Artificial Grass Sub-Base: Is Sharp Sand Right and How Much Do You Need?

Artificial grass has become a popular landscaping solution in Melbourne, offering a lush, low-maintenance alternative to natural lawns. 

But achieving that flawless finish isn’t just about laying down the turf—what lies beneath it is equally critical. One key component in preparing the perfect base is sharp sand, which plays a crucial role in creating a smooth and stable foundation.

With more and more homeowners embracing artificial turf to combat the challenges of unpredictable weather and water restrictions, understanding the right preparation techniques has never been more important.

Installing artificial grass properly not only enhances its lifespan but also improves its appearance and functionality.

In this article, we’ll delve into everything you need to know about using sharp sand for artificial grass in Melbourne, from how much you’ll need to why it’s a vital step in the installation process. 

Sharp sand is an essential material when it comes to installing artificial lawn, providing a stable and level foundation that ensures long-term durability and aesthetic appeal.

Sharp sand, also known as grit sand or construction sand, is a coarse-grained material commonly used in landscaping and construction.

Its angular grains interlock to form a firm base, which is why it’s ideal for creating a stable sub-layer beneath synthetic grass.

Types of Sand Used

• Sharp Sand: Offers excellent drainage and provides the stability needed for heavy foot traffic.
• Kiln-Dried Sand: Often used as a top layer for brushing into the synthetic turf to keep fibres upright.
• Soft Sand: Generally unsuitable for this purpose due to its fine texture, which doesn’t provide adequate support.

While kiln-dried sand is primarily used for finishing, sharp sand is the go-to choice for the foundational layer.

Advantages

• Stability and Support: Sharp sand prevents the synthetic lawn from shifting or sagging, ensuring a level surface over time.
• Improved Drainage: Its coarse texture allows water to pass through easily, reducing pooling and waterlogging.
• Enhanced Durability: By creating a solid foundation, sharp sand extends the lifespan of artificial grass installations.
• Cost-Effective: Compared to other base preparation methods, using sharp sand is budget-friendly while still delivering excellent results.

Challenges

• Calculating the Right Quantity: Determining how much sharp sand is needed can be tricky and varies depending on the size and condition of your site.
• Labour Intensive: Spreading and compacting the sand requires effort and proper tools for an even layer.
• Weather Sensitivity: Installing during Melbourne’s wet weather can make working with sand more challenging due to clumping or shifting.

Recommended Depth

For most artificial turf installations, a sharp sand layer of 25–50mm (2–4 cm) is ideal. This depth strikes a balance between providing a solid foundation and maintaining good drainage.

Nonetheless, the stability of the turf might be compromised. Any more, and the surface may become overly loose, making it difficult to compact properly.

How to Calculate Sand Amount

To calculate the volume of sharp sand required, use the following formula:

Area (in square metres) x Desired Depth (in metres) = Volume (in cubic metres)

For example: If your lawn measures 20 square metres and you want a sand depth of 0.03 metres (30mm), the calculation is: 20 x 0.03 = 0.6 cubic metres of sharp sand.

Considering Ground Conditions

Melbourne’s soil conditions can vary significantly, from clay-heavy soils to sandy loams. If your ground is particularly uneven or soft, you may need to increase the depth of the sand layer to ensure proper levelling and stability. For instance:

• Uneven Ground: Requires more sand to fill low spots.
• Clay Soil: Benefits from a slightly thicker sand layer to improve drainage.

How to Order Sharp Sand

Sharp sand is typically sold by weight, measured in tonnes. One cubic metre of sharp sand weighs approximately 1.4–1.6 tonnes, depending on its moisture content. Using the previous example, you’d need about 0.6 x 1.5 = 0.9 tonnes of sand.

Tips to Avoid Common Mistakes

1. Double-Check Your Measurements: Even a small error in calculations can lead to over- or under-ordering.
2. Consider Waste: It’s a good idea to order 5–10% extra to account for compaction or uneven spreading.
3. Consult Professionals: If you’re unsure, many suppliers in Melbourne offer advice or on-site evaluations to help determine the right amount of materials.

Assessing Site Conditions

Before starting your synthetic grass installation, it’s essential to evaluate the specific conditions of your site.

Soil Type and Stability

• Clay Soil: Common in many Melbourne suburbs, clay soil requires extra attention to drainage. Incorporating a sub-base like a crushed rock below the sharp sand can help prevent water pooling.
• Sandy Soil: Drains naturally but may require additional compaction to provide a stable surface for the artificial turf.

Drainage Considerations

Poor drainage can lead to waterlogging and turf damage. Ensure your site slopes slightly away from structures to allow water to flow effectively.

If natural drainage is insufficient, consider installing a geotextile membrane or drainage pipes beneath the sand layer.

Sizing and Space Recommendations

Measuring Your Lawn

Use a tape measure to determine the length and width of the area. Multiply these figures to calculate the total square metres. For irregular shapes, divide the lawn into smaller rectangles or circles and sum up the areas.

Allowing for Borders

Consider including a buffer zone around the edges of your lawn for clean transitions. Borders often require additional sharp sand to ensure stability.

Melbourne-Specific Regulations and Guidelines

Regulations regarding synthetic turf installation can vary between local councils in Melbourne. Always check for specific requirements in your area before proceeding.

Environmental Impact

While synthetic lawn reduces water usage, councils may have restrictions on its installation to preserve natural habitats or ensure adequate drainage.

• Check whether your council requires specific materials or drainage solutions for synthetic turf installations.

Permits and Approvals

Some councils require permits for extensive landscaping projects, particularly if they involve altering drainage or excavating near property boundaries. Consult your local council office for guidance.

Recommendations for a Professional Finish

Following best practices can ensure your artificial grass looks great and lasts for years.

Compaction Techniques

• Use a vibrating plate compactor or roller to compress the sharp sand layer.
• Aim for an even, firm surface with no loose areas.

Choosing Quality Materials

Invest in high-quality artificial turf and sharp sand. Cheaper alternatives may save money upfront but can lead to issues like sinking uneven surfaces, or poor drainage.

Tips for Working with Sharp Sand in Melbourne

Managing Wet Sand

During rainy periods, sand can clump together, making it harder to spread and compact. Schedule your installation during dry weather to avoid delays.

Addressing Heat and Sun

On hot days, sharp sand can dry out quickly, increasing dust. Lightly mist the sand with water to minimise dust and improve compaction.

Key Takeaways

• Sharp sand is used as the foundation layer to provide stability, support, and drainage.
• Aim for a sand depth of 25–50mm, adjusting based on ground conditions.
• Calculate the amount of sand using the formula: Area (m²) x Depth (m) = Volume (m³).
• Melbourne’s clay-heavy soils may require additional drainage solutions like a geotextile membrane.
• Check for local council regulations and permits to ensure compliance.
• Compact the sand layer properly for a stable and even surface.

At Reelgrass, we’ve built a reputation as Melbourne’s go-to specialists in artificial grass installation. With years of experience and a commitment to precision, we ensure every project is completed to the highest standard.

Don’t let guesswork or costly mistakes get in the way of your perfect lawn—our team is here to guide you every step of the way.

Whether you’re unsure about how much sharp sand you need or want tailored advice for your specific site conditions, we’re ready to help.

Contact Reelgrass today at 1300 306 389 or claim your fast and FREE quote online to save time and money.