What we do
- Building waterproofing NYC
- Waterproofing contractor & commercial waterproofing
- Building envelope repair & restoration
- Masonry waterproofing
- Roof deck, terrace & balcony waterproofing
- Foundation walls (exterior)
- Window & facade sealant replacement
Recent NYC projects
What NYC building owners say
Systematic waterproofing restoration
Waterproofing repair starts with identifying the failure location and mechanism — not just where water appears, but where it enters. We remove finishes as needed to access and assess the membrane condition, drainage system, and structural substrate.
Repair scope depends on findings. Localized membrane repairs may suffice for isolated failures. Widespread deterioration requires full membrane replacement with proper drainage, protection board, and finish restoration. We specify systems based on the specific application — traffic deck, protected membrane, or fluid-applied.
Suspect a waterproofing failure?
Free assessment. We trace the infiltration to its source and develop a targeted repair plan.
Water finds every weakness in your building envelope
Building waterproofing failures in NYC cause more cumulative damage than almost any other building system failure. Water infiltrates through roof decks, terraces, balconies, plaza areas, masonry walls and foundation walls — often silently, for years, before the damage becomes visible.
By the time you see staining, mold, or structural deterioration, the waterproofing membrane has been compromised for months or years. The repair cost escalates with every season of delayed action — from membrane replacement to structural remediation to interior restoration.
A waterproofing contractor who only works on one surface tends to blame the next one. We treat the building envelope as one system — roof, terraces, masonry walls, windows and foundation walls — and trace the water to where it actually enters.
Where waterproofing fails
Roof Decks & Terraces
Occupied roof spaces with pavers, planters, or finishes over membrane. Failures are hidden under the surface and require removal of finishes for access.
Balconies & Landings
Cantilevered and supported balconies endure direct weather exposure. Failed waterproofing deteriorates the structural concrete beneath.
Plaza & Podium Decks
Large horizontal surfaces over occupied space. Complex drainage, multiple penetrations, and heavy traffic make these among the most challenging waterproofing applications.
Foundation Walls (Exterior)
Foundation walls face hydrostatic pressure, and they are waterproofed from the exterior face, where a membrane keeps water out of the wall rather than managing it inside. Where the wall can be exposed, we install membrane, protection board and drainage. Interior basement systems are not part of our scope.
Masonry Waterproofing & Facade Sealants
Water that enters through open mortar joints, cracked copings and failed window perimeter sealant shows up indoors far from where it got in. Masonry waterproofing starts with the joints and flashings — repointing, coping and through-wall flashing repairs — and sealant replacement closes the joints between materials.
Protecting waterproofing investments
Waterproofing membranes are buried under finishes and traffic. Proactive maintenance catches failures before damage spreads.
Frequently Asked Questions
Stop the water. Protect the structure.
Waterproofing failures compound over time. A waterproofing contractor who diagnoses first stops the damage instead of chasing it.