What To Put Under Swimming Pool

What to Put Under a Swimming Pool

If you’re considering installing a swimming pool, one important aspect to consider is what to put underneath it. The base material you choose can have a significant impact on the stability, longevity, and overall quality of your pool. In this article, we will explore the importance of proper ground preparation and factors to consider before choosing a base material. We will also provide recommendations for various base materials and discuss potential alternatives.

Importance of Proper Ground Preparation

Before diving into the discussion about what goes under your swimming pool, it’s essential to understand why proper ground preparation is crucial. A solid and level base provides stability for your pool while preventing any shifts or settling that could lead to damage over time. Additionally, a well-prepared foundation helps protect the pool liner from punctures or tears caused by sharp objects or uneven surfaces.

Factors to Consider Before Choosing a Base Material

Several factors should be taken into account when selecting an appropriate base material for your swimming pool:

Soil Type and Stability

The type of soil in your backyard plays an integral role in determining which base material is suitable for your needs. Different soil types vary in their drainage capabilities and stability levels. It’s essential to assess whether you have sandy soil prone to shifting or clay-like soil with poor drainage.

Drainage and Moisture Control

Proper water drainage is crucial for maintaining the structural integrity of both above-ground pools and inground ones. When considering what goes under a swimming pool, make sure that the chosen base material allows adequate moisture control without causing excessive water accumulation around the area.

Leveling and Slope Adjustment

To ensure even distribution of weight across all areas of the pool floor, leveling becomes paramount during installation. If there are noticeable slopes or uneven terrain where you plan on placing your swimming pool, additional measures may be necessary before proceeding with any further preparations.

Recommended Base Materials for Swimming Pools

Now that we’ve covered the importance of ground preparation and factors to consider, let’s explore some recommended base materials for swimming pools. Each material has its own advantages, installation process, and cost considerations.

Concrete Slab

  1. Advantages:
  2. Provides a solid and stable base.
  3. Offers excellent protection against weed growth.
  4. Suitable for various pool sizes and shapes.

  5. Installation Process:

    1. Excavate the area to a specific depth depending on your local building codes or pool manufacturer recommendations.
    2. Pour concrete into the excavated area and level it using appropriate tools.
    3. Allow sufficient time for curing before proceeding with further pool installation steps.
  6. Cost Considerations:
    Concrete slabs can be relatively expensive due to labor costs involved in excavation, pouring, leveling, and finishing processes.


  1. Advantages:
  2. Provides a softer material underfoot compared to concrete or gravel.
  3. Allows water drainage while still offering support to the pool structure.

  4. Installation Process:

    1. Prepare the ground by removing any vegetation or debris from the designated area.
    2. Spread an even layer of sand over the entire surface ensuring proper leveling as you go along.

3.Cost Considerations:
Sand is generally an affordable option but may require occasional replenishment over time due to shifting or erosion caused by heavy rain or foot traffic.


– Offers excellent drainage capabilities while providing stability for above-ground pools
– Helps prevent weed growth underneath the pool

Additional Related Posts:
Can Dogs Swim In Pools
How To Practice Swimming Without A Pool

2.Installation Process:
1.Excavate your desired location according to specified depths based on local regulations or manufacturer guidelines
2.Place a layer of geotextile fabric over excavated area (this helps control weed growth)
3.Pour gravel evenly onto fabric making sure to level and compact as you go

3.Cost Considerations:
Gravel can be more costly than sand due to the need for geotextile fabric, but it offers durability and longevity.

Foam Padding

– Provides a cushioned layer between the pool liner and the ground.
– Easy installation process.

2.Installation Process:
1.Unroll foam padding over your designated area, ensuring complete coverage of the pool’s footprint
2.Trim any excess material if needed

3.Cost Considerations:
While foam padding is generally an inexpensive option, its protection against sharp objects or long-term wear may not be as robust compared to other materials.

Potential Alternatives to Consider

While concrete slabs, sand, gravel, and foam padding are popular choices for swimming pool bases, there are some alternative options worth exploring:

Rubber Mats

Rubber mats offer a protective layer that prevents damage from grass or other sharp objects. They provide additional support while maintaining a level surface for your pool.

