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2 BEFORE INSTALLATION
Package Components:
• Foundation Base
• Cast Aluminum Lid
• Lid Bolts (4)
Preparation
1. Prepare the site with substrate dug out to
accommodate a hand tamper 10 in. (254 mm)
oversized or vibrating plate 24 in. (610 mm)
oversized on all sides of the foundation.
The foundation is 15 in. (381 mm) in diameter.
The foundation (Height = 25 in.) requires a
minimum gravel base of 6 in., making the minimum
dig depth 31 in. (25 in. + 6 in.). A deeper gravel
base is required for frost lines over 25 in. When the
frost line exceeds 25 in., add 6 in. to the frost line to
determine the proper dig depth.
EXAMPLE: Frost Line 32 in. + 6 in. = 38 in.
dig depth. Dig to the appropriate depth for your
application (based on the frost line) and backfill with
compacted limestone gravel until only 25 in. (the
height of the foundation) remains.
In addition to backfilling with gravel to reach the
correct depth, make sure the foundation has a
minimum of 11 in. (279 mm) of gravel around its
sides. See drawing.
NOTE: Compact the layers of gravel every
3 in. to 6 in. (76 mm to 152 mm).
Frost Lines 0-25 in.
Total Dig Depth
31 in. (787 mm)
Tools Required:
• Backhoe or shovel(s)
• M10 Allen Wrench
• Assorted drill bits
• Metal cutting hole saw with arbor for conduit pass
through
Gravel Base Depth
6 in. (152 mm)
2
Foundation Height
25 in. (635 mm)
Total Dig Depth
Gravel Base Depth is
determined by Frost
Line. (See tables below.)
Frost Lines 26 in. and Higher
Total Dig Depth
Frost Line + 6 in.
Total Dig Depth = 25 in. (635 mm)
(152 mm)
Gravel Base Depth
(Foundation Height)
Ground
level
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