Town/Neighborhood: Midwood
Borough/County: Brooklyn
Construction Type: Residential
Category: Foundation Repair, Basement Waterproofing, French Drain Installation

Problem:

The basement foundation walls were showing signs of moisture intrusion and deterioration. The existing French drain system had failed, allowing water to seep into the basement and weaken the original rubble foundation walls. The vapor barrier was ineffective, and the sump pump discharge line was improperly located beneath the deck, causing drainage inefficiencies. The homeowner needed a comprehensive basement foundation repair and waterproofing system to protect the structural integrity of the home.

Solution:

Our team at Zavza Seal carried out a thorough remediation and restoration of the basement foundation using the following phased approach:

• We demolished all exterior basement walls and removed framing plates and studs as needed.
• The lower two feet of drywall along the interior walls were removed and disposed of to fully expose the affected areas.
• We removed the existing vapor barrier to gain direct access to the original rubble foundation.
• We repaired all compromised rubble foundation walls using high-strength grout, ensuring a stable and durable surface.
• The existing, failed French drain system was cut out of the concrete slab and disposed of.
• We excavated down to the bottom of the foundation footing to allow proper installation of a new drainage system.
• A new gravel bed was laid and covered with a soil separator to maintain drainage integrity.
• We installed a new 4-inch perforated drainage pipe wrapped in soil separator fabric and pitched it properly toward the existing sump basin.
• The existing sump pumps were tested and found to be fully functional, so they were retained.
• We rerouted the sump pump discharge line, extending it 10 feet away from the foundation wall to reduce water reentry.
• We installed a Delta-brand high-performance waterproofing membrane featuring a recycled HDPE inner layer and a virgin high-density polyethylene outer layer. Its vacuum-formed dimpled pattern facilitates water flow down to the footing drain.
• The new French drain system was then encased with 4,000 PSI high-strength concrete to complete the waterproofing process.

Note: The homeowner was advised to rent a storage pod to clear the basement before the start of the project.

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