Page 330 - Masonry and Concrete

Masonry Garden Walls

329
MASONRY GARDEN WALLS

MORTARED COLLAR JOINT

TWO WYTHES OF
4 8 16 SPLIT-
FACED BLOCK

JOINT REINFORCEMENT
TIES WYTHES TOGETHER
FIGURE 9-18
Double-wythe CMU wall.

the actual width of the units or the wall so that it is protected by a good
cover of mortar on both faces of the wall. Joint reinforcement spacing
affects recommended control joints spacing. The table in Figure 9-19
shows that control joints must be spaced closer together as the amount of
joint reinforcment decreases and may be spaced further apart as the
amount of joint reinforcement increases. Joint reinforcement should stop
on either side of control joints to allow shrinkage cracking to occur at the
joints. The grout fill or the interlocking shape of a control joint block
links the two adjacent sections of wall together so that they move
together when lateral loads are applied (Figure 9-20).

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