Can You Use Gap 20 Aggregates Around Pools or Outdoor Entertaining Spaces?

Yes, you can use Gap 20 aggregates around pools and outdoor entertaining spaces—but only if you understand how and where they work best. While Gap 20 is commonly used as a compactable base layer, it’s not always the most suitable option for top-layer finishes where barefoot traffic, aesthetics, and water management matter. The key lies in using Gap 20 properly—typically beneath more suitable surface materials—and ensuring it supports both function and comfort in your outdoor design.

Why Even Consider Gap 20 Around Pools or Outdoor Areas?

When people plan their outdoor spaces—especially around pools or patios—they’re usually thinking about aesthetics, safety, drainage, and low maintenance. So why does a construction-grade aggregate like Gap 20 come into the picture?

Because it’s incredibly stable, cost-effective, and excellent for drainage when compacted correctly.

Gap 20, which refers to a mix of stones and fines up to 20mm in size, creates a solid sub-base when compacted. It’s a go-to base layer for everything from concrete slabs to pavers and decorative gravel. That makes it incredibly useful underneath pool surrounds, decking, gobi block, or other hardscape features where a solid foundation is essential.

But should it be exposed on the surface in high-traffic, wet areas like pool zones?

Let’s break it down.

Understanding the Role of Gap 20 Aggregates

Before you decide whether Gap 20 is right for your outdoor area, it's important to know what it's designed for and how it's commonly used:

  • Compaction: Gap 20 compacts tightly due to the blend of coarse stones and fine particles. This makes it an excellent choice under driveways, patios, and even artificial turf.

  • Drainage: The coarse nature allows water to pass through while maintaining structural integrity.

  • Support: It provides a firm, level base for top-layer materials such as paving stones, concrete, or finer aggregates.

So while Gap 20 works brilliantly beneath the surface, it's rarely used on top—especially around pools—because the loose top stones can shift, cause discomfort underfoot, and create debris in pool water.

Poolside Priorities: Comfort, Cleanliness, and Drainage

When choosing materials around a pool, you're usually juggling a few critical concerns:

  1. Foot Comfort
     Bare feet and rough stones aren’t always the best mix. Gap 20’s larger stones (up to 20mm) and coarse texture can feel sharp and uncomfortable—especially for children or seniors.

  2. Cleanliness
     Since Gap 20 isn’t tightly bound on the surface, loose stones can easily be kicked or tracked into the pool, clogging filters and causing more frequent cleaning.

  3. Slip Resistance
     Although the coarse surface of Gap 20 offers good grip, it can still be inconsistent. Uneven patches or loose stones can create trip hazards.

  4. Aesthetic Appeal
     Gap 20 looks rugged and utilitarian—great under a driveway, not so great beside a sleek swimming pool.

Because of these concerns, it’s often better to use Gap 20 as a sub-base, then add a more suitable top layer, like paving, gobi block, or decorative mulch, for safety and visual appeal.

Best Use of Gap 20 Around Pools: As a Solid Foundation

Rather than leaving Gap 20 exposed, use it to create a stable base beneath:

1. Paving Stones or Tiles

By laying Gap 20 Aggregates in Auckland beneath pavers or pool tiles, you get the stability you need without sacrificing appearance or comfort. Top it with sand or finer aggregates like Gap 7 for leveling, then place your pavers.

2. Gobi Block Pathways

If you love the look of permeable surfaces, gobi block laid over Gap 20 creates a visually striking and eco-friendly option. The block’s interlocking design allows water to drain easily and pairs well with a compacted aggregate base.

3. Outdoor Kitchens or Fire Pit Zones

In your entertaining areas, Gap 20 can serve as the foundational base beneath concrete pads or stonework, especially when constructing outdoor bars, pizza ovens, or fire pits. It resists settling and holds up well under weight.

Alternatives to Gap 20 for Top Layers

If you're considering leaving the surface exposed, here are better materials to explore:

- Gap 7

This finer version of Gap 20 offers a more compact, smoother finish and can be used as a top layer in light-traffic areas. It’s less abrasive and sits more tightly, minimizing stone scatter.

- Decorative Mulch

For a softer, more natural look in lounging or garden areas surrounding the pool, decorative mulch offers both function and style. It’s gentle underfoot and adds earthy texture while helping control weeds and moisture.

- Pebbles or Rounded Decorative Gravel

Rounded stones or beach pebbles are often preferred over sharp gravel types for barefoot areas. They stay cooler in the sun and are easier on the skin.

- Artificial Turf Over Gap 20 Base

Another trend gaining traction in Auckland is synthetic grass installed over compacted Gap 20 and a sand levelling layer. This gives you a clean, soft surface around the pool without ongoing mowing or mess.

Real-World Example: Auckland Backyard Pool Upgrade

Let’s take a look at a real-world case study.

The Challenge:
 A homeowner in West Auckland wanted to renovate the area around their plunge pool. The original surface was patchy lawn that turned to mud in the rain.

The Solution:

  • They first dug out the area and laid down a 100mm layer of Gap 20, compacted it with a plate compactor to form a stable base.

  • On top of that, they added a 25mm layer of Gap 7 to level the surface.

  • Then came the installation of large-format pavers around the pool edge and gobi block paths leading to the patio.

  • Finally, they added decorative mulch in adjacent garden beds to soften the look and tie it together.

The Result:
 The space became stylish, safe, and low-maintenance. The pool stayed clean, and the kids could run around barefoot with no issues.

FAQs

Can I just use Gap 20 as a surface material around the pool?

Technically yes, but it’s not recommended unless the area is strictly utilitarian or not used for lounging or barefoot access. It’s better used as a compacted base layer.

Is Gap 20 good for drainage around pools?

Absolutely. It allows water to drain effectively when used under other materials, preventing water pooling or undermining foundations.

How thick should the Gap 20 layer be?

For outdoor hardscape areas, a 75mm–100mm compacted layer is typical. If you’re placing it under concrete or heavier structures, up to 150mm may be used.

Is Gap 20 better than Gap 40 for pool areas?

Gap 40 has larger stone and is used for heavier-duty applications like road bases. For residential or landscaping use around pools, Gap 20 is more appropriate due to better compaction and a smoother finish.

Conclusion: Use Gap 20 Wisely—Below, Not On Top

To wrap it all up, Gap 20 aggregates are excellent for building solid, well-draining, and long-lasting outdoor entertaining spaces, including areas around pools. But they should not be used as a surface layer where comfort and cleanliness are top priorities.

Instead, think of Gap 20 as your invisible hero—the hardworking foundation beneath more suitable surface materials like pavers, gobi block, or decorative mulch. When used correctly, it helps you create an outdoor space that’s not just beautiful, but functional and built to last in Auckland’s variable weather.

So go ahead—use Gap 20 around your pool. Just make sure it’s under something nicer to walk on.
Location: 180 Fred Taylor Drive, Whenuapai, Auckland 0814, New Zealand

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