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' <br /> psi), compressibie up to 35 percent, of width and thickness indicated, formulated from the foIlowing <br /> � material: <br /> I. Neoprene. <br /> 2. Urethane. <br /> ' 3. Polyvinyi chlonide. <br /> B. Preformed Control Joint Gaskets: Material as indicated below, designed to frt standard <br /> ' sash block and to maintain lateral stability in rinasonry wall; size and configuration as <br /> indicated. <br /> 1. Styrene-Butadiene Rubber Compound: ASTM D 2000,Designation 2AA-805. <br /> � 2. Polyvinyl Chloride: ASTM D 2287,Generai Parpose Grade,Type PVC-65406. <br /> ' 2.8 MORTAR AND GR4UT MIXES <br /> A. Generai: Do not add admixtures including coloring pigmsnts, air-entraining agents, <br /> accelerators,retarders,water repellent agents,antifreeze coznpounds,or other admixtures, , <br /> � unless otherwise indicated. <br /> l. Do not use calcium chloride in mortar or grout. <br /> � B. Mortar for Unit Masonry: Comply with ASTM C 270,Proportion Specification,for types <br /> of mortar indicated below: <br /> ' C. Mortar for Unit Masonry: Comply with ASTM C 270, Properiy Specification for job- <br /> mixed mortar and ASTM C 1142 for ready-mixed mortar,of types indicated bclow: <br /> � D. Grout for Unit Masonry: Comply with ASTM C 476 and referenced unit masonry <br /> standard. <br /> PART 3-EXECUTION <br /> r3.1 EXAMINATION <br /> ' A. Examine conditions, with Installer present, for compliance with requirements for <br /> installation tolerances and other specific conditions, and other conditions affecting <br /> performance of unit masonry. <br /> � 3.2 LAYING MASONRY WALLS <br /> A. Lay out walls in advance for accura.te spacing of surface bond patterns with uniform joint <br /> � widths and for accurate locating of openings, movement-type joints, returns, and offsets. <br /> Avoid the use of less-than-half-size units at comers,jambs, and where possible at other <br /> locations. <br /> � B. Lay up watls to comply with specified construction tolerances, with covrses accurately <br /> spacea and coordinated with other construction. <br /> , C. La.y concealed masonry with all units in a wythe in running bond or bonded by Iapping <br /> not Iess than 2 inches. Bond and interlock each course of each wythe at corners. Do not <br /> use units with less than nominal4-inoh horizontal face dimensions at corners or jambs. <br /> � D. Stopping and Raswning Work: In each course, rack back 1/2-unit lengti� for ono-half <br /> running bond or 1/3-unit length for one-third running bond;do not too#h. Clean exposed <br /> surfaces of set masonry, if required},and remove loose m�so�ry units and mortar prior to <br /> ' laying fresh masonry. <br /> UNIT MA3UNRY Page 5 of 6 <br /> � <br />