Window & Door Leak Repair
Water infiltration around windows and doors causes hidden damage to your walls, insulation, and structure. Our expert flashing and waterproofing services stop leaks at the source for residential and commercial buildings across McHenry and Lake County.
Failed flashing and sealant allowing water infiltration around window openings
Why Do Windows and Doors Leak?
Window and door leaks in masonry buildings are almost always caused by failed flashing, deteriorated sealant, or clogged weep holes. Over time, exposure to Illinois freeze-thaw cycles breaks down the waterproofing systems that keep moisture out of your wall cavity.
Without proper repair, water infiltration leads to rusted lintels, rotted framing, mold growth inside walls, and damaged insulation — problems that escalate quickly in both residential homes and commercial buildings.
Signs You Have a Window or Door Leak:
- Water stains or discoloration on interior walls near windows or doors
- Peeling paint, bubbling drywall, or soft spots around window frames
- Visible gaps or cracked sealant between the window frame and brick
- Musty smell or mold growth on windowsills or door frames
- Efflorescence (white mineral deposits) on brickwork below window openings
Our Repair Process
We trace every leak to its source and apply lasting repairs using professional-grade flashing, sealants, and drainage systems.
1. Leak Diagnosis
We perform a thorough inspection to identify the exact source of water intrusion — whether it's failed flashing, deteriorated sealant, clogged weep holes, or a corroded lintel allowing moisture into the wall cavity.
2. Flashing & Waterproofing
We remove damaged flashing and install new waterproof membrane systems above lintels and around openings. We clear or install weep holes to ensure proper drainage, preventing water from becoming trapped inside the wall.
3. Sealing & Restoration
We apply commercial-grade sealant around all window and door frames, repair any damaged brick or mortar, and restore the finished appearance. Every repair is tested to confirm the leak is fully resolved.
Stop Water Damage Before It Spreads.
Window and door leaks cause hidden damage that gets worse every storm. Get a professional diagnosis and permanent repair today.
Materials & Techniques We Use
Every leak repair uses professional-grade materials designed for permanent waterproofing performance in Illinois weather conditions.
Self-Adhering Flashing Membrane
Rubberized asphalt flashing that bonds directly to masonry and steel lintels, creating a watertight barrier that directs moisture to weep holes.
Polyurethane Sealant
Commercial-grade flexible sealant rated for masonry-to-frame joints that maintains adhesion through freeze-thaw cycles without cracking.
Weep Hole Systems
Properly spaced weep holes with mesh inserts that allow trapped moisture to drain from the wall cavity while preventing insect entry.
Backer Rod
Closed-cell foam backer rod installed behind sealant joints to control depth and ensure proper sealant adhesion on both sides.
Through-Wall Flashing
Extended flashing systems that span the full depth of the wall to redirect water from behind the brick to the exterior face.
Color-Matched Mortar
Type S mortar blended to match your existing joints, ensuring any brick or mortar repair is virtually invisible in the finished wall.
Common Window & Door Leak Issues We Fix
Water intrusion around openings is one of the most common problems in brick buildings across McHenry and Lake County. Here's what we see most often.
Failed Window Flashing
The flashing membrane above the window has deteriorated, torn, or was never installed properly — allowing water to flow directly into the wall cavity behind the brick.
Deteriorated Sealant Joints
Caulk and sealant around window and door frames cracks, shrinks, or pulls away over time, creating gaps where rainwater enters between the frame and masonry.
Clogged or Missing Weep Holes
Weep holes that are blocked by mortar, debris, or paint cannot drain trapped moisture, causing water to accumulate and damage the wall from the inside.
Corroded Lintel Leaks
Rusted lintels above windows and doors lose their waterproof coating, allowing moisture to wick along the steel and drip into the wall cavity and interior.
Mortar Joint Failure Around Openings
Deteriorated mortar joints adjacent to windows and doors allow wind-driven rain to penetrate the wall, especially on exposed sides of the building.
Improper Drainage Slope
Window sills or thresholds without proper slope direct water toward the building instead of away, causing pooling and persistent leaks at the base of openings.
Cost Expectations
Honest, upfront pricing for window and door leak repair in McHenry and Lake County. Every project includes a free on-site estimate.
Sealant Replacement (Per Window)
Remove old caulk, prep surfaces, apply commercial-grade sealant
Flashing Repair (Single Opening)
Remove brick, install new flashing membrane, relay brick
Weep Hole Installation
Drill and install weep holes with mesh inserts along wall base
Lintel Waterproofing
Flash and seal existing lintel to prevent moisture infiltration
Full Window Leak Repair Package
Flashing, sealant, weep holes, and mortar repair combined
Commercial Multi-Opening Repair
Multiple windows/doors with scaffolding and full waterproofing
Prices are estimates and vary based on project scope, materials, and site conditions. Contact us for a free, no-obligation quote.
Frequently Asked Questions
Everything you need to know about window and door leak repair.
Still Have Questions?
Contact us directly — we're happy to answer any concerns about window and door leak repair.
Call (224) 441-5284