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    "dba": "Bollinsure Insurance Services",
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    "licenseAuthority": "California Department of Insurance"
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  "title": "Building construction categories (ISO), insurance glossary definition",
  "publisher": "International Risk Management Institute (IRMI)",
  "url": "https://www.irmi.com/term/insurance-definitions/building-construction-categories-(iso)",
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  "accessedDate": "2026-08-31",
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  "updateCadence": "Glossary entry; updated by the publisher as terminology changes.",
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      "text": "IRMI's glossary states that these categories were established by Insurance Services Office, Inc. (ISO) in its Commercial Lines Manual for purposes of developing rates for insuring commercial property based on susceptibility to damage by fire."
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      "text": "IRMI lists six categories from least to most fire resistive with their construction codes: frame (1), joisted masonry (2), noncombustible (3), masonry noncombustible (4), modified fire resistive (5), and fire resistive (6)."
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  "citation": {
    "text": "International Risk Management Institute (IRMI). \"Building construction categories (ISO), insurance glossary definition.\" unknown. https://www.irmi.com/term/insurance-definitions/building-construction-categories-(iso) (retrieved 2026-08-31).",
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