Page 300 - Masonry and Concrete

Paving

299
PAVING

USE STRING WITH
LINE LEVEL TO
MARK LEVEL ELEV.

1 /4" PER FT.

MEASURE AND SET
STRING TO ACHIEVE
DRAINAGE SLOPE

FIGURE 8-23

Patio slope.

in. 3 in. Mark three in. down on the stake at the outer edge, and set
the string for the side forms at this mark (Figure 8-23). The bottom of
the excavation should remain level, with the concrete thickness varied
to achieve drainage slope. If the ground slopes sharply, the forms may
have to be deeper at the outer edge (Figure 8-24).

8.3 Masonry Paving

Clay, concrete, and stone masonry can all be used for residential side-
walk, patio, and driveway paving. There are many different types of
paving units and several different methods of installation. Masonry
paving systems essentially fall into two different categories and are
classified as rigid or flexible, depending on whether they are laid with
or without mortar. Rigid masonry paving is
laid in a mortar setting bed with mortar
joints between the units. Flexible masonry TOP OF
CONCRETE
paving or mortarless paving is laid on a
sand bed with sanded joints and contains EXISTING
GRADE
no mortar underneath or between the
units. Either type of paving can be
TRENCH
designed to support pedestrian or vehicu- FOR FORMS
lar traffic, and selection of the type of FIGURE 8-24
paving system to be used will depend to a
large extent on the desired aesthetic effect. Concrete forms at raised patio edge.

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