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Grout shall be a plastic mix suitable for pumping without segregation of the constituents and shall be mixed thoroughly. Grout shall be placed by pumping or by an approved alternate method and shall be placed before any initial set occurs and not more than 11/2 hours after water has been added. Grout shall be consolidated by puddling or mechanical vibrating during placing and reconsolidated after excess moisture has been absorbed but before plasticity is lost. Grout shall not be pumped through aluminum pipes.
Maximum pour heights and the minimum dimensions of spaces provided for grout placement shall conform to Table R606.3.5.1. Grout shall be poured in lifts with a maximum height of 8 feet (2438 mm). Where a total grout pour exceeds 8 feet (2438 mm) in height, the grout shall be placed in lifts not exceeding 64 inches (1626 mm) and special inspection during grouting shall be required. If the work is stopped for 1 hour or longer, the horizontal construction joints shall be formed by stopping all tiers at the same elevation and with the grout 1 inch (25 mm) below the top.

TABLE R606.3.5.1
GROUT SPACE DIMENSIONS AND POUR HEIGHTS
GROUT TYPE GROUT POUR MAXIMUM HEIGHT (feet) MINIMUM WIDTH OF GROUT SPACESa, b (inches) MINIMUM GROUTb, c SPACE DIMENSIONS FOR GROUTING CELLS OF HOLLOW UNITS (inches × inches)
Fine 1 0.75 1.5 × 2
5 2 2 × 3
12 2.5 2.5 × 3
24 3 3 × 3
Coarse 1 1.5 1.5 × 3
5 2 2.5 × 3
12 2.5 3 × 3
24 3 3 × 4
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
  1. For grouting between masonry wythes.
  2. Grout space dimension is the clear dimension between any masonry protrusion and shall be increased by the horizontal projection of the diameters of the horizontal bars within the cross section of the grout space.
  3. Area of vertical reinforcement shall not exceed 6 percent of the area of the grout space.

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