The short answer
How Wind-Driven Rain Exploits Weaknesses
During a thunderstorm, rain rarely falls straight down. High winds can push it almost horizontally against your home's exterior. This wind-driven rain hits your windows with significant force. That pressure allows water to infiltrate any small opening it finds, even ones that stay dry during a gentle rain.
This sideways rain can overwhelm the window's weather-stripping and drainage systems. It seeps behind siding or trim, finding paths indoors. If the seal between the window frame and your house wall is compromised, water enters easily. This is a common failure point after years of expansion and contraction.
Common Window Failures That Cause Leaks
The sealant or caulk around your window frames is your first defense. Over time, it dries out, cracks, and pulls away from the surface. Once it fails, water has a direct path inside. Checking and replacing old caulk is a critical part of home maintenance, especially before storm season.
Window seals can also fail internally. Double-pane windows have a sealed insulating glass unit. If this seal breaks, you might see fogging, but it can also allow water ingress during a storm. The weep holes at the bottom of the frame, designed to drain water out, can become clogged with dirt and debris.
- Deteriorated or missing exterior caulking
- Failed internal seals on insulated glass units
- Clogged drainage holes (weep holes) in the frame
- Warped, rotted, or cracked window sills
- Loose or damaged flashing around the window
- Shrunken or hardened weather-stripping
When the Leak Isn't the Window Itself
Water dripping from your window might not originate there. Water can travel. A leak higher up on your wall or roof can run down inside the wall cavity and exit near a window frame. This makes the window appear faulty when the real issue is elsewhere.
Inspect the areas above the leaking window. Damaged siding, compromised roof flashing, or clogged gutters can direct water behind your walls. If gutters overflow during heavy rain, that water cascades down your siding and can be forced into window openings. Proper roof and gutter maintenance is key to preventing this.
Immediate Actions to Take After a Leak
Your first step is to contain the water. Use towels, buckets, and a wet-dry vacuum to remove standing water. Move furniture and rugs away from the area. This helps prevent secondary damage like stained walls or warped flooring. Acting quickly limits the damage.
Next, promote drying. Wipe all surfaces dry and use fans to increase air circulation. If the leak soaked drywall, insulation, or carpet, these materials can stay wet inside. In Baltimore's humid subtropical climate, this trapped moisture can lead to mold growth within 24 to 48 hours.
When to Call for Professional Water Damage Help
If water has soaked into drywall, insulation, or subflooring, you need professional drying. These materials hold moisture you cannot see or feel. Local water damage pros use moisture meters and thermal imaging to find all the wet areas, a process called moisture mapping.
Without complete structural drying, hidden moisture causes mold and wood rot. The pros use industrial air movers and dehumidifiers to dry the structure properly. They can also help identify the exact source of the leak to prevent a recurrence, which may involve a roofer or window installer.
- Water has soaked into drywall, insulation, or flooring
- You notice a musty odor or visible mold growth
- The leak area is large or you can't find the source
- Wood framing or sills feel soft or spongy
- You have concerns about electrical safety near the water
- The leak occurred in a multi-story home
Talk to someone now
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (410) 237-0394Frequently asked questions
Can I just caulk over the leak to fix it?
Caulking over a leak is a temporary exterior fix at best. If water got inside the wall, the interior materials are still wet and need drying. Also, the real leak source might be a failed seal or clogged drainage inside the window frame itself.
Does homeowners insurance cover storm-related window leaks?
It might, if the leak caused sudden, accidental water damage to your home's interior. Damage from long-term wear and tear or lack of maintenance is typically not covered. Policies vary, and your insurer decides what is covered. Always document the damage with photos.
How can I prevent my windows from leaking in future storms?
Inspect and replace cracked caulk annually. Ensure window weep holes are clear of debris. Keep gutters clean and downspouts directed away from your foundation. Consider upgrading to storm windows or more durable, modern windows with better weather seals if yours are old.
More questions and answers
- Why Do Tile Roofs Crack and Leak After Decades of Sun Exposure?
- Can Too Much Humidity Cause Mold Without Any Leak?
- Why Is My Wall Wet but There's No Visible Leak?
- Will Opening Windows Dry Out a Flooded Room Fast?
- Can Water Stains on a Brick Fireplace Indicate a Serious Leak?
- How Do Pros Find the Source of a Roof Leak?
- All articles