Page 281 - Masonry and Concrete

Paving

280 CHAPTER EIGHT

lines in Figure 8-2. If the house is on a hill, the driveway should not
3
slope more than 14%—a rise or fall of 1- 4 in. per ft. of length—or a
car’s undercarriage and back bumper will scrape the ground at the top
and bottom of the slope (Figure 8-3). If there is no slope to or from the
street, flat driveways should be crowned or cross-sloped a minimum
1
of 4 in. per foot to drain water off the surface (Figure 8-4). The top of
a driveway slab should be 1–2 in. below the carport or garage slab and
1–2 in. above the street surface. Concrete driveways should be 4–6 in.

10'-0"
MIN.
DRIVEWAY

1/2" ISOLATION EXISTING
JOINT EACH SIDE SIDEWALK

DRIVEWAY APRON

3' TO 5'
1/2" RADIUS
CURB ISOLATION
JOINT
GUTTER LINE
16' TO 20' MIN.
CURB OPENING
PLAN

ISOLATION
EXISTING SIDEWALK JOINT EACH
GUTTER CURB BEYOND SIDE

4 – 6" 4 – 6"
8 – 12"
REINFORCING MESH
6 – 8 FEET
SECTION
FIGURE 8-1
Driveway design guidelines. (from Portland Cement Association, The Homeowner’s Guide to Building With Con-
crete, Brick and Stone, PCA, Skokie, Illinois).

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