HOW DO WE RAISE SUNKEN CONCRETE WITH FOAM?
Raising concrete with foam, also known as polyurethane foam injection or foam jacking, involves several steps. Here's a general outline of the process:
1. Assessment: Begin by assessing the sunken or settled concrete slab. Determine the extent of the sinking and identify any underlying issues, such as soil problems or water-related factors, that may have caused the settlement.
2. Drilling Holes: Drill small holes into the concrete slab at strategic locations. These holes serve as access points for injecting the polyurethane foam.
3. Injection: Insert injection equipment into the drilled holes. Polyurethane foam, typically consisting of two components that mix during injection, is then pumped into the void beneath the concrete slab. The foam expands to fill the void and raise the slab.
4. Lifting and Leveling: As the foam expands, it lifts and levels the concrete slab to the desired height. The injection process allows for precise control over the lifting. 5. Monitoring: The process is often monitored using laser levels or other tools to ensure that the slab is lifted evenly and accurately.
6. Curing: Polyurethane foam cures and hardens relatively quickly, often within minutes. This rapid curing allows for a fast repair process.
7. Cleanup: After the foam has cured, excess foam that may have expanded through the drilled holes is trimmed away, leaving a clean surface.
8. Re-Sealing Holes: The holes drilled for injection are typically sealed with cement or a similar material to restore the appearance of the slab.
It's important to note that raising concrete with foam is a specialized process that should be performed by trained professionals with the appropriate equipment and materials. Attempting this as a DIY project can result in uneven lifting, inadequate repair, or other complications. Hiring a concrete contractor experienced in foam jacking is advisable for safe and effective concrete leveling.