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711.1 General
Horizontal assemblies shall comply with Section 711.2. Nonfire-resistance-rated floor and roof assemblies shall comply with Section 711.3.
711.2 Horizontal Assemblies
Horizontal assemblies shall comply with Sections 711.2.1 through 711.2.6.
711.2.1 Materials
Assemblies shall be of materials permitted by the building type of construction.
711.2.2 Continuity
Assemblies shall be continuous without vertical openings, except as permitted by this section and Section 712.
711.2.3 Supporting Construction
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:
  1. Horizontal assemblies at the separations of incidental uses as specified by Table 509.1 provided that the required fire-resistance rating does not exceed 1 hour.
  2. Horizontal assemblies at the separations of dwelling units and sleeping units as required by Section 420.3.
  3. Horizontal assemblies at smoke barriers constructed in accordance with Section 709.
711.2.4 Fire-Resistance Rating
The fire-resistance rating of horizontal assemblies shall comply with Sections 711.2.4.1 through 711.2.4.6 but shall be not less than that required by the building type of construction.
711.2.4.1 Separating Mixed Occupancies
Where the horizontal assembly separates mixed occupancies, the assembly shall have a fire-resistance rating of not less than that required by Section 508.4 based on the occupancies being separated.
711.2.4.2 Separating Fire Areas
Where the horizontal assembly separates a single occupancy into different fire areas, the assembly shall have a fire-resistance rating of not less than that required by Section 707.3.10.
711.2.4.3 Dwelling Units and Sleeping Units
Horizontal assemblies serving as dwelling or sleeping unit separations in accordance with Section 420.3 shall be not less than 1-hour fire-resistance-rated construction.
Exception: Horizontal assemblies separating dwelling units and sleeping units shall be not less than 1/2-hour fire-resistance-rated construction in a building of Types IIB, IIIB and VB construction, where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.
711.2.4.4 Separating Smoke Compartments
Where the horizontal assembly is required to be a smoke barrier, the assembly shall comply with Section 709.
711.2.4.5 Separating Incidental Uses
Where the horizontal assembly separates incidental uses from the remainder of the building, the assembly shall have a fire-resistance rating of not less than that required by Section 509.
711.2.4.6 Other Separations
Where a horizontal assembly is required by other sections of this code, the assembly shall have a fire-resistance rating of not less than that required by that section.
711.2.5 Ceiling Panels
Where the weight of lay-in ceiling panels, used as part of fire-resistance-rated floor/ceiling or roof/ceiling assemblies, is not adequate to resist an upward force of 1 pound per square foot (48 Pa), wire or other approved devices shall be installed above the panels to prevent vertical displacement under such upward force.
711.2.6 Unusable Space
In 1-hour fire-resistance-rated floor/ceiling assemblies, the ceiling membrane is not required to be installed over unusable crawl spaces. In 1-hour fire-resistance-rated roof assemblies, the floor membrane is not required to be installed where unusable attic space occurs above.
711.3 Nonfire-Resistance-Rated Floor and Roof Assemblies
Nonfire-resistance-rated floor, floor/ceiling, roof and roof/ceiling assemblies shall comply with Sections 711.3.1 and 711.3.2.
711.3.1 Materials
Assemblies shall be of materials permitted by the building type of construction.
711.3.2 Continuity
Assemblies shall be continuous without vertical openings, except as permitted by Section 712.

Related Code Sections

Section 711 Fire and Smoke Protection Features, Floor and Roof Assemblies
Horizontal assemblies shall comply with Section 711.2. Nonfire-resistance-rated floor and roof assemblies shall comply with Section 711.3 ...
Section 711 Fire and Smoke Protection Features, Floor and Roof Assemblies
Horizontal assemblies shall comply with Section 711.2. Nonfire-resistance-rated floor and roof assemblies shall comply with Section 711.3 ...
711.2 Fire and Smoke Protection Features, Horizontal Assemblies
, used as part of fire-resistance-rated floor/ceiling or roof/ceiling assemblies, is not adequate to resist an upward force of 1 pound per square foot (48 ...
711.2 Fire and Smoke Protection Features, Horizontal Assemblies
as part of fire-resistance-rated floor/ceiling or roof/ceiling assemblies, is not adequate to resist an upward force of 1 pound per square foot (48 Pa ...