Basement Waterproofing in Westport, CT
Saugatuck River and Compo Beach flood-zone homes need waterproofing built for tidal water, not just rain.

Why Westport basements need waterproofing
Much of Westport's most valuable housing sits in genuine flood zones — Compo Beach, Saugatuck Shores, Old Mill, and the neighborhoods lining the Saugatuck River. These homes face tidal groundwater and storm surge, not just rainfall, so a standard interior sump isn't always enough. Older beach cottages and the larger estates alike suffer chronic below-grade moisture from the high coastal water table.
Waterproofing a Westport flood-zone basement means designing for water that comes from below and rises, which often combines interior drainage with battery-backup (or water-powered) sump systems that keep running during the power outages that accompany coastal storms. For slab and crawl-space vapor we install Stego barriers and EZ Breathe; for chronic seepage where excavation is feasible, exterior membrane is the durable fix.
How we waterproof Westport 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 Westport
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.




Westport 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 Westport home is in a flood zone near the Saugatuck — is waterproofing worth it if it can flood anyway?+
Flood-zone waterproofing targets the far more common problem: chronic groundwater seepage and high-water-table vapor between flood events, which quietly drives mold and finish damage. We pair interior drainage with battery-backup or water-powered sumps that survive storm outages. True surface flooding is a separate FEMA/elevation issue, but managing the everyday groundwater is what keeps the basement usable and dry the other 360 days a year.
Basement waterproofing in nearby towns
Free basement waterproofing assessment in Westport
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