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' 20 and below Heat mix water and sand to produce mortar temperature between 40 degrees F. and 120 <br /> degrees F. Maintain temperature of mortar boards above 40 degrees F. Heat Masonry <br /> units to minimum 20 degrees F. Provide enclosure and auxiliary heat to maintain air <br /> ' temperature above 32 degrees F.for 24 hours. <br /> MEAN DAILY AIR <br /> TEMP.(Degrees F.) PROTECTION REQUIREMENTS <br /> 40-32 Protect masonry from rain or snow for 24 hours. <br /> 32-25 Completely cover masonry for 24 hours. <br /> 25-20 Completely cover masonry with insulating blankets or approved equal protection for 24 <br /> hours. <br /> 20 and below Maintain masonry temperature above 32 degrees F. for 24 hours by enclosure and <br /> approved supplementary heat. <br /> B. Protect facing material against staining; keep top of walls covered with non-staining waterproof coverings when <br /> work is not in progress. <br /> ' C. Where fresh masonry joins partially or totally set masonry, clean, roughen, lightly wet set masonry before new <br /> masonry is joined. Make necessary horizontal stop-offs by racking back masonry,do not tooth. <br /> ' D. Where units are specified to be wetted,uniformly wet units 3 to 4 hours before using. <br /> 3.04 LAYING MASONRY UNITS <br /> A. Lay masonry plumb,true to lines. Unless noted on Drawings as 'blear", all dimensions on Drawings are modular, <br /> from center to center of vertical joints and from bottom to bottom of horizontal joints. <br /> ' B. Lay hollow masonry units 4 inches or less in thickness,all solid masonry units in full beds of mortar with full head <br /> joints. <br /> ' C. Lay hollow masonry units exceeding 4 inches in thickness with divided bed,head joints. <br /> D. Avoid over-plumbing,pounding of comer,jambs after setting masonry in position. Where an adjustment must be <br /> made after mortar has started to harden,remove mortar,replace with fresh mortar. <br /> E. Lay masonry within one minute of placing mortar. <br /> ' 3.05 BONDING AND ANCHORAGE <br /> A. Anchor abutting or intersecting non-load bearing walls,partitions at vertical intervals of 2 feet with corrugated ties. <br /> ' B. Where indicated anchor walls, partitions abutting or facing against steel columns, beams with flexible anchors. <br /> Unless indicated otherwise,maximum spacing; 16 inches vertically at columns, 16 inches horizontally at beams. <br /> ' C. Anchor exterior walls,veneer facing against concrete beams,columns,walls with dovetail anchors spaced 16 inches <br /> vertically, 16 inches horizontally. <br /> ' D. Anchor exterior walls parallel to open web joists with prefabricated anchoring and reinforcing assembly with <br /> adjustable rectangular ties welded to structural steel as indicated. <br /> 04200-5 No.99132-CP2 <br />