9.20.4. Mortar Joints

9.20.4. Mortar Joints
9.20.4.1. Thickness
  1. Except as provided in Sentence (2), mortar joint thickness for burned clay brick and concrete masonry units shall be 10 mm.
  2. Permitted tolerances in head and bed joints shall be not more than ± 5 mm.
9.20.4.2. Masonry Units
  1. Hollow masonry units shall be laid with mortar applied to head and bed joints of both inner and outer face shells.
  2. Vertically aligned webs of hollow masonry units shall be laid in a full bed of mortar
    1. under the starting course,
    2. in all courses of columns, and
    3. where adjacent to cells or cavities that are to be filled with grout.
  3. Except for head joints left open for weep holes and ventilation, solid masonry units shall be laid with full head and bed joints.

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