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Cmu guide FRANKLIN SERIES GRAY CONCRETE MASONRY ? JEFFERSON SERIES ARCHITECTURAL COLOR MASONRY Concrete Masonry Units Size and Shape Guide www specblockusa com Concrete Block How to Calculate Fire Ratings for Concrete Block International Standard Building

FRANKLIN SERIES GRAY CONCRETE MASONRY ? JEFFERSON SERIES ARCHITECTURAL COLOR MASONRY Concrete Masonry Units Size and Shape Guide www specblockusa com Concrete Block How to Calculate Fire Ratings for Concrete Block International Standard Building Code Southern Building Code Congress International Edition Chapter Section The ?re resistance ratings of walls and partitions constructed of concrete masonry units shall be determined from Table The rating shall be based on the equivalent thickness of the masonry and type of aggregate used Table Minimum Equivalent Thickness Inches of Loadbearing or Nonloadbearing Concrete Masonry Walls Concrete Block are commonly referred to as ??CMUs ? Concrete Masonry Units ??Grey Block ? or simply ??Concrete Block ? The following are keyed names commonly used to further describe di ?erent types of concrete block A Scored B Stretcher End Mortar Groove C Breaker D Sash Groove E Plain End F Rectangular Core G Pear Core H Split Face J Bullnose Double shown All split-face masonry units are available in grey and Block USA standard colors Type of Aggregate Expanded Shale Clay or Slate Fire Resistance Rating hours Values between those shown in the table can be determined by direct interpolation Contact producer to verify aggregate and net volume Certi ?cations provided by each producer member as requested Thickness shown for concrete masonry is equivalent thickness de ?ned as the average thickness of solid material in the wall and is represented by the the formula T Vn E L x H Where T Equivalent thickness in inches VE Net volume gross volume less volume n of voids in cubic inches L Length of block in inches H Height of block in inches Source SBCCI Compressive Strength of Concrete Masonry PSI Gross Area to Net Area Conversion Based on average of units height and above Comment ASTM C- is the standard of masonry production speci ?cations in the United States With the approval of ACI - speci ?cations and the issue of ASTM C- - there is one major speci ?cation change to note In the past block compressive strength psi was based on gross area requiring an average psi The strength requirements have not changed but the measurements have All new speci ?cations now are based on net area of psi To assist you in calculating the net area please follow the formula below Given the gross area compressive strength you may determine the net area by knowing percent solids of unit or equivalent thickness of unit Example cmu with a known psi gross area at solids Compressive Strength Gross Area x Compressive Strength Percent Solids Net Area psi x psi Example cmu actual size with a known psi gross area with an equivalent thickness of Compressive Strength Actual Compressive Strength Gross Area x Thickness Net Area Equivalent Thickness psi x psi Block manufacturers have gross-area psi data as well as solids and equivalent strength numbers Most will have the net-area compressive strength psi with future test results Dimensions -Inch Unit Con ?gurations -Inch Unit Con ?gurations -Inch Unit