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Void Filling Solutions

To fix a settling slab, the voids under the slab must be filled. The best solution is to use polyurethane foam or poly jacking. This process involves the injection of a dual liquid material underneath the slab through penny-sized holes drilled in the concrete. Once injected beneath the concrete, the polyurethane expands to fill the voids and compact the soil around the voids. This helps to create a more stable base for the entire foundation.

Some of the most common issues that result in void formation are:

  • Soil Shrinkage: When the weather is extremely hot and dry, the soil under the slab will shrink, forming voids and gaps underneath the foundation.
  • Erosion: These voids form due to erosion from excessive rainfall, which washes away the soil under and around the concrete slab.
  • Hydrostatic Pressure: Heavy precipitation can lead to an increase in hydrostatic pressure in the soil. This pressure pushes on the concrete, causing it to shift, settle, and even develop slab cracks. Animals: In Florida, we have quite a few reptiles and other animals that can burrow a hole underneath your existing foundation.
  • Shifting Soil: Erosion, shrinkage, and poor compaction may cause the soil under your slab to shift and form voids. Poly Lift USA uses underground cameras to detect sizable voids. It is fast, accurate, and an inexpensive method for void detection. The cameras help to accurately locate voids, underground structures, embedded utilities, and other objects.

How It Works

Small 5/8 inch holes are drilled through the sunken slab.
An injector port is carefully installed in each of the holes.
Poly foam is injected into the port, it expands & lifts the slab.
With the port removed, the holes are patched with cement

Before & Afters


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