Basement Waterproofing in Scarsdale, NY
Bronx River flooding and 1920s Tudor foundations put Scarsdale basements under constant groundwater pressure.

Why Scarsdale basements need waterproofing
Scarsdale's basements are defined by two things: the Bronx River corridor that floods the low-lying flats, and the town's stock of 1920s-era Tudor and colonial homes with stone and early-concrete foundations. Homes in the river flats and near Garth Road see recurring groundwater and backwater intrusion, while the older foundations elsewhere seep through hairline cracks and porous concrete as the water table rises each spring.
We waterproof Scarsdale homes by first separating true groundwater from above-grade sources with thermal and moisture mapping. Flood-flat properties typically need interior drainage with a battery-backup sump sized for the Bronx River's flashy behavior; the drier Tudor foundations more often need crack injection, exterior grading, and vapor control. Note that basement waterproofing in New York is preventive work — we're transparent that homeowner insurance rarely covers it.
How we waterproof Scarsdale basements
We tailor the system to the source of the water. See the full detail on our basement waterproofing hub.
Interior Drain Tile + Sump
Perimeter French drain to a battery-backup sump — the standard fix when exterior excavation isn't practical.
Stego Vapor Barriers (ASTM E1643)
Below-slab barrier that stops vapor migrating up through soil — the top source of chronic basement humidity.
Foundation Crack Injection
Polyurethane or epoxy full-depth seal for leaking foundation cracks under hydrostatic pressure.
Exterior Excavation + Membrane
Dig out the wall, apply waterproof membrane, drain to daylight — the durable fix for chronic exterior intrusion.
EZ Breathe Ventilation
Whole-basement moisture, mold-spore, radon and VOC removal — the preventive final step after a dry-out.
Grading + Downspout Correction
Often the cheapest, highest-impact fix: slope soil away from the foundation and move roof water off the walls.
Real waterproofing work near Scarsdale
Selected photos from waterproofing assessments and projects across Fairfield + Westchester. The pattern is consistent: find the source, install the right system, verify with moisture mapping.




Scarsdale basement waterproofing — FAQ
Will homeowners insurance cover basement waterproofing?+
Preventive waterproofing is almost never covered — policies pay for sudden, accidental water events, not moisture prevention. If waterproofing is needed to restore damage from a covered event (a burst pipe, for example), it can be folded into that claim scope. We tell you honestly during the free assessment whether any part is claimable.
How do you decide between interior and exterior waterproofing?+
It depends on the source, which we identify first with thermal imaging and moisture mapping. Hydrostatic pressure from outside the foundation usually calls for exterior grading, drainage or membrane; vapor and seepage through walls or slab is handled with interior systems (drain tile, Stego, EZ Breathe). Often a combined approach is best — but we never prescribe before we've found the actual water source.
How is 911 Storm different from a typical waterproofing contractor?+
We're an IICRC-certified restoration company first, waterproofers second — so we approach basement moisture as a building-science problem and use thermal imaging + moisture mapping to find the real source, not just sell a system. If your problem is actually from above (roof, plumbing), we'll tell you. If it's groundwater, we install the right system with the right manufacturer warranty.
Our Scarsdale home floods near the Bronx River every spring — what actually helps?+
For Bronx River-adjacent homes the workhorse solution is an interior perimeter drain feeding a high-capacity battery-backup sump, because the river's groundwater is flashy and power often fails during the same storms. We combine that with grading and downspout correction to reduce the volume reaching the foundation. It won't stop a true river flood, but it keeps the everyday high-water-table seepage out of your basement.
Basement waterproofing in nearby towns
Free basement waterproofing assessment in Scarsdale
60-minute response, no obligation, no high-pressure sales. We find the water source before we quote a system.
IICRC Certified • Licensed & Insured • All Major Insurance Carriers