How We Stopped Water Intrusion Between Two Buildings in Brooklyn
The Problem
A property owner in Brooklyn noticed water entering the building through the joint located between their structure and the neighboring building.
Over time, the joint had deteriorated due to constant exposure to rain, temperature changes, and normal building movement. The sealant had failed in several areas, leaving visible gaps that allowed water to penetrate the wall assembly.
The damaged joint extended from ground level to the roofline, covering approximately 20 linear feet. If left untreated, continued water intrusion could lead to interior moisture problems, masonry damage, mold growth, and structural deterioration.
Issues We Found
- Damaged and deteriorated joint material
- Visible gaps and openings between the buildings
- Signs of water infiltration
- Failed waterproofing protection
- Joint exposed to weather along the entire building height
Our Solution
After inspecting the joint, our team developed a waterproofing plan designed to restore the joint’s flexibility while creating a long-lasting barrier against water intrusion.
To access the work area safely, we temporarily disconnected the nearby downspout. This allowed our crew to work along the entire height of the joint without obstruction.
The first step was removing all damaged and loose materials from the existing joint. Using professional power tools, we carefully cut and prepared the joint to create clean, straight, and even surfaces. Proper preparation is one of the most important steps in any waterproofing project because new materials will only perform as well as the surface they are bonded to.
Once the joint was properly prepared, we sealed all visible gaps, cracks, and openings. This helped prevent water from entering behind the waterproofing system and created a solid base for the final protective coating.
After completing the repairs, our crew applied two coats of an elastic liquid waterproofing membrane over the entire joint area. This flexible membrane is designed to move with normal building expansion and contraction while maintaining a watertight seal.
Once the waterproofing work was completed and inspected, the downspout was reinstalled and the work area was cleaned.
Why Expansion Joint Waterproofing Matters?
Buildings naturally expand and contract due to temperature changes and seasonal movement. Expansion joints are designed to absorb this movement, but when the waterproofing system fails, water can quickly find its way inside.
According to the National Institute of Building Sciences, maintaining exterior building joints is critical for preventing water intrusion and preserving the building envelope.
Need Expansion Joint Waterproofing in Brooklyn, NY?
Zavza Seal specializes in expansion joint repair, exterior waterproofing, foundation waterproofing, masonry restoration, and leak prevention throughout Brooklyn, Queens, Long Island, and the Bronx.
If you have water entering through a building joint, wall crack, or exterior masonry surface, our team can help identify the source and provide a long-lasting waterproofing solution.