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BOCA BASIC/NATIONAL BUILDING CODE
Building Officials Conference of America, Inc.
(1994 Supplement)
Recommended Analytical Methods for Concrete Masonry
4.5 Calculation method: The fire resistance of concrete masonry assemblies shall be determined in accordance with the requirements of the following provisions.
4.6 Equivalent thickness
4.6.1 Ungrouted or partially grouted construction: The equivalent thickness of concrete masonry assemblies, Tea, shall be the equivalent thickness of the concrete masonry unit, Te, determined in accordance with ASTM C 140, "Standard Methods of Sampling and Testing Concrete Masonry Units," plus the equivalent thickness of finishes, Tef, (see 4.6.3, Finishes).
Tea = Te + Tef
4.6.2 Solid grouted construction: The equivalent thickness, Te, or concrete masonry units which are solidly grouted shall be taken as the specified thickness of the unit.
4.6.4 Filling cells with loose fill material: The equivalent thickness of concrete masonry units filled with loose fill materials complying with the following requirements shall be taken as the specified thickness.
Loose fill material placed in the cells of hollow masonry units to increase the fireresistance rating of the assembly shall be sand, pea gravel, crushed stone, or slag (ASTM C33, "Specification for Concrete Aggregates"); pumice, scoria, expanded fly ash, cinders (ASTM C331, "Specification for Lightweight Aggregates for Concrete Masonry Units," ASTM C332, "Specification for Lightweight Aggregates for insulating Concrete"): or perlite (ASTM C549, "Standard Specification for Perlite Loose Fill Insulation) or vermiculite (ASTM C516, "Standard Specification for Vermiculite Loose Fill Thermal Insulation").
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