What to Put under Pool Legs: Best Materials for Stability

Setting up a pool in your backyard feels exciting. But there’s one detail many people forget: what to put under the pool legs. This small step can make the difference between a safe, long-lasting pool or headaches like sinking frames, torn liners, and uneven water. If you’ve ever seen pictures of a leaning pool or heard stories of wobbly ladders, you know this problem is real.

Choosing the right support under your pool legs matters more than you might think. It protects your pool, your yard, and your investment. But with so many options—pavers, pads, wood, foam, and more—how do you know what’s best? This guide dives deep into everything you need to know, from materials to mistakes to avoid.

Whether you’re setting up a small above-ground pool or a large steel-frame model, you’ll find clear answers here.

Why Support Under Pool Legs Matters

When a pool is full, it weighs thousands of pounds. Even small pools can press hundreds of pounds on every leg. If these legs sit on soft ground, grass, or uneven surfaces, they can sink, tilt, or even punch through the liner.

Once this happens, your pool becomes unsafe and could collapse.

The right support under the legs spreads out the weight. It keeps the legs stable and protects both your pool and the ground beneath. It also makes your pool last longer, saving money and effort in repairs.

Common Problems When Pool Legs Are Not Supported

Before looking at solutions, let’s talk about what can go wrong without proper support:

• Sinking legs: Pool legs can press into dirt or grass, especially after rain.
• Uneven water level: If some legs sink more than others, water tilts. This puts stress on the frame and liner.
• Frame damage: Metal legs can bend or break if not stable.
• Liner tears: If a leg punctures the liner, it can cause leaks.
• Safety risk: A pool that tips or collapses can hurt people nearby.

Many beginners focus on leveling the base but forget about supporting the legs. This is a mistake that often leads to bigger problems later.

What To Put Under Pool Legs: Top Options Explained

Let’s look closely at the best materials you can use under pool legs. Each has its pros, cons, and best uses. Some work better for small pools; others are made for heavy-duty frames.

1. Concrete Pavers

Concrete pavers are one of the most popular choices. These are flat, heavy stones you can buy at any hardware store.

• Pros: Spread weight well, don’t rot, last many years, easy to buy.
• Cons: Can be hard to level perfectly, heavy to move, may look unattractive if exposed.

How to use: Dig out a small area under each leg. Place the paver so it sits flat and level with the ground. Make sure each paver is the same height.

2. Pressure-treated Wood

Pressure-treated wood planks (like 2×8 or 2×10 boards) are also common.

• Pros: Easy to cut to size, more flexible than stone, affordable.
• Cons: Can warp over time, may rot if not treated well, not as long-lasting as concrete.

How to use: Cut boards into squares or rectangles, larger than the pool foot. Place under each leg, making sure the wood is flat.

3. High-density Foam Pads

Special high-density foam pads or blocks are made for pool supports.

• Pros: Lightweight, easy to cut, absorb shock, protect the pool liner.
• Cons: Can compress over time, more expensive, may break down in sun.

These are especially popular for Intex and other above-ground pools.

Tip: Buy foam designed for outdoor use. Indoor foam will break down too fast.

4. Plastic Deck Blocks

Plastic deck blocks are thick, heavy-duty plastic pads. They’re made to hold up decks but work for pools too.

• Pros: Waterproof, don’t rot, distribute weight well.
• Cons: More expensive, may be hard to find locally, can shift if ground is not flat.

How to use: Place under each leg after leveling the ground.

5. Rubber Patio Stones

Rubber patio stones are made from recycled tires. They’re softer than concrete but still strong.

• Pros: Soft on pool liner, weatherproof, won’t crack.
• Cons: Can shift or slide, not as rigid as stone.

Great for areas where kids play, as they’re less likely to hurt feet.

6. Composite Paver Blocks

Composite pavers use recycled materials, like plastics or wood fibers. They last a long time and resist weather.

• Pros: Lightweight, easy to install, durable.
• Cons: More expensive, not always as strong as concrete.

Popular with eco-friendly pool owners.

7. Metal Plates

Some people use metal plates or sheets under pool legs.

• Pros: Very strong, thin, resist breaking.
• Cons: Can rust, may be slippery, can get very hot in sun.

Not the top choice for most, but an option if you have leftover materials.

8. Interlocking Floor Tiles

Interlocking tiles (like gym or playground tiles) can be used for smaller pools.

• Pros: Easy to move, fit any shape, cushion liner.
• Cons: Not for heavy pools, can shift, not always UV stable.

They work best for kiddie pools or small, lightweight frames.

9. Concrete Slab Or Platform

Some pool owners build a full concrete slab or platform.

• Pros: Best for heavy pools, perfectly level, lasts decades.
• Cons: Most expensive, hard to remove, takes time and skill to build.

If you want a permanent pool setup, this is the gold standard.

10. Patio Stones Or Stepping Stones

Common patio stones (flat, square stones) are easy to find.

• Pros: Cheap, easy to replace, solid.
• Cons: Can crack, may be uneven if ground is not prepared.

