The building construction categories are categories of building construction established by...
joisted masonry construction (ISO)
Joisted masonry construction is one of six building construction categories established by Insurance Services Office, Inc. (ISO), in its Commercial Lines Manual (CLM) for purposes of developing rates for insuring commercial property, based on susceptibility to damage by fire.
Additional Information
The CLM description of joisted masonry construction, followed by the associated ISO construction code, is exterior walls of masonry material (adobe, brick, concrete, gypsum block, hollow concrete block, stone, tile, or similar materials), with combustible floor and roof (Construction Code 2). The construction code indicates the ranking of this building construction category within the six categories, with 1 as the least fire-resistive and 6 as the most fire-resistive.
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