What to Put Under an Above Ground Pool
If you’re planning to install an above ground swimming pool, one of the most important questions is what to put under it.
It might not seem like a big deal, but the material you choose for the area beneath your pool affects how long it lasts, how comfortable it is, and how many issues you might face later. The right base can prevent liner damage, assist with leveling, and save you money on repairs. The wrong base can lead to problems.
Let’s break down the best options, what to avoid, and what makes the most sense, especially for homeowners in Arizona.
Why the Ground Under an Above Ground Pool Matters
Above ground pools sit directly on whatever surface you prepare for them. That means the ground underneath is responsible for supporting thousands of pounds of water, people, and movement.
A proper base helps:
Prevent punctures or tears in the pool liner
Keep the pool level and stable
Improve comfort underfoot
Extend the life of the pool
Skipping proper ground prep might save time upfront, but it usually leads to problems later.
What to Put Under an Above Ground Swimming Pool
There isn’t one “perfect” base for every backyard. The best choice depends on your soil, budget, and whether the pool is permanent or temporary.
Sand (The Most Common Option)
Sand is one of the most popular materials used under above ground pools.
It’s affordable, easy to work with, and creates a smooth surface that feels comfortable underfoot. When leveled and compacted properly, sand can provide a solid base for many above ground pools.
However, sand has its downsides. It can shift over time, especially after heavy rain or frequent use, and it requires careful leveling to avoid low spots. In Arizona, sand can dry out quickly and may need extra compaction.
Sand works best when installed correctly and paired with a liner pad for additional protection.
Crushed Stone or Crusher Fines
Crushed stone or crusher fines offer a more stable option than sand.
These materials compact tightly and drain well, which helps prevent shifting and pooling water underneath the pool. They’re especially useful in areas with uneven soil or poor drainage.
The tradeoff is comfort. Crushed stone needs a liner pad on top to prevent sharp edges from damaging the pool liner. It also costs more than sand and usually requires more labor to install correctly.
Foam Pool Pads or Liner Pads
Foam pool pads aren’t a base on their own, but they’re a great addition on top of sand or compacted soil.
They add a layer of protection between the pool liner and the ground, reduce the risk of punctures, and make standing in the pool more comfortable.
For rocky or hard Arizona soil, foam pads are often worth the extra cost.
Concrete or Pavers (Use With Caution)
Some homeowners choose to install above ground pools on concrete slabs or pavers.
While this can work, it has to be done correctly. The surface must be perfectly level and smooth. Any imperfections can cause liner wear or structural stress over time.
Concrete is also permanent, which may be an issue for HOAs or homeowners who want flexibility. It’s usually better suited for long-term installations rather than seasonal setups.
What NOT to Put Under an Above Ground Pool
Certain surfaces may seem convenient, but they often cause problems.
Grass or bare dirt can shift, rot, or create uneven spots. Gravel and sharp rock can puncture liners. Carpet, wood, or decking can trap moisture and break down over time.
Uneven or sloped ground is one of the biggest mistakes. Even small slopes can cause structural stress once the pool is filled.
How to Prepare the Ground Before Installing an Above Ground Pool
Proper preparation is just as important as the materials you use.
The ground needs to be leveled carefully, without guessing. You should think about drainage to prevent water from collecting under the pool. In Arizona, it is particularly crucial to compact hard soil or caliche to stop shifting.
Taking the time to prepare correctly helps avoid costly problems later.
Does What You Put Under an Above Ground Pool Affect Cost?
Yes, both in the short term and long term.
Sand is cheaper at first but might need more maintenance. Crushed stone costs more upfront but can lower shifting and repair needs. Foam pads increase the cost but protect the liner and offer better comfort.
In many cases, spending a bit more on proper preparation saves money over the pool’s lifespan.
Can You Install an Above Ground Pool Without Permanent Ground Prep?
Yes, and this is where many homeowners start looking into alternatives.
Temporary setups and professionally managed rentals allow families to enjoy a pool without digging, permanent bases, or long-term commitment. These options are perfect for HOAs, limited spaces, or anyone who wants flexibility without the burden of ownership.
Final Thoughts
Knowing what to put under an above ground pool is just as vital as choosing the pool itself. The right base improves safety, comfort, and durability, while the wrong one can lead to ongoing problems.
Before you install, think about how long you want the pool, how permanent you want the setup to be, and how much work you are willing to put in.