Interlocking Tiles

Interlocking tiles can create a smooth surface that is easy to clean and maintain. These tiles offer excellent protection against weed growth and provide an attractive aesthetic for your swimming pool area.

Artificial Turf

Artificial turf provides a low-maintenance option with minimal water drainage requirements. It creates a lush green look without requiring regular mowing or watering like natural grass would.

Maintenance and Longevity Considerations

Proper maintenance practices play a crucial role in preserving both your swimming pool base material’s integrity and the overall lifespan of your pool. Here are some essential considerations:

Preventing Ground Shifts and Settling

To minimize ground shifts or settling issues around your swimming pool area:

  • Regularly inspect the surrounding soil for signs of erosion or movement.
  • Ensure proper drainage by regularly checking gutters, downspouts,
    and grading around the pool area.
  • Address any water accumulation issues promptly to prevent damage
    to the base material.

Protecting the Pool Liner

To protect your pool liner from punctures or tears caused by sharp objects:

  • Regularly remove any debris, such as sticks or stones, that may pose a risk to the liner.
  • Use protective layers such as foam pads or rubber mats underneath and around your swimming pool.

Ensuring Proper Drainage

Proper drainage is crucial for preventing excessive water accumulation around your swimming pool. Here are some steps you can take:

  • Regularly inspect and clean out gutters and downspouts to ensure proper water flow away from the pool area.
  • Monitor soil moisture levels regularly to identify potential drainage issues.


Additional Related Posts:
How Much Sodium Is in a Swimming Pool Sodium Tablet
Can a Pregnant Woman Swim in a Cold Pool

Q: What is the best material for a swimming pool base?

A: The best material for a swimming pool base depends on various factors such as soil type, stability requirements, budget considerations, and personal preferences. Concrete slabs offer durability and excellent weed protection but come with higher installation costs. Sand provides a softer underfoot experience but may require occasional replenishment due to shifting. Gravel offers excellent drainage capabilities but comes at a higher cost compared to sand.

Q: Can I use regular sand instead of specific types of sand mentioned in this article?

A: While regular sand might seem like an affordable option initially, it’s important to consider its suitability for supporting a swimming pool’s weight over time. Types of sands specifically designed for construction purposes (such as concrete sand or washed sand) provide better structural support while allowing proper drainage.

Q: Are foam pads enough protection against sharp objects that could damage my vinyl liner?

A: Foam padding offers minimal protection against sharp objects compared to other materials like gravel or rubber mats. It serves primarily as a cushioned layer between the ground and vinyl liner rather than offering substantial resistance against punctures or tears.

Q: What are the alternatives to using sand as a base material for my swimming pool?

A: Some alternatives to sand include gravel, foam padding, rubber mats, interlocking tiles, and artificial turf. Each alternative offers unique advantages such as better drainage capabilities (gravel), additional cushioning (foam padding), or weed protection (rubber mats).


Choosing the right base material for your swimming pool is crucial in ensuring its stability and longevity. By considering factors such as soil type, drainage requirements, and personal preferences, you can make an informed decision that meets your specific needs. Whether you opt for a concrete slab, sand, gravel or explore alternative options like foam padding or interlocking tiles – proper ground preparation and maintenance practices will help ensure a long-lasting and enjoyable swimming pool experience.


Swimming Pool Glossary:

  1. Amazon: An online marketplace where you can find a variety of swimming pool products, including pool base materials.

  2. Foam Tiles: Soft and cushioned tiles that can be used as a flooring option for swimming pools.

  3. Cheap Option: A more affordable choice for the materials to put under a swimming pool.

  4. Popular Option: A widely chosen material or product for placing under swimming pools due to its popularity among customers.

  5. Summer: The season when people often use their swimming pools the most.

  6. Pool on Grass: Placing a swimming pool directly on grass without any additional base or protection layer underneath it.

  7. Inflatable Pools: Portable and easy-to-set-up pools that are filled with air instead of being permanently installed in the ground.

