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Categories of building construction 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. The six ISO CLM building construction categories and the associated ISO construction codes, from the least fire-resistive category to the most fire-resistive category, are as follows.
The American Association of Insurance Services (AAIS) uses nearly identical building construction categories in its materials addressing the development of rates for insuring commercial property in several of its programs.
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Commercial Property