722.3.1 Equivalent Thickness

The equivalent thickness of concrete masonry construction shall be determined in accordance with the provisions of this section.

The equivalent thickness of concrete masonry assemblies, T_ea, shall be computed as the sum of the equivalent thickness of the concrete masonry unit, T_e, as determined by Section 722.3.1.2, 722.3.1.3 or 722.3.1.4, plus the equivalent thickness of finishes, T_ef, determined in accordance with Section 722.3.2:

T_e shall be the value obtained for the concrete masonry unit determined in accordance with ASTM C 140.

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

The equivalent thickness of completely filled hollow concrete masonry is the actual thickness of the unit when loose-fill materials are: sand, pea gravel, crushed stone, or slag that meet ASTM C 33 requirements; pumice, scoria, expanded shale, expanded clay, expanded slate, expanded slag, expanded fly ash, or cinders that comply with ASTM C 331; or perlite or vermiculite meeting the requirements of ASTM C 549 and ASTM C 516, respectively.