Exterior Wall 2 : The wall that separates the interior from the exterior of a building; it is usually exposed to the weather and forms the extent or boundary of the building
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}