What tools do I need for form up and pour concrete footings for a retaining wall?

This guide includes a comprehensive tools list. Key building & construction tools are detailed in the Tools Required section.

What is the Australian standard for retaining wall footing design?

The Australian standard for concrete retaining wall footing design is primarily AS 3600:2018 Concrete Structures and AS 3700:2018 Masonry Structures. These standards dictate minimum concrete strength, reinforcement detailing, and cover requirements. For residential applications, AS 2870:2011 Residential Slabs and Footings may also be relevant, especially concerning soil classifications and reactive soils.

How deep should a retaining wall footing be in Australia?

The depth of a retaining wall footing in Australia is determined by an engineer based on soil conditions, wall height, and surcharge loads. According to AS 2870:2011, footings must extend into stable bearing material, typically below the zone of seasonal moisture change. Local council regulations in states like Queensland often specify minimum depths, such as 450mm below natural ground level, but engineer's designs always take precedence.

What concrete strength is typically used for retaining wall footings?

For retaining wall footings in Australia, a minimum concrete strength of 25 MPa (N25) is commonly specified by engineers, though 32 MPa (N32) is often used for increased durability and load capacity. This is in accordance with AS 3600:2018. The specific strength and slump (e.g., 100mm ± 20mm) will be detailed in the engineer's design documentation.

How to form up and pour concrete footings for a retaining wall

Skill level: Advanced
Time: 1–3 days depending on wall length, excavation access, reinforcement complexity, inspection requirements, and concrete volume
Trade: Building & Construction
Updated: 4 November 2026

Tools you will need

String line, profiles, line pins, and marking paint for set
Tape measure minimum 8 m and builder’s square
Excavator or mini
Plate compactor for subgrade preparation where specified
Circular saw or drop saw for cutting formwork timber
Reinforcement cutters, rebar bender, and tie wire nips
Concrete vibrator or pencil vibrator for consolidation
Wheelbarrows, concrete rakes, shovels, and buckets
Water source and hose for clean

🧱 How to Form Up and Pour Concrete Footings for a Retaining Wall

What is involved in forming and pouring concrete footings for a retaining wall?

Forming up and pouring concrete footings for a retaining wall is a routine but critical structural task that directly affects wall alignment, load capacity, drainage performance, and long-term durability. On Australian residential sites, footing design must match soil conditions, wall height, surcharge loads, drainage detail, and the engineer’s documentation, with concrete and reinforcement installed in accordance with AS 3600, AS 3700, and relevant state and council requirements.

What skill level is required for concrete retaining wall footings?

Advanced — Estimated time: 1–3 days depending on wall length, excavation access, reinforcement complexity, inspection requirements, and concrete volume

What tools are essential for concrete retaining wall footings?

Laser level or rotary laser with staff for setting finished footing levels and checking excavation depth

String line, profiles, line pins, and marking paint for set-out

Tape measure minimum 8 m and builder’s square

Excavator or mini-excavator for trenching, with shovels and trenching spades for clean-up

Plate compactor for subgrade preparation where specified

Circular saw or drop saw for cutting formwork timber

Hammer, impact driver, nail gun or drill/driver for form assembly

Formwork stakes, star pickets, clamps, screws, nails, and bracing timber

Reinforcement cutters, rebar bender, and tie wire nips

Reo chairs, bar chairs, spacers, and cover blocks to maintain specified cover

Concrete vibrator or pencil vibrator for consolidation

Screed board, magnesium float, steel trowel, and edging tools as required

Wheelbarrows, concrete rakes, shovels, and buckets

Concrete pump access equipment or chute access planning depending on site

Water source and hose for clean-up only, not for uncontrolled mix adjustment

PPE including gloves, eye protection, hearing protection, respirator for cutting, hard hat, high-vis, long sleeves, and steel-cap boots

What materials are needed for concrete retaining wall footings?

