Waterproofing in Manhattan: facades, terraces & below grade
In Manhattan, water comes in from the top, the sides and below the sidewalk. We trace the leak first, then fix the detail that’s failing.
Setback terraces, rooftop bulkheads and parapets are the classic sources of top-floor leaks in Manhattan buildings. Wind-driven rain pushes through open mortar joints and failed caulking at windows, so a leak on one floor may start a floor or two above. We walk the building inside and out and explain where we think the water is entering before recommending repairs.
Below grade, many Manhattan buildings have cellars and sidewalk vaults that extend under the public sidewalk. Vault roofs, areaways and foundation walls can let water into basements, storage and boiler rooms, and repairs there often overlap with sidewalk work.
Buildings we work on in Manhattan
- Setback terraces and roof decks on co-ops and condos
- Parapets, copings and bulkheads
- Sidewalk vaults and areaways under the sidewalk
- Below-grade commercial and storage spaces
What Manhattan owners should know
General information only, not legal advice. Confirm requirements with the issuing NYC agency.
Local Law 11 / FISP
Leaks often accompany facade conditions flagged in FISP reports; waterproofing and sealant details may be part of the repair scope your QEWI sets.
HPD violations
Water infiltration into rental apartments is cited by HPD. Correcting the exterior source helps the interior repair last.
Sidewalk vaults
Vaults under the sidewalk are generally the property owner’s responsibility; work affecting the sidewalk generally needs a DOT permit.
Building rules
Co-op and condo alteration agreements and access rules usually apply to terrace and roof work.
Waterproofing services in Manhattan
- Basement waterproofing
- Foundation waterproofing
- Below-grade waterproofing
- Facade waterproofing
- Roof & parapet waterproofing
- Leak investigation
Related:
Waterproofing questions in Manhattan
Our terrace is leaking into the apartment below. Who fixes it?
Responsibility depends on your proprietary lease or condo documents. Technically, the fix is usually at the terrace membrane, drains, door saddle or parapet flashing; we’ll identify which.
Can you waterproof a sidewalk vault?
We can assess vault leaks and below-grade walls and explain options. Some vault conditions need an engineer’s evaluation first.
Do you seal brick facades?
Where appropriate. Sealing a wall with open joints traps water, so repointing usually comes first. We’ll tell you which your wall needs.
Waterproofing in other boroughs: Brooklyn · Queens · The Bronx · Staten Island
Other services in Manhattan: Masonry · Tuckpointing · Concrete · Roofing
Waterproofing guides
Plain-English answers to the questions NYC owners ask us most, with links to the official City sources.
7 Signs Your Brick Needs Repointing (and What Proper Repointing Involves)
Eroded and cracked joints, spalling brick, efflorescence and interior damp — what they mean and how proper repointing is done.
Read the guide →GuideBasement Waterproofing Options for NYC Homes: What Actually Works
Figure out where the water comes from, then compare drainage fixes, crack injection, interior systems and exterior membranes.
Read the guide →Need waterproofing work in Manhattan?
Tell us what’s going on and we’ll schedule a free estimate.