Building Strong Foundations Across New York City
Helping property owners with their projects, solving issues efficiently, and delivering dependable, high-quality construction service.
Negative-side coatings, crystalline systems, interior perimeter drainage, and sumps for cellars where the exterior face of the wall is permanently unreachable.
Treatment of rubble stone, brick, and poured foundation walls in pre-war townhouses and walk-ups, including party wall conditions.
Sidewalk vaults leak at the roof slab and at the joint with the building. We waterproof and repair both, coordinating with DOT requirements for work under the public way.
Membrane replacement, drainage, and overburden reinstatement on plaza decks and terraces above occupied space.
Parking structures, mechanical rooms, and back-of-house space where a leak means downtime, not just dampness.
Where a rear yard, areaway, or open lot line makes excavation possible, we install full below-grade membrane systems.
Work Experience
Waterproofing in Manhattan is a logistics and compliance job as much as a technical one. A townhouse cellar on the Upper West Side may extend into a vault sitting over Con Edison infrastructure. A plaza deck above occupied retail can only be opened in phases, with temporary protection at every stage. A co-op in a designated historic district needs approvals before any exterior work touches the facade.
Sky Grid Group NY plans the access, the permits, and the phasing before we price the work, and everything is executed by our own crews. That focus is why Manhattan townhouse owners, co-op boards, and commercial landlords bring us in on their most constrained sites.
Negative-side waterproofing is specified for long-term hydrostatic pressure, not as a temporary fix.
Phased scheduling, temporary protection, and off-hours work help keep tenants and retail operating.
We address vaults, decks, facades, and cellar walls, with a free inspection and written scope upfront.
Our experts lead every project with clarity, responsibility, and a deep understanding of complex site requirements.
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Project Coordinator
Concrete & Masonry Specialist
Site Operations Manager