Concrete built for salt, sand and wind on the Bass Coast

Why coastal concrete needs extra care

Concrete within reach of Bass Strait spray faces challenges that inland concrete does not. Salt carried on the wind settles on surfaces and can work into porous concrete. Over years, chlorides that reach reinforcement can cause rust, swelling and spalling. Dune sand moves and scours. Sea mist keeps surfaces damp. Strong winds dry fresh concrete too fast. Each of these can shorten the life of a slab if they are ignored.

Mix and cover

Near the coast we use mixes suited to the exposure and make sure reinforcement has enough concrete cover above and around it. A dense, well-compacted and well-cured slab resists salt far better than a weak, porous one.

Building on dune sand

Loose sand is removed or compacted, a crushed rock base is laid, and edges are protected or thickened so they do not wash out. Geofabric may separate rock from sand.

Curing in the wind

We use evaporation retarders, wind breaks and wet curing so the surface does not dry and crack before it gains strength.

Sealing and maintenance

Sealers help keep salt and moisture out. Hosing salt and sand off occasionally and resealing every few years extends life.

How salt attacks concrete

Concrete is alkaline, which normally protects the steel inside from rust. Chlorides from sea salt can slowly penetrate concrete and break down that protection when they reach the steel. Once steel starts to rust it expands, cracking and spalling the concrete above it. The process is slow, but on poorly made or thin concrete close to the sea it can show within years rather than decades.

Distance from the sea matters

Homes right on the foreshore at Cape Paterson, Kilcunda or Inverloch's surf beach get the heaviest salt exposure. A few streets back, exposure is lower but still present, especially on windy days. Engineers use exposure classifications to set concrete strength and cover; for residential driveways and patios, we apply the same principles sensibly.

Sand and scour

Wind-blown sand abrades surfaces and builds up against edges. Heavy rain on sandy blocks can scour beneath slab edges. Connected downpipes, edge protection and good falls all help.

Concrete around beach showers and outdoor taps

Outdoor showers and taps are common at beach houses and keep concrete wet and salty. Good falls, a drain and a sealed surface stop water pooling and staining.

Steel fixings and coastal concrete

Bolts, post brackets and fixings set into coastal concrete should be galvanised or stainless steel. Mild steel fixings rust and stain the surface.

Maintenance routine for coastal concrete

Rinse salt and sand off every few weeks, especially after storms. Check sealers each year and reseal when water stops beading. Address cracks early so water and salt do not get in.

Choosing finishes on the coast

Textured finishes such as exposed aggregate and broom give the best grip in mist and rain, and lighter colours stay cooler and show salt less.

Bass Coast ground, weather and council rules

Wonthaggi sits where the coastal dunes of the Bunurong coast meet the clay country rising toward the Strzelecki foothills. Near the beaches at Cape Paterson, Inverloch and Kilcunda the ground is often pale sand that drains fast but moves if it is not confined and compacted. Inland, around North Wonthaggi, Dalyston and the farms, heavy clay swells in a wet winter and cracks open in a dry February. Parts of the old coal-mining town also carry fill, ash and brick rubble from a century of building. Add salt spray, sea mist and strong south-westerly winds, and concrete here needs a properly designed base, the right mix and careful curing. Each job gets a test hole, and the base is designed around the layers it shows.

Driveways, paths and patios within your own boundary usually need no permit. Any new or altered crossover across the nature strip, footpath or kerb needs a vehicle-crossing permit from Bass Coast Shire Council, which covers Wonthaggi, Inverloch, Phillip Island, San Remo and every town we work in. Accesses onto the Bass Highway or other main roads also involve the state road authority. House slabs, larger sheds and some coastal works need a building surveyor and engineering. We spell out whatever applies in your quote.

What a Wonthaggi Concreting quote shows

Our quotes are broken into the parts of the job rather than a single total. You will see the measured area, demolition and tip fees for any old concrete, pavers or gravel, how deep we excavate, the rock base specification and compaction method, slab thickness and reinforcement, the surface finish or pebble blend, the joint plan, drains and stormwater connections, edges and steps, sealing, and the council vehicle-crossing permit where one is needed. If a concrete pump, a long wheelbarrow run, traffic control on the Bass Highway or protection for a neighbour's driveway is required, it is listed on its own line.

This site deliberately carries no square-metre pricing. On the Bass Coast the same size driveway can sit on clean dune sand in Cape Paterson, wet grey clay in North Wonthaggi or old mine fill in South Dudley, and each needs different groundwork. A price published online would be wrong for most readers, so we prefer to look at your block and quote what it actually needs.