These work well for temporary pools or rental homes.

11. Sand Compacted Base

Some people use compacted sand under the whole pool and legs.

• Pros: Cheap, easy to level, soft.
• Cons: Can wash away, shifts over time, not enough support for heavy pools.

Sand is best as a base layer, not just under legs. Always combine with something solid under the legs.

12. Thick Outdoor Carpet

Outdoor carpet or turf can work for very small pools.

• Pros: Soft, easy to move, protects grass.
• Cons: Not for big pools, can rot, doesn’t provide solid support.

Use only for small, lightweight pools that don’t hold much water.

13. Bricks Or Masonry Blocks

Bricks or masonry blocks are sometimes used.

• Pros: Easy to stack, cheap, strong.
• Cons: Hard to level, can shift, may crack.

If you use bricks, make sure they’re rated for outdoor use.

14. Heavy-duty Commercial Pads

Some companies sell commercial-grade pool pads just for pool legs.

• Pros: Designed for pools, weatherproof, very strong.
• Cons: Most expensive option, only sold at specialty stores.

Often used by professional installers for permanent pools.

15. Gravel Base With Paver Tops

Some use a gravel base topped with pavers.

• Pros: Good drainage, reduces shifting, strong.
• Cons: More work to install, gravel can poke liner if not careful.

The gravel stops water from pooling under the legs.

16. Custom-made Steel Plates

Some pool owners have custom steel plates made by a local metalworker.

• Pros: Custom fit, very strong, lasts forever.
• Cons: Expensive, can rust, needs special tools to make.

Rarely used, but an option if you want a perfect fit.

17. Old Railroad Ties (not Recommended)

Old railroad ties have been used in the past.

• Pros: Very strong, big surface, cheap if you find them used.
• Cons: Often soaked in chemicals, can leak, may rot, not safe for kids.

Most experts do not recommend this, but it’s sometimes seen in older setups.

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Below is a comparison of popular options, focusing on cost, ease of use, and durability:

How To Choose The Right Material For Your Pool

With so many choices, how do you pick the right support for your pool legs? Here’s a practical approach:

• Pool size and weight: Heavy, large pools need stronger support (like concrete or commercial pads). Small pools can use foam or wood.
• Climate: If you get lots of rain, choose materials that won’t rot or shift (like stone or plastic).
• Budget: Concrete pavers and wood are cheap; custom metal or commercial pads cost more.
• Looks: If you care about appearance, composite or rubber stones look nicer.
• Permanence: For permanent pools, invest in a concrete slab or heavy-duty support.

Non-obvious insight: Even if you plan to move your pool in the future, laying good supports now can save hours of work and prevent costly mistakes.

Credit: www.youtube.com

Step-by-step Guide: Installing Support Under Pool Legs

Let’s go through the process of adding support under your pool legs. Each step is important—don’t skip ahead!

Step 1: Mark Out Your Pool Area

Use stakes and string to outline the pool space. Mark where each leg will sit. This helps plan the supports.

Step 2: Level The Ground

Use a long level and a straight board. The ground must be perfectly flat, or your pool will lean.

Step 3: Dig Out Support Spaces

For each leg, dig out a hole the size of your support material (like a paver or board). The goal is for the top of the support to be even with the ground.

Step 4: Lay The Support Material

Place your chosen support (paver, wood, foam, etc. ) In each hole. Check with a level. If needed, add or remove dirt until each is flat.

Step 5: Fill And Compact

Backfill around the supports with dirt, sand, or gravel. Compact tightly. This stops shifting over time.

Step 6: Set Up The Pool Frame

Place the pool frame so each leg sits perfectly centered on its support.

Step 7: Final Level Check

Before filling with water, check every leg with a level again. Small differences now become big problems when the pool is full.

Step 8: Fill The Pool Slowly

Add water a few inches at a time. Watch the supports—if any leg shifts, pause and adjust.

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Below is a step-by-step comparison for pavers vs. foam pads for a standard 12-foot above-ground pool:

Common Mistakes To Avoid

Even with good materials, mistakes can ruin your setup. Here are frequent errors beginners make:

• Choosing the wrong size: Supports must be larger than the foot of the pool leg, not smaller.
• Not leveling each support: Even a tiny tilt causes big problems.
• Using soft wood or untreated lumber: These rot and collapse.
• Placing supports above ground level: Makes the pool sit unevenly.
• Not compacting soil: Supports can sink if soil is loose.
• Ignoring drainage: Water pooling around supports can cause sinking and shifting.

Practical tip: Always check local building codes. Some areas have rules for pools over a certain size.

Which Pool Types Need Special Support?

Not all pools are the same. Here’s what to know about different pool types:

• Steel frame pools: These need the strongest supports, as the legs carry huge weight.
• Inflatable ring pools: Less pressure on legs, but still need a smooth, level base.
• Resin or plastic frame pools: Lighter, but still need supports to prevent sinking.
• Soft-sided or pop-up pools: Can use softer materials but don’t skip support.

