Concrete slabs can sink or settle over time due to various reasons, such as soil erosion, poor compaction, or the breakdown of organic materials underneath the slab. This can lead to uneven surfaces, creating tripping hazards and reducing the aesthetic appeal of your property. An effective and modern solution to this problem is using polyurethane foam, a method known for its efficiency and durability. Here’s a step-by-step guide on how to fix a sinking concrete slab with polyurethane foam, ensuring a stable and level surface.
Understanding Polyurethane Foam Lifting
Polyurethane foam lifting, also known as Boost Concrete Lifting, is a technique where a two-part polyurethane foam is injected under the concrete slab. The foam expands, filling voids and lifting the slab back to its original level. This method is highly effective for residential, commercial, and industrial applications.
Benefits of Using Polyurethane Foam
- Quick and Non-Invasive: The process is fast, often completed within a few hours, and does not require extensive excavation or disruption.
- Durability: Polyurethane foam is long-lasting and can withstand heavy loads and harsh environmental conditions.
- Cost-Effective: Compared to traditional methods like slab replacement, foam lifting is more affordable.
- Minimal Downtime: Areas treated with polyurethane foam can often be used immediately after the procedure is completed.
Step-by-Step Guide to Fixing a Sinking Concrete Slab
1. Assessment and Preparation
Before starting the repair, assess the area to determine the extent of the sinking and the cause. Look for cracks, gaps, and other signs of settlement. Clear the area of any debris, dirt, or obstacles that might hinder the process.
2. Drill Injection Holes
Drill small holes, typically around 5/8 inch in diameter, into the concrete slab at strategic locations. These holes will serve as entry points for the polyurethane foam. The number and placement of the holes depend on the size and shape of the slab.
3. Inject Polyurethane Foam
Using specialized equipment, inject the Best Polyurethane Foam Concrete Lifting through the drilled holes. The foam will begin to expand immediately, filling the voids beneath the slab and lifting it. The expansion process is controlled and monitored to ensure even lifting and to prevent over-raising the slab.
4. Monitor the Lifting Process
Carefully monitor the slab as it rises. This can be done using a level or laser leveling equipment to ensure that the slab is lifted evenly and reaches the desired height. Adjustments can be made during the injection process to achieve optimal results.