  8. Pool Owners: Individuals who own and maintain swimming pools at their homes or establishments.

  9. Vinyl Pool Liner: A type of liner made from vinyl material that is used to cover the inside walls and floor of a pool, providing protection and enhancing its appearance.

  10. Above-Ground Swimming Pools: Pools that are constructed above ground level rather than being built into the ground itself.

  11. Kiddie Pool: Small-sized inflatable or plastic pools designed specifically for young children to play in safely under adult supervision.

12.Durable Options:
Materials or products known for their longevity, strength, and resistance against wear and tear when placed under a swimming pool.

Unwanted plants that may grow around or underneath an outdoor area like a backyard where you might install your swimmmingpool

Individuals who purchase products such as materials suitable putting beneath swimmmingpools

15.Pool Mat:
A mat designed specifically for placement underneatha swimmpool to protect it from potential damage caused by rough surfaces

16.Pool Wall
The vertical sides (walls) of a swimming pool that enclose the water.

17.Pre-cut Pool Pad:
A pre-measured and pre-shaped padding specifically designed to fit the dimensions of your swimming pool, providing additional protection for its base.

18.Pool Liner Pad:
A layer of material placed underneath the vinyl liner to provide extra cushioning and protection against punctures or tears.

19.Commercial Pool Pads:
Sturdy and heavy-duty pads often used in public or commercial pools to ensure durability and safety.

20.Common Pool Sizes:
Standard dimensions for swimming pools that are commonly available in the market, such as 15-foot round pools or 24-foot long above-ground pools.

21.Pool Floors:
The bottom surface area inside a swimmpool

22.Pool Floor Pad:
A protective layer placed between the ground/sand base and the pool floor to prevent damage

23.Pool Sand:
Granular material typically used as a base layer beneath swimming pools

24.Cheaper Options:
More affordable alternatives when it comes to choosing materials for placing under a swimmmingpool

25.Cheapest Options
The most budget-friendly choices available for placing under a swimmpool

26.Low-cost Option
An alternative that is relatively inexpensive compared to other options suitable putting beneatha swimminmgpool

27.Viable Option
A practical choice among various alternatives with favorable qualities suited for use under a swimmimngpoo

28.Layer of Protection
An additional barrier or cushion added between the ground/sand base and pool floor/liner, providing extra protection against potential damage.

29.Liner Over Time
Refers how wellthe material used underneath will hold up over time

30.Excellent Choice
A highly recommended option known for its quality performance when placed under a swimmimgppol
31.Refining Tweakes
Small adjustments made during installation or setup process
32.Blue Wave
Pool product brand known for its quality and reliable products
33.Ease of Installation
Refers to how easy or straightforward the installation process is
34.Biggest Concerns
The main worries or issues that pool owners may have when it comes to selecting suitable materials to place under their swimming pools

35.Wall Degradation
Damage or deterioration that occurs on the walls of a swimminpool over time

36.Sand Base
A layer of sand used as a foundation for above-ground pools, providing stability and leveling.

37.Base Layer
The initial layer placed beneath the swimming pool as a support structure.

38.Proper Base
A well-prepared and stable foundation that ensures the longevity and integrity of an above-ground pool.

39.Firm Base
A solid and compacted surface serving as a stable platform for setting up an above-ground pool.

40.Type of Sand
Different varieties or grades of sand used in constructing bases for swimming pools, such as Washed Sand known for its cleanliness.

41.Breathable Material
Materials with properties allowing air circulation, preventing moisture buildup underneaththe swimmipool

42.Durable Material
Strong and long-lasting substances used underneathswimmpools

43.Tough Materials
Sturdy materials resistant against wear, tear,and external damage

44.Natural Ground
Untreated soil surface without any added layers or modifications made prior to installing a swimmpool

45.Extra Layers
Additional cushioning layers placed between various components (such as base materialand liner) withina swmmppol

46.Foam Mats
Padded mats often used beneatha swimimpollas added protection aganist rough surfaces

47.Nut Grass
An invasive type plant species capableof growing through weak barriers including those put downbeneatha swmimpoo

48.Patch Of Grass
Small area covered in grass where one might consider placing/swttingup a swiimpool

49.Simple Installation
Easy and straightforward process of setting up a swimmpoll, usually requiring minimal tools or equipment

50.Above-Ground Pool Base
The foundation or support structure for above-ground swimming pools, including the base material and any additional layers.

