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Installation Manual
Direct: 763.476.6866 • National: 800.422.2537 • www.SeeClearfield.com • techsupport@clfd.net
Manual 009246 REV J - Feb 2020
Vault Installation
These instructions provide general information useful for vault installation. This guide cannot anticipate all situations that
could develop in the field. Rather, it represents information applicable to common installation conditions.
Site Preparation:
Ensure that national/local electrical and building codes, as well as OSHA and company safety work rules, are observed and
provisions made for street flags, barricades, and cones. Secure permits as required by the city and company.
WARNING: Buried Telecommunications Cables - Call Before Digging
Excavation:
Plan excavation approximately twelve to sixteen inches (12” - 16”) longer and wider than the actual dimensions of the vault
to be installed. Similarly, excavate six to eight inches (6” - 8”) deeper than the overall dimensions of the vault with the cover
in place.
Note:
Vault size is generally defined by the approximate cover dimensions. The vault actual measurements will differ. The
dimensions above for determining the size of the excavation provide sufficient volume for accommodating the maximum
recommended select backfill. The volume of excavation would be reduced if a lesser volume of backfill material were
chosen. Excavate the hole to appropriate dimensions with a mechanical excavator or hand dig as appropriate.
Confirm the
excavation floor is level.
Installation:
Clearfield highly recommends the the installation of a vapor barrier beneath the crushed rock floor of the excavated area. It
is recommended to use a minimum of three to six (3” - 6”) inches of crushed rock to prevent subsidence over time. Gravel is
the recommended material because of its drainage characteristics. The compacted material should be leveled so the top of
the vault is flush to the grade.
Note:
Base material shall be crushed rock 3/4” and smaller, and not “river rock” or “round stone.” Desired compaction and
equivalent resistance to lateral loading will not be achieved with round stone. The rock should be free of soil and organic
material.
Install the vault with the cover and support beams in place.
Backfill the extra excavated material into the gaps around
the vault and compact by hand.