Page 286 - Masonry and Concrete

Paving

285
PAVING

imum size must allow enough room for opening a typical screen or
storm door safely (Figure 8-10).
The top of a patio slab should be at least 1 in. and preferably 2 in.
below door sills leading to the house, and about 2 in. above the adja-
1
cent ground. Patio slabs should be 4 in. thick and should be sloped 4
in. per foot to drain water away from the house. The slab should be
supported on a 2-in.-thick sand bed as described above for sidewalks.
1
To set the slope for proper drainage, calculate a 4-in.-per-foot drop
away from the house. If the patio is 12 ft. wide, for instance, the total
1
slope would be 12 4 in. 3 in. The size and exact shape of the
patio should be dictated by available space, existing landscape fea-
tures, and physical relationship to the building. Square and rectangu-
lar shapes will be easiest and most economical to form, but curved
shapes may create a more customized appearance.

8.2 Concrete Paving

The methods for installing concrete paving or flatwork, as it is some-
times called, is essentially the same for driveways, walks, and patios.

ADJUST AS NECESSARY
PROPORTIONAL TO
RISER HEIGHT
RUN
STAKE
STRING

LINE
LEVEL
RISE CHANGE IN GRADE
OR HEIGHT FROM
PORCH OR STOOP
TO GROUND
DIVIDE BY
DESIRED RISER
HEIGHT AND
ADJUST WITHIN
GUIDELINES TO
ACHIEVE TOTAL RISE
FIGURE 8-6

Figuring total rise and run for steps.

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