51.Metal Pool Wall
Vertical walls made from metal components that enclose an above-ground pool.

52.Pool Legs
Supportive structures attached to the bottom edge of an above-ground pool wall to provide stability.

53.Geo-textile Pool Pads
Specialized pads made from geotextile fabric used as underlayment beneatha swimipoo

54.Swimming Pool Liner
A layer of material that covers the inside walls and floor of a swimming pool, providing waterproofing and enhancing aesthetics.

55.Above-Ground Gravel Pool Foundation
An alternative base option for above-ground pools involving using gravel as the supporting layer.

56.Above-Ground Pool Base Cost
The expenses associated with purchasing materials required to establisha firmfoundation foranabove- ground pool.

Brand name offering various typesofswimipools

58.Commercial Under-Pool Pad
Heavy-duty padding designed specificallyfor commercial pools

59.Footprints in Pool Floor
Indentations or marks left onthe floor surfaceofaswmippol, often caused by unevenness or insufficient cushioning underneath.

60.Ground Pool Bases
Different options availablefor constructing abaseunderneathgrounpool

61.Ground PoollPad
A protective layer placed between agroounpooland its surrounding ground,servingasa barrier against potential damage.

62.GroudPool Underlayment
Material installed belowthelinerinagronndpooleithertoprovideadditionalcushioningshieldagainstpuncturesoractsasaninsulationlayer

63.Heavy Pool
Refers to a swimming pool with significant weight, often requiring sturdier and more durable materials for its foundation.

64.Inflatable Pool Materials
The substances used in the manufacturing of inflatable pools, such as PVC or vinyl.

65.Inflatable Pool Models
Different designs and sizes available for inflatable pools that vary in shape, capacity,and features.

66.Inground Vinyl Liner Pools
Swimming pools constructed ingroundwith a vinyl liner coveringthe wallsandfloor

67.Intex Pool
Brand specializinginthe productionofvarious types ofswimipools

68.Pool from Abrasions
Protecting the swimmpool materialfrom potential damage causedbyabrasive surfaces

69.Pool Material
The substance or fabric usedto constructthephysical structureofa swimmpol

70.Pool on Dirt
Placingaswmippoldirectlyonuncoveredsoilwithoutany additional layers or protection

71.Pool on Pavers
Setting upa swimmoopaboveapaver surfaceforadditional stabilityandprotection against soilor weed intrusion

72.Pool Wall Foam
A foam-based padding specifically designed to be installed onto the inner wall surface of a swimmimgpool,reducing injury risksandproviding insulation properties.

73.Potential Pool Collapse
Risk of structural failure ora catastrophic event occurringthat couldcause thepooftocollapse

74.Prices ofPool Pads
Costs associated with purchasing various options suitablefor placing under aswimimpoll

75.Professional Pool Pad
High-quality pads specifically recommended by professionals due to their performance and durability.

76.Smooth Poole Floor
An even,sleek surface area insideathepoole that offerscomfortandsafety when usingit

77.Strong and Eco-FriendlyPool Pad
Durablepaddingoptionsthat areenvironmentally friendlywhile still offering reliable support.

78.Trendium Pool Products
A brand offering a range of pool products, including above-ground pools and accessories.

Related Posts

Avatar photo

Mike Hunter

Mike is the owner of the local pool shop. He's been in the business for over 20 years and knows everything there is to know about pools. He's always happy to help his customers with whatever they need, whether it's advice on pool maintenance or choosing the right chemicals. He's also a bit of a pool expert, and is always happy to share his knowledge with anyone who's interested.

Leave a Reply

Your email address will not be published. Required fields are marked *