Page 339 - Masonry and Concrete

Masonry Garden Walls

338 CHAPTER NINE

VERTICAL PILASTER
REINFORCING BARS

LAP 30 BAR
DIAMETERS OR
DOWELS
FROM MINIMUM 12"
FOOTING

FIGURE 9-28

Lap footing dowels with pilaster reinforcing.

Cap the top of the grouted pilaster with a stone or precast coping,
or with a bed of smoothly troweled mortar which is sloped from the
center outward and downward to shed rain and snow. CMU screen
walls require joint reinforcement to restrain shrinkage and minimize
cracking. It should be installed in every second or third bed joint,
beginning with the second course, just as it is in a solid wall.
Screen blocks are usually laid in a stack bond to form a grid pattern.
Both head and bed joints are fully mortared, which increases the lat-
eral load resistance of the wall and allows the use of joint reinforce-
ment. Reinforced bond beam courses at the top and bottom of the wall
(see Figure 6-19) add even greater strength. The face shells and webs of
3
screen block should be at least 4 in. thick. Type S mortar should be

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