Cut blockwork accurately and neatly with saw-cuts only. Made cut-outs sufficient for minimum clearance of equipment or item to be recessed. Cut outs, which exceed the dimensions of cover plates, escutcheons or flanges, will not be accepted. Provide properly sized lintels over all cut-outs and recesses.
Build in all equipment, boxes, panels, door frames, windows, accessories, access panels, flashing and other items as the work progresses and provide properly reinforced lintels, jambs and sills at these openings. Fill spaces around metal frames and other built-in items with mortar in lifts not to exceed 24 inches. Carefully review roofing and waterproofing systems for reglets and flashing before erecting masonry to that point. Chase or recesses are not pennitted except where indicated on Drawings. Place conduits in ungrouted cells only. Where masonry fill insulation is used in walls where cut-outs are required, plug all holes to prevent loss of insulation. Install all specified anchor bolts in grouted cells.
Step back unfinished masonry work for joining with new work. Toothing may be resorted to only when specifically approved. Before new work is started, remove all loose mortar and thoroughly clean out exposed joints.
Plumb: Maximum variation from plumb in lines and surfaces of columns, walls, expansion joints and other conspicuous lines shall not exceed W' in 20 feet.
Level: Maximum variation from level or grades for exposed lintels, sills, parapets, horizontal mortar joints and other conspicuous lines shall not exceed W' any bay or 20 feet.
Keep work dry during erection by covering with waterproof membranes at the end of each day or during any shutdown period. Overhand membranes at least 24 inches on each side of wall and securely anchor.
6 Section 04220