Masonry Magazine September 1979 Page. 22
4.
Minimum thickness of mortar or grout between brick and reinforcement: 1/4 in. (6.4 mm), except:
a. 1/4-in. (6.4 mm) bars may be laid in 1/2-in. (12.7 mm) horizontal mortar joints.
b. No. 6 gage or smaller wires may be laid in 3/8-in. (9.5 mm) mortar joints.
5.
Minimum width of collar joints containing both horizontal and vertical reinforcement: 1/2 in. (12.7 mm) larger than sum of diameters of horizontal and vertical reinforcement.
6.
Splice reinforcement or attach reinforcement to dowels by placing in contact and wiring.
7.
Do not splice reinforcement at points other than shown on drawings, unless approved by the structural engineer.
8.
Shape and dimension reinforcement as shown on drawings:
a. Cold bend all bars.
b. Do not straighten or repair in a manner that will injure material.
c. Do not use bars with kinks or bends not shown on drawings.
d. Reinforcement can be heated when entire operation is approved by structural engineer.
3.05 GROUTING:
# A. Low-Lift Grouting:
1. Keep grout core clean from mortar and drippings.
2. Grout spaces less than 2 in. (51 mm) in width at intervals of not more than 24 in. (610 mm) in lifts of 6 to 8 in. (152 to 203 mm) as the wall is built.
3. In grout spaces more than 2 brick in thickness:
a. Place or float brick in grout.
b. Minimum grout between brick: 3/8 in. (9.5 mm).
4. Agitate or puddle grout during and after placement to insure complete filling.
5. Stop grout 1 1/2 in. (38 mm) below top of masonry:
a. If grouting is stopped for 1 hr. or more.
b. Except when completing grouting of finished wall.
6. If brick headers are used for ties in low-lift grouting space:
a. Maximum: 8% of wall area.
# B. High-Lift Grouting:
1. For running bond, provide one metal tie for each 3 sq. ft. (0.28 m²) of wall with maximum spacing:
a. Vertically: 16 in. (406 mm).
b. Horizontally: 24 in. (610 mm).
2. For stack bond, provide one metal tie for each 2 sq. ft. (0.19 m²) of wall with maximum spacing:
a. Vertically: 12 in. (305 mm).
b. Horizontally: 24 in. (610 mm).
3. Keep grout core clean from mortar and droppings.
4. Provide cleanout holes by omitting every other brick in bottom course on one side of wall.
5. Prior to closing cleanout holes and pouring grout, use high-pressure jet stream of water or high-pressure air to remove excess mortar from grout space and to clean reinforcement.
6. Do not plug cleanout holes until condition of area to be grouted has been approved.
7. Before pouring grout, plug cleanout holes with masonry units and brace against grout pressure.
8. Grout spaces 2 in. (51 mm) or more in width in lifts not exceeding 4 ft. (1.2 m) at intervals:
a. Coarse grout: Not more than 48 times the least clear dimension of grout space.
3. 05.A.6 Using headers for tying wythes is not recommended; however, if selected, construction should conform to the requirements of this section.