Basement & facade waterproofing in Brooklyn
Old row houses leak in predictable places: the cellar wall under the stoop, the areaway, the parapet and the top-floor wall. We find which one is yours.
Brooklyn brownstones and row houses often have cellars with rubble or brick foundation walls and an areaway under the stoop that collects water. Damp walls, efflorescence and puddles after storms usually trace back to drainage at the front areaway or rear yard, cracked joints in the foundation wall, or grading that sends water toward the house.
Above ground, the shared parapet and the top of the facade are the usual suspects for top-floor leaks. Waterproofing there is often a mix of masonry repair and flashing, which is why one contractor looking at the whole building helps.
Buildings we work on in Brooklyn
- Brownstone and row-house cellars and areaways
- Rear extensions and yard-level walls
- Top-floor leaks at shared parapets
- Walk-up and mixed-use basements
What Brooklyn owners should know
General information only, not legal advice. Confirm requirements with the issuing NYC agency.
HPD violations
Leaks into rental apartments are cited by HPD; fixing the exterior source supports the correction.
Permits
Most waterproofing doesn’t need a DOB permit, but excavation near foundations or work affecting the sidewalk may. We’ll go over it for your job.
Landmarks
Visible exterior coatings or sealers in a historic district generally need LPC review.
Flooding
NYC DEP offers flood-prevention guidance for homeowners, including backwater valves and drainage.
Waterproofing services in Brooklyn
- Basement waterproofing
- Foundation waterproofing
- Below-grade waterproofing
- Facade waterproofing
- Roof & parapet waterproofing
- Leak investigation
Related:
Waterproofing questions in Brooklyn
Interior or exterior waterproofing for a Brooklyn row house?
Exterior excavation is often limited by the stoop, neighbors and sidewalk, so many row-house basements get crack repair and interior water management, with exterior work where it’s accessible.
Why does my areaway flood?
Usually a clogged or undersized drain, or grading that sends water toward the door. We check the drain and surrounding concrete first.
Can you stop a top-floor leak at the parapet?
Usually, through repointing, coping repair and flashing at the roof edge. See also our Brooklyn masonry and roofing pages.
Waterproofing in other boroughs: Queens · Manhattan · The Bronx · Staten Island
Other services in Brooklyn: 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 Brooklyn?
Tell us what’s going on and we’ll schedule a free estimate.