INSTALLATION | Keystone Century Wall Units
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STEP FOUR: Install drainage fill and backfill.
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| Once the pins have been installed, provide 1/2-inch 3/4-inch (10-20mm) crushed stone drainage fill behind the units to a minimum distance behind the tail of 1 foot (300mm). Fill all open spaces between units and open cavities/cores with the same drainage material. Proceed to place backfill soil in maximum 8-inch (200mm) layers and compact to 95% Standard Proctor with the appropriate compaction equipment. Note: Do not run heavy (ride-on) compaction equipment within 3 feet (1m) of back of wall. Do not usePEA GRAVEL or SAND for drainage fill. |
