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// CODE SNIPPET

722.3.1 Equivalent Thickness

Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.1 Equivalent Thickness
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The equivalent thickness of concrete masonry construction shall be determined in accordance with the provisions of this section.

722.3.1.1 Concrete Masonry Unit Plus Finishes

The equivalent thickness of concrete masonry assemblies, Tea, shall be computed as the sum of the equivalent thickness of the concrete masonry unit, Te, as determined by Section 722.3.1.2, 722.3.1.3 or 722.3.1.4, plus the equivalent thickness of finishes, Tef, determined in accordance with Section 722.3.2:
(Equation 7-6)

722.3.1.2 Ungrouted or Partially Grouted Construction

Te shall be the value obtained for the concrete masonry unit determined in accordance with ASTM C140.

722.3.1.3 Solid Grouted Construction

The equivalent thickness, Te, of solid grouted concrete masonry units is the actual thickness of the unit.

722.3.1.4 Airspaces and Cells Filled With Loose-Fill Material

The equivalent thickness of completely filled hollow concrete masonry is the actual thickness of the unit where loose-fill materials are: sand, pea gravel, crushed stone, or slag that meet ASTM C33 requirements; pumice, scoria, expanded shale, expanded clay, expanded slate, expanded slag, expanded fly ash, or cinders that comply with ASTM C331; or perlite or vermiculite meeting the requirements of ASTM C549 and ASTM C516, respectively.

Related Code Sections


722.3.1 Fire and Smoke Protection Features, Equivalent Thickness
The equivalent thickness of concrete masonry construction shall be determined in accordance with the provisions of this section ...
Building Code 2021 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.1 Equivalent Thickness
722.3.1 Fire and Smoke Protection Features, Equivalent Thickness
The equivalent thickness of concrete masonry construction shall be determined in accordance with the provisions of this section ...
Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.1 Equivalent Thickness
722.3.1.3 Fire and Smoke Protection Features, Solid Grouted Construction
The equivalent thickness, T e , of solid grouted concrete masonry units is the actual thickness of the unit ...
Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.1 Equivalent Thickness > 722.3.1.3 Solid Grouted Construction
722.3.1.4 Fire and Smoke Protection Features, Airspaces and Cells Filled With Loose-Fill Material
The equivalent thickness of completely filled hollow concrete masonry is the actual thickness of the unit where loose-fill materials are: sand, pea ...
Building Code 2021 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.1 Equivalent Thickness > 722.3.1.4 Airspaces and Cells Filled With Loose-Fill Material
722.3.1.4 Fire and Smoke Protection Features, Airspaces and Cells Filled With Loose-Fill Material
The equivalent thickness of completely filled hollow concrete masonry is the actual thickness of the unit where loose-fill materials are: sand, pea ...
Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.1 Equivalent Thickness > 722.3.1.4 Airspaces and Cells Filled With Loose-Fill Material
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