House and Extension Slabs in Hervey Bay

A house slab is engineered, not estimated

A slab that carries a home, an extension or a granny flat is designed before it is poured. In Australia, residential slabs and footings follow AS 2870, and the design starts with a site classification: a soil assessment that rates how much the ground moves as it wets and dries. The engineer then specifies the slab thickness, the beams, the steel and the concrete strength for that site.

The concreter builds what is on the drawings. If anyone offers to pour a house slab without an engineer’s design, that is the answer to whether to use them.

What happens before the pour

Building work like this needs approval, and the building certifier inspects the slab before concrete is placed. That inspection checks the steel, the beam depths, the bar chairs holding the steel at the right height, and the moisture barrier under the slab. Termite management and plumbing under the slab also need to be in place and correct before the pour, because none of it can be fixed afterwards.

A good slab job is mostly preparation. The pour itself is a few hours; the setting out, excavation, boxing, steel and plumbing coordination take days.

Extensions and granny flats

An extension slab has to meet the existing house at the right height, and it needs a proper joint where new concrete meets old. Granny flats are often on the back of the block, so access matters: how the concrete truck or pump reaches the slab is part of the quote and part of the price.

Hot days and curing

Hervey Bay summers are hot, and fresh concrete loses water quickly in heat and wind. Pours are often booked early in the morning, and the slab is kept moist or covered while it cures. A concreter who talks about curing without being asked is a good sign. More on that in when you can drive on new concrete.

Getting it quoted

Have your engineering drawings ready if you have them. Call 0489 955 511 with the slab size, the suburb and whether there is access for a truck or a pump, and a licensed local concreter will come back to you. For simpler work, see shed slabs.