How to install concrete edging: a complete DIY guide

For most DIY garden and driveway borders in Ireland, precast concrete edging stones are the faster, cheaper choice. Lay them in a weekend with basic tools and a bag of bedding mortar. Poured-in-place curbing is worth the extra effort when you need continuous curves, a flush mow-strip profile, or a finish that integrates with surrounding paving.

At a glance:

Precast units: roughly 1–2 hours per 10 m for a competent DIYer; materials typically cost €8–€18 per linear metre in Ireland depending on profile and supplier.
Poured-in-place: allow 3–5 hours per 10 m including mixing and finishing; better suited to curved runs and bespoke profiles, but demands more preparation and timing.

Concrete edging installation covers both paths well, and the sections below give you a complete workflow for each.

Key takeaways

Precast concrete edging is the fastest, most DIY-friendly method for most Irish garden and driveway borders; poured-in-place is worth the extra effort only when continuous curves or integrated finishes are the priority.

Point	Details
Choose precast for most jobs	Precast units take 1–2 hours per 10 m and suit straight runs and gentle curves.
Poured-in-place for curves	Use poured curbing with flexible formwork for radii under 900 mm or bespoke profiles.
Base preparation is critical	Compact a 50–75 mm gravel base; poor compaction causes heaving and cracking within two winters.
Seal every 2–3 years	An acrylic sealer applied after 28-day cure extends life and protects against Irish weather.
Poweraggregates for Irish supply	Order bagged concrete, gravel, kerbing, and paving products with nationwide delivery from Cork.

What tools and materials do you need for concrete edging installation?
Precast units or poured-in-place: which method suits your project?
How to install precast concrete edging stones: step by step
How to pour concrete edging in place: step by step
How do you lay concrete edging to curves and arcs?
Finishing, curing and maintaining your concrete edging
Common installation mistakes and how to avoid them
How much does concrete edging cost per metre in Ireland?
Where to buy concrete edging materials in Ireland
A practical perspective on concrete edging in Ireland
Poweraggregates supplies everything you need for your edging project
Sources
FAQ

What tools and materials do you need for concrete edging installation?

Getting your kit together before you start saves a mid-job run to the merchant. The list below covers both methods; tick off what you already own and hire the rest.

Tools:

Spade and flat-bladed edging spade for trench cutting
Tape measure, string line, and pegs for layout
Spirit level (1.2 m minimum) and line level
Rubber mallet for tapping units to grade
Pointing trowel and margin trowel
Wheelbarrow and mixing board or electric paddle mixer
Tamper or plate compactor (hire for runs over 10 m)
Bender board or flexible timber for poured formwork
Timber stakes (25 × 25 mm) and screws for securing forms
Angle grinder with diamond blade for cutting precast units
Jointing iron or edging tool for finishing poured concrete

Materials:

Precast concrete edging units (straight and curved sections as needed)
Bagged sharp sand or fine gravel for the base layer
Bedding mortar or concrete mix (C20 equivalent for haunching)
Ready-mix concrete if pouring runs over 6 m
Rebar (10 mm) or wire mesh for reinforcement in poured sections
Concrete adhesive or mortar for precast joints
Acrylic concrete sealer for finishing
Plastic sheeting for curing

For a standard 100 mm × 200 mm precast border, you need roughly one 25 kg bag of bedding mortar per 3–4 linear metres. For haunching, a 25 kg bag of C20 mix covers approximately 1–1.5 linear metres at a standard 150 mm haunch.

Pro Tip: Hiring a 140-litre electric cement mixer for a day costs around €40–€60 from most Irish tool hire companies. For poured runs over 4 m, it pays for itself in time and consistency alone. Ask your local hire centre about weekend rates.

Precast units or poured-in-place: which method suits your project?

The right choice depends on your site, your skill level, and how permanent you want the result to be.

Concrete landscape borders offer long life and low maintenance compared with plastic or timber, but the upfront cost and method complexity vary significantly between precast and poured-in-place.

