How to Fix a Leaky Window: A Simple Guide for Homeowners

Is your home experiencing the inconvenience of air coming through window frames, or perhaps you’ve noticed water pooling around your window sill? Not only are leaky windows a source of frustration, but they can also create chilly drafts and lead to water damage if not repaired promptly. These problems can result in higher energy bills and even mold growth when left unaddressed.

But don’t worry, fixing a leaky window is often a straightforward and cost-effective task, especially with a team like ours on your side. In this guide, our pros at Apex Window Werks will explore the common causes of window leaks, how to spot them, and what to do about them. Whether you’re considering DIY solutions or seeking the expertise of window repair services, our passionate team has got you covered.

Don’t let window leaks disrupt your comfort — learn how to tackle this issue head-on and restore the integrity of your home’s windows!

Why Are My Windows Leaking?

There are a few usual suspects when it comes to leaky windows. Let’s take a closer look at the common culprits:

• Worn-out caulk and seals: Caulk and seals are your window’s first line of defense against the elements. Over time, they can naturally wear down, crack, or shrink, creating tiny openings where water and air can sneak through.
• Clogged drainage holes (weep holes): These small openings at the bottom of your window frame are designed to drain rainwater away. However, they can become clogged with debris like dirt, leaves, or even insects. When this happens, water can build up and eventually find its way inside.
• Improper window flashing: Flashing is a thin material installed around your window frame to create a watertight barrier. If it’s installed incorrectly or gets damaged, it won’t be able to do its job effectively, allowing water to seep in.
• Defective windows: Sometimes, leaks can be due to manufacturing defects or flaws in the window materials themselves. This is usually more noticeable soon after installation.
• Improper installation: Even the best windows won’t perform well if they’re not installed correctly. If the caulking or sealing isn’t done properly, gaps can form and let water and air in.
• Roof or siding issues: Leaks in your roof or siding can sometimes trickle down and appear to be coming from your windows. It’s always a good idea to check these areas for potential problems.
• Design flaws: In some cases, leaks may be caused by design issues with your home, such as inadequate overhangs or cracks in the walls. If you suspect this might be the case, it’s best to consult a professional for advice.

How to Repair a Window Leak

While addressing small air leaks can be a cost-effective DIY project, it’s important to note that these repairs are often temporary, and full-frame window replacement may be necessary for long-term energy efficiency.

Different window leaks call for different solutions. Here are some tried-and-true methods to ensure your windows are airtight and leak-free:

Method 1: Sealing Air Leaks in the Window Frame and Grilles

Caulking is a practical and cost-effective solution to fix a leaky window. Follow this step-by-step guide to effectively seal gaps and cracks:

1. Clean the surface: Grab a utility knife and carefully remove the old caulk or paint from around the leak. Make sure the surface is clean, dry, and free of debris for the best adhesion.
2. Apply caulk: Using a caulking gun, apply a smooth, continuous bead of caulk along the gap or crack. Hold the gun at a 45-degree angle and keep a steady hand.
3. Address excess caulk: Use a putty knife or your finger (wearing gloves, of course) to gently smooth out the caulk and create a nice, even seal. If you notice any gaps or shrinkage as it dries, don’t worry! Just add a little more caulk to ensure a tight seal.

Method 2: Sealing Air Leaks Between the Window Rail and Window Sill

Weatherstripping is like a cozy scarf for your window, sealing out those sneaky drafts. Follow these steps to apply it effectively:

1. Clean and dry: Give the area you’re about to seal a good cleaning with soap and water. Make sure it’s completely dry before moving on.
2. Measure and cut: Measure the width of the window sill, and then cut your weatherstripping to match.
3. Apply and secure: Press the weatherstripping firmly onto both the window rail and the window sill. You want it to stick well, creating a snug seal.
4. Check your work: Do a quick check to make sure there are no gaps or loose ends in the weatherstripping. The candle test is a fun way to do this! Light a candle and hold it near the seal. If the flame flickers, there might still be a tiny leak.