Concrete to engineer’s specification, typically 20 MPa–32 MPa depending on design and exposure classification

If site-mixing is approved for minor non-structural work only: 1:2:3 general purpose or 1:1.5:2.5 structural, noting engineered footings are normally supplied as premixed batched concrete

Reinforcement bars and trench mesh to engineer’s schedule, including laps, starter bars, dowels, and ligatures if required

Tie wire for reinforcement fixing

Formwork timber, commonly 90 mm x 45 mm or 140 mm x 45 mm with ply or suitable form boards as required by footing depth

Timber pegs, stakes, braces, and kickers

Vapour barrier only if specifically detailed; generally not used in open strip footings unless shown on documents

Crushed rock or compacted road base/blinding layer if specified

Drainage provisions adjacent to wall footing as per design, including ag pipe, drainage gravel, and geotextile where required

Starter bars, cast-in bolts, or embedments if required for retaining wall system

Bond breaker or form release agent

Curing compound, plastic sheeting, or wet hessian for curing

Survey pegs and set-out markers

Non-shrink grout if specified for post-installed components or base corrections

Safety Requirements

Structural footing dimensions, reinforcement, founding depth, and concrete strength must follow engineer’s drawings and certification; do not vary sizes or steel on site without approval

Excavations must be assessed for collapse risk, underground services, water ingress, and safe access; trench support may be required depending on depth and soil conditions

Dial Before You Dig / Before You Dig Australia checks must be completed before excavation

Manual handling controls are required for reinforcement, formwork, and cement products

Use appropriate PPE: gloves, safety glasses, hearing protection, hard hat, high-vis clothing, long sleeves, and steel-cap boots

Wet concrete is caustic; prevent skin contact and wash off immediately

Scaffolding, edge protection, and fall prevention are required where working near drop-offs or retained edges

Waterproofing interfaces and drainage details associated with the wall system must comply with AS 3740 where applicable to adjoining building elements

Concrete works and reinforcement placement should be inspected prior to pour where required by certifier, engineer, or council

Step-by-Step Guide

Step 1: Set out the footing location and levels

1️⃣ Confirm design and engineer’s details

Review the retaining wall drawings, footing schedule, and site levels before any ground is broken. Confirm footing width, depth, reinforcement size, lap lengths, cover requirements, wall position relative to the footing centreline, and any step-downs for sloping ground.

Mark the wall alignment with string lines and profiles offset clear of excavation. Use a laser level to establish the top of footing, underside of footing, and any grade changes. On stepped walls, set each footing segment to the nominated level so the wall system can be laid accurately without packing or excessive mortar adjustment.

Where the retaining wall carries surcharge from driveways, buildings, pools, or boundaries, verify that the footing detail matches the surcharge condition. If conditions on site differ from the documentation, stop and seek updated engineering.

Step 2: Excavate to the required founding level

2️⃣ Prepare the trench and founding material

Excavate the trench to the engineer’s nominated footing dimensions and founding depth. Keep the trench base level, firm, and free of loose spoil, organic matter, soft pockets, and standing water.

Trim by hand to avoid over-excavation. If the trench is cut too deep, do not backfill with loose soil. Rectification generally requires compacted approved fill or additional concrete to engineer approval. The footing must bear on competent natural ground or approved compacted founding material.

For sloping sites, form stepped excavations rather than running an uneven trench base. Step lengths and risers should suit the wall system and drawings. Maintain sufficient trench width for formwork, reinforcement placement, and concrete consolidation.

If groundwater, reactive clay, or poor founding material is encountered, notify the engineer before proceeding. Unexpected ground conditions are common causes of footing failure.

Step 3: Compact and prepare the base

3️⃣ Establish a clean, stable bearing surface

Compact the trench base where the specification requires it and where access allows. In some footing trenches bearing on undisturbed natural material, the key requirement is a clean, firm founding surface rather than aggressive compaction.

Install a thin blinding layer if specified to provide a clean working surface and maintain reinforcement cover. This can improve set-out accuracy and stop steel sinking into soil during the pour.

Recheck trench levels with the laser. Tolerances matter: an uneven base can reduce minimum footing depth or cause excessive concrete consumption. Make sure all corners, returns, and step-downs are cut square and true.

Step 4: Form up the footing

4️⃣ Build rigid, line-true formwork

Where the ground can act as one face of the footing, form only the exposed side if permitted by the design and soil stability. For fully formed footings, install both sides of formwork using straight timber and stakes at regular centres sufficient to resist concrete pressure.

