Existing buildings · Defined
Fire-resistance rating
A measure of an assembly’s fire performance established through an applicable test or approved design method.
Why it matters
The rating belongs to an assembly, not just a material label. Altered connections, penetrations, or protective layers can affect the intended performance.
In practice
A project example
A rated wall is compromised by an unprotected opening added during a tenant renovation.
General educational guidance from KOW Building Consultants. Examples are illustrative, not project records. The applicable contract, standard, program, and jurisdiction control the requirements for a specific assignment.