How to Remove and Replace Old Concrete Garden Kerbs

Concrete garden kerbs are a popular choice for defining garden beds, pathways, and driveways due to their durability and clean appearance. Over time, however, these kerbs can become cracked, stained, or simply outdated, prompting many homeowners to consider removing and replacing them. Whether you want to refresh your garden’s look or fix damaged kerbs, the process is straightforward if approached methodically. This article will guide you through the steps of safely removing old concrete garden kerbs and installing new ones.

Why Replace Old Concrete Garden Kerbs?

Before diving into the removal and replacement process, it’s worth understanding why you might need to replace your garden kerbs:

• Damage: Cracks, chips, and breaks can compromise both aesthetics and functionality.
• Shifting or sinking: Over time, kerbs may move due to soil erosion or freeze-thaw cycles.
• Staining and wear: Mold, moss, or discoloration can detract from your garden’s appearance.
• Design update: You may want a different style or material that better suits your landscaping.
• Safety: Broken edges can pose tripping hazards.

When these issues become noticeable, replacing your garden kerbs can restore neatness and define space effectively.

Tools and Materials Needed

Tools:

• Shovel or spade
• Crowbar or pry bar
• Hammer or mallet
• Chisel (optional)
• Wheelbarrow
• Gloves
• Safety goggles
• Dust mask (optional)
• Tape measure
• Spirit level
• String line with stakes (for alignment)

Materials:

• New concrete garden kerbs (precast blocks or cast-in-place concrete)
• Bedding sand or gravel
• Concrete adhesive (optional)
• Mortar mix (if required)
• Jointing compound or sand (for finishing)

Step 1: Prepare the Work Area

Clear away any plants, debris, or obstacles around the kerb line. This will give you easier access to the kerbs and prevent damage to surrounding vegetation. Wear gloves and safety gear to protect yourself from sharp edges and dust.

Step 2: Loosen the Old Kerbs

Most concrete garden kerbs are either set in mortar or bedded on compacted sand/gravel. To remove them:

1. Use a shovel to expose the base of the kerb by digging out soil around it.
2. Insert a crowbar between the ground/base material and the kerb.
3. Gently lever the kerb upwards. If it is mortared in place, apply steady pressure with a hammer on the crowbar to loosen it.
4. For stubborn pieces, use a hammer and chisel to break up any bonding mortar carefully.
5. Remove each piece one at a time and place them in your wheelbarrow for disposal.

Be cautious of underground utilities such as irrigation pipes or cables which could be damaged during digging.

Step 3: Remove Excess Mortar or Bedding

Once all old kerbs are removed, clear away any remaining mortar, sand, gravel, or debris from the trench where the new kerbs will sit. Use a shovel and broom to make sure the base is clean and even.

If the original bedding has eroded significantly, you may need to dig down slightly further to create a stable foundation.

Step 4: Inspect and Prepare the Base

The base needs to be stable and level for new kerbs:

• Check for proper drainage so water won’t pool under the kerbs.
• Compact loose soil using a tamper or by applying pressure with a heavy object.
• Add a layer of compacted hardcore (crushed stone) if necessary for additional support.
• Place a layer of bedding sand approximately 25-50mm thick on top of this base material.
• Level the sand using a straight edge or board.

This bedding layer cushions the kerb blocks and allows minor adjustments during placement.

Step 5: Set Out Your New Kerb Line

Use string lines anchored by stakes to mark straight lines where new kerbs will go. A tape measure helps maintain consistent spacing between individual blocks if applicable.

Check alignment frequently as you proceed to avoid curves or uneven gaps.

Step 6: Lay New Concrete Garden Kerbs

There are two primary installation methods depending on your chosen kerb type:

Method A: Dry Bedding with Sand

1. Place each kerb block onto the prepared bedding sand along your string line.
2. Tap each block gently with a rubber mallet to ensure it sits firmly but without cracking.
3. Use a spirit level on top of each block to verify horizontal alignment.
4. Adjust by adding or removing some bedding sand beneath individual blocks as needed.
5. Maintain consistent gaps between blocks (typically 3-5mm).

Once all blocks are laid:

• Sweep dry jointing sand into gaps between blocks.
• Compact the sand by brushing it down firmly so it fills joints completely.

Method B: Mortar Bedding

1. Mix mortar according to manufacturer instructions for strength appropriate for outdoor use.
2. Spread a bed of mortar approximately 20-30mm thick along your trench base.
3. Press each kerb into place on top of mortar bed while it is still wet.
4. Check levels frequently and adjust before mortar sets.
5. Fill joints between blocks with mortar using a pointing trowel.
6. Smooth joints for neat finish.

Mortar provides a more permanent setting but requires more skill in application.

Step 7: Finishing Touches

After set-up:

• Remove string lines carefully once blocks are secure.
• Backfill soil behind new kerbs if there is excavation space left between block backs and garden beds.
• Water-mist any mortar joints after initial drying period to help curing if dry weather persists.
• Clean any spilled mortar from block surfaces promptly before it hardens.

Step 8: Maintenance Tips for Longevity

To keep your new concrete garden kerbs looking great:

• Regularly clean dirt and moss off using mild detergent and soft brushes.
• Reseal joints with fresh jointing compound every few years if necessary.
• Avoid driving heavy vehicles over thin kerbing unsupported by proper foundations.
• Inspect annually for cracks or movement so repairs can be made early.

Conclusion

Removing old concrete garden kerbs may seem like an intimidating task initially but following these steps facilitates an efficient upgrade process that enhances both function and aesthetics of your outdoor space. With correct preparation, care in handling materials, and attention to detail during installation, your new garden kerbs will provide durable edges that beautify your landscape for many years ahead.

Whether you’re refreshing tired boundaries or completely redesigning your garden layout, replacing old concrete garden kerbs yourself is achievable with patience and basic DIY skills, saving money while transforming your property’s curb appeal in one simple project!