How to Fix Artificial Grass Sinking: Tips to Prevent Sinking Spots and Holes

Sunken spots in your synthetic lawn can turn an otherwise pristine outdoor space into a frustrating mess. 

Dealing with artificial grass that’s collapsing or uneven isn’t just an aesthetic concern — it can be a sign of deeper installation or drainage issues that need proper attention.

With more Melbourne homeowners embracing artificial turf as a sustainable, low-maintenance alternative, small imperfections like dips or uneven surfaces are becoming increasingly common.

These challenges often stem from unstable sub-bases, poor drainage, or heavy foot traffic. Fortunately, solutions are available — and you don’t always need a complete redo to get your yard back on track.

In this article, you’ll discover why your artificial grass is sinking, how to fix it properly, and how to prevent it from happening again. 

We’ll also cover the right tools and materials for the job, offer advice for both DIY fixes and professional assistance, and highlight essential maintenance tips to preserve your lawn’s long-term performance.

Designed for durability and minimal maintenance, synthetic grass is made from layers of plastic fibres attached to a backing layer, then installed over compacted crushed rock or another stable surface.

When installed correctly, it creates a lush, evergreen appearance year-round, without the need for mowing, watering, or chemical treatments.

Despite these clear advantages, artificial lawns can occasionally sink. The issue generally arises not from the grass material itself, but from problems in the installation process or shifting ground underneath.

Subsurface movement, poor drainage, or inadequate compaction can lead to depressions or sagging spots. While frustrating, these are typically correctable with targeted repairs.

Environmental Considerations with Artificial Grass Repairs

While synthetic turf eliminates the need for fertilisers and watering, reducing runoff and water waste, some repair activities could disturb soil layers, especially if deeper excavation is required.

If done carelessly, this might compromise nearby tree roots or natural drainage systems.

To reduce environmental impact, homeowners should reuse existing turf where possible and avoid excessive use of adhesives or synthetic infill materials.

Choosing recycled or recyclable base materials, such as crushed concrete or eco-certified underlay, also helps support sustainable landscaping efforts.

Further, any waste generated during removal or base correction (like old infill or compacted rock) should be disposed of according to local council guidelines.

Permits and Inspections in Melbourne

For most small residential artificial grass repairs, permits are not required.

However, if repairs involve excavation deeper than 600mm, interfere with stormwater systems, or alter natural gradients affecting drainage onto neighbouring properties, local regulations may kick in.

Melbourne councils may require pre-approval for significant works that alter ground surfaces. Projects near easements, tree protection zones, or nature strips might also need inspection or formal council notice before proceeding.

Assessing Your Property’s Needs

Before starting any repair, evaluate the area’s function and exposure. High-traffic zones such as pathways, play areas, or pet spaces require extra sub-base support compared to quieter corners.

Consider whether the sun exposure is harsh (which affects how the base behaves over time), and whether the area is prone to water pooling or soil movement. These factors will help determine whether a minor top-up or full base rebuild is required.

If multiple dips appear across the lawn, a comprehensive inspection of the entire area may be wise. Older homes may sit on shifting soils or poorly compacted fill, which can compromise structural support beneath the turf.

Choosing the Right Tools and Materials

Successful repairs rely on the right combination of equipment and base components. Skimping on tools can lead to uneven results or further sinking down the line.

Tools Required

• Shovel or trenching spade – for removing sunken turf sections and adjusting the base
• Compactor or hand tamper – ensures the new base layer stays firm and level
• Utility knife – for trimming turf edges if reshaping is needed
• Straight edge or spirit level – to verify evenness before relaying the turf
• Stiff broom or power broom – helps reset fibres and infill distribution post-repair

Materials You May Need

• Crushed rock (crusher dust or Class 3 base) – essential for a strong, stable foundation
• Fine river sand or silica sand – to top-dress the surface and support blades upright
• Weed mat (optional) – especially useful if the area was not previously lined
• Joining tape and turf adhesive – only needed if cuts or joins must be made

Using premium fill materials and compacting thoroughly will go a long way in extending the turf’s lifespan and avoiding future dips.

Base Material: Crushed Rock for Stability

A solid base is the backbone of any artificial turf system. When fixing sunken areas, the original base may have settled, washed away, or not been compacted properly in the first place. Rebuilding it with the right aggregate is essential.

