Experts in Concrete Patio edge installation

How to Install Edging Blocks Around a Concrete Patio

Well-installed edging blocks not only improve the appearance of your concrete patio but also stabilise its edges and prevent chipping. Whether you're using concrete, stone, or decorative blocks, the right installation is key to achieving a lasting finish.

In this guide, we'll walk you through preparation, correct positioning, setting techniques, drainage considerations, and finishing touches to ensure your patio edge is both functional and beautiful.

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Why Edging Blocks Matter for Patio Longevity

Edging blocks serve more than decorative purpose,they provide structural integrity, prevent damage, and help manage water. Here are five reasons they’re essential for a long-lasting patio.

Prevent Edge Cracking and Chipping

Sharp patio corners are vulnerable and prone to chipping from foot traffic or garden maintenance. Edging blocks absorb impact and protect the concrete, especially when driven past or near the perimeter.

Stabilise the Patio Edge

Without a solid boundary, the outer slab edges can shift or settle over time. Properly set edging blocks restrain the concrete and maintain slab alignment, reducing unevenness and preventing slump.

Enhance Drainage Control

Edging blocks can be aligned to direct water away or toward drains, helping to manage run-off. They support the patio’s fall and prevent washout of bedding material under slabs.

Define the Patio’s Look

A clean edge frames the patio visually and complements the styl,whether a sleek modern border or a rustic stone finish. It creates a crisp transition to lawn, decking, or planting beds.

Allow for Frost and Soil Movement

Edging blocks can be set with slight gaps and flexible joints to absorb freeze–thaw expansion and minor soil shift,important in UK climates with clay-rich soils.

Step‐by‐Step Installation of Patio Edging Blocks

1. Plan Alignment and Drainage

Mark the patio perimeter using chalk or string line to ensure straight edges.
Check patio fall (usually 1:80) so water runs awa,adjust block placement accordingly.
Plan drainage outlets and ensure no block impedes water flow.

2. Excavate and Create a Solid Bed

Dig a trench approximately 150 mm wide and 100 mm deep alongside the patio.
Fill with compacted MOT Type 1 or crushed stone; top with sand for levelling.
Ensure the bedding is firm and level before placing blocks.

3. Lay and Level Each Block

Start at highest point or corner and lay edge blocks with mortar bed.
Use a spirit level on each block for height and alignment; adjust as needed.
Tap gently with a rubber mallet to seat; maintain consistent joint spacing of at least 5 mm.

4. Install Flexible Joint Filler

Run a bead of exterior-grade flexible sealant or compressible joint filler between blocks and patio.
This allows movement from frost or thermal expansion without cracking.
Tool and smooth the sealant for a neat appearance and full seal.

5. Backfill and Compact Edge Zone

Fill the back of the trench with topsoil or gravel, compacting firmly to support blocks.
If bordered by planting, add a layer of weed mat and mulch before planting.
Check alignment and levels again after backfilling; re‑seat any blocks that have moved.

6. Final Clean and Seal

Once mortar and sealant have cured (at least 24 hours), clean with a mild detergent solution.
Apply a compatible joint sealer if recommended by the block manufacturer.
Inspect edges periodically, re‑seal flexible joints every 3–5 years to maintain integrity.

Frequently Asked Questions

You can, but mortared blocks provide greater stability and prevent movement. Dry-laid blocks are suitable for decorative borders but may shift over time unless the base is perfectly compacted.

Typically 100–150 mm deep for most edging blocks. The depth ensures over half the block is supported for frost protection and structural stability.

Use compacted MOT Type 1 or crushed stone for drainage and strength. Add a 20–30 mm sand levelling layer if blocks require a mortar or sand bed.

Yes, include flexible sealant or compressible filler between blocks and patio to absorb movement and prevent cracking caused by frost or ground shifts.

Absolutely. Just backfill with soil, add weed membrane, and allow sufficient gap (30–50 mm) between block and plant area for root growth and maintenance access.