Interior Basement Leak Repair by Zavza Seal

Project Overview:

Our team at Zavza Seal was contacted by a homeowner in Garden City, NY about water showing up in the north west corner of their basement. The affected area extended about 7 linear feet to the east and 7 linear feet to the south.

The owner noticed water near the north side of the basement wall. During our inspection, our estimator also saw clear signs of water damage on the west side of the same corner. At that point, it was not clear exactly where the water was entering.

This required a careful two phase approach.

The Problem:

The homeowner was dealing with:

• Visible water near the north wall
• Water staining and damage on the west wall
• Damp basement air
• Concern about hidden mold and structural damage

The exact entry point of the water was unknown. In many Long Island homes, water can travel behind foundation walls and show up in a completely different location than where it entered.

According to the Environmental Protection Agency, moisture problems in basements can quickly lead to mold growth if not properly addressed. The homeowner wanted a permanent solution, not a temporary patch.

Our Solution:

We handled this project in two clear phases to make sure the issue was properly diagnosed and fixed.

Phase I: Exploratory Work

Because the water entry point was not clearly visible, we began with detailed interior exploratory work.

Our Investigation Included:

• Inspection and probing of the affected walls
• Close inspection using high wattage lighting
• Controlled water testing
• Infrared and moisture analysis

This process allowed us to trace the path of water behind the wall surface and identify weak points in the foundation area.

Exploratory work is critical in basement waterproofing. Sealing the wrong spot can waste time and money. Our approach ensures we treat the root cause.

Phase II: Interior Waterproofing

After identifying the vulnerable areas, we moved forward with interior waterproofing.

To properly access the foundation wall, we removed sections of drywall and framing as needed. In some areas, we also removed the lower portion of the staircase to gain full access. Staircase reinstallation was included in our scope.

Waterproofing Steps We Completed:

• Installed 4.5 oz reinforced fibermesh along all joints
• Applied two coats of 6,000 PSI waterproofing cement
• Applied professional grade sealants to seal all penetration points

The use of high strength waterproofing cement creates a dense barrier against hydrostatic pressure. The Federal Emergency Management Agency explains that proper sealing and reinforcement are essential in preventing repeated basement water intrusion.

The Result:

After completing the waterproofing system:

• The north west corner was fully sealed
• Moisture readings returned to normal levels
• The homeowner reported a dry basement after subsequent rainfall
• The space was protected against future water penetration

The homeowner now has peace of mind knowing the issue was fixed at its source.

Why This Matters for Garden City Homeowners?

Homes in Garden City and across Nassau County often have aging foundations that can develop cracks or weak joints over time. Interior basement waterproofing is often the most efficient way to stop leaks without major exterior excavation.

If you see:

• Water stains on basement walls
• Musty smells
• Damp drywall
• Efflorescence or white powder on concrete

It is important to act quickly before structural damage or mold develops.

Need Basement Waterproofing in Garden City, NY?

At Zavza Seal, we focus on finding the true source of water intrusion before we seal anything. Our problem solution approach ensures long term protection, not temporary fixes.

If your basement is showing signs of water damage in Garden City, NY, contact Zavza Seal today for a professional inspection and permanent waterproofing solution.