Figure 8-21.-Making a control joint.
they are exposed to either the weather or to view,
caulk them as well. After the mortar is stiff, rake it
out to a depth of about 3/4-inch to make a recess for
the caulking compound.
Use a thin, flat caulking
trowel to force the compound into the joint
The location of control joints is established by the
architectural engineer and should be noted in the
plans and specifications.
Walls are differentiated into two types: load
bearing and nonload bearing. Load-bearing walls not
only separate spaces, but also provide structural
support for whatever is above them. Nonload bearing
walls function solely as partitions between spaces.
Do not join intersecting concrete block load-
bearing walls with a masonry bond, except at the
corners. Instead, terminate one wall at the face of the
second wall with a control joint. Then, tie the
intersecting walls together with Z-shaped metal tie
bars 1/4-by-1/4-by-28 inches in size, having 2-inch
right-angle bends on each end (figure 8-22, view 1).
Figure 8-22.-Tying intersecting bearing walls.
Space the tie bars no more than 4 feet apart vertically
and place pieces of metal lath under the block cores
that will contain the tie bars ends (figure 8-18, view
1). Embed the right-angle bends in the cores by
filling them with mortar or concrete (figure 8-22,
To join intersecting nonload-bearing block walls,
terminate one wall at the face of the second with a
control joint. Then, place strips of metal lath of