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Concrete Foundation Preparation
4C Pedestal Mount Outdoor Installations
NEW CONCRETE BASE:
1) Depending on climatic and soil conditions in the area of installation, optional foundation
material may be necessary as shown. Consult local building codes for recommendations.
2) Refer to Table 1 for thickness (h), width (w), and depth (d) of the concrete pad alternatives.
3) Concrete shall have a compressive strength of 3000 psi @ 28 days, contain 4% min ~ 6%
max air entrapment, and be placed with a 3.50~4.50 slump in accordance with the American
Concrete Institute (ACI) Publication 301.
4) Use wire mesh as per (Standard) or fiber reinforced concrete as per (Standard).
EXISTING CONCRETE BASE:
1) Existing concrete pad must be at least 47” wide and 4” thickness.
2) Concrete base and anchor bolts may be reused only if:
a. existing ½” diameter expansion anchor bolts are firmly embedded in the concrete and
not damaged or corroded;
b. concrete foundation is not damaged; and
c. bolt hole pattern of the new box matches the installed anchor bolts.
3) Additional considerations for using existing concrete include:
a. if concrete is only 4” thick, then option ‘ b.’ in Table 2 below cannot be used
b. any unused, existing anchor bolts must be cut flush to the level of the concrete surface
c. if concrete is damaged, replacement of foundation pad is required