Recommended Options

Look for Class 3 crushed rock or crusher dust — both are commonly used in synthetic turf installations. These materials compact well, allow for drainage, and create a firm surface.

RECOMMENDED: Artificial Grass Drainage Guide

Levelling Layer: Washed Sand or Silica Sand

Over the top of the compacted base, a fine layer of sand helps create a smooth, even finish and assists with blade support. For smaller repair patches, a 10–15mm layer is usually sufficient.

Best Picks

Use washed river sand or silica infill — both are soft underfoot and support the vertical structure of turf fibres.

Adhesion and Join Support

If repairing only a section, you may need to reconnect or re-secure the turf edges. High-quality join tape and glue make all the difference here.

Suitable Products

Opt for turf adhesive brands like TurfBond or SynLok — both engineered for Australian weather. For smaller joins, self-adhesive join tape offers a simpler application.

Pro Tip

Store adhesives out of direct sun and avoid application during rain or heavy humidity to ensure a strong, lasting bond.

Optional But Helpful Add-Ons

Weed Mat

Install under the repair area for added defence against future growth. Most turf suppliers in Victoria stock biodegradable or high-density options.

Infill Top-Up

Once the turf is relaid, brushing in additional infill helps restore blade alignment and adds cushion. Choose silica sand over rubber crumb for a more natural feel and less heat absorption.

Step 1: Inspect the Affected Area

Begin by identifying exactly where the sinking has occurred. Walk across the surface and note any soft spots, dips, or visible depressions. Mark the boundaries using chalk or temporary paint.

Step 2: Cut and Remove the Turf

Using a utility knife, carefully slice around the marked area. Fold the turf back or lift it completely, depending on the patch size. Be cautious not to damage fibres you intend to reuse.

Best Practice

Label each turf section’s orientation so it matches the original grain direction when replaced.

Step 3: Remove and Rebuild the Base

Excavate the sunken base layer down to stable ground. Remove loose soil or failed aggregate. Refill with crushed rock in 50mm layers, compacting firmly between each one using a hand tamper or plate compactor.

Step 4: Apply the Levelling Layer

Top the compacted base with 10–15mm of washed sand or silica. Rake smooth, then use a spirit level or timber screed to create a uniform, even surface.

Best Practice

Moisten the sand lightly before final compaction. This helps prevent later sinking and eases turf repositioning.

Step 5: Replace or Reattach Turf

Roll or place turf back into position, aligning the blades in the same direction as the surrounding grass. If sections were cut, apply join tape and adhesive where necessary.

Step 6: Add Infill and Brush the Blades

Sprinkle a layer of silica sand over the area and brush it into the fibres using a stiff broom or power broom. This helps the blades stand upright and stabilises the surface.

Step 7: Final Check and Clean-Up

Walk over the repaired area to ensure firmness. Re-check levels with a straight edge. Collect all waste, sweep surrounding pathways, and rinse down tools.

Know When to Call the Pros

If the problem affects drainage, multiple spots, or is near pipes or easements, hiring an experienced artificial turf installer will save time and prevent costly rework.

When in doubt, it’s worth consulting someone who installs professionally across Melbourne’s complex soil types.

Total DIY Project Range: $180–$350 for a 1–2m² repair

Key Takeaways:

• Sinking turf is usually caused by poor base prep, drainage issues, or ground movement.
• Repairs can be completed DIY-style with crushed rock, sand, and basic tools — but large or recurring issues may require expert help.
• Environmental factors and council regulations should be considered, especially with deeper works.
• Choosing quality materials — like Class 3 crushed rock and silica sand — ensures better outcomes.
• Hiring equipment rather than buying helps keep costs down for homeowners.
• Council grants may apply in select sustainability-related upgrades involving water management.

Don’t let a sunken patch undo the beauty and benefits of your synthetic lawn.

Whether you’re looking for expert guidance, premium materials, or a professional repair done right the first time, Reelgrass is here to help.

With over 15 years of experience and a passion for sustainable turf solutions, we make restoring your artificial lawn smooth, simple, and stress-free.

Contact Reelgrass today for personalised advice or a FREE quote to keep your lawn looking lush, year after year.