joisted masonry construction

Exterior walls of masonry material (adobe, brick, concrete, gypsum block, hollow concrete block, stone, tile, or similar materials), with combustible floor and roof. 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, noncombustible, masonry noncombustible, modified fire-resistive, and fire-resistive.