Set the form tops to the correct level and brace them so they cannot spread, bow, or kick during the pour. Use string lines to maintain alignment, especially on long runs. Check internal footing width at regular intervals and at all corners.

Apply form release agent where needed. Leave provision for key joints, starter bars, dowels, or embedments required by the retaining wall system. If the wall stem, block cores, or posts need starters, locate them accurately now rather than drilling later unless the system specifically allows post-installed anchors.

On stepped footings, ensure each vertical step is firmly boxed and braced. Poorly supported step forms commonly blow out during pouring.

Step 5: Install reinforcement to specification

5️⃣ Fix steel with correct cover and laps

Place reinforcement exactly as shown on the engineer’s drawings. This may include trench mesh, longitudinal bars, N-bars, ligatures, starter bars, and dowels for wall connection.

Support all steel on bar chairs or cover blocks to maintain the specified concrete cover from the trench base and form faces. Do not allow reinforcement to sit directly on soil, rock, or timber offcuts. Maintain bar spacing and lap lengths as documented.

Tie intersections securely with tie wire so the cage remains stable during the pour. Confirm cover at sides, bottom, and top, particularly in narrow footings where steel can drift during placement. Reinforcement tolerances are critical for durability and structural performance under AS 3600.

If using starter bars for masonry retaining walls, ensure spacing aligns with core centres or wall geometry. For segmental systems with reinforced concrete footings, verify the wall supplier’s minimum footing tolerances.

Step 6: Complete pre-pour checks and inspection

6️⃣ Verify before concrete arrives

Before ordering the pump or allowing the truck on site, carry out a full pre-pour inspection. Check:

Footing width and depth

Alignment to string line

Levels across the full run

Reinforcement size, placement, laps, and cover

Form bracing and stake security

Cleanliness of trench and forms

Starter bar locations and embedments

Access for chute, pump hose, and workers

Drainage penetrations or sleeves if required

Arrange engineer or certifier inspection if required. Photograph reinforcement and set-out before the pour for records. On larger sites or engineered jobs, a documented hold point is good practice.

Step 7: Pour the concrete

7️⃣ Place concrete evenly and without segregation

Use premixed concrete of the specified strength and slump. Most retaining wall footings on residential jobs are poured from truck chute where access allows, otherwise use a line pump or boom pump. Avoid dropping concrete excessively, which can cause segregation.

Place the concrete progressively along the footing in manageable sections. Do not dump large heaps in one spot and drag them long distances. Use a concrete vibrator carefully to consolidate around reinforcement, corners, step forms, and starter bars. Do not over-vibrate, as this may cause segregation and slurry loss.

Keep checking forms during the pour for movement or bulging. If a form starts to spread, stop placing, brace it immediately, and correct the level if possible.

Bring the footing to the required level and screed off the top. For walls requiring accurate base tolerance, finish the top clean and true. If the wall system needs a roughened construction surface for a later pour, finish accordingly rather than over-trowelling.

Step 8: Finish, cure, and protect the footing

8️⃣ Control curing and early-age damage

Once screeded, check levels again while the concrete is still workable. Reposition any starter bars to final alignment before initial set. Clean exposed reinforcement and remove splashed concrete from forms and adjacent work.

Begin curing as soon as the surface condition allows. Apply curing compound or cover with plastic sheeting or wet hessian to reduce rapid moisture loss. Proper curing improves strength gain, surface durability, and crack control.

Protect the footing from foot traffic, impact, washout, and premature loading. Do not commence wall construction until the concrete has gained sufficient strength for the wall system and engineer’s requirements.

Step 9: Strip forms and prepare for wall construction

9️⃣ Confirm tolerances before building above

After the concrete has cured sufficiently, strip the formwork carefully without damaging edges. Inspect the footing for honeycombing, blowouts, misalignment, inadequate cover exposure, or level deviations.

Patch minor defects only in accordance with accepted repair procedures. Significant defects such as undersized sections, major honeycombing, or misplaced starters should be referred to the engineer before continuing.

