Understanding the Causes of Sinking Pavers on Your Pool Deck

Frederick M. Hueston  StoneForensics.com

A well-maintained and aesthetically pleasing pool deck adds value and charm to any outdoor space. However, the occurrence of sinking pavers can mar its appearance and compromise safety. Sinking pavers are not only unsightly but can also indicate underlying issues that need attention. Lets delve into the common causes of sinking pavers on pool decks and explore potential solutions to rectify the problem.

1. Poor Base Preparation

One of the primary culprits behind sinking pavers is inadequate base preparation during the initial installation process. If the foundation beneath the pavers is not properly compacted or lacks the appropriate materials, sinking can occur over time. An unstable base cannot support the weight of the pavers, leading to shifts and depressions.

Solution: To rectify this issue, it may be necessary to excavate the affected area and rebuild the base. This process involves adding layers of compacted gravel, sand, and other materials to create a stable foundation that can withstand the weight of the pavers.

2. Erosion and Poor Drainage

Improper drainage and erosion can contribute to sinking pavers on a pool deck. Water runoff from rain or pool splashes can erode the soil beneath the pavers, creating voids that result in sinking.

Solution: Address drainage issues by regrading the landscape or installing proper drainage systems, such as surface drains or French drains. Redirecting water away from the pool deck area can prevent erosion and the subsequent sinking of pavers.

3. Natural Settlement

Over time, soil naturally settles due to a variety of factors. In cases where the pool deck was not adequately compacted during construction, the settling can be more pronounced, leading to sinking pavers.

Solution: Minor settling might be corrected by adding sand and re-leveling the pavers. However, significant settling may require lifting the pavers, improving the base, and then reinstalling them at the appropriate level.

4. Tree Roots

The presence of nearby trees with spreading root systems can contribute to sinking pavers. As tree roots grow and expand, they can push against the soil beneath the pavers, causing them to lift or sink.

Solution: Address root-related sinking by trimming or removing the problematic tree roots. Installing root barriers can also prevent further root intrusion into the paved area.

5. Structural Issues

Sinking pavers might also be indicative of more serious structural problems with the pool deck or its foundation. These issues can result from poor construction practices, inadequate materials, or wear and tear over time.

Solution: To tackle structural issues, it’s advisable to consult with a qualified engineer or a reputable pool deck contractor. They can assess the situation, identify the root cause, and recommend appropriate remedies to ensure the long-term stability and safety of the pool deck.

6. Incorrect Installation Techniques

Faulty installation techniques, such as improper use of adhesive or failure to interlock pavers correctly, can lead to sinking over time.

Solution: If sinking is due to poor installation, the affected pavers should be removed, the base inspected and improved, and the pavers reinstalled following proper installation guidelines.

Sinking pavers on a pool deck are not just a cosmetic issue; they often signify deeper problems that need to be addressed promptly to ensure the safety, integrity, and aesthetic appeal of the pool area. By identifying the root causes and implementing appropriate solutions, homeowners can effectively resolve the issue of sinking pavers and enjoy a durable and beautiful pool deck for years to come. If unsure about the cause or the required actions, seeking advice from professionals in the field is highly recommended to prevent further complications.