Swimming Pool Soil Stabilization

Swimming pools benefit greatly from chemical soil stabilization injections, especially when both the pool floor and the surrounding decking areas are treated. Stabilizing the soil beneath and around a pool helps reduce the movement caused by expansive clay soils, which are common throughout Texas.

While pool injections are typically more labor-intensive than standard foundation injections, the overall project size is much smaller. Because of this, even though the cost per square foot may be higher, the total investment for stabilizing a swimming pool area is usually quite reasonable.

When Pool Injections Are Performed

For new pool construction, the pool floor is typically injected after excavation is completed but before rebar or plumbing is installed. Atlas Soil Stabilization does not perform injections prior to excavation.

Injecting the soil before rebar installation helps prevent the rebar from becoming buried in softened soil during the injection process. However, if rebar and plumbing have already been installed, injections can still be performed as long as the gunite has not yet been applied.

It is important to note that pool walls are not injected laterally (sideways). If soil stabilization is needed around the pool deck area, injections are usually scheduled after the gunite has cured for 7–10 days. This work typically takes place after tile and coping are installed but before the deck concrete is poured.

Once decking concrete has been installed, injections can still be performed, but doing so would require drilling holes through the concrete, which is generally avoided when possible.

What to Expect During Pool Floor Injection

The chemical injection process requires a significant amount of water to properly treat the soil. As a result, the pool floor may temporarily become soft or muddy during the process.

To prevent soil instability or collapse along the sides of the excavation, most of the excess water is pumped out before the crew leaves the job site.

Pool Perimeter and Decking Injections

Engineers often recommend perimeter injections around the pool deck, similar to the 5-foot perimeter treatment commonly used for building foundations.

This perimeter treatment helps stabilize the soil around the pool and reduces the likelihood that expansive clay soils will pull moisture toward the pool structure. Untreated clay soils can draw water from several feet away, which may cause swelling and ground movement.

Stabilizing the soil around the pool helps create a protective zone that limits the impact of these “active soils.”

The Importance of Proper Drainage

While soil stabilization is extremely effective, proper grading and drainage around the pool are equally important.

The ground surrounding the pool should always:

  • Slope away from the pool structure

  • Be covered with hardscape such as concrete or pavers with proper drainage

  • Include surface drains or grading that carries water away from the pool

Chemical soil injections stabilize the soil but cannot control underground water flow. If water is allowed to collect near the pool, untreated soils may swell and create movement.

For long-term performance, soil stabilization and proper drainage must work together.

If you have questions about pool soil stabilization, expansive clay soils, or preventing costly structural movement, contact Atlas Soil Stabilization to schedule a Free Soil Evaluation Inspection.

 

 

 Please see the Moisture maintenance Recommendations.