Set out the wall on the finished footing and verify that dimensions suit the selected retaining wall system, whether masonry block, sleeper post, in-situ concrete, or reinforced core-filled blockwork under AS 3700.

Common Mistakes to Avoid

1.Excavating below founding level and backfilling with loose soil instead of approved compacted material or engineered rectification.

2.Allowing reinforcement to sit on the trench floor, resulting in inadequate concrete cover and reduced durability.

3.Pouring without checking line, level, width, starter bar position, and form bracing, leading to misaligned walls and expensive rework.

4.Adding excess water to the concrete on site to improve workability, which weakens strength and increases shrinkage cracking.

5.Ignoring drainage and surcharge conditions, causing the footing and wall system to be underdesigned for actual site loads.

Pro Tips

💡 On long retaining runs, set offset profiles well clear of excavation so string lines can stay in place from excavation through to final wall set-out.

💡 For stepped footings, mark each step top and bottom level on a story rod. It speeds up checks and reduces laser errors during busy pours.

💡 Order premixed concrete for engineered footings rather than site-mixing. It is usually more economical, more compliant, and far more consistent once volumes exceed small patch quantities.

💡 Use bar chairs and side spacers generously in narrow trenches. Steel movement during a pump pour is one of the most common hidden defects.

💡 If hiring a mini-excavator, plate compactor, or concrete vibrator for a single footing job, hire is usually more economical than purchase. Purchase only makes sense if these items are used regularly across multiple projects.

Recommended Tools

Rotary laser level kit — essential for accurate footing depth, top of concrete level, and stepped footing control

Petrol plate compactor — ideal for base preparation and adjacent backfill zones

Concrete pencil vibrator — improves consolidation around steel and in narrow footing trenches

Rebar tier / tie wire nips — faster and cleaner reinforcement fixing

Mini-excavator 1.7 t–2.5 t hire — cost-effective for residential trench excavation and spoil handling

Frequently asked questions

What is involved in form up and pour concrete footings for a retaining wall?: Forming up and pouring concrete footings for a retaining wall is a routine but critical structural task that directly affects wall alignment, load capacity, drainage performance, and long-term durability. On Australian residential sites, footing design must match soil conditions, wall height, surcha
What skill level do I need for form up and pour concrete footings for a retaining wall?: Advanced — Estimated time: 1–3 days depending on wall length, excavation access, reinforcement complexity, inspection requirements, and concrete volume
What are common mistakes when form up and pour concrete footings for a retaining wall?: 1. Excavating below founding level and backfilling with loose soil instead of approved compacted material or engineered rectification. 2. Allowing reinforcement to sit on the trench floor, resulting in inadequate concrete cover and reduced durability. 3. Pouring without checking line, level, width, starter bar position, and form bracing, leading to misaligned walls and expensive rework. 4. Addi
What tools do I need for form up and pour concrete footings for a retaining wall?: This guide includes a comprehensive tools list. Key building & construction tools are detailed in the Tools Required section.
What is the Australian standard for retaining wall footing design?: The Australian standard for concrete retaining wall footing design is primarily AS 3600:2018 Concrete Structures and AS 3700:2018 Masonry Structures. These standards dictate minimum concrete strength, reinforcement detailing, and cover requirements. For residential applications, AS 2870:2011 Residential Slabs and Footings may also be relevant, especially concerning soil classifications and reactive soils.
How deep should a retaining wall footing be in Australia?: The depth of a retaining wall footing in Australia is determined by an engineer based on soil conditions, wall height, and surcharge loads. According to AS 2870:2011, footings must extend into stable bearing material, typically below the zone of seasonal moisture change. Local council regulations in states like Queensland often specify minimum depths, such as 450mm below natural ground level, but engineer's designs always take precedence.
What concrete strength is typically used for retaining wall footings?: For retaining wall footings in Australia, a minimum concrete strength of 25 MPa (N25) is commonly specified by engineers, though 32 MPa (N32) is often used for increased durability and load capacity. This is in accordance with AS 3600:2018. The specific strength and slump (e.g., 100mm ± 20mm) will be detailed in the engineer's design documentation.

Written by Bricko, the Building & Construction specialist at Aus.Tools.