Exterior Crack Repair & Foundation Waterproofing
Fix the leak from outside. The way it actually stays fixed.
Most contractors will only repair a foundation crack from the inside, because exterior work means digging. We do both, and on a chronic leak the only honest fix is usually exterior. We hand-excavate down to the footer, expose the wall where the water actually starts, repair the crack at full depth, and apply a continuous waterproofing membrane across the affected section. Backfill goes in clean. The basement stays dry. Few contractors in Fairfield CT and Westchester NY still offer this service end-to-end — when homeowners call us specifically for exterior crack repair, it's almost always because no one else would do it.
- 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.
Failed Original Waterproofing
The exterior membrane installed at construction has degraded, cracked, or wasn't installed at all on older homes. Water now moves freely along the outside of the wall.
Stone-Loaded Backfill
Older construction often backfilled with mixed soil and stones. Water channels along the stones to find every microcrack — interior fixes can't address that.
Hydrostatic Pressure
Groundwater builds up against the wall and pushes inward through any imperfection. Without exterior drainage, the pressure never lets up.
Surface Water Mismanagement
Downspouts, grading, or yard drainage pointing toward the foundation deliver water where it can do the most damage. Often paired with the excavation we correct it.
Cracks That Open from Outside Pressure
Some cracks form under outside soil pressure and only seal when the outside face is restored. Interior injection alone won't keep them closed.
How we fix it, right.
We match the method to the damage, not the other way around. No one-size-fits-all.
Hand-Dug Excavation Down to the Footer
We excavate carefully along the affected wall, with proper bracing/forms to keep the trench safe. No big-machine damage to landscaping where it's not needed.
Wall Cleaning & Crack Repair at Source
Once the wall is exposed, we clean the surface and repair any cracks at full depth — typically with polyurethane injection or hydraulic cement, depending on the situation.
Rubberized Asphalt Waterproofing Membrane
Continuous black membrane applied across the entire exposed section. This is the layer that actually keeps water out — it's what should have been there from the start.
Drainage Correction at the Base
While the trench is open, we re-set or install footing drains where appropriate so groundwater is led away from the foundation instead of building up against it.
Clean Backfill
Original stone-loaded fill comes out — clean material goes back in. The wall stays dry because the backfill itself stops being a water highway.
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.
Rubberized asphalt waterproofing membrane
Continuous black membrane applied across the entire exposed exterior face. This is the layer that actually keeps water out — it's what should have been installed at construction.
Polyurethane crack injection
For exposed exterior cracks discovered during the dig. Reacts with moisture, expands to full wall depth, flexes seasonally so it stays sealed through freeze-thaw cycles.
Footing drain pipe + filter fabric
4-inch perforated drain at the base of the wall, daylighted or tied to a discharge point. Captures groundwater before it can build pressure against the new membrane.
Hydraulic cement (water plug)
Immediate water control at any active seepage points discovered during prep, so the membrane bonds to a clean surface.
Clean drainage backfill
Original stone-loaded fill replaced with clean granular material that lets water drain to the footer drain instead of channeling against the wall.
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 + scope
Free on-site visit. We confirm the leak source is exterior (not interior), measure the section, and check access. Written quote with the actual scope before any digging.
Excavation
Hand-dug trench with proper bracing/forms, down to the footer. Original backfill comes out. We document everything — Greenwich case study has the photo of stones removed.
Wall prep + crack repair
Wall surface cleaned, exposed cracks injected at full depth (polyurethane for active leaks, hydraulic cement for active seepage at source).
Membrane + drainage
Continuous rubberized asphalt waterproofing membrane across the entire exposed face. Footing drain installed or re-set where appropriate.
Clean backfill + restoration
Stone-loaded original fill replaced with clean material. Surface restored to grade. Walkthrough + signed warranty doc + photo set for your records.
Real pricing for exterior crack repair in CT & NY.
Hand-excavated trench down to the footer along the affected wall section, full crack repair, rubberized membrane, drainage correction, and clean backfill. Most common scope for chronic basement leaks where interior fixes have failed.
Three factors do the heavy lifting.
