
All broken glass shall be removed from the doors or windows of said building or structure.
All openings shall be entirely boarded up with either plywood or pressboard having a minimum thickness of 3/8 inch.
All plywood or pressboard used in boarding up shall be painted with a blue-gray exterior paint. The color and quality of the paint is subject to the approval of the Building Inspector.
All openings which are not within 10 feet of ground level at their lowest point and which are not readily accessible from ground level or from neighboring buildings or structures shall have a one-square-foot opening on the top of the enclosure which shall be covered by a quarter-inch wire mesh screen. Louvers may be used in place of the wire mesh screen, provided that they do not inhibit the ventilation.