Our Waterproofing Services
Practical, lasting waterproofing for New York basements, foundations, and walls — for homes and commercial buildings in Harlem, Upper Manhattan, and across NYC.
Waterproofing Services
Kay Waterproofing handles the full range of waterproofing work New York buildings actually need — from quick fixes for minor seepage to full exterior systems on older brownstones. Every project starts with an honest look at the building, the source of the water, and what will hold up long-term.
We don’t push one-size-fits-all packages. We recommend the smallest amount of work that will solve the problem properly.
Basement Waterproofing
Wet basements are one of the most common issues we see in New York buildings. We tackle them with interior drainage, exterior membranes, sump systems, and crack injection — choosing the right approach based on how water is getting in.
Whether it’s a finished basement you’re trying to protect or an unfinished cellar that floods every storm, we can help.
Moisture Control
Moisture isn’t always a flood. Sometimes it’s a damp smell, peeling paint, white efflorescence on walls, or mold near the baseboards. Left alone, it damages finishes and air quality.
We assess humidity sources, ventilation, and wall assemblies, then recommend a targeted plan — vapor barriers, drainage, dehumidification, or sealing — so the space stays dry and healthy.
Leak Prevention
Many leaks start small. A hairline crack, a failed joint, a clogged drain — and a year later there’s real damage. We focus on catching and fixing those weak points before they turn into emergencies.
Common leak prevention work includes crack sealing, drain tile repair, exterior grading advice, and waterproof coatings on at-risk areas.
Wall Waterproofing
For below-grade walls, retaining walls, and brick or masonry exterior walls, we apply waterproof membranes and coatings designed for New York’s freeze–thaw cycles. The goal is simple: keep water out of the wall, and out of your interior finishes.
We work on poured concrete, CMU block, brick, and stone — and we’re used to the older walls common in Harlem and Manhattan.
Residential & Commercial Work
We work for homeowners, landlords, and property managers. That includes single-family homes, brownstones, multi-unit buildings, small commercial spaces, and ground-floor retail with basement storage.
Scheduling is straightforward, the scope is clear, and the price is what we quoted. If something changes mid-project, we tell you before we do anything extra.
Not sure what you need?
Tell us what you’re seeing — water stains, dampness, smells, cracks — and we’ll suggest a sensible next step.
Request a Free Estimate