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In addition to the requirements of Chapter 4 of NCMA 1970, the following requirements apply to the placing of grout in engineered concrete masonry:
(a) All engineered concrete masonry shall be built to preserve the unobstructed vertical continuity of the cores to be filled with grout. Mortar “fins” protruding from joints shall be removed before placing grout.
(b) The minimum continuous clear dimensions of vertical cores shall be two by three inches. In filling vertical cores, the grout pour shall not exceed four feet in height unless cleanouts are left open at the bottom masonry course of each core to be reinforced and such cleanouts closed only after inspection of the core space and the setting of vertical reinforcement in fixed position.
(c) Grout shall be rodded or puddled during placement to insure complete filling of the core. When grouting is stopped for one hour or longer, the grout pour shall be topped one and one-half inches below the top of a masonry unit.
(d) Horizontal beams may be built of reinforced hollow masonry, using channeled units to permit horizontal reinforcement to be placed in the desired position. The top of the unfilled cores below such horizontal beams shall be covered to confine the grout fill to the beam section. No materials shall be used which destroy the bond between courses. Grouting of beams over openings shall be done in a continuous operation. All grout shall be puddled in place to insure complete filling of cores and encasement of reinforcement.
(Prior code § 71-9)