Choose precast concrete edging units when:

Your run is mostly straight or uses gentle curves
You want to complete the job in a single weekend
You are working alone without a helper
Budget is tight and you want predictable material costs
You may need to relay sections later (precast is removable)

Choose poured-in-place curbing when:

You need tight, continuous curves or a radius under 600 mm
You want a flush mow-strip profile that a mower wheel can ride
You are integrating the edging with an existing paved surface
You want a bespoke stamped or exposed-aggregate finish
The run is long enough to justify formwork time (typically over 6 m)

Site factors that affect both methods:

Soil type: Clay soils heave in frost. Both methods need a compacted gravel base, but poured curbing on clay benefits from deeper haunching.
Slopes: Stepped precast units handle gradients more easily than a continuous poured pour, which needs careful form levelling.
Tree roots: Avoid setting edging directly over surface roots. Roots will lift any edging within a few seasons regardless of method.
Underground services: Check with your local utility provider before digging. In Ireland, Safe Electric and Gas Networks Ireland both offer guidance on safe dig depths.

Extruded curbing, where a machine extrudes a continuous profile on site, is the fastest professional method and can lay 60–120 linear metres per day. That speed requires specialist equipment and is not a realistic DIY track for most homeowners.

How to install precast concrete edging stones: step by step

This workflow suits garden borders, driveway edges, and path margins using standard precast units.

Mark the line. Drive timber pegs every 1.5–2 m along the planned edge and run a string line at finished edging height. For curves, use a garden hose to mark the arc on the ground before pegging.
Excavate the trench. Dig to a depth of 100–150 mm below finished surface level, plus the height of your edging unit. A standard 200 mm-tall precast border needs a trench roughly 300 mm deep to allow for base and haunching. Width should be the unit width plus 100 mm each side for haunching.
Compact the base. Lay a 50 mm layer of compacted sharp sand or fine gravel. A compacted gravel base of 50–75 mm is recommended for drainage and stability beneath a concrete edge. Tamp firmly; any soft spots will cause settlement later.
Lay a bedding mortar. Mix a stiff bedding mortar (4:1 sharp sand to cement) and lay a 25–40 mm bed along the trench base. Do not make it sloppy; a firm mix holds the unit in position while you tap it level.
Set the first unit. Place the edging stone on the mortar bed and tap it down with a rubber mallet until it aligns with your string line and sits at the correct height. Concrete-bedded edgings and kerbs should be tapped to the required level using a rubber mallet, not a steel hammer, which can chip the unit face.
Continue along the run. Butt each subsequent unit tightly against the last. For straight runs, a 3–5 mm mortar joint between units is acceptable and allows for minor alignment adjustment. Use corner and radius units at changes of direction.
Haunch both sides. Once a section of 2–3 m is set and checked for level, fill both sides of the trench with a concrete haunch mix (C20 equivalent). The haunch should extend at least 75 mm up each face of the unit and be 75–100 mm wide at the base. This is what actually locks the edging in place.
Check and adjust. Before the haunch stiffens, re-check your string line and level. Tap any high units down. Once the haunch sets, correction is very difficult.
Backfill and finish. After 24 hours, backfill behind the edging with topsoil or compacted aggregate. Brush any mortar splashes off the unit face while still fresh.

Pro Tip: For a mow-strip profile with precast units, set the edging so its top sits 5–10 mm below lawn level. A mower wheel rides on the concrete face, and you eliminate most string-trimming along the border. Pair this with decorative stone on the bed side for a clean, low-maintenance finish.

How to pour concrete edging in place: step by step

Poured-in-place curbing takes more preparation but gives you a continuous, seamless edge with no joints to open up over time.

Safety note: Wet concrete is alkaline and can cause skin burns. Wear nitrile gloves, safety glasses, and waterproof boots throughout. Wash any splashes off skin immediately with clean water.

