Problem:

A residential building in Brooklyn NY was experiencing multiple basement water intrusions that threatened the structural integrity of the foundation wall. During a full inspection, Zavza Seal identified seven damaged points along the wall, each presenting a risk for present or future leaks. These areas included cracks, deteriorated cement, and weak points where water could enter during heavy rainfall or rising groundwater.

The board members grew increasingly concerned because the basement was showing signs of moisture, staining, and efflorescence. One specific trouble area was the gap between a steel support beam and the foundation wall, which was large enough to allow water seepage.

Since the basement serves as a key utility area for the building, the property owners needed a long-lasting structural and waterproofing solution. They also wanted warranty-backed work that would protect the entire foundation wall.

Solution:

Zavza Seal created a full repair and waterproofing plan designed to secure all seven problem areas, strengthen the structure, and create a watertight barrier across the entire 27 linear feet of wall.

1. Repairing Areas 1 and 4

• Our team wire brushed each surface to remove loose material.
  • We installed 4.5 oz reinforced fiber mesh.
  • This was sandwiched between two layers of 6,000 PSI waterproofing cement, creating a durable and fully sealed repair.

2. Repairing Area 5

• We wire brushed the surface to prepare it for bonding.
  • A heavy layer of 6,500 PSI repair mortar was applied and allowed to cure.
  • We installed reinforced fiber mesh between two coats of 6,000 PSI waterproofing cement to complete the repair.

3. Repairing Areas 2, 3, 6, and 7

These locations had deeper and wider cracks that required additional reinforcement.

• We wire brushed the areas thoroughly.
  • Using diamond bits, our team drilled multiple injection ports.
  • We injected formulations of epoxy and urethane, which filled the cracks, restored structural strength, and waterproofed the voids.
  • We finished by installing 4.5 oz fiberglass mesh sandwiched between two layers of waterproofing cement.

4. Point of Intrusion: Space Between Steel Beam and Foundation Wall

This area required a careful and technical approach.

• We steel brushed the damaged space to remove loose concrete.
  • Diamond drilling allowed us to create access ports for deep injection.
  • We injected epoxy and urethane to fill and stabilize the void.
  • Reinforced fiberglass mesh and waterproofing cement were applied, along with adhesives and sealants as needed.
  • Final sealants ensured a continuous watertight bond.

5. Warranty Extension

Although the repairs were focused on the seven intrusion points, our inspection showed that the entire wall was in good condition post-repair. After speaking with a board member, we made the decision to extend our 40-year warranty to the entire 27 linear feet of foundation wall, at no additional cost.

This gives the homeowners complete peace of mind for decades.

Results:

The basement foundation is now fully reinforced and waterproofed across all seven critical areas. The previously vulnerable beam connection point is sealed and structurally sound. Moisture intrusion has been stopped, and the building now benefits from long-term protection backed by Zavza Seal’s industry-leading 40-year warranty.