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joisted masonry construction

Exterior walls of masonry or fire-resistive material (adobe, brick, concrete, gypsum block, hollow concrete block, stone, tile, or similar materials) rated for not less than 1 hour, with combustible floor and roof. Joisted masonry construction has two key disadvantages: (1) floors and roofs of combustible materials are subject to damage by fire, and (2) presence of concealed spaces. Joisted masonry 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.

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