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Sinking Foundation Repair

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Have You Noticed Sunken Foundations?

Sunken concrete slabs can indicate compromised sub-soils. If you notice uneven, cracked, or “pumping” slabs, it’s crucial to address the issue promptly with sinking foundation repair. Let the experts at Underpinning assess the situation, scope the necessary work, and re-level your slabs to prevent future damage to your foundations and property by stabilising the soil beneath.

Welcome to Underpinning, your trusted partner for repairing sinking foundations in Brisbane and the Gold Coast. We specialise in residential and commercial sinking foundation repairs, utilising advanced resin-injection methods and top-tier products to ensure durable and effective solutions. Partnering with Alchatek, we use structural foams that are stronger than crystalline bedrock, including AP Soil 600, AP Fill 700, AP Fill 720, AP Lift 430, and AP Lift 475. These foams are NSF/ANSI/CAN 61 certified, meaning they are safe for contact with drinking water and environmentally friendly.

Benefits of Our Resin Injection Method

  • Cost-Effective: More affordable than traditional underpinning methods.
  • Non-Invasive: No major excavation required.
  • Efficient: Typically completed in less than a day.
  • Environmental Safety: Alchatek foams are safe for contact with drinking water.
  • Comprehensive Repair: Stabilises the ground, seals cracks, levels foundations, and restores structural integrity.
Sinking Foundation Repair SettledSinking Foundation Repair Leveled

What Causes Sunken Concrete?

Several factors can cause subsidence, leading to sunken or cracked concrete:

  • Water Washouts: Excess water can erode the soil beneath your foundations.
  • Reactive Clay Soils: These soils expand when wet and contract when dry, leading to instability.
  • Vegetation: Tree roots and plants can draw moisture from the soil, causing it to shift.
  • Improper Compaction: Insufficiently compacted soil can settle over time, causing subsidence.

Signs of Sunken Concrete

Subsidence is often visible and can manifest in various ways:

  • Sunken Concrete: Uneven or depresses areas.
  • Cracks: Visible splits or fractures in the concrete.
  • Tilted Slabs: Uneven surfaces that slope or slant.
  • Movement: Shifting between slabs and fixed structures.
  • Noise: Clunking sounds when vehicles traverse the slabs.
  • Water Squishing: Water being squeezed out from under the slabs.
  • Trip Hazards: Uneven surfaces posing safety risks.
  • Voids: Visible gaps beneath the slabs.
Team of sinking driveway experts inspecting cracks in a sunken driveway of a home on the Gold Coast
Sinking swimming pool deck on the Gold Coast
Commercial sinking foundation repairs experts fixing the sunken foundations of the floor of a warehouse in Brisbane.

Our Process

Step 1

Prepare

Drilling a series of tiny holes in the affected area.

Step 2

Inject

Introducing our specially formulated polyurethane resin.

Step 3

Expand

The resin fills voids and hardens instantly, compacting the ground. The area is reinforced and re-levelled if required.

Sea Wall & Retaining Wall Repairs

Underpinning has a proactive approach to the long-term problem of failing Sea Walls and Retaining Walls. We have researched, trialed, and invested heavily in providing the latest technologies in revetment wall repairs and believe our construction techniques will lead to a fresh cost-effective solution to this looming problem.

Contact our office for a complete run-down on our Proprietary Scanning, Anchoring, and Resin Systems.