fire-resistive construction
Exterior walls, floors, and roof of masonry or fire-resistive material with
a fire-resistance rating of at least 2 hours. This is one of six basic construction
types used in categorizing buildings for Insurance Services Office, Inc. (ISO),
Commercial Lines Manual (CLM) rating purposes. The other five construction categories
are: frame, joisted masonry, noncombustible, masonry noncombustible, and modified
fire-resistive.