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5 .5- ► End Flanges: <br /> 5.5:1 for units having end flanges, the. thickness of each flange shall not be less than the minimum face shell thickness. <br /> 6 PERMISSIBLE VARIATIONS IN DIMENSIONS . , <br /> 6 . 1 . ► Overall dimensions for width, height and length of a smooth surface shall not differ by mare than t0/8" from the specified standard <br /> dimension. <br /> 6.2 Variations in the initiating point of the split - on top, bottom, or sided shall riot vary more than ±1 /8 <br /> 6. 3 ► Thetheoretical plane established by Me split surface shall not vary more than t0/4F, . <br /> -6.4 ► The length of CMU's that are fluted or scored shall not 'vary more than ±1 /16' . <br /> 7 FINISH AND APPEARANCE <br /> 7. 1 ► All units shall be. sound and free of cracks or other defects that would interfere with the proper placing of the unit or would significantly <br /> impair the strength or permanence . <br /> of the construction. Minor cracks incidental to the usual method of manufacture; or minor chipping resulting from customary methods of handling <br /> in shipment and <br /> delivery, are not grounds for rejection. <br /> 7.2 ► Chips & Cracks - five percent of a shipment may contain slight cracks or small chips not. larger than I in. in any dimension: <br /> Units used in exposed wall construction, ' <br /> Me face or faces that are to be exposed ;hall not show objectionable imperfections when viewed .from a distance of not less than 60 .feet <br /> under diffused lighting. <br /> 73. 0o Color & Texture' - The color and texture shall be specified by the -purchaset. The finished surfaces that will be' exposed shall conform <br /> to. an approved sample consisting <br /> of not less than two. units of each color. <br /> 7.4 ► Test Panel • A test panel shag be constructed, of contractor's expense. The panel is to be not'less Man 4' high by 6' long arld shag <br /> be viewed for acceptance ata distance . <br /> of not less than 60 feet under diffused light. The tooling 'of mortar, general quality, texture; and color of block shall be as required <br /> for the project and by the project <br /> documents.. The consistency' of color cannot be reliably assured from test panel viewing as too few block and mortar batches are involved. Block <br />-of each size, style <br /> or type may be impractical to construct into a test panel. <br /> 8 OTHER REQUIREMENTS <br /> 8. 1 ► Acoustical Rating' When special acoustical properties of CMU are required, they shallbe specified. <br /> 8.2 ► Admixture: Admixture shrill be compatible with CMU's and mortor: <br /> 8.3 ► Fire rating: When a specific fire rating is required, it shall be specified by the architect and certificate supplied by the CMU producer. <br /> This certification will show the fire <br /> rating based on theequivalent thickness and type of aggregate. <br /> 8 ,4 Mortar: A type S mortar shall be' used* ` . <br /> 8,5 . ► - R Value: When energy properties of the CMU and/or wall system are specified, Me 'required density of the CMU and insulation material shall <br />be' specified by the <br /> architect and certificate supplied by the CMU producer. . . <br /> 8.6. ► Strength: When higher strength CMU's are required,- the strength shag be specified by the architect/engineerand certified by the manufacturer.' <br /> 8. 7 Poo Weight: When o'specific weight or density is specified, the producer of the CMU.shall furnish a recent.certifi ation complying with <br /> the required weight. <br /> 9 SAMPLING AND TESTING <br /> 9. 1 ► The purdiaser or authorized representative shall be accorded proper facilities to inspect and sample the CMU's of the place of manufacture <br /> from . the lots ready for delivery. <br /> 9.2 ► Sample and test units, by a . CMEC accreditedlaboratory; In accordance with ASTM Method C-140. , <br /> - . TABLE 3 <br /> STRENGTH AND ABSORPTION REQUIREMENTS <br /> Compressive . Sfrength Minimum PSI ' Water Absorption Max.• Ib/cf (Av. 3 units) With Oven Dry Weight of Concrete Ib/cf <br /> ► Average Net Area ' Weight Classification <br /> ► Average of'3 Units * Individual Unit ►. light Weight Max: 10SI lb/d ► Medium Weight 106-121 Ib/cf ' P, Normal Weight more than 128 Ib/if <br /> - •2800 2S00 . 14 12 10 <br /> u. Nigher compressive strengths may be specified .when required by design. Consult with local suppliers to determine avolabiliry of units of higher <br /> compressive strength. <br /> b. To prevent water :penetration, proper detailing; construction, flashing and drainage should be provided. ' <br /> phone: 1 -• 800 4 • TARMAC url: www. tarmacamerica . com ; 3/98 <br />