Page 306 - Masonry and Concrete

Paving

305
PAVING

Use a string line to maintain the cours-
ing in straight lines. Wrap nylon line or PERIMETER
EXPANSION
string around a brick, stretch the line JOINT NEOPRENE
across the working area, and wrap the SPONGE
FILLER
other end around another brick (Figure 8-
28). On small projects, lay the pavers in
complete courses working across the slab.
On larger projects, lay the pavers in
smaller, rectangular sections. To allow for
normal expansion and contraction, rigid FIGURE 8-27
brick paving should be isolated from
fixed objects and other construction such Perimeter expansion joint.
as curbs, planters, and concrete paving. A
soft expansion joint filler should be placed between the two ele-
ments to allow them to expand and contract independently. If you
use either of the wet mortar methods of setting the pavers, you will
need to tool the joint surfaces. The joints are ready for tooling when
the mortar is “thumbprint” hard. That is, when you can press your
thumb against the mortar and leave a print impression without mor-
tar sticking to your thumb. Use a rounded jointer to produce a con-
cave shaped joint.

STRING
LINE

SCREEDED
SAND BED
FIGURE 8-28

String lines help keep paving units level.

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