Building Strong Foundations Across New York City
Helping property owners with their projects, solving issues efficiently, and delivering dependable, high-quality construction service.
Interior perimeter drainage, sump systems, vapor control, and slab sealing for cellars taking on water through the floor or the wall-floor joint.
Full treatment of foundation walls with crystalline and cementitious systems built for the pre-war masonry that most of Brooklyn's housing stock is built on.
Where there's rear or side access, we excavate to the footing, clean and prepare the wall, and install a below-grade membrane with drainage board and a proper footing drain, the permanent fix rather than a managed leak.
On attached rowhouses with no exterior access, we work from the inside: negative-side coatings, channel drains, and sump discharge routed correctly.
Repointing, parging, and breathable water-repellent treatment for brownstone and brick so water stops entering above grade and running down inside the wall cavity.
Polyurethane injection for active leaks and epoxy for structural cracks, sealed full-depth through the wall.
Work Experience
Waterproofing in Brooklyn is rarely a single-surface problem. A Park Slope brownstone can be leaking at the cellar wall because water is entering through failed pointing three stories up. A Gowanus basement may be dry all summer and flood every spring because the water table rises, not because the wall failed. Treating the visible wet spot without tracing the path is how owners end up paying twice.
Sky Grid Group NY inspects the whole water path before we quote, and we handle any required permits and sign-offs ourselves. We are waterproofing and masonry specialists, and that focus is why Brooklyn homeowners, co-op boards, and managing agents keep bringing us back.
We identify the actual entry path and recommend the right waterproofing approach for the property.
Breathable systems help older walls dry properly without trapping moisture inside.
We work with attached rowhouses and detached properties, providing a free inspection and written, itemized estimate.
Our experts lead every project with clarity, responsibility, and a deep understanding of complex site requirements.
All Member All Member
Project Coordinator
Concrete & Masonry Specialist
Site Operations Manager