How to Fix and Flatten Lumpy Artificial Grass

Are bumps and lumps ruining your picture-perfect synthetic lawn? 

It’s frustrating discovering ripples in your once-flawless artificial turf. When you’ve swapped thirsty, chemical-heavy lawns for eco-friendly artificial lawns, you want to enjoy a smooth and lush lawn 365 days a year.

So if you’re looking for a smooth, safe and enjoyable space for your family and pets, you’re in the right place.

In this article, you’ll uncover how to identify causes of lumps, learn practical repair methods, and apply proven tips for keeping your synthetic grass smooth. From investigating drainage issues to levelling sub-bases, every key step will be explored in simple, clear language. 

Whether handling a small bump in a backyard play area or tackling a larger problem along a busy walkway, you’ll feel confident restoring that fresh, seamless look.

Artificial turf has transformed modern landscaping, replacing water-hungry traditional lawns with a greener, low-maintenance alternative.

Built from durable synthetic fibres designed to mimic real grass, this versatile product stays lush without constant mowing, watering, or fertiliser.

High-quality options also incorporate UV stabilisers, ensuring a vibrant appearance even after years under Melbourne’s intense summer sun.

Beyond visual appeal, synthetic lawns deliver impressive resilience against foot traffic, playful pets, and unpredictable weather. A cushioned base can support safe activity zones for children while resisting pests and weeds that plague natural grass.

When maintained correctly, artificial grass can transform backyards, balconies, or sporting areas into neat, inviting outdoor living spaces — without the burden of constant upkeep.

Assess Home and Site Requirements

Before lifting turf or adjusting its sub-base, carefully evaluate the problem area. Identify whether lumps come from shifting soil, tree roots, drainage failure, or simply incorrect installation.

Examine the ground underneath to check for pooling water, compacted patches, or uneven fill. Understanding exactly why an artificial lawn has buckled will help determine the best corrective approach, saving time and money.

Outdoor features around the turf also matter. Consider how kids, pets, or heavy foot traffic impact surface wear. Busy walkways or sporting spaces may demand denser, more resilient fibres than a light-use entertaining area.

Checking local weather exposure, shade patterns, and soil conditions will reveal crucial details that influence turf performance after repairs.

Essential Tools and Resources

Fixing lumps successfully means having a solid kit. Gather turf pegs, utility knives, joint tape, and seaming glue to realign edges or reconnect joins. Keep a stiff broom or power brush handy to refresh flattened fibres once the repairs finish.

A compacting plate or tamper helps reset crushed rock bases, while measuring tape and spirit level ensure a seamless, even result.

Sub-Base Repair Tools

If repairing deeper issues under the turf, line up wheelbarrows, shovels, and crushed rock. Adding a weed barrier or drainage mat prevents future problems.

In some cases, hiring a vibrating plate compactor for a day will create the smoothest, most durable foundation, particularly on high-traffic spots.

Step 1: Identify the Trouble Spots

Begin by walking the entire lawn surface, taking note of any soft, raised, or hollow-feeling zones. Press with a foot to gauge whether the lump results from loose sub-base, tree roots, or moisture pooling.

Mark each spot clearly to avoid missing hidden lumps once repairs begin.

Step 2: Lift the Grass Surface

Gently cut around marked problem zones using a sharp utility knife. Roll back the turf without stretching or tearing it. Move cautiously if older glue or nails still grip the base. Lift sections as wide as practical to minimise joins later.

Smaller patches risk creating visible seams.

Step 3: Repair the Sub-Base

Inspect the crushed rock or sand below. Rake out any uneven, clumpy areas. Top up low spots with fresh crushed rock, compact thoroughly with a vibrating plate or hand tamper. Confirm the repaired area is even using a level.

Drainage Reminder

Look for poor drainage, especially near downpipes or retaining walls. Fixing lumps without resolving water issues only guarantees new lumps later.

Step 4: Reset and Rejoin

Once the sub-base sits smooth, place the turf back down carefully. Trim edges so they overlap slightly for a tight seam. Apply outdoor-grade adhesive on the join tape beneath the overlap. Press together, weighting the seam gently until dry.

Pro Installer Alert

If entire rolls need lifting, or if lumps cover more than half the yard, consider a qualified turf installer. Professionals can re-level sub-bases with specialist machinery, protecting turf warranty coverage and saving frustration.

Step 5: Brush, Clean, and Inspect

Use a stiff broom or power brush to lift grass fibres upright. Check the whole repaired section for soft spots. Fix any fresh gaps with extra turf pegs. Clear leftover debris to keep children or pets safe while the repair cures.

Leave newly glued areas undisturbed for at least 24 hours to ensure proper bonding. Limit foot traffic, particularly from pets, until seams feel firm.

Small backyard lumps usually cost between $150–$500 to repair, while larger re-levelling might reach $1,500–$3,000 with professional help.

If bumpy patches have left your synthetic grass looking tired or uneven, don’t put up with it any longer.

Reelgrass offers expert guidance, from DIY tips to full-scale professional repairs, ensuring Melbourne homeowners get smooth, safe, and sustainable results every time.

Reach out today for a free, no-obligation quote or personalised advice tailored to your space.

1300 306 389 or request a free quote today to keep your synthetic grass smooth, safe and eye-catching.