Even if a pool seems “light,” remember that water is heavy—just one cubic foot weighs about 62 pounds (28 kg). A small pool quickly adds up.

Extra Tips For A Long-lasting Pool Setup

• Check supports every season: Freeze and thaw can shift materials.
• Replace worn supports: If you see cracks, rot, or sinking, swap for new ones.
• Add landscape fabric: Under the pool and supports, this stops weeds and grass from growing up.
• Consider drainage: If your yard floods, build up the pool area with gravel or stone first.
• Mark support locations for next year: If you take your pool down each winter, you won’t have to measure again.

Non-obvious insight: Paint the tops of wood or metal supports with waterproof sealant. This small step prevents early breakdown.

Credit: www.youtube.com

Real-world Examples

• Case 1: An Intex Ultra Frame pool on grass with only a tarp under the legs. Result: After one summer, legs had sunk 2 inches, liner stretched, pool leaned.
• Case 2: A steel pool frame on concrete pavers, all set at ground level. Result: Pool stayed level for five years, no repairs needed.
• Case 3: Small pop-up pool with foam tiles on a patio. Result: Easy to set up and move, but foam compressed after two summers and needed replacing.

These examples show that picking the right support pays off in less repair and stress.

How Weather And Soil Affect Your Choice

Climate and ground type change what works best:

• Clay soil: Holds water, shifts in freeze/thaw. Use concrete or plastic supports.
• Sandy soil: Can wash away. Add compacted gravel under supports.
• Wet climates: Avoid wood, use stone or plastic.
• Hot, sunny areas: Metal can get too hot for feet. Use lighter colors or cover supports.

Fact: In areas with lots of rain, some pool owners report supports sinking up to 3 inches over one summer if only sand is used.

Credit: www.reddit.com

How To Fix A Sinking Pool Leg

If you notice a leg sinking after setup, act fast:

• Drain part of the pool (just enough to remove weight from the leg).
• Lift the frame with help or a lever.
• Add more support (like a thicker paver or pad).
• Refill slowly, checking that the pool stays level.

Leaving a sinking leg can lead to frame bends or total pool failure.

Diy Vs. Professional Installation

Most above-ground pool owners do the work themselves. But for large, expensive pools, hiring a pro can be smart. They know how to prepare the ground, lay supports, and avoid common mistakes.

DIY Pros: Saves money, can adjust or move pool later, learn useful skills.

DIY Cons: Takes more time, possible mistakes, may void warranty if not done right.

Professional Pros: Fast, reliable, may include warranty, less risk.

Professional Cons: Costs more, less control over details.

If you’re unsure, many pool stores offer advice or even partial setup help.

Environmental Concerns

Some materials are better for the planet:

• Composite pavers and rubber stones use recycled materials.
• Concrete lasts a long time but takes energy to make.
• Old railroad ties may leak chemicals—avoid if possible.

If you want a green solution, check for recycled options and avoid treated woods near gardens.

Cost Comparison: What To Expect

Costs can vary a lot, depending on pool size and local prices. Here’s a rough breakdown for a medium (12-foot) above-ground pool with 12 legs:

Remember, spending a little more now can save hundreds in repairs later.

Maintenance After Setup

Once your pool is up and running, don’t forget about the supports:

• Check for shifting after storms or heavy rain.
• Remove grass or weeds growing around supports.
• If you see mold or rot on wood, replace it.
• After every season, clean and inspect before packing away or covering for winter.

Where To Buy Pool Leg Supports

You can find most materials at:

• Local hardware stores (concrete, wood, pavers)
• Pool supply shops (specialty pads)
• Home improvement stores (rubber, composite pavers)
• Online retailers (commercial pads, foam blocks)

For more details on pool safety and setup, see Wikipedia’s swimming pool article.

Frequently Asked Questions

What Size Should The Support Under Pool Legs Be?

The support should be at least twice as wide as the leg foot. For example, if your leg is 4 inches wide, use an 8-inch or larger support. This spreads the weight safely.

Can I Use Leftover Bricks Or Tiles Under Pool Legs?

Yes, but only if they are strong, level, and rated for outdoor use. Avoid thin or cracked tiles—they can break under weight.

What If My Ground Is Not Level?

Level the ground before adding supports. Use a long level, shovel, and rake. Never place supports on uneven dirt, as this causes dangerous tilting.

How Often Should I Check Under The Pool Legs?

Check at least once per season, and after big storms. If you see sinking, cracks, or shifting, fix it right away.

Are There Supports Made Just For Pool Legs?

Yes, some companies make commercial-grade pads or blocks just for pool legs. These are more expensive but designed for heavy use and long life.

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Getting your pool legs supported right isn’t just a small step—it’s the key to a safe, fun, and stress-free summer. With the right base, you’ll enjoy your pool for years, avoid costly repairs, and keep everyone safe. Take the time to choose and install supports carefully.

Your pool, your yard, and your family will thank you every time you dive in.