6 Va. Admin. Code § 15-81-1160
Perimeter walls shall be of masonry, concrete, stone, metal, or other similar durable nonfabric, noncombustible material. The reviewing authority may require that perimeter walls, floor, and roof or ceiling meet secure perimeter requirements.
§§ 53.1-5, 53.1-80, and 53.1-82 of the Code of Virginia.
Derived from Virginia Register Volume 34, Issue 12, eff. March 8, 2018.