Page 283 - Masonry and Concrete

Paving

282 CHAPTER EIGHT

thick, with the apron thickness increased to 8–12 in. to support the
impact loads of vehicles as they turn into the drive from the street.
If the driveway slopes downhill from the street toward the garage or
carport, you will need to install a trench drain to intercept water and
channel it away so that the garage doesn’t flood when it rains.
The top of a sidewalk slab should be at least 1 in. below door sills
leading to the house and about 2 in. above the adjacent ground. Side-
walks should generally be a minimum of 3 ft. wide. A narrower 2-ft.
width could be used for a garden path or for service access, but pri-
mary entrance walks may look better at 4 ft. or even 6 ft., depending on

TOO STEEP

TOO STEEP

1 3 /4
12

MAXIMUM GRADE
14% OR 1 3 /4 FT. RISE
IN 12 FT. RUN
FIGURE 8-3
Driveway slope. (from Portland Cement Association, The Homeowner’s Guide to Building
with Concrete, Brick and Stone, PCA, Skokie, Illinois).

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