The Problem
A homeowner in Woodbury, NY discovered a large sinkhole developing in the backyard. The sinkhole had reached approximately four feet deep and varied in length and width. As the void expanded, it created an unsafe condition and threatened the stability of the nearby concrete walkway.
The existing concrete surface above the affected area was no longer properly supported. If left untreated, the sinkhole could continue growing, causing additional settlement, cracking, and safety hazards for anyone using the walkway.
The homeowner contacted Zavza Seal for a permanent solution that would restore the area and prevent future settlement.
Our Solution
After a detailed site inspection, our team developed a repair plan to stabilize the affected area and rebuild the damaged concrete surface.
First, we carefully demolished and removed the existing concrete flag located above the sinkhole. Once the concrete was removed, we cleared and prepared the sinkhole area for repair.
To rebuild the ground structure, we brought quality fill materials to the site, including soil and RCA crushed stone. The sinkhole was backfilled in controlled layers, with each layer compacted thoroughly to reduce future settlement risks.
Our repair process included:
- Demolishing and removing the damaged concrete section
- Clearing and preparing the sinkhole area
- Importing and installing engineered fill materials
- Backfilling with soil in compacted layers
- Installing a crushed stone base for additional support
- Compacting the area using commercial-grade equipment
- Installing concrete formwork
- Adding steel wire mesh reinforcement
- Pouring high-strength 4,000 PSI concrete
- Creating and sealing expansion joints
- Applying a professional broom finish
- Removing debris and leaving the site clean
To strengthen the new concrete and improve long-term performance, steel wire mesh reinforcement was installed before the concrete pour. Expansion joints were also waterproofed and sealed to help protect against water intrusion and cracking.
The Result
The backyard sinkhole was successfully stabilized and permanently repaired. The new foundation base beneath the walkway was properly compacted and reinforced, creating a strong and durable surface.
The homeowner now has a safe, level concrete walkway supported by stabilized soil and crushed stone. The completed repair restored both the appearance and structural integrity of the property while helping protect against future settlement issues.
For added peace of mind, the project was completed with a 40-year warranty.
Why Proper Sinkhole Repair Matters?
Simply filling a sinkhole with loose soil is rarely a permanent solution. Proper repairs require controlled backfilling, layer-by-layer compaction, and a stable aggregate base to reduce the risk of future settlement.
According to the Federal Highway Administration, proper soil compaction is one of the most important factors in preventing settlement and maintaining long-term ground stability.
The Portland Cement Association also notes that reinforced concrete and properly designed joints help improve durability and reduce cracking in concrete surfaces.
Zavza Seal stands behind the quality of our workmanship. This sinkhole repair and concrete restoration project in Woodbury, NY was completed with a 40-year warranty, providing long-term protection and confidence for the homeowner.