Division 7 Ebook Page 580 CMU Structural Fire Resistance ASTM E119 Tech Bulletin

Technical Bulletin SS-03 ENCLOSURE SOLUTIONS Technical Bulletin CMU-03 Structural Fire Resistance ASTM E119 Types of Construction and Fire Resistance Ratings The International Building Code 2 (IBC), Section 602, identifies building construction classifications. Some classifications require exterior wall fire resistance ratings of 1, 2 or 3 hours depending on building characteristics, including use and occupancy classification, height and area, fire separation distances, and other details. Testing Fire Resistance Ratings IBC Section 703 specifies that the fire resistance rating of building walls be determined in accordance with one of several alternative methods including ASTM E119 testing or engineering analysis (Section 703.3.4). ASTM E119 ASTM E119, Standard Test Methods for Fire Tests of Building Construction and Materials 1 , evaluates the duration for which building elements such as the Owens Corning Enclosure Solutions Concrete Masonry Unit (CMU) with Masonry Veneer Wall Systems will contain a fire and retain its structural integrity during a fire test exposure. The test exposes a wall assembly to a controlled time/temperature fire exposure for a specified time period. The timed fire exposure is followed by the application of a fire hose stream to evaluate the ability of the fire weakened assembly to withstand both the thermal shock of a sudden cold water stream, and its retained structural integrity. The test standard measures the transmission of heat and hot gases through the wall assembly. For load bearing walls the standard also measures the load carrying ability of the wall assembly during the test exposure. Owens Corning Enclosure Solutions Wall System Fire Resistance Rating The Owens Corning Enclosure Solutions CMU Wall System is fire resistance rated for 2, 3 or 4 hours depending on the type of concrete masonry unit. See Table 1 for additional details. Some assemblies and system descriptions are are available in the Underwriters Laboratories OnLine Certifications Directory, Fire Resistance Rated Design No. U938 for complete UL specifications. Table 1: CMU (Multi-Wythe Masonry Cavity Wall, and Single Wythe CMU) Fire Resistance Rated Wall System Summary Component Design Options via Third Party Engineering Analysis* UL Assembly U902 UL Assembly U912 UL Assembly U938 UL Assembly U939 Interior fire Rating 2, 3 or 4 hour 4 hour 3 hour 2, 3 or 4 hour Structural Bearing or Non-Bearing Bearing Bearing Concrete Block (CMU) Various designs. Classification 2-4 Hr. See UL Concrete Blocks category for list of eligible manufacturers. Various designs, Classification D-2 (2 h). See Concrete Blocks category for list of eligible manufacturers Various designs, Classification D-2 (2 h). See Concrete Blocks category for list of eligible manufacturers Various designs. Classification 2-4 Hr. See UL Concrete Blocks category for list of eligible manufacturers. Various designs. Classification 2-4 Hr. See UL Concrete Blocks category for list of eligible manufacturers. Mortar Blocks laid in full bed of mortar, nom. 3/8 in. thick, of not less than 2-1/4 and not more than 3-1/2 parts of clean sharp sand to 1 part Portland cement (proportioned by volume) and not more than 50 percent hydrated lime (by cement volume). Vertical joints staggered. Bricks and blocks laid in full bed of mortar nom. 3/8 in. thick of not less than 2-1/4 and not more than 3-1/2 parts clean sharp sand to 1 part Portland cement (proportioned by vol) and not more than 50 percent hydrated lime (by cement vol). Vertical joints staggered. Bricks and blocks laid in full bed of mortar nom. 3/8 in. thick of not less than 2-1/4 and not more than 3-1/2 parts clean sharp sand to 1 part Portland cement (proportioned by vol) and not more than 50 percent hydrated lime (by cement vol). Vertical joints staggered. Blocks laid in full bed of mortar, nom. 3/8 in. thick, of not less than 2-1/4 and not more than 3-1/2 parts of clean sharp sand to 1 part Portland cement (proportioned by volume) and not more than 50 percent hydrated lime (by cement volume). Vertical joints staggered. Blocks laid in full bed of mortar, nom. 3/8 in. thick, of not less than 2-1/4 and not more than 3-1/2 parts of clean sharp sand to 1 part Portland cement (proportioned by volume) and not more than 50 percent hydrated lime (by cement volume). Vertical joints staggered. Air & Water Resistive Barrier Any WRB listed in Tables 2a or 2b N/A Tremco ExoAir 230, applied to completely cover the concrete blocks at a min thickness of 35 mil (0.9 mm) dry, 70 mil (1.8 mm) wet thickness. N/A (See Foamular XPS CI with FoamSealR taped joints)

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