Length of wall to excavate
20 ft of wall costs roughly half what 40 ft does. We measure the actual leak source — not the full perimeter — so you only pay for what needs to come out.
Excavation depth + access
Walkouts and stairwells are easier and cheaper than mid-wall foundation digs. Tight access between buildings or over landscaping costs more in time + restoration.
What's underneath
Stone-loaded original backfill (the Greenwich case study) significantly raises labor. Clean soil drops the cost. We can usually tell from the first foot of dig.
Exterior excavation vs. interior crack injection (when both are options)
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
Homes with chronic basement leaks where interior fixes have failed. Walkout basements, stairwells, window wells, and below-grade entrances waterproofed properly from outside.
Older / Historic Homes
Pre-1960 construction across Fairfield and Westchester rarely had real exterior waterproofing. We retrofit it without disturbing the rest of the structure.
Stone & Rubble Foundations
Greenwich, Ridgefield, and other Gold Coast areas have many 19th-century stone foundations. Exterior membrane plus flexible repair compounds is the only honest fix on this wall type.
Commercial
Below-grade office walls, basement-level retail, and commercial walkouts. We schedule excavation around your operation so business doesn't stop.
Pre-Sale Repair
Homeowners selling a property with a known leak issue. A documented exterior fix with photos and a transferable warranty is the cleanest way to move past an inspection finding at closing.
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.
Exterior Crack Repair, answered.
The questions homeowners actually ask us when exterior crack repair comes up at the inspection.
How much does exterior crack repair cost in CT and NY?
Typical exterior excavation + waterproofing job runs $10,000–$15,000 for a single affected wall section in residential basements. Full residential range: $5,000 (small walkout fix) to $25,000+ (long perimeter or stone-loaded backfill that requires heavy hauling). The Greenwich case study on /recent-projects/greenwich-ct/ is a real example.
When is exterior repair worth the cost vs. interior injection?
Exterior is worth it when (a) interior fixes have already failed once or twice, (b) the wall has multiple cracks suggesting failed original waterproofing, or (c) you're pre-sale and need a documented permanent fix that an inspector won't flag. For a single isolated crack on a wall with otherwise intact exterior waterproofing, interior injection is usually the right answer.
Will you damage my landscaping?
We hand-excavate (no machine where it isn't needed) and document the yard before we start. Plantings within the trench line have to come out; we'll typically replant or you can use the opportunity to redesign. Walkways and patios over the excavation path get protected during work and restored after backfill.
How long does the work take?
Most exterior excavation jobs run 3–6 days on-site depending on length of wall and access. Day 1 is excavation, days 2–3 are wall prep + crack repair + membrane, day 4–5 is drainage + clean backfill + grade restoration. We give you a day-by-day schedule before we start.
Why don't most contractors offer exterior repair?
Two reasons. (1) Interior injection is faster, cheaper, and easier to sell — most contractors stop there even when it isn't the right answer. (2) Exterior work is labor-intensive and requires hand-excavation skill plus proper bracing. Few contractors in Fairfield CT or Westchester NY still do it end-to-end. When homeowners call us specifically for exterior work, it's almost always because no one else would do it.
Do I need a permit?
Depends on the municipality. Some CT and NY towns require permits for any foundation excavation; others don't. We handle the permit application and inspection coordination for you when one's required. The free inspection visit is when we confirm whether yours is a permitted job.
Does exterior crack repair come with the lifetime warranty?
Exterior excavation work carries a workmanship warranty plus the manufacturer's coverage on the rubberized membrane — typically 5+ years documented in writing on every job. Lifetime transferable coverage is reserved for structural repairs paired with full-wall carbon fiber reinforcement (different scope). Both warranties are real; the term is just shorter for waterproofing-only work.
What about the original stone backfill — does that come back?
No. The original stone-loaded fill is exactly what created the water-channel problem in the first place — water rolls down through stones and finds every microcrack. We haul it out and replace with clean granular drainage backfill that lets water drop to the footer drain instead of pooling against the wall. That's permanent.
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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Free on-site inspection within 48 hours. Honest diagnosis, transparent pricing, lifetime warranty, and financing available.