Mark and excavate. Set out the line as above. For a standard 100 mm-wide × 150 mm-tall poured edge, excavate a trench 250–300 mm wide and 200 mm deep to allow for base, the pour itself, and haunching on the outer face.
Prepare the base. Lay and compact a 75 mm layer of sharp sand or fine gravel. For poured mow strips, a 75 mm compacted base is the standard recommendation. Tamp thoroughly; poured concrete transfers load directly to the sub-base.
Build the formwork. For straight runs, use 150 mm × 25 mm timber planks staked every 600 mm. For curves, use flexible hardboard or bender board, wetting it first to prevent splitting. Stake the outer form at 300 mm intervals on tight curves. The form height sets your finished edge height, so check it against your string line before pouring.
Add reinforcement. For runs over 3 m, lay a single 10 mm rebar along the centre of the form, supported 50 mm off the base with small aggregate pieces. This dramatically reduces cracking on longer sections.
Mix or order concrete. For short runs (under 6 m), a C20 bagged mix works well. A standard 25 kg bag yields roughly 0.011 m³ of mixed concrete; a 100 mm × 150 mm profile uses approximately 0.015 m³ per linear metre, so you need around 1.5 bags per metre. For runs over 6 m, ordering ready-mix concrete saves time and gives a more consistent result. Specify a C20 mix with a medium slump, 75–100 mm, for hand-placed edging.
Pour and consolidate. Pour concrete into the form in one continuous pass where possible. Use a trowel or piece of rebar to consolidate the mix and eliminate air pockets against the form faces. Overfill slightly, then screed level with the form top.
Finish the surface. Run an edging iron along both top edges to create a rounded arris. For a broom finish, drag a stiff brush lightly across the top. For exposed aggregate, seed the surface with decorative stone and press in gently, then brush and wash the surface once the concrete has stiffened.
Cut control joints. For runs over 3 m, cut control joints every 1.5–2 m with a grooving tool while the concrete is still green (within 1–2 hours of pouring). This gives the concrete a planned crack line rather than a random one.
Cure the concrete. Cover with plastic sheeting immediately after finishing and keep it in place for at least 3 days. In warm or windy Irish summer conditions, mist the surface lightly before covering to slow moisture loss.
Strip the forms. Remove formwork after 24–48 hours. Backfill and compact behind the edge once the concrete has reached full strength at 28 days.

Pro Tip: For neat radii on curves, cut the bender board into 300 mm sections and overlap them slightly around the arc rather than trying to bend a single long board. Stake each section individually. The result is a smoother, more consistent curve than a single forced bend.

How do you lay concrete edging to curves and arcs?

Curves are where most DIY edging projects go wrong. The fix is almost always in the preparation, not the pour.

Mark the arc first. Tie a string to a central peg and sweep the arc with a can of line-marking spray or sand. For compound curves, use a garden hose and adjust until the line looks right from a standing position, then mark it.
Choose the right unit or method. Precast manufacturers supply purpose-made radius units in common curves (typically 600 mm, 900 mm, and 1,200 mm inside radius). For tighter curves, poured-in-place with flexible formwork is more practical than cutting straight precast units.
For precast on gentle curves. Angle straight units slightly at each joint, leaving a small wedge gap at the outer face. Fill the gap with mortar. This works for curves with an inside radius of 900 mm or more. Below that, use radius units or switch to poured-in-place.
For poured curbing on curves. Set control points every 300–400 mm around the arc and stake the bender board to each point. Check the line from 5–6 m away before pouring; small deviations look much larger once the concrete is set.
Reinforce all curved sections. Curves put lateral stress on the concrete as it cures and settles. Always include rebar or mesh in poured curved sections, even on short runs.
Allow for form flex. Wet your bender board 30 minutes before bending. Dry board splits on tight curves and leaves a rough form face that transfers to the finished concrete surface.

Pro Tip: On a tight inside curve, cut a series of shallow relief cuts (about halfway through the board thickness) on the inner face of the bender board every 50–75 mm. The board bends cleanly without splitting, and the relief cuts are on the non-visible face of the form.

Finishing, curing and maintaining your concrete edging

Getting the finish right is a 30-minute job that determines how the edging looks for the next 20 years.

Finishing options:

Rounded arris: Run an edging iron along both top edges immediately after screeding. Softens the look and reduces chipping.
Broom finish: Drag a stiff brush across the top surface for grip and a natural texture.
Exposed aggregate: Seed with decorative stone, press in, then wash the surface with a soft brush once the concrete stiffens. Pairs well with garden stone designs on the bed side.
Stamped finish: Press a rubber stamp into the surface while still plastic. Requires a release agent to prevent sticking.

