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Excavation
- Foundation soil shall be excavated as required for footing
dimensions shown on the construction drawings.
- Excavate for the base.
- Level the excavation. A level base will insure complete
contact of each retaining wall unit with the leveling
pad material.
Base Preparation and Material
- Base materials should be to the depth and widths shown
in the construction drawing with a minimum of 24" wide
and 6" deep. For below grade placement of Classic units
or Legend units use a ratio 1" below grade for each 8"
of wall kept above grade.
- Granular inorganic material should be used for the base
pad (see Foundation Terms).
Note: do not use pea rock or rounded aggregate for base
pad material.
- Level the base material so that gaps will not develop
between any of the units.
- Base material should be compacted so as to provide a
level hard surface on which to place the first course of units.
Compaction by a mechanical plate compactor must be done
to 95% proctor.
- Check if level using a transit or a level. Use fine sand
for minor adjustments.
- Contractor may opt for using a reduced depth of base
material and substitute a 1" to 2" concrete topping.
Concrete shall be lean and unreinforced.
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