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block and to maintain lateral stability in masonry wall;size and configuration as indica.ted. <br /> 1. Styrene-Butadiene Rubber Compound: ASTM D 2000,Designation 2AA-805. <br /> 2. Polyvinyl Chloride: ASTM D 2287,General Purpose Grade, Type PVC-65406. <br /> 2.8 MORTAR AND GROUT NIII�S <br /> A. General: Do not add admixtures including coloring pigments,air-entraining agents, <br /> accelerators,retarders,water repellent agents,antifreeze compounds,or other admixtures,unless otherwise <br /> indicated. <br /> 1. Do not use calcium chloride in mortar or grout. <br /> B. Mortar for Unit Masonry: Comply with ASTM C 270,Proportion Specification,for types of <br /> mortar indicated below: <br /> C. Mortar for Unit Masonry: Comply with ASTM C 270,Property Specification for job-mixed <br /> mortar and ASTM C 1142 for ready-mixed mortar,of types indicated below: <br /> D. Grout for Unit Masonry: Comply with ASTM C 476 and referenced unit masonry standard. <br /> PART 3-EXECUTION <br /> 3.1 EXA11�iATION <br /> A. Examine conditions,with Installer present,for compliance with requirements for installation <br /> tolerances and other specific conditions,and other conditions affecting performance of unit masonry. <br /> 3.2 LAYING MASONRY WALLS <br /> A. Lay out walls in advance for accurate spacing of surface bond patterns with uniform joint <br /> widths and for accurate locating of openings,movement-type joints,returns,and offsets. Avoid the use of <br /> less-than-half-size units at comers,jambs,and where possible at other locations. <br /> B. Lay up wa11s to comply with specified construction tolerances,with courses accurately spaced <br /> and coordinated with other construction. <br /> C. Lay concealed masonry with all units in a wythe in ninning bond or bonded by lapping not <br /> ' less than 2 inches. Bond and interlock each course of each wythe at comers. Do not use units with less than <br /> nominal 4-inch horizontal face dimensions at comers or jambs. <br /> D. Stopping and Resuming Work: In each course,rack back 1/2-unit length for one-half running <br /> bond or 1/3-unit length for one-third running bond;do not tooth. Clean exposed swfaces of set masonry,if <br /> required),and remove loose masonry units and mortar prior to laying fresh masonry. <br /> E. Support masonry solidly with mortar,unless otherwise indicated. <br /> � 3.3 MORTAR BEDDING AND JOINTING <br /> A. Lay hollow concrete masonry units as follows: <br /> 1. With full mortar coverage on horizontal and vertical face shells. <br /> 2. Bed webs in mortar in starting course on footings and in all courses of piers,columns,and <br /> pilasters,and where adjacent to cells or cavities to be filled with grout. <br /> 3. For starting cowse on footings where cells are not grouted, spread out full mortar bed <br /> including areas under cells. <br /> Page 5 of 6 <br />