Curing:

Cover with plastic sheeting within 20 minutes of finishing.
Keep covered for a minimum of 3 days; 7 days gives noticeably better strength.
In cold Irish weather (below 5°C), use hessian under the plastic and avoid pouring at all if frost is forecast within 48 hours.
Precast units are factory-cured, so no on-site curing is needed; just protect mortar joints from rain for 24 hours.

Sealing:

Sealing concrete edging with an acrylic sealer every 2–3 years improves the finish and protects against moisture and weathering, extending the life of the curb. Apply the first coat after the concrete has cured for at least 28 days. Use a low-pressure sprayer or roller and apply two thin coats rather than one heavy one.

Routine maintenance:

Brush off moss and algae with a stiff brush in spring; treat with a dilute patio cleaner if needed.
Check mortar joints on precast runs annually and repoint any that have opened up.
Inspect for cracking after the first winter. Hairline cracks under 1 mm are cosmetic; wider cracks need filling with a flexible concrete repair mortar before water ingress causes further damage.

Pro Tip: Apply sealer on a dry day when the temperature is above 10°C and rain is not forecast for 24 hours. Irish weather makes this a narrow window; check the forecast the night before.

Common installation mistakes and how to avoid them

Most edging failures trace back to one of five errors, all of which are easy to prevent.

Shallow trench. If the trench is too shallow, the haunch has nowhere to go and the edging rocks. Minimum trench depth is the unit height plus 100 mm for base and haunching.
Poor compaction. A soft base settles unevenly. Compact the gravel layer in two passes with a tamper, not just a foot stamp.
Wrong mix consistency. Bedding mortar that is too wet slumps under the unit weight and makes level-setting impossible. The mix should hold its shape when squeezed in a fist.
Skipping control joints. On poured runs over 3 m, skipped control joints mean random cracking within the first winter. Cut them every 1.5–2 m while the concrete is still green.
Working near tree roots. Surface roots lift edging within 2–3 seasons. Either route the edging around the root zone or accept that section will need relevelling.

If your edging is heaving or rocking after the first winter: dig out the affected section, check the base for soft spots, recompact with fresh gravel, and relay. Do not simply re-mortar over a moving unit; the movement will reopen any new joint within months. On clay soils, consider deepening the gravel base to 100 mm and adding a geotextile membrane beneath it to prevent clay migration into the drainage layer.

Working near utilities and on slopes:

Always call your utility provider before digging more than 300 mm. On slopes, lay precast edging in steps rather than on a continuous gradient; this prevents units from sliding before the haunch sets. For poured curbing on a slope, work from the bottom up so fresh concrete does not flow downhill inside the form.

How much does concrete edging cost per metre in Ireland?

The figures below are indicative DIY material costs for Ireland. Professional installed costs in the US market range from $3 to $15 per linear foot depending on style, which gives a useful relative comparison even if the absolute figures differ in the Irish market.

Quantity rules of thumb:

One precast unit (typically 500 mm long) covers 0.5 linear metres; you need 2 units per metre.
A 100 mm × 150 mm poured profile uses approximately 0.015 m³ of concrete per linear metre.
For a 10 m run of poured edging, order 0.2 m³ of ready-mix or roughly 18–20 bags of 25 kg C20 bagged mix.

Short poured runs under 6 m are realistic for a competent DIYer with a wheelbarrow mixer; precast borders are installable by one person over a weekend regardless of run length.

Where to buy concrete edging materials in Ireland

Precast edging units and concrete products:

Poweraggregates concrete blocks and kerbing stocks kerbing and concrete edging products with nationwide delivery from Cork.
Large builders’ merchants (Chadwicks, Heiton Buckley, and similar national chains) carry standard precast edging units in common profiles.
Local concrete product manufacturers often supply direct; search “precast concrete edging” plus your county for regional options.

Ready-mix concrete:

Ready-mix is available from regional batching plants across Ireland. When ordering, specify:

Strength: C20 for standard edging; C25 if the edging is adjacent to a trafficked driveway.
Slump: 75–100 mm for hand-placed edging (ask for “medium workability”).
Volume: round up to the nearest 0.25 m³; most plants have a minimum order of 1 m³.
Access: give the plant your site address and confirm whether an 8-wheel truck can reach the pour point, or whether you need a smaller agitator.

