EPS Geofoam has become an increasingly popular backfill material for fiberglass and vinyl liner swimming pools.
The Problem with Traditional Pool Backfill
Sand or gravel backfill can wash away over time due to groundwater movement, creating voids around the pool shell that lead to cracking and structural distortion.
How EPS Geofoam Solves These Problems
EPS Geofoam provides stable, permanent support that does not wash away, settle, or migrate. Its closed-cell structure means it does not absorb significant water.
Which Grade to Use
For pool backfill applications, EPS 12 or EPS 15 is typically sufficient. EPS 19 may be specified in areas with heavy vehicle access near the pool.
Installation Process
Blocks are cut and fitted around the pool shell, filling the annular space between the shell and the excavation walls. No compaction equipment is needed.
Cost and Schedule Benefits
While EPS Geofoam costs more per cubic yard than sand or gravel, the total installed cost is often competitive because installation is faster and requires less labor.
Key Takeaways
- EPS Geofoam eliminates backfill settlement and void formation around pool shells
- EPS 12 or EPS 15 is typically sufficient for residential pool backfill
- No compaction equipment needed — blocks are fitted by hand around the pool shell
- Geofoam does not contribute to hydrostatic pressure buildup around the pool
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