Common Causes of Cracks in Concrete Swimming Pools

Concrete pools are incredibly popular due to their highly customizable features, durability, and overall aesthetic appeal. But they come with a few potential problems. Concrete swimming pools are generally high-maintenance, and cracks developing in the structure are the biggest concerns. Here are the leading causes worth keeping in mind.

The pool is on a hill

There’s nothing anyone can do about gravity. If the concrete pool is on a hillside, eventually, the soil will shift, and cracks will start to show. So unless it’s completely unavoidable, installing a swimming pool on a hill is not advisable.

Changes in soil moisture

Prolonged or frequent changes in the soil moisture can also lead to cracks in a concrete swimming pool. If the soil is excessively wet, it swells, the pool may develop cracks. The same is true for overly dry soil. During droughts, the soil shrinks, leaving the pool unsupported. The pool may also begin to crack as a result. These issues are hard to anticipate or manage.

Changes in groundwater levels

Another common cause of cracks in a concrete pool is hydrostatic pressure. If the groundwater level significantly changes, this shift can move or tilt the pool. Even slight movements can lead to cracking. Fortunately, the hydrostatic relief plugs can successfully prevent this problem.

Improper installation

While some causes for the cracks are the force of nature, others stem from faulty installation. For instance, if the concrete wasn’t correctly laid out, there might be air pockets or hidden voids that will eventually compromise the pool’s structure.

Incorrect plumbing installation is another major problem. Piping is necessary to ensure the water flow, but it needs to be as minimal as possible. Otherwise, too many pipes on the floor or the walls can lead to cracking.

Incorrectly mixed concrete

Concrete is a mix of cement, water, sand, and coarse aggregates such as gravel or stone. Creating the perfect mixture requires skill and experience. Getting all the content ratios right is essential and the only way to avoid crumbling and cracking concrete in the future.

Not enough cure time

Concrete used for pools needs at least two weeks to cure and, depending on weather conditions, perhaps even more. If the pool company rushes the process, it can have a significantly negative impact later, even when it’s very hot outside.

Incorrect expansion joint

A concrete swimming pool requires an expansion joint which makes up for temperature contraction and expansion. However, if the joint is filled with debris or isn’t working well, it might lead to a horizontal crack on the pool.

Protect your concrete pool

Building a concrete swimming pool is a substantial investment. No one wants to worry about cracks in the floor or the wall and what could happen if they expand. The installation process is crucial, as that’s where the most significant mistakes might occur. Changes in the groundwater levels and soil are not something anyone can control, but they too can cause cracks.

Finally, remember not to build a concrete pool on a hillside unless there’s no other option.

Flawless Image Pool Service is a veteran-owned and operated residential pool maintenance team for Hillsborough County. Our Certified Pool Operators provide top-notch pool maintenance, 20 years of experience and reliable service. Call 813-536-3941 today!