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 (figure 8-21).
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, view 2).
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 ofContinue Reading