Aggregates and base materials:

For sharp sand, fine gravel, and drainage stone for your trench base, Poweraggregates supplies bulk and bagged options with delivery across Ireland. Choosing the right gravel for your base layer matters more than most DIY guides acknowledge; a well-graded sharp sand compacts more firmly than a rounded building sand and gives a more stable bed.

Tool hire:

Most national tool hire chains (Speedy, Hire Station, and local independent hire centres) carry plate compactors, electric mixers, and diamond blade grinders. Book at least 48 hours ahead for weekend slots, particularly in spring and summer.

Pro Tip: Order your aggregates and bagged concrete at the same time from Poweraggregates to consolidate delivery costs. A single pallet delivery of mixed products is almost always cheaper than two separate drops, and the team can advise on quantities if you give them your linear metre count and profile dimensions.

A practical perspective on concrete edging in Ireland

Most how-to guides treat concrete edging as a purely technical exercise. In practice, the biggest variable is not the mix ratio or the haunch depth; it is the Irish weather.

Concrete does not like being poured in the rain, and it particularly dislikes the combination of a cold morning pour followed by an unexpectedly warm afternoon. That temperature swing accelerates surface drying while the core is still curing, and the result is surface crazing that no sealer will fully hide. The fix is simple: check the 48-hour forecast before you commit to a pour, and schedule poured-in-place work for a dry spell of at least two days. April and May tend to offer the most reliable windows in Ireland, with lower wind speeds than March and less summer heat stress than July.

The other thing most guides understate is how much the base preparation matters relative to everything else. A perfectly mixed pour on a poorly compacted base will crack within two winters. A slightly rough finish on a well-compacted, properly haunched base will still be sitting straight in fifteen years. Spend the extra 30 minutes on the base; it is the part of the job nobody sees and the part that determines everything.

For precast work specifically, the temptation is to skip the haunching and rely on backfill alone. Do not. The haunch is what converts a row of stones into a structural edge. Without it, a single frost cycle or a heavy wheelbarrow crossing the edge will shift a unit out of line.

One trade shortcut worth knowing: mix your haunching concrete slightly stiffer than you think you need. A stiff haunch holds the unit face plumb while it sets; a wet haunch slumps away from the unit and leaves a gap that fills with water and freezes.

Poweraggregates supplies everything you need for your edging project

Getting materials from multiple suppliers adds cost and delays. Poweraggregates stocks the full range for DIY concrete edging in Ireland: bagged concrete mixes, sharp sand, drainage gravel, decorative aggregates, concrete blocks and kerbing, and paving catalogues covering precast edging profiles in common sizes.

Delivery runs nationwide from Cork, in bulk or bagged quantities, so you can order exactly what your project needs without overbuying. The team can advise on quantities, mix specifications, and base materials if you give them your run length and profile. Browse the full range at the Poweraggregates shop or call to get a quote and confirm delivery to your area.

Sources

FAQ

How do you install concrete edging yourself?

Excavate a trench to the unit height plus 100 mm, compact a 50–75 mm gravel base, lay a stiff bedding mortar, set precast units to a string line, and haunch both sides with C20 concrete. For poured-in-place, build formwork, pour a C20 mix, finish the surface, cut control joints every 1.5–2 m, and cover with plastic for at least 3 days.

How do you secure concrete edging so it does not move?

The haunch is what secures it. Fill both sides of the trench with a C20 concrete mix extending at least 75 mm up each face of the unit. Bedding mortar alone is not enough; without a proper haunch, frost and ground movement will shift units out of line within a season or two.

What is the 3-inch edging rule?

The 3-inch (75 mm) rule refers to the minimum recommended depth of the compacted base layer beneath a concrete edge. A base shallower than 75 mm does not drain adequately and is prone to frost heave, particularly on clay soils common in many parts of Ireland.

Is concrete edging worth it for an Irish garden?

Yes, for permanent borders. Concrete edging outlasts plastic and timber alternatives, requires minimal maintenance once sealed, and holds its line through freeze-thaw cycles. The higher upfront cost pays back over time, particularly when paired with low-maintenance materials like decorative gravel or artificial grass on the bed side.