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Installation of Fiberglass Pools

See also: Categories: In Ground Pool, Fiberglass Pools


Fiberglass Pool Installation refers to the process of fiberglass composite pool shell setting into the ground. The process of installation doesn't reffer to the actual pool construction since the pool shell comes in pre-fabricated and ready to install composite unit.

Digging the hole

By using dig diagram provided by each pool manufacturer the pool installation crew will establish the proper elevation of the surface for a future installed pool, mark the ground for a dig and will excavate a hole with 6 inch over-dig on each side. The depth of the hole should be 4 inches deeper than the actual pool depth for a bottom pad.

Preparing the hole's bottom pad

The bottom of the hole must be prepared for a pool installation by using aggregates suggested by each manufacturer for their pool installations. Bottom pad must be compacted and leveled for the pool. The process of leveling the bottom pad can be tricky and might require several attempts of getting the pool shell in the ground.

Sump system construction

Before pool is in the ground the pool installer should build special sump system for possible dewatering from under the pool and for hydro pressure relief purposes. This system will help to keep the fiberglass pool from experiencing a stress from the possible water table and from the ground waters.

Pool outfitting

Under the ideal circumstances the pool shell should be outfitted with lights and plumbed while it's still sitting on the ground before installation.

Pool shell installation

Shell should be lowered into the ground with crane, larger excavation machine or articulated forklift or material loader. Once the pool shell is sitting in the ground the level must be checked with the laser instruments to assure the proper installation. According to the industry standards the shell could be out of perfect level for not more than 1/2 of an inch. Depending on the pool shell quality some perfect leveling might not be possible.

Plumbing lines

Once pool is in the hole and leveled it is ready for a plumbing connections to the pool filter equipment. The usual size of the line pipes are 1.5 to 2 inches in diameter. Usual plumbing components of the fiberglass pool are the main drains, return lines, therapeutic jets, skimmers, deck jets, cascades, waterfalls, wall jets, and water bubblers.


Simultaneously with plumbing the pool lines electrical wiring should be completed to the pool lights. Proper conduits and line securities must provide. Some pool lights (low Voltage LED lights) don’t require electrical grounding, and some will. Proper electrical grounding must be installed according to the local codes.

Backfill process

The backfill process might be very trick as of each pool brand might have its own specifics that only come with the experience installing that particular brand. The backfill is the gradual process of filling up the whole around the pool as the water progresses filling the pool. By early water fill extending the level of the backfill outside of the pool the walls could bulge in, or the other way around, by to rapid backfill without the internal pressure of the water, the walls could bulge out. The same is related to the top coping if the pool shell has been backfilled incorrectly. It is not only an esthetical issue, the improper result can create a tension in fiberglass and overtime the pool can endure a surface spider cracks or even a structural crack with leakage. In this situation the water will start leaking to under the pool creating a series danger of squashing the pool shell from inside out.

Pool structure stabilization

Once backfill has been complete the pool structure must be secured by the proper combination of the concrete and rebar. Each manufacturer suggest the proper bond beam for their pools. Pool installer must follow suggestions and install correct pool bond beam to secure the pool in ground.

Quick Facts

  • Fiberglass pool installation endure the highest upfront expense due to the high cost of fiberglass shell
  • Different manufacturers use different shell manufacturing ingredients to reinforce their pools
  • All gel coats created differently. The gel coat application methods might very as well.
  • The fiberglass installation process is the quickest among all pool types.
  • Most manufacturers of fiberglass pools offer lifetime warranties for their product

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