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// CODE SNIPPET

722.2.2.3 Multicourse Roofs

Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.2 Concrete Assemblies > 722.2.2 Concrete Floor and Roof Slabs > 722.2.2.3 Multicourse Roofs
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The fire-resistance ratings of roofs that consist of a base slab of concrete with a topping (overlay) of an insulating concrete or with an insulating board and built-up roofing shall comply with Figures 722.2.2.3(1) and 722.2.2.3(2).
For SI: 1 inch = 25.4 mm.
FIGURE 722.2.2.3(1)
FIRE-RESISTANCE RATINGS FOR CONCRETE ROOF ASSEMBLIES
For SI: 1 inch = 25.4 mm.
FIGURE 722.2.2.3(2)
FIRE-RESISTANCE RATINGS FOR CONCRETE ROOF ASSEMBLIES

722.2.2.3.1 Heat Transfer

For the transfer of heat, three-ply built-up roofing contributes 10 minutes to the fire-resistance rating. The fire-resistance rating for concrete assemblies such as those shown in Figure 722.2.2.3(1) shall be increased by 10 minutes. This increase is not applicable to those shown in Figure 722.2.2.3(2).

Related Code Sections


722.2.2.3 Fire and Smoke Protection Features, Multicourse Roofs
The fire-resistance ratings of roofs that consist of a base slab of concrete with a topping (overlay) of an insulating concrete ...
Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.2 Concrete Assemblies > 722.2.2 Concrete Floor and Roof Slabs > 722.2.2.3 Multicourse Roofs
722.2.2.3 Fire and Smoke Protection Features, Multicourse Roofs
The fire-resistance ratings of roofs that consist of a base slab of concrete with a topping (overlay) of an insulating concrete ...
Building Code 2021 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.2 Concrete Assemblies > 722.2.2 Concrete Floor and Roof Slabs > 722.2.2.3 Multicourse Roofs
722.2.2 Fire and Smoke Protection Features, Concrete Floor and Roof Slabs
Reinforced and prestressed floors and roofs shall comply with Section 722.2.2.1. Multicourse floors and roofs shall comply with Sections 722.2.2.2 ...
Building Code 2021 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.2 Concrete Assemblies > 722.2.2 Concrete Floor and Roof Slabs
2603.4.1.5 Plastic, Roofing
A thermal barrier is not required for foam plastic insulation that is a part of a Class A, B or C roof-covering assembly that is installed ...
Building Code 2021 of Illinois > 26 Plastic > 2603 Foam Plastic Insulation > 2603.4 Thermal Barrier > 2603.4.1 Thermal Barrier Not Required > 2603.4.1.5 Roofing
2603.4.1.5 Plastic, Roofing
A thermal barrier is not required for foam plastic insulation that is a part of a Class A, B or C roof-covering assembly that is installed ...
Building Code 2018 of Illinois > 26 Plastic > 2603 Foam Plastic Insulation > 2603.4 Thermal Barrier > 2603.4.1 Thermal Barrier Not Required > 2603.4.1.5 Roofing
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