Method 3: Applying Window Film

Think of window film as an invisible shield for your window. It’s a simple, budget-friendly solution that can make a real difference in keeping drafts at bay. Here’s how to apply it:

1. Clean the window: Start with a sparkling clean window. Remove any dirt or smudges so the film adheres properly.
2. Cut to size: Measure your window and cut the film to fit. It’s helpful to leave a little extra around the edges, just to be safe.
3. Soapy water is your friend: Lightly spray the window with a mixture of water and a few drops of dish soap. This will make the film easier to position and adjust.
4. Apply and smooth: Carefully lay the film onto the window, smoothing it out as you go to avoid wrinkles and air bubbles. A squeegee can be helpful for this!
5. Seal the edges: Use a hairdryer on low heat to shrink the film around the edges, creating a tight seal.

Method 4: Installing Storm Windows

Storm windows are like a warm jacket for your existing windows, providing an extra layer of protection against leaks and drafts. Here’s the process:

1. Measure up: Carefully measure the height and width of the window opening.
2. Shop smart: Choose storm windows that match your measurements perfectly.
3. Install with confidence: Follow the manufacturer’s instructions for installing the storm windows over your existing windows. Make sure they’re secured tightly to keep out unwanted air and water.

Method 5: Replacing Window Seals

If your window’s seals are worn out or damaged, they can be a major source of leaks. Replacing them is easier than you might think!

1. Remove the old: Gently pry off the old seal using a putty knife. Be careful not to scratch the window frame.
2. Clean thoroughly: Clean the area where the old seal was to remove any leftover adhesive or debris.
3. Measure and cut: Measure the area for the new seal and cut it to fit snugly.
4. Apply with care: Press the new seal firmly into place, ensuring it adheres securely all around the window pane.

Method 6: Repairing or Replacing Flashing

Properly installed flashing is essential for directing water away from your window. If it’s damaged or not installed correctly, it can lead to leaks. Here’s how to address it:

1. Inspect and assess: Take a close look at the flashing around your window. Check for any signs of damage, gaps, or areas where it doesn’t overlap properly.
2. Remove the damaged flashing (if necessary): If you find damaged flashing, carefully remove it using a pry bar.
3. Install new flashing: Cut new flashing to size, ensuring proper overlap, and install it around the window. The goal is to create a slope that directs water away from the window frame.
4. Seal the deal: Apply a generous bead of caulk or sealant around the edges of the flashing to ensure a watertight barrier.

Method 7: Using Expanding Foam

Expanding foam is a handy solution for filling those larger gaps and cracks around your window.

1. Clear the area: Remove any debris or old caulk from the area you’ll be filling.
2. Apply with caution: Carefully spray the expanding foam into the gaps and cracks. Remember, a little goes a long way, as the foam expands as it dries.
3. Trim and tidy: Once the foam is completely dry, trim any excess with a utility knife and smooth it out for a clean finish.

Average Costs for Repairing Leaky Windows

Our team knows that the cost of repairing leaking windows is at the forefront of your mind. Here’s a quick overview to give you an idea:

Repairing leaky windows can involve fixing cracked glass, replacing worn-out seals, or even repairing damaged frames.

While some may consider DIY repairs to save money, minor errors could result in additional water damage or the need for window replacement, which can be more expensive than hiring a professional from the outset.

Let the Experts at Apex Window Werks Handle Your Leaky Windows!

If you’re dealing with issues like a leaky window, it’s a wise move to get in touch with a trusted window repair and replacement company such as Apex Window Werks. With over 15 years in business, we proudly serve Illinois, Wisconsin, and Minnesota. With nearly 15,000 projects completed, see how we’ve earned a glowing reputation in the community.

Our team of experts offers professional services to ensure your windows are in top-notch condition, including the correct installation of replacement windows, effectively resolving any problems you may face. Don’t hesitate to reach out to us and improve the comfort and energy efficiency of your home today.

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