Installation Instructions

Step 2 - Leveling Pad Installation
Place a minimum of 6" of compacted base material and
compact to 95% Standard Proctor density. Verify that
the base is level with a transit or hand level. Be aware
that the base material (commonly referred to as road
base or base aggregate) will vary from region to region.
The base material should consist of crushed material:
¾" crushed concrete with fines or ¾" crushed rock or
limestone with fines. Your material must be angular,
nothing round. Round rock will act like ball bearings and
roll when under pressure, causing the wall to bow or
collapse.
Step 3 - Base Course Installation
The base course will consist of one layer of block. Base
units will have the rear lip removed before placing on
the leveling pad. Use a string line behind the tail of the
block for alignment on straight wall applications. All
blocks should rest firmly on the pad and be centered
to allow 6" of base material in front and 6" behind the
base block. Level each block, side-to-side, front-to-back,
and across three full blocks with a hand level. A rubber
mallet may be used to level and align the blocks.
Step 4 - Core and Drainage Fill
Place ¾" to 1" clean aggregate (crushed rock) within
the cores and a minimum of 12" behind the blocks. This
creates a drainage zone and the stone columns that help
to unify and maximize the performance of the wall. In
addition, sock wrapped perforated drainpipe can be
installed at the desired level behind the wall
(usually behind the first block above grade). The
perforated drainpipe should have adequate slope to
drain water in the right direction towards each drainpipe
outlet. Drainpipe outlets are usually installed every 30 to
50 ft.
CRESTONE
®
BEVELED