Commercial Window Leak Repair
Forensic water-intrusion diagnosis and permanent leak repair for commercial windows, storefronts, and curtain-wall systems across NJ. We find the actual source — sealant, flashing, or framing — and fix it once.
Commercial Window Leak Repair
Commercial window leaks rarely come from where the water shows up. We follow the water back to its real entry point using systematic methodology — sealant inspection, flashing review, and ASTM E1105 spray-rack water testing where needed — then rebuild the failed detail to permanent watertight condition. We service offices, retail, restaurants, medical buildings, and industrial properties throughout New Jersey.
When water shows up inside a commercial building near a window, the first instinct is to recaulk and hope. That works about 30% of the time. The other 70%, the leak comes back at the next nor'easter because the actual failure is up the wall, behind the EIFS, or at a head-flashing detail that hasn't been touched since 1998. We do this work the right way: trace the water path, identify the failed component, repair the failed component, and document what we did so your facility team has a record.
Most NJ commercial buildings we work on are 20-50 years old. The original sealants have far exceeded their 10-15 year service life. Aluminum frames have moved through 30+ freeze-thaw cycles each winter. Roofing trades have walked the parapets and disturbed coping flashing. By now leaks are inevitable — the question is whether you fix them with a band-aid or a permanent repair.
How commercial leaks actually happen
Failed perimeter sealant is the #1 cause. Commercial silicone has a 10-20 year service life under UV and thermal cycling. Past that, it loses adhesion at the substrate, opens hairline cracks, and lets water through. Symptoms: stains directly below window heads, paint blistering at jambs.
Failed weep system is #2. Aluminum storefront and curtain wall systems are designed to leak — water that gets past the gasket is supposed to drain out the bottom through weep holes. If those weeps clog with sealant, paint, or debris, water pools in the sill track and finds its way through the frame's interior face. Symptoms: leaks during heavy rain only, water at the bottom corners.
Cross-trade failure is #3. The leak shows up at the window but the entry point is actually a parapet coping, an EIFS termination above, a kickout flashing missing at a roof-wall junction, or a stucco crack two floors up. Water travels horizontally inside the wall and exits where it can, often at the window head. Symptoms: leaks that don't correlate to wind direction at the window, leaks that appear hours after rain stops.
Glazing gasket failure is #4. The interior or exterior pressure-equalization gaskets harden and lose their compression set. Water bypasses the gasket and ends up in the glazing pocket, then either drains out the weep (good) or backs up into the building (bad).
Substrate cracking is #5 and the worst to find — fine cracks in the surrounding stucco, brick, or concrete that admit water during driven rain only.
Our diagnostic process
We don't quote a sealant job sight-unseen. Every leak gets a site visit first. Our standard intake captures: building age, frame system (storefront, curtain wall, punched), wall cladding (brick, EIFS, metal panel, precast), elevation orientation, when the leak appeared, and which weather conditions reproduce it.
On-site, we inspect the suspect opening top-down. Coping flashing, parapet conditions, and roof-wall transitions get checked first. Then we move to the window: sealant condition, gasket compression, weep hole patency, frame anchor visibility. We use a moisture meter on the interior wall to map the wet area and trace it upward.
When the visual inspection doesn't pinpoint the source — common on EIFS or stucco buildings — we set up an ASTM E1105 spray rack. This calibrated water test lets us isolate components: spray the head only for 5 minutes, see if water appears; spray the jamb only, repeat. That isolation tells us exactly which detail to repair.
Every diagnostic visit ends with a written report: photos of conditions, the identified failure mode, the recommended repair, and whether other elevations need preventive work.
Buildings and clients we serve
Office buildings — single and multi-tenant. Newark, Jersey City, Hoboken, Princeton, and the Route 1 corridor in Mercer/Middlesex.
Retail and restaurants — storefront leaks at parapets and signage penetrations are constant in mall and strip-center environments throughout Bergen, Essex, Union, and Monmouth.
Medical office buildings and clinics — leaks in sterile environments require coordinated after-hours work; we schedule around clinical hours.
Industrial and warehouse — large punched openings in tilt-up and CMU walls, often with original 1980s-era aluminum framing.
Multifamily — condo associations and rental property managers needing recurring window inspection programs.
Our Process
- 1Intake callWe capture building details, leak history, and a description of where water shows up. Property managers can email photos before our visit so we arrive prepared.
- 2Site inspection (typically 1-2 hours)Visual inspection of the affected opening and adjacent details, moisture mapping, photo documentation. For most leaks this identifies the source.
- 3Water test (when needed)ASTM E1105 calibrated spray rack to isolate the failure mode when visual inspection is inconclusive. Common on EIFS, stucco, and multi-detail walls.
- 4Written diagnostic reportWithin 48 hours: photos, identified failure mode, recommended repair scope, line-item pricing, and whether other openings should be reviewed proactively.
- 5Repair workSealant replacement, flashing rebuild, gasket replacement, weep clearance, frame re-anchor — whatever the diagnostic identified. Performed during business hours by default; after-hours and weekend scheduling available for tenant-occupied space.
- 6VerificationFinal water test on the repaired component to confirm the fix. Hand-off documentation to your facility team including a maintenance schedule for the repaired details.
Materials We Use
The Precision Difference
About Commercial Window Leak Repair in NJ
Why does my office window leak only during heavy rain?+
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What is ASTM E1105 water testing and when do I need it?+
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Serving All 21 New Jersey Counties
We service Atlantic County, Bergen County, Burlington County, Camden County, Cape May County, Cumberland County, Essex County, Gloucester County, Hudson County, Hunterdon County, Mercer County, Middlesex County, Monmouth County, Morris County, Ocean County, Passaic County, Salem County, Somerset County, Sussex County, Union County, Warren County. From our Garfield, NJ shop we cover the entire state — same-day measurement available in Bergen, Passaic, Essex, Hudson, Morris, Union, and Middlesex; next-day in Monmouth, Ocean, Mercer, Somerset, and Hunterdon; 2-day for Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester, Salem, Sussex, and Warren.