How to lay a concrete path

🧱 How to Lay a Concrete Path — A Practical DIY Guide for Australian Homes

What is involved in laying a concrete path in Australia?

A concrete path is one of the most durable and low-maintenance ways to improve access around your home, whether you are building a garden path, side access walkway, or connection between outdoor areas. For DIY homeowners, the job is very achievable over a weekend if you plan the levels properly, prepare a solid base, and finish the concrete at the right time.

This guide covers the full process from set-out and excavation through to pouring, finishing, and curing, with practical advice suited to Australian conditions. For standard domestic pathways, good preparation matters more than fancy finishing.

What skill level is required to lay a concrete path?

Intermediate — Estimated time: 1–2 days plus 5–7 days curing time before regular use

What tools are required for laying a concrete path?

What materials are needed to lay a concrete path?

Safety Requirements

Step-by-Step Guide

Step 1: 1️⃣ Plan the path layout and finished levels

Start by deciding the path width, route, and use. A comfortable garden or side path is usually 900–1200 mm wide, while a main access path may be 1200–1500 mm wide for easier movement.

Set a fall so water drains away from the house and does not pond on the surface. A good target is around 1:80 to 1:100 fall, which means about 10–12.5 mm drop per 1 m of path length. Use string lines and pegs to mark both edges and the finished height.

Check where the path will start and finish so it ties neatly into existing paving, a patio, driveway, or grass level. It is much easier to adjust heights now than after the formwork is in.

Step 2: 2️⃣ Excavate the area

Excavate the path area wide enough to fit the concrete plus formwork. For a typical path, remove enough soil to allow for:

That usually means a total excavation depth of about 150–200 mm below finished level, depending on your site and soil conditions.

Trim the bottom as evenly as possible and remove all loose soil, roots, organic matter, and soft spots. If the ground is clayey or unstable, spend extra time getting to firm material.

Step 3: 3️⃣ Install and compact the sub-base

Spread road base or crushed rock to a compacted depth of 75–100 mm. Compact it thoroughly using a plate compactor in multiple passes until it is firm underfoot and no longer shifts.

This stage is critical. A poorly compacted base is one of the main causes of cracked or uneven paths. Use your level and straightedge to shape the base so it already follows the finished fall of the path.

If you are working on reactive clay or an area that stays damp, it is worth being extra careful with drainage and compaction. The concrete is only as good as what sits underneath it.

Step 4: 4️⃣ Build and brace the formwork

Install straight form boards along both sides of the path, following your string lines. Timber such as 90 x 45 mm works well for most domestic paths, with pegs at regular intervals to stop movement during the pour.

Check the top of the formwork carefully because this sets the finished height of the concrete. Use a spirit level and measure down from the string line where needed.

Make sure the forms are:

If the path curves, flexible form ply or kerb form material can help achieve a cleaner line than forcing straight timber.

Step 5: 5️⃣ Place reinforcement and isolation joints

For standard domestic paths, reinforcement is strongly recommended even if it is not always strictly required. Use light reinforcement mesh such as SL62 on bar chairs so it sits roughly in the upper-middle portion of the slab, not on the ground.

If the path touches a house slab, wall, step, or other fixed element, install expansion joint foam between the concrete and that structure. This helps allow movement and reduces the chance of cracking where the two surfaces meet.

For simple garden paths, fibre-reinforced concrete can also help with crack control, though mesh still gives better placement control in many DIY jobs.

Step 6: 6️⃣ Order or mix the concrete

Estimate the concrete volume by multiplying:

Example: a path 10 m long x 1 m wide x 0.1 m thick = 1.0 m³ concrete.

For most paths over about 0.3–0.4 m³, ready-mix is usually better value and gives more consistent results than mixing bag by bag. For very small paths or repairs, bagged premix is fine.

If site mixing, use:

Only add enough water to achieve a workable mix. Too much water weakens the concrete, increases shrinkage, and leads to surface dusting and cracking.

💡 Hiring a mixer for a day is usually cheaper than buying one for a once-off job. For larger paths, ready-mix delivery often works out cheaper overall once labour and time are considered.

Step 7: 7️⃣ Pour and place the concrete

Wet the base lightly so it is damp but not muddy before the pour. Place concrete into the formwork starting at one end and work steadily along the path.

Use shovels or a rake to distribute the concrete evenly. Do not overwork it by dragging too much paste to the surface. If using mesh, lift it slightly during the pour so it stays positioned within the slab.

For a typical residential path, aim for a slab thickness of:

If the path may occasionally carry bins, garden equipment, or light machinery, the 100 mm thickness is the safer choice.

Step 8: 8️⃣ Screed, level, and compact the surface

Use a straight screed board resting on the form edges to strike off excess concrete. Move it in a sawing motion while pulling it along the path.

After screeding, use a bull float or hand float to smooth the surface and bring up a light cream. This helps close small voids and gives a more even finish.

At this stage:

Adding water during finishing weakens the top layer and often leads to dusting or scaling later.

Step 9: 9️⃣ Edge, joint, and finish the path

Once the surface begins to firm up, run an edging tool along the formwork edges to compact and round the perimeter. This reduces edge chipping.

Cut control joints to help manage shrinkage cracking. For a typical path, spacing joints at about 1.2–1.8 m apart is a practical rule for DIY work. Depth should be about one-quarter of the slab thickness, so a 100 mm slab should have joints around 25 mm deep.

Choose your final finish based on use:

For most outdoor paths, a broom finish is the safest and most durable choice.

Step 10: 🔟 Cure the concrete properly

Curing is essential for strength and crack control. Once the surface is firm enough, apply curing compound or cover the path with plastic sheeting to retain moisture.

Keep the concrete protected for at least 5–7 days. In hot, windy, or dry weather, curing is even more important because moisture can leave the slab too quickly.

As a general guide:

Avoid dragging tools, wheelbarrows, or heavy loads across the slab during early curing.

Step 11: 1️⃣1️⃣ Strip forms and tidy the edges

Once the concrete has hardened sufficiently, remove the formwork carefully so the edges are not damaged. Backfill the sides with soil, gravel, mulch, or turf as needed.

Check that water drains correctly and there are no low points holding moisture. If you want a cleaner final result, tidy the adjoining landscape immediately after stripping forms so the new path looks integrated rather than added on.

Common Mistakes to Avoid

Pro Tips

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