How To Fill A Void Under Concrete And Why It’s Essential?

Aron Warren - January 11, 2022 - 0 comments

Residential and commercial property owners often need to spend a hefty amount on maintenance. If your property is relatively old, you might need to invest a higher amount to mitigate the voids under the structure of buildings. Such voids can weaken the overall integrity of foundation slabs. Also, they can result in dangerous and ugly cracks on the walls, as well as on the floors of the property.

On filling up the voids

Several premier concrete levelling companies in Australia recommend different ways to regain the structural integrity of your building. Depending on the unique needs of your property, they can recommend a conventional or a modern remedial approach. Specialists can raise or relevel the slabs using advanced, non-invasive remedial technologies.

Selecting Slab Jacking

The procedure of slab jacking is not new in Australian households. It refers to the filling up of the voids below the ground. It specifically targets the voids beneath concrete slabs. Engineers can do it by injecting or pumping under the slabs with materials that fill the voids and improve the ground in areas that need treatment. If you want to fill in the cracks of concrete by slab jacking, you can choose from different materials. No matter which material you choose, they would deliver similar results. You can choose from materials including:

1. Expanded polymer foam

2. sand-cement grout

On sectional slab repair

If you’re looking for an alternative to jacking, sectional repair of slabs can be an option. Consider repairing only those parts of the slab that have been damaged. Here, the engineers might plan to break the affected area into smaller units, which will help access the void. For levelling the concrete, the area is filled with concrete and slab, which will subsequently seal the cracks. This procedure requires extra care and attention because a poorly filled in void might malfunction anytime.

When do you need a replacement?

There might be extreme cases where the slab is damaged beyond repair, which means that no technique will suffice to keep it in good shape. Under such circumstances, you might need to replace the slab entirely. In such cases, you’ll need to have a thorough assessment carried out by a professional.

Why is it so important?

Taking care of sinking concrete in a timely manner is more important than you might think. Any defect under the concrete slab, no matter how minor, can give rise to several serious issues. Some of them include:

1. Buckling up the walls.

2. Gradually leaning or tilted building walls.

3. Unlevelled floor surfaces, along with dips and bowls.

4. Depression of the foundation of the home altogether.


If you’re a homeowner in Australia, receiving appropriate help and advice is just a phone call away. Whether you’re after an assessment or have some initial queries, a timely call to an experienced company is the first step to take.

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