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CONCRETE UNIT MASONRY <br />04 22 00 - 7 <br />3.3 INSTALLATION <br />A. Select and arrange units for exposed masonry to produce a uniform blend of colors and <br />textures. <br />1. Mix units from several pallets or cubes as they are placed. <br />B. Comply with construction tolerances in TMS 602/ACI 530.1/ASCE 6, Article 3.3F. <br />C. Construct grout spaces free of mortar dropping, debris, and any material deleterious to <br />grouting. <br />D. Lay all masonry true, level, plumb, and in accordance with the drawings. <br />E. Ensure all vertical cells to be grouted are aligned and unobstructed openings for grout are <br />provided . <br />F. Lay exposed masonry in running bond unless otherwise indicated in Project Drawings. <br />G. Lay concealed masonry in running bond unless otherwise indicated. <br />H. Brace masonry during construction to assure stability if necessary. <br />3.4 MORTAR BEDDING AND JOINTING <br />A. Place mortar in accordance with TMS 602/ACI 530.1/ASCE 6 Article 3.3 B. <br />B. Initial bed joint shall not be less than 1/4 in. or more than 3/4 in. <br />C. Lay all head and bed joints, except initial bed joints, a nominal 3/8 in. thick, unless otherwise <br />required. <br />1. Do not exceed 5/8 in thickness of bed joints. <br />D. Lay hollow units with head and bed joints filled with mortar for the thickness of the face shell. <br />E. Lay solid units with full head and bed joints. Do not fill head joints by slushing with mortar. <br />Do not furrow bed joints deep enough to produce voids. <br />F. Remove mortar protrusions extending 1/2 in. or more into cells to be grouted. <br />G. Fully mortar webs in all courses of piers, columns and pilasters, in the starting course on <br />foundations, and when necessary to confine grout. <br />H. Tool concave mortar joints on exposed walls, unless otherwise indicated, and strike to produce <br />a dense, slightly concave surface well bonded to the surface of the masonry unit. <br />I. Remove and re-lay in fresh mortar any unit that has been disturbed to the extent the initial <br />bond is broken.