Drafty & leaking
window repair in NYC
Restore safety and security without replacing the entire window frame.
Thermal Envelope high-grade weatherstripping eliminates freezing drafts and lowers HVAC costs
Leak Eradication precision interior and exterior caulking stops rainwater intrusion fast
Acoustic Sealing closing structural air gaps significantly reduces loud NYC street noise
$11M Umbrella Coverage strong liability coverage for your NYC property
The mechanics of
air & water infiltration
A compromised building envelope leaks energy and allows moisture damage.
WHY WINDOWS LEAK AIR AND WATER
A window works as a multi-layer barrier system, with weatherstripping, caulk joints, sash seals, and drainage channels all working together to block air and rain. NYC’s climate—freeze-thaw winters, heavy spring rains, and summer heat—wears these components down over time.
Weatherstripping compresses and loses its elasticity. Caulk shrinks and cracks. Weep holes clog with debris.
THE HIDDEN COSTS OF WAITING:
Energy Loss:
Drafty windows lose 25-40% of your heating and cooling through air leakage. Your HVAC system has to work harder to compensate, driving utility costs up by hundreds of dollars per year per unit.
Water Damage That Spreads:
Water leaking through window frames does more than leave stains—it can soak drywall, rot wood sills, and lead to mold behind the walls.
Structural Damage:
Repeated rain leaking through a window frame can rot wood framing, rust steel lintels, and damage masonry. In pre-war buildings, this can lead to brick spalling and lintel failure.
THE BIG APPLE sealing protocol
We diagnose leak paths, restore thermal barriers, and deliver long-term weather-tight performance.
Schedule a site visit
Thermal & moisture diagnostics
Using thermal imaging and pressure testing, we identify exact air-leak locations and moisture entry points. A draft at the window sill requires a different repair than air leaking around the trim—your repair is targeted, not generic.
Surgical seal restoration
For drafty window repair, we remove degraded weatherstripping and install commercial-grade replacements matched to your window type: silicone bulb seals for casements, V-strip bronze for double-hung windows, and EPDM gaskets for sliders. For window leak repair, we remove failed caulk, prep surfaces down to the substrate, and apply architectural-grade polyurethane or silicone. For double-hung windows, we install spring bronze or reinforced foam in precise tolerance gaps.
Drainage & ventilation engineering
We clear weep holes, confirm proper sill slope, and check flashing integration. The result is a window that blocks air and rain while allowing moisture to drain as designed, preventing trapped condensation and rot.Big Apple Window Company at work
More than 2 decades of experience in property maintenance.
Stop the energy loss
See the difference. We eliminated air leaks and rain intrusion while preserving the original windows and architectural details.
BEFORE
AFTER
Engineering specifications & guarantees
We believe in clear specs and straight answers. Compare our materials, safety standards, and coverage with anyone in NYC.
Weatherstripping standards
Commercial-Grade Only. We use Q-Lon foam, Schlegel silicone bulb seals, or spring bronze-never cheap adhesive-backed felt. For drafty windows, we install compression seals rated for 50+ mph wind loads and 100,000+ cycle durability.
Sealant technology
Architectural Polyurethane & Silicone. We use Sikaflex, Tremco Spectrem, or Dow Corning 795 to seal drafty windows-materials designed for 25+year of UV exposure and movement. We do not use acrylic latex that breaks down in a few years.
Warranty protection
2-Year Seal Performance Warranty. If a draft returns or window leaks during rain within 24 months, we come back and repair it. No service charge. No runaround.
Risk management
$11 Million Umbrella Coverage. Your property is backed by strong liability coverage, including full NY Labor Law protection (No “Action Over” exclusions). For co-ops and condos, we coordinate with building management and provide documentation.
EXPERIENCE THE NEW STANDARD
Join 200+ landmark buildings and 10,000+ homeowners.
While we’re on-site
Our technicians are trained to spot façade issues while working on high-rise buildings.
