To level an uneven concrete slab outside, a common method involves using expanding polyurethane foam.
Leveling Concrete with Expanding Foam:
Here's a breakdown of the process, drawing from the provided reference:
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Drilling Access Holes:
- Small, dime-sized holes are drilled into the sunken or low-lying sections of the concrete slab.
- These holes provide access points for the expanding foam.
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Injecting Polyurethane Foam:
- Expanding polyurethane foam is then injected into these holes.
- The foam is specially formulated to expand and fill the void underneath the slab.
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Lifting and Leveling:
- As the foam expands, it lifts the sunken section of the concrete slab.
- This process continues until the uneven portion is leveled with the surrounding concrete.
- The goal is to achieve a smooth, even surface.
Benefits of Using Expanding Foam
- Non-invasive: Unlike traditional methods, this approach minimizes disruption to the surrounding area.
- Effective: Polyurethane foam provides a strong and stable foundation.
- Long-lasting: Once cured, the foam is durable and helps prevent future settling.
- Cost-effective: It can be a more affordable alternative to replacing the entire slab.
Summary
| Step | Description |
|---|---|
| 1. Drill Access Holes | Small, dime-sized holes are drilled into the sunken areas. |
| 2. Inject Foam | Expanding polyurethane foam is injected into the holes. |
| 3. Lift and Level | The expanding foam raises the slab until it's level with the surrounding area. |
This method is a common and effective way to address uneven concrete slabs outdoors, offering a less disruptive alternative to more invasive solutions.
