What to Do If Your Replacement Windows Leak

You’ve invested in new windows to shield your Calgary home from freezing winters and relentless snowstorms. But instead of a cozy, leak-free home, you spot water trickling inside. It’s frustrating and raises an important question — what’s causing the leak, and how can it be fixed?

Leaking replacement windows aren’t just an inconvenience; they can lead to mold growth, costly water damage, and energy inefficiency. Here’s how to identify the causes, take immediate action, explore professional solutions, and prevent future window leaks — all tailored to Calgary’s demanding climate.

Understanding the Problem: Why Do Replacement Windows Leak?

Leaking windows almost always have a root cause. In Calgary’s unique climate, here are the main culprits:

1. Poor Installation: A Leading Cause of Window Leaks

Improper installation undermines even the highest-quality windows. Here are specific errors that lead to leaks:

• Improper Shimming: Shims level and secure the window. Incorrect placement creates uneven gaps, allowing moisture to enter.
• Lack of Insulation: Installers must fill spaces around the window frame with spray foam or backer rods. Gaps lead to drafts and water seepage.
• Sealant Application Errors: Using the wrong sealant type (e.g., interior-grade caulk) or uneven application weakens the window’s moisture barrier.

Example: During Calgary’s frigid winter, improper sealing allows warm indoor air to escape, creating condensation that damages both the frame and surrounding structure.

2. Window Materials and Their Suitability for Calgary

The performance of window materials varies depending on Calgary’s extreme temperature shifts:

• Wood Frames: While visually appealing, wood is susceptible to moisture absorption, which can cause warping and cracking over time if not maintained properly.
• Aluminum Frames: Aluminum conducts cold, leading to significant condensation buildup during freezing temperatures.
• Vinyl Frames: Vinyl is low-maintenance, affordable, and resistant to moisture and warping, making it a strong choice for Calgary’s temperature swings.
• Fiberglass Frames: Fiberglass offers excellent durability and minimal thermal expansion, making it well-suited for cold climates.

Important Note: While vinyl and fiberglass often perform well in cold climates, the “best” material depends on factors like the home’s design, energy efficiency goals, and maintenance priorities. Consulting a local professional when looking to replace windows in Calgary can help determine the right material for your specific needs.

3. Calgary’s Harsh Weather Conditions: How Extreme Cold Impacts Windows

• Thermal Expansion and Contraction: Calgary’s rapid temperature fluctuations (like during Chinooks) cause materials to expand and contract, stressing seals and joints. Over time, this weakens the window’s ability to prevent leaks.
• Snow and Ice Accumulation: Heavy snowfall can pool against window sills, while freezing rain can penetrate cracks and gaps.
• Condensation Formation: A mix of cold outdoor air and humid indoor air can cause water droplets to form on windows, which may seep into cracks if the seals are compromised.

Emergency Leak Mitigation: Quick Fixes to Stop Damage

When a leak occurs, immediate action can minimize damage until a professional repair is completed:

1. Identify and Assess the Leak

• Inspect windows for visible entry points: gaps in the caulking, damaged seals, or water pooling on the sill.
• Use a flashlight to check for gaps or cracks around the window frame.

2. Temporary Solutions for Leaking Windows

While these fixes are not permanent, they can buy you time:

• Reapply Caulking: Use weather-resistant silicone caulk to seal visible cracks. Avoid interior-grade caulk, as it won’t withstand Calgary’s cold.
• Install Weather Stripping: Adhesive-backed weather stripping around the sash blocks minor drafts and moisture seepage.
• Apply Window Sealant Film: Temporary sealant kits can help waterproof small cracks during winter storms.

3. Protect Your Home from Water Damage

• Dry the Area: Use towels, fans, or a dehumidifier to remove moisture and prevent mold growth.
• Contain Water: Place plastic sheeting or towels around the sill to catch excess water.

Professional Solutions: How Experts Fix Leaking Windows

Addressing persistent window leaks requires expertise. Here’s what professional window specialists in Calgary do:

1. Detailed Leak Diagnosis

Experts use specialized tools like thermal imaging and moisture meters to pinpoint:

• Gaps in seals, caulking, or insulation.
• Flashing issues (critical for redirecting water).
• Structural weaknesses in the window frame.

2. Repairs and Replacement

Depending on the cause of the leak, professionals will:

• Replace Faulty Seals: Degraded seals are removed and replaced with high-performance materials like polyurethane or silicone, which perform well in freezing temperatures.
• Reinstall the Window Correctly: Poorly installed windows may need to be removed and reinstalled with proper shimming, sealing, and insulation techniques.
• Repair or Add Flashing: Proper flashing prevents water from pooling around the window and redirects moisture away.

3. Recommendations for Long-Term Performance

Professionals often suggest window replacements in Calgary when windows have extensive damage or poor performance. This may include:

• Triple-Pane Glass: Provides superior insulation, reducing energy loss and condensation.
• Climate-Appropriate Seals: Seals designed for cold climates maintain flexibility and durability despite temperature fluctuations.
• Durable Frames: Vinyl and fiberglass frames are ideal options for energy efficiency and low maintenance.

Preventative Measures: Ensuring Leak-Free Windows Year-Round

Preventing leaks comes down to proactive maintenance and choosing materials suited for Calgary’s climate.

1. Regular Inspections

• Check windows every spring and fall for cracked seals, peeling caulking, or signs of condensation.
• Inspect the window frame for warping or moisture damage.

2. Maintain Caulking and Weather Stripping

• Reapply silicone-based caulking every 2-3 years to maintain a tight seal.
• Replace worn or damaged weather stripping to reduce drafts and moisture entry.

3. Upgrade to Energy-Efficient, Durable Windows

If it’s time to replace windows in Calgary, consider options that deliver performance and longevity:

• Triple-Pane Glass: Reduces energy loss and condensation by adding extra layers of insulation.
• Fiberglass or Vinyl Frames: These materials resist warping, cracking, and moisture infiltration better than wood or aluminum.
• Cold-Weather Seals: Seals made from silicone or polyurethane offer long-lasting durability in extreme cold.

Note: While these upgrades can save money over time, actual savings depend on your home’s insulation, energy costs, and current window condition. Natural Resources Canada provides energy efficiency guidelines to help homeowners make informed choices.

4. Control Indoor Humidity

• Use dehumidifiers or exhaust fans in kitchens and bathrooms to reduce moisture buildup.
• Improve airflow by occasionally cracking windows, even in winter, to balance indoor and outdoor humidity.

Conclusion

Leaking replacement windows are a serious issue, particularly during Calgary’s harsh winters, but they don’t have to disrupt your home’s comfort and safety. By identifying the root causes, addressing problems quickly, and partnering with trusted professionals for window replacements in Calgary, homeowners can find reliable, long-lasting solutions.

Preventative maintenance and upgrades to energy-efficient windows not only stop leaks but also improve energy efficiency, reduce costs, and keep your home warm and dry throughout the winter months.

Facing persistent leaks? Ready to replace windows in Calgary? Contact a trusted local professional today to diagnose, repair, or replace your windows — ensuring your home stays leak-free for years to come.