Concrete Slabs & Foundations Gold Coast
Planning a new machinery shed, house extension, garage floor, or water tank pad? Building on unreinforced or poorly compacted ground risks permanent structural cracking and floor failure. Our QBCC-licensed team pours engineered concrete slabs Gold Coast wide, complying strictly with AS 2870 (Residential Slabs & Footings) & AS 3600.
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6 Engineered Concrete Slab Types We Pour
Every concrete slab must be engineered for its specific weight load, ground sub-base, and moisture environment:
1. Residential Shed & Workshop Slabs
100mm–125mm slab depth, 50mm compacted roadbase foundation, SL82 steel mesh on plastic bar chairs, poured at N32 strength with perimeter edge beams for steel portal frames.
2. Heavy Industrial & Warehouse Slabs
125mm–150mm depth, 150mm compacted roadbase, double SL82/SL92 steel mesh, poured at N40 high-strength concrete with helicopter power-trowel finish for heavy truck traffic.
3. House Extension & Granny Flat Foundations
Engineered Class M or H1/H2 raft slabs with 0.2mm plastic vapor barriers, doweled tie-ins to existing house footings, and structural trench beams complying with AS 2870.
4. Outdoor Patio & Alfresco Entertaining Slabs
100mm N25/N32 concrete slabs with broom or decorative finish, designed with 1:100 fall away from house walls to prevent rainwater pooling.
5. Double Garage & Carport Slab Foundations
125mm reinforced N32 concrete slabs with thickened perimeter footings designed to carry heavy 4WDs, boat trailers, and workshop tool chests without cracking.
6. Water Tank & Heavy Equipment Pads
Heavy-duty 150mm N32 reinforced concrete pads with double SL82 steel mesh engineered to support 22,000L+ rainwater tanks and heavy air conditioning plant equipment.
Soil & Subgrade Ground Analysis Across Gold Coast Suburbs
Pouring a durable concrete slab on the Gold Coast requires adapting to distinct local soil profiles:
Reactive Clay Soils (Pimpama, Coomera & Ormeau)
Clay soils expand dramatically when wet and shrink in dry periods. We prevent slab cracking by laying 0.2mm moisture barriers, compacting 75mm roadbase, and elevating SL82 mesh on bar chairs.
Sloping Acreage & Rock (Kingsholme & Willow Vale)
Acreage blocks off Montego Hills feature steep rock outcrops. We bench cut subgrade, pour deep trench footings into solid rock, and utilize concrete line pumps for steep site access.
Alluvial Industrial Ground (Yatala Enterprise Area)
Subsoil near the Albert River contains fine alluvial clay. Industrial slabs supporting 10-tonne forklift loads require 150mm roadbase sub-base compaction and high-strength N40 concrete mix.
Our Concrete Slab Construction Process
Excavation & Subgrade Compaction
We strip topsoil, excavate to solid subgrade, cut perimeter edge footings, and compact a 50mm–100mm roadbase foundation using mechanical plate compactors.
Vapor Barrier, Formwork & Steel Mesh
We erect square timber formwork, lay 0.2mm high-impact plastic moisture underlay, and elevate SL82 steel reinforcement mesh on 50mm plastic bar chairs per AS 2870.
N32 Concrete Pour & Vibratory Screeding
We pump high-density N32 concrete (or N40 for industrial pads), consolidate with internal concrete vibrators to eliminate air pockets, and laser screed flat.
Power Trowel Finishing & Joint Cutting
We finish the surface using power trowel helicopters for smooth burnished shed floors, then saw-cut stress relief control joints within 24 hours to eliminate random cracking.
Recent Concrete Slab Installations
Shed Slab
12m x 8m Shed Slab Pour
Heavy SL82 steel mesh reinforced N32 concrete slab with power-trowel finish in Yatala.
Extension Foundation
Engineered House Extension Slab
Raft slab with 0.2mm vapor barrier and doweled footing tie-ins built to AS 2870 in Coomera.
On-Site Rig
Mobile Concreting Setup
Fully equipped truck and line pump rig pouring residential and commercial slabs across Gold Coast.
What Property Owners Say
"Poured a 10x7m machinery shed slab on our Yatala property. Laser level finish, SL82 steel mesh on chairs, and smooth power trowel finish. Excellent concreters!"
Trevor M.
Property Owner, Yatala"Poured a foundation raft slab for our house extension in Coomera. Fully compliant with AS 2870 and passed council inspection with flying colors."
Jason P.
Homeowner, CoomeraService Suburbs Across Northern Gold Coast
Frequently Asked Questions — Concrete Slabs
Q: How much does a concrete shed slab cost on the Gold Coast?
A: Concrete slab costs depend on square metres, slab thickness (100mm vs 125mm), excavation depth, steel mesh grade, and site access. Call us on 0411 914 157 or fill out our quick quote form for a free, accurate on-site quote.
Q: What concrete thickness is required for a vehicle shed slab?
A: Standard lawn sheds require 100mm thickness. For vehicle workshops, caravans, or heavy machinery sheds, we recommend 125mm to 150mm thick N32 concrete with SL82 steel mesh reinforcement.
Q: How do you prevent concrete slabs from cracking in reactive Gold Coast soil?
A: We prevent slab cracking by compacting a solid roadbase foundation, laying 0.2mm plastic vapor barriers, elevating steel SL82 mesh on bar chairs, and saw-cutting stress expansion joints every 3 to 4 metres.
Q: How long before I can erect a steel shed on a new concrete slab?
A: You can erect steel shed framing after 3 to 5 days once the concrete reaches initial cure strength. Heavy vehicles or machinery should stay off the slab for 28 days for full structural design strength.
Q: Do concrete house extension slabs require council approval on the Gold Coast?
A: Yes. Residential extension slabs require structural engineering plans complying with AS 2870 and building certification through the City of Gold Coast or a private certifier.
Our Partners
and construction commission