Splitface Masonry Unit Specifications
PART 1 – GENERAL
Submit color samples for selection from manufacturer’s group. Submit product literature, certifications, test reports and full size samples of each color specified.
Certifications: Benchmark Series Splitface Masonry Units shall comply with recommendations of the National Concrete Masonry Association, and conform to ASTM C90, for hollow and solid load bearing units. Units shall be normal weight surfaces block, withstanding compression test loads of at least 3,000 psi for individual units, or 3,500 psi for an average of five units; basing load figures on the average net area of the blocks. Units shall meet or exceed requirements for ASTM C55-06e1. Benchmark Splitface Masonry Units shall be submitted for establishing an approved color and texture.
Fire Resistance:Hourly fire rating information, defined and required by NCMA TEK NOTES, available at www.grandblanccement.com.
Oversize Units: Benchmark Splitface Masonry Units are typically oversize units that meet or exceed the specifications set forth and required by ASTM C90 and ASTM C55-06e1. See sizes and shapes for details or visit website for more information at www.grandblanccement.com.
PART 2 – PRODUCTS
Benchmark Splitface Masonry Units
SIZES AND SHAPES
4 x 8 x 12, 4 x 12 x 12, 4 x 12 x 16, 4 x 16 x 16, 4 x 4 x 24, 4 x 8 x 24, 4 x 12 x 24, 4 x 16 x 24
Grand Blanc Cement Products, Inc. 10709 S. Center Road Grand Blanc, MI 48439 P 800-875-7500 F 810-694-2995
PART 3 – EXECUTION
LAYING MASONRY WALLS
All Benchmark Splitface Masonry Units shall be draw n from more than one pallet at a time and must be laid using the best concrete masonry practices. Lay block with the faces level, plumb and true to the mason line strung horizontally at the finished side of the block. Both horizontal and vertical joints should be 3/8″ on the finished side of the w all. Joints should be neatly and uniformly tooled after they are finger-hard. Cut pieces should be sized and placed properly to maintain bond and consistency.
Lighting: Always use adequate lighting for masonry work. For even and consistent illumination, always place lights at a reasonable distance from the wall. For best results, do not use trough lighting.
Cutting: Use the correct type of motor driven masonry saws to make all cuts, including those for bonding, holes, boxes etc. Use diamond or abrasive blades and make neat cuts to provide the best appearance. Avoid cuts that may alter or detract from the finished look of Splitface Masonry.
MORTAR BED & JOINTING
Units shall be laid with full mortar coverage on head and bed joints without blocking cores. All joints shall be tooled when finger-print hard into a concave shape. Remove mortar from the face of masonry before it sets. Tuck-point all joints of scored units for creating proper appearance. All exterior scored units must be tuck-pointed to prevent water penetration. DO NOT RAKE JOINTS.
During the installation process, walls should be kept as clean as possible by using brushes, sponges, etc. Never allow excess mortar or smears to harden on the finished surfaces of block. Avoid using harsh cleaning methods that will result in damaged or marred surfaces. Clean finished walls with Custom Masonry Cleaner by PROSOCO. Manufacturer’s instructions should be strictly followed for cleaning including a complete and thorough rinse. Permanent damage to the block could result if the exact instructions are not adhered to.
Note: Consult NCMA TEK NOTES regarding proper installation techniques for concrete masonry.