Can You Underpin a House Slab? Yes - And Sometimes You Really Need To.
If you own a home built on a concrete slab, you might think you’ll never need underpinning. After all, slabs are meant to be strong and stable, right?
But here’s the truth: Slab homes can and do move – and when they do, the damage can be serious. Cracks in your walls, doors that won’t close properly, or floors that slope could all be signs that your slab has shifted due to soil movement, poor site preparation, or even changing drainage patterns around your home.
why do slabs move?
Australia’s reactive clay soils are notorious for expanding and contracting with moisture changes. Over time, this constant movement can cause a concrete slab to settle unevenly, leading to subsidence and structural damage.
Older slabs often have minimal footing depth or weren’t designed for today’s conditions. Even newer slabs can be affected if drainage is poor or if nearby trees draw too much moisture from the soil.
So, Can a Slab Be Underpinned?
Yes! And this is where experience really matters. Underpinning a slab is different from underpinning strip footings or stumps – it requires careful assessment by an experienced contractor and as is always the case with structural repairs an engineer-designed solution.
The goal is to extend the foundation down to more stable soil layers, stopping further movement and giving you peace of mind that your home is secure for decades to come.
Don’t Fall for Quick Fixes
There are plenty of quick-fix products out there that promise to “lift” or “inject” your slab back into place. But without proper engineering, building permits, and structural inspections, you’re risking a temporary fix that could fail down the track.
A proper underpinning job should be done to code, with a building permit, so you have the paperwork to prove the work was done right – something that’s especially important if you sell your home in the future.
when should i reach out to arrange an assessment?
If you see cracks in your brickwork, your slab floor is sinking, or doors and windows are sticking, don’t ignore it. The sooner you have it assessed, the better (and often cheaper) the fix.
At Fred R. Heimann Co. Pty. Ltd., we’ve been underpinning all types of foundations in Melbourne and Geelong – including slabs – for decades. We work with licensed engineers and provide permitted, long-term solutions that give you confidence your home is safe and sound.
Need Real Structural Repairs? Let’s Talk
Feel free to reach out by filling our Contact Form and we’ll get back to you with our thoughts – no pressure, no sales pitch. Just straight answers from a company that’s been doing this for generations.