Excess moisture and groundwater in a crawl space can lead to foundation problems, mold growth, and poor indoor air quality. When water pressure builds around foundation walls, it can eventually find its way into the crawl space and create ongoing issues for homeowners.
Recently, the Zavza Seal team completed a crawl space waterproofing project in Bayport, NY. The homeowner was experiencing concerns related to a rising water table and hydrostatic pressure against the foundation walls. Our goal was to create a reliable drainage system that would protect the crawl space and foundation for years to come.
The Problem
The crawl space foundation walls were built with cinder blocks that had not been properly waterproofed or reinforced against water pressure. Over time, groundwater around the property created hydrostatic pressure against the walls.
As water levels in the soil increased, moisture was able to reach the foundation walls and enter the crawl space area. If left untreated, this type of problem can contribute to damp conditions, mold growth, musty odors, and long-term foundation deterioration.
The homeowner wanted a permanent solution that would collect water before it entered the crawl space and safely move it away from the home.
The Solution
After a detailed inspection, our team designed and installed a complete crawl space drainage and waterproofing system.
We began by excavating a trench along the foundation wall and dirt floor joint around approximately 140 linear feet of crawl space perimeter.
Next, we installed a Delta high-performance dimpled waterproofing membrane along the foundation walls. The membrane extends from the top of the cinder block walls down into the drainage trench. This allows any water reaching the foundation wall to flow directly into the drainage system instead of entering the crawl space.
To collect groundwater, we installed a 4-inch perforated PVC French drain pipe on a deep gravel bed. A soil separator was added to help keep dirt and sediment from entering the system.
We then excavated and installed a new sump pump basin. Inside the basin, we installed a high-efficiency one-third horsepower sump pump along with check valves, plumbing connections, and discharge piping.
To safely remove collected water from the property, we installed a discharge line underground and routed it to a dry well in the yard. Water is released through a pop-up emitter away from the home’s foundation.
After all drainage components were installed, the system was backfilled and completed to provide long-term protection against groundwater intrusion.
The Result
The new waterproofing and drainage system now captures groundwater before it can build up against the crawl space walls.
The French drain continuously collects water along the perimeter, while the sump pump actively removes water from the system and directs it away from the foundation.
The waterproofing membrane provides an additional layer of protection by guiding wall moisture into the drainage system where it can be safely discharged.
As a result, the homeowner now has a drier crawl space, improved foundation protection, and greater confidence during periods of heavy rainfall and seasonal groundwater fluctuations.
Why This Solution Works?
This project addresses both groundwater collection and foundation wall protection.
The waterproofing membrane helps prevent moisture from reaching the crawl space interior. The French drain collects water at the source, and the sump pump removes it before pressure can build around the foundation.
Together, these components create a complete water management system that helps reduce the risk of crawl space flooding, moisture damage, and foundation deterioration.
This Bayport crawl space waterproofing project was completed with Zavza Seal’s industry-leading 40-year warranty, providing long-term protection and peace of mind for the homeowner.