Basement Waterproofing
A dry basement, guaranteed.
Protecting your basement from water intrusion is critical to maintaining the safety and value of your property. Our basement waterproofing solutions provide a comprehensive defense against moisture, leaks, and flooding that can compromise your home's structure and lead to issues like mold, mildew, and foundation damage.
- Free on-site inspection within 48 hours
- Root-cause diagnosis, not patch work
- Lifetime warranty on qualifying structural repairs
Here's what to look for.
Catch any of these early and you'll save thousands. Ignore them and the problem compounds, fast.
Why this is happening.
Understanding the cause is half the repair. Symptoms come back when root causes aren't addressed.
Hydrostatic Pressure
Groundwater pressure pushes water through any crack or porous concrete.
Poor Drainage
Inadequate exterior drainage sends water toward the foundation instead of away.
Failed Waterproofing
Original membrane has degraded or was never installed properly.
Foundation Cracks
Cracks provide a direct path for water to enter the basement.
How we fix it, right.
We match the method to the damage, not the other way around. No one-size-fits-all.
Interior & Exterior Drainage Systems
French drains and perimeter drains channel water away from your foundation.
Sump Pump Installation
High-performance pumps effectively remove water that collects in your basement.
Waterproof Coatings & Membranes
Specialized coatings create a protective barrier on walls and floors.
Foundation Crack Sealing
Repairing and sealing cracks to stop water from seeping in at the source.
Crawl Space Encapsulation
Prevents moisture buildup and improves air quality in homes with crawl spaces.
Manufacturer-grade. Brand-named.
We don't use hardware-store filler. Every product below is sourced from manufacturers that don't sell to DIYers, and we're trained directly with most of them.
Interior drain tile system
Perforated drain pipe in a clean stone bed around the perimeter, daylighted to a sump pit. Captures water at the wall-floor cove joint where most basement leaks enter.
Sump pump system
Sized to the water volume your site actually generates (not a one-size-fits-all box). Battery backup keeps the basement dry through power outages — exactly when storms hit.
EZ Breathe ventilation system
Patented basement and crawl-space ventilation that actively removes moisture, allergens, and gases. Pairs with the drainage system to keep humidity in spec long-term.
Exterior rubberized asphalt membrane
When excavation is the right answer, we apply a continuous black waterproofing membrane across the exposed foundation face. This is what should have been there from new construction.
Polyurethane crack injection
For active leaking cracks discovered during the waterproofing work. Reacts with moisture, expands to full wall depth, flexes seasonally.
From your call to the warranty document.
Honest day-by-day expectations. No mystery scheduling, no "we'll be there next week" that turns into next month.
Inspection + moisture mapping
Free on-site visit. Thermal imaging, moisture meter readings on every wall section, and water-path tracing. We diagnose interior vs. exterior approach with documented numbers.
System design + permit (if needed)
Written quote with interior drain tile layout, sump pump specs, and any exterior drainage corrections. CT/NY municipal permits handled by us where required.
Installation
Interior drain tile in concrete trench around perimeter, sump pump and discharge line, vapor barrier on walls, and any wall-crack injection feeding the leak. Containment sheeting protects finished spaces.
Test + walkthrough
Live water test of the sump system, walkthrough with you, signed warranty document. Photos and moisture readings handed off for your records.
Real pricing for waterproofing in CT & NY.
Interior perimeter drain tile + sump pump + sealed wall section. The most common waterproofing system we install in CT and NY basements with chronic moisture.
Three factors do the heavy lifting.
Interior vs. exterior approach
Interior drain tile + sump runs $4,000–$12,000 depending on perimeter length. Exterior excavation + membrane runs $8,000–$25,000+ but addresses the source. We recommend the right one for your specific water path, not the higher-ticket one by default.
Active vs. preventive
Already-flooding basements need the full system. Damp/efflorescing basements may only need a partial system or targeted crack injection. Honest scoping = honest price.
Drainage corrections outside
If downspouts, grading, or yard drainage are dumping water at the foundation, the interior system has to fight more water. We correct exterior drainage as part of the scope when it's clearly the upstream cause.
Interior drainage system vs. surface coating only
Side-by-side, what changes when the repair is done right.
Every building type.
From a single-family hairline crack to municipal-scale structural work.
Residential
French drains, vapor barriers, and exterior drainage systems, keep your basement dry and your family safe from mold and structural damage.
Commercial
High-capacity drainage systems, industrial-grade waterproof coatings, and reinforced sealing, built for demanding commercial environments.
