Structural Crack Injection and Concrete Slab Lifting in Addisleigh Park, NY

At Zavza Seal, our team recently completed a waterproofing and structural stabilization project for a homeowner in Addisleigh Park. The property was experiencing water penetration through foundation cracks along with sinking concrete near the driveway area caused by soil voids underneath the slab.

Our team created a repair plan to stop water intrusion, stabilize the concrete slab, and improve drainage protection around the foundation.

The Problem

The homeowner noticed signs of water entering through cracks in the interior foundation wall. Over time, moisture had started affecting several penetration points along the wall surface.

Outside the home, the concrete driveway slab had also begun sinking due to years of water exposure underneath the concrete. The soil below the slab had developed empty spaces and weak areas, causing the slab to settle unevenly.

The property owner wanted a long-term solution that addressed both the structural issues and the ongoing moisture problems.

Interior Foundation Crack Waterproofing

Our team first focused on the interior structural crack repair.

To stop water from penetrating through the crack, we:

• Injected epoxy and urethane formulations into the structural crack
• Reinforced the repaired area with 4.5 oz fiber mesh
• Applied waterproofing cement over the repair area

We also repaired additional wall penetration points by:

• Grinding damaged sections with diamond blades
• Applying reinforced waterproofing cement
• Installing fiber mesh where needed for extra strength

These repairs helped seal vulnerable areas and improve the wall’s resistance to moisture intrusion.

Exterior Concrete Slab Stabilization

During our inspection outside the property, we found that years of water exposure had created large voids underneath the concrete driveway slab.

These hidden gaps were causing the slab to sink and shift.

Our Slab Lifting Process

To stabilize the driveway, our crew:

• Drilled access holes through the concrete slab
• Pumped stone slurry grout beneath the slab
• Filled the empty voids under the concrete
• Gradually lifted the slab closer to its original position

This process helped restore support underneath the driveway while reducing future movement.

Joint Waterproofing and Sealing

To help prevent future water intrusion, we also waterproofed and sealed the joints around the slab and foundation wall.

Our team:

• Applied sealants to slab joints
• Sealed expansion joints near the foundation wall
• Improved moisture protection around the exterior concrete surfaces

These steps help reduce the amount of water that can travel into vulnerable foundation areas.

Dryer Exhaust Installation

As part of the project, our team also installed a new through-wall dryer exhaust system in the basement laundry room.

This included:

• Core drilling through the concrete foundation wall
• Installing a new dryer exhaust hose
• Adding an exterior rain hood for weather protection

All work was completed according to NYC Fire Code requirements.

The Result

After the project was completed, the homeowner had:

• Waterproofed structural foundation cracks
• Reduced water penetration inside the basement
• Stabilized and lifted driveway concrete
• Sealed slab and foundation joints
• Improved exterior moisture protection
• A properly installed dryer exhaust system

The property now has stronger structural support and better protection against future water-related damage.

Why Crack Injection and Slab Stabilization Matter

Foundation cracks and sinking concrete slabs can become worse when water continues entering the structure or washing away supporting soil underneath.

The International Concrete Repair Institute explains that early crack repair and structural stabilization help extend the life of concrete structures and reduce future deterioration.

The Federal Emergency Management Agency also highlights the importance of proper drainage and foundation moisture control to help reduce structural damage risks.

If you are dealing with foundation cracks, basement leaks, sinking concrete slabs, or drainage problems in Addisleigh Park, the team at Zavza Seal can help with professional waterproofing, crack injection, and structural repair services.