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711.2.3 Supporting Construction
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The supporting construction shall be protected to afford the required fire-resistance rating of the horizontal assembly supported.
Exception: In buildings of Type IIB, IIIB or VB construction, the construction supporting the horizontal assembly is not required to be fire-resistance rated at the following:
- Horizontal assemblies at the separations of incidental uses as specified by Table 509 provided that the required fire-resistance rating does not exceed 1 hour.
- Horizontal assemblies at the separations of dwelling units and sleeping units as required by Section 420.3.
- Horizontal assemblies at smoke barriers constructed in accordance with Section 709.
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