Healthcare
Low-impact installation of drainage systems, moisture barriers, and sump pumps, protecting sterile environments and patient safety.
Municipal
Durable, large-scale drainage systems and exterior sealing for schools, libraries, and public offices.
Historical Buildings
Non-invasive methods like capillary waterproofing that respect architectural integrity.
Start with a self-check.
Tap the crack types below to understand what's happening with yours. Then send us a photo, we'll confirm and quote.
Inner Corner Crack
Crack at the inside corner where two foundation walls meet. The most critical pattern, almost always structural.
We don't patch. We fix permanently.
Every structural repair restores the section with a stronger, more sustainable material than what originally failed. If a crack is identified as structural, the only honest fix is to rebuild that section with a superior material, since the original already failed once. That's not an upsell, it's the rule that keeps a lifetime warranty real.
Waterproofing, answered.
The questions homeowners actually ask us when waterproofing comes up at the inspection.
How much does basement waterproofing cost in CT and NY?
Most homeowners spend $7,500–$10,000 for a complete interior drainage system (perimeter drain tile + sump pump + battery backup + sealed wall section). Full residential range: $3,000 (partial system on a small problem area) to $25,000+ (full exterior excavation with new membrane). The honest scoping comes from the on-site inspection — we don't quote over the phone.
Interior drainage vs. exterior excavation — which do I need?
Interior drainage handles 80% of residential basement leaks at a fraction of the cost. Exterior excavation is the right answer when (a) the foundation has multiple visible cracks on one outside wall, (b) the original waterproofing has fully failed and groundwater is hitting the wall constantly, or (c) you've already tried interior fixes that didn't last. Greenwich exterior case study on /recent-projects/ shows a real example.
Will the work damage my finished basement?
We use full containment sheeting, dust suppression, and protect finishes during the cut and trench. Installing interior drain tile does require breaking out a 12-inch strip of concrete floor at the wall-floor joint and re-pouring it after the pipe is in. Anything finished within that strip (drywall, baseboard) needs to come off. We document everything with before/during/after photos.
How long does installation take?
Most full interior drainage systems are 2–4 days on-site. Smaller targeted jobs (one wall section + sump) can finish in 1–2 days. Exterior excavation jobs run longer (3–7 days) depending on length of the affected wall and access for excavation.
Do you install sump pumps separately, or only as part of a system?
Both. If your existing drainage tile is fine but the sump pump is failing or undersized, we replace just the pump and add a battery backup. Most calls end up needing the full system, but we'll honestly scope yours and quote what's actually needed.
What about humidity and mold after the system is installed?
We pair every interior drainage system with proper ventilation — typically the EZ Breathe system (certified installers since 2026) — so the basement stays in spec on humidity. A drained basement that still hits 70% relative humidity will grow mold; we size both pieces together.
Does waterproofing qualify for the lifetime transferable warranty?
Waterproofing carries its own warranty — workmanship from us plus manufacturer coverage on the sump pump and drainage components, typically 5+ years documented in writing. Lifetime transferable coverage is reserved for structural repairs paired with full-wall carbon fiber. The two-tier breakdown is on the lifetime warranty page.
Can you tie waterproofing into a foundation crack repair?
Yes — and that's the most durable combination when both are needed. We seal active cracks with polyurethane injection at full wall depth, install drainage to capture any future water at the cove joint, and (when structural) reinforce with carbon fiber. One crew, one schedule, one warranty package.
Free inspection.
Straight answers.
No pressure, no obligation. On-site diagnosis, written quote, lifetime warranty on every qualifying repair, financing available.
Four steps from crack to peace of mind.
No pressure, no upsells. We diagnose honestly, quote transparently, and back every job with a written warranty — lifetime transferable on qualifying structural repairs.
Initial Inspection
Free on-site visit. We identify every crack, measure moisture, and diagnose the underlying cause, not just the symptom.
Consultation & Planning
Sit down with our project manager. You'll see photos, hear options, and leave understanding exactly what's happening beneath your property.
Transparent Quote
A detailed, itemized proposal. No hidden fees, no surprise change orders. The price we quote is the price you pay.
Repair & Protect
Our crew completes the work with minimal disruption. Qualifying structural repairs are backed by our lifetime transferable warranty; other work carries a documented workmanship warranty.
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Ready to fix your waterproofing?
Free on-site inspection within 48 hours. Honest diagnosis, transparent pricing, lifetime warranty, and financing available.