What To Put Under An Above Ground Pool: Best Options and Tips

What To Put Under Above Ground Pool

Choosing the right base for an above-ground pool helps protect the liner, support the pool structure, improve swimmer comfort, and reduce future maintenance issues. The best option depends on your pool type, yard conditions, budget, and how permanent you want the installation to be.

This guide compares common above-ground pool base options, including sand, foam padding, concrete pads, and pre-cut pool pads, along with tips for preparing a level and durable pool foundation.

Quick Answer: What Should You Put Under an Above Ground Pool?

For most above-ground pools, the best base is a level, compacted surface with either foam padding, a pre-cut pool pad, or a properly installed sand base. Foam padding and pre-cut pool pads offer better liner protection and comfort, while sand is a more budget-friendly option. Avoid placing an above-ground pool directly on grass, rocks, roots, or uneven soil.

Importance of a Level Surface for Above Ground Pools

A level surface is essential for the stability and safety of an above-ground pool. An uneven surface can lead to structural damage, uneven water distribution, and increased wear on the pool liner. Over time, these issues can compromise the pool’s integrity, leading to costly repairs or even complete pool failure.

An uneven base can also create an uncomfortable swimming experience, as water may gather more heavily on one side of the pool. By ensuring your pool sits on a level surface, you help prevent shifting, liner stress, and long-term structural issues.

Explore our Above Ground Pool Installation Guide.

Best Above Ground Pool Bases

Sand

Sand is a traditional and widely used material for creating a base under an above-ground pool. It is affordable, easy to level, and readily available. Sand provides cushioning, which helps protect the pool liner from damage and creates a smoother surface for swimmers. Sand can also support drainage when installed correctly and paired with proper grading around the pool area.

Pros:

• Affordable and easy to find
• Simple to level for a smooth surface
• Provides cushioning under the pool liner

Cons:

• Can shift over time, leading to uneven areas
• Requires periodic maintenance to maintain an even surface
• May wash out if drainage around the pool is not handled properly

Foam Padding

Foam padding is a premium option for above-ground pool bases because it offers strong cushioning and protection against punctures. This material creates a smoother, more comfortable surface under the liner and can help reduce the risk of damage from small imperfections in the ground below.

Foam padding can also provide better insulation than sand, helping the pool water retain heat more effectively.

Pros:

• Excellent cushioning for improved comfort
• Strong protection against punctures and liner damage
• Provides insulation, helping pool water stay warmer

Cons:

• More expensive than sand.
• Higher initial cost, though it may offer better long-term protection

Concrete Pads

Concrete pads are a solid and permanent option for some above-ground pool installations. A concrete base provides excellent durability and stability, helping the pool remain level and secure over time. Once installed, it generally requires very little maintenance.

However, concrete is not the right choice for every above-ground pool. Always check the pool manufacturer’s installation requirements before choosing a concrete pad, especially for oval pools or pool designs with specific structural support needs.

Pros:

• Extremely durable and stable
• Long-lasting with little to no maintenance required
• Ideal for some permanent installations on hard surfaces

Cons:

• More expensive and labor-intensive to install
• Installation can be time-consuming
• Not compatible with every pool type or support structure

Pre-cut Pool Pads

Pre-cut pool pads are a convenient and easy-to-install option, typically made from durable, puncture-resistant materials. These pads are designed to fit specific pool sizes, helping provide a clean fit and added protection between the ground and pool liner.

Although pre-cut pool pads usually come with a higher initial cost than basic sand, they offer strong liner protection and require minimal maintenance, making them a helpful option for pool owners who want a simpler installation process.

Pros:

• Designed to fit specific pool sizes
• Helps protect the liner from punctures and abrasion
• Easier to install than some custom base materials

Cons:

• Higher upfront cost than basic sand
• Still requires a properly leveled and prepared surface

Above Ground Pool Base Comparison

Each above-ground pool base option has different strengths depending on your budget, yard conditions, pool type, and comfort preferences. Use the table below to compare the most common options before choosing the best base for your installation.

What Not to Put Under an Above Ground Pool

Some materials may seem convenient, but they do not provide enough stability or liner protection on their own. Avoid installing an above-ground pool directly on grass, rocks, roots, sticks, or uneven soil. These can create pressure points under the liner and may cause the pool to shift or settle unevenly.

A tarp can be used as an extra layer, but it should not be relied on as the main base material. It does not provide the same cushioning, leveling support, or puncture protection as foam padding, a pre-cut pool pad, or a properly prepared sand base.

Tips on Above Ground Pool Base Preparation

Before installing your above-ground pool, it’s important to prepare the site properly. A strong base starts with a clean, level, and stable area.

1. Choose a flat area with proper drainage.
   Select a spot where water can move away from the pool instead of collecting around the base.

2. Clear the installation area.
   Remove grass, rocks, roots, sticks, and debris. These can damage the liner or create an uneven surface.

3. Level the ground carefully.
   Use a laser level, spirit level, or stakes and string to check the area. For best results, level by removing high spots rather than filling low spots with loose soil.

4. Compact the soil.
   A compacted surface helps reduce settling after the pool is filled with water.

5. Install the selected base material.
   Add your sand, foam padding, pre-cut pool pad, or approved base material according to your pool’s installation guidelines.

6. Recheck the level before filling the pool.
   Once water is added, the pool becomes much harder to adjust. Confirm the base is smooth and level before filling.

Impact on Above Ground Pool Longevity and Swimmer Comfort

The choice of base material can significantly impact both the lifespan of your above-ground pool and the comfort of swimmers.

• Longevity: A well-prepared base supports the pool structure, reducing wear and tear on the liner and frame. Materials like foam padding, pre-cut pool pads, and compatible concrete pads can help protect the pool from avoidable damage.

• Swimmer Comfort: Smooth and cushioned base materials, such as foam padding, create a more comfortable surface underfoot. This added cushioning can make the pool feel better for swimmers while also helping protect the liner from rough or uneven ground below.

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What To Put Under An Above Ground Pool - Frequently Asked Questions

What is the best material to put under an above ground pool? 

• The best material depends on your budget, pool type, and yard conditions. Sand is a common budget-friendly option, while foam padding and pre-cut pool pads provide better liner protection, cushioning, and comfort.

Can I put an above ground pool directly on grass? 

• It's not recommended to place an above-ground pool directly on grass. Grass, roots, and uneven soil can cause the pool to settle unevenly and may damage the liner. Removing the grass and preparing a proper base is the safer option.

How thick should the sand base be for an above ground pool? 

• A sand base is commonly installed at about 2 to 3 inches thick to provide cushioning and support. Always follow the pool manufacturer’s instructions, as base requirements can vary by pool model.

Are foam pads better than sand for an above ground pool base? 

• Foam pads are often better for comfort, insulation, and liner protection. Sand is more affordable, but it can shift over time. Foam padding usually costs more upfront, but it can offer stronger long-term protection.

Can I use a tarp under my above ground pool? 

• A tarp can be used as an added layer, but it should not be the only material under the pool. Tarps do not provide the same cushioning, stability, or puncture protection as foam pads, pre-cut pool pads, or a properly prepared sand base.

Do I need a pool pad under an above ground pool? 

• A pool pad is not always required, but it can help protect the liner from punctures, abrasion, and rough ground conditions. It is especially helpful if you want a smoother surface and added peace of mind.

How do I ensure proper drainage around my above-ground pool? 

• Proper drainage starts with grading the area so water flows away from the pool base. In some cases, adding a layer of gravel around or beneath the base area may help reduce water buildup and erosion.