How to Fix a Window Leak

Are you dealing with a window leak? This can be an annoying problem, but it is fixable. Below are some simple steps you can take to repair the leak and prevent it from happening again.

How to Fix a Window Leak

The good news is, fixing a window leak doesn’t have to be difficult. With some craftsman know-how and just a few supplies, it can be done in no time! This blog post will show you how to fix a window leak using simple DIY tools and materials that are easy to find or use repurposed items from craft projects around the home.

No matter if your windows don’t fit properly or need caulking, we will walk you step by step through everything needed to fix a window leak so you can stay dryer and more comfortable during all seasons of the year!

What Will You Need?

Before you get started, here’s what you’ll need to fix your window leak:

  1. A utility knife
  2. Caulk
  3. Putty knife
  4. Painter’s tape
  5. A clean rag or cloth

Once you have your supplies, you can begin the repair.

10 Easy Steps on How to Fix a Window Leak

Step 1: Use a Utility Knife to Remove the Old Sealant

Remove any existing sealant or caulking around the window frame using a utility knife. Be sure to cut away all of the old material until you have a clean surface for the new sealant. As you remove the old sealant, be sure to use a clean rag or cloth to wipe away any debris that may have been left behind.

 Using a Utility Knife

Step 2: Clean the Area

Once the old caulking has been removed, use a clean rag or cloth to wipe down and dry the area before moving on to caulking. This will prevent dirt or other debris from getting caught in the new sealant and causing issues later. Don’t forget to check the inside of the window frame as well for any bits of old caulk!

Step 3: Apply Caulk

Now that your surface is prepped, it’s time to apply some caulk! Start by running a line of caulk along each side of your window frame, making sure to get into the corners and crevices. Try to make your line of caulk as even and level as possible.

Step 4: Smooth Out Caulk

Once your caulk is in place, use a putty knife to smooth it out and create a nice seal around the frame. This will help keep moisture from getting inside the window and causing issues down the line. You can also use the putty knife to clean up excess caulk and smooth out bumps or air pockets.

Use a Putty Knife to Smooth It Out

Step 5: Remove Painter’s Tape

If you used painter’s tape to hold your windows in place while applying the caulk, now is the time to remove it. Be sure to pull away slowly so you don’t disrupt any of the caulking that you applied earlier. Otherwise, you may have to start over again!

Step 6: Let Dry

Let your caulking dry for at least 24 hours before you open or close your windows again. This will ensure the sealant has had time to adhere and form a lasting bond properly. Try to use light pressure when opening or closing the windows to avoid disrupting the caulk.

Step 7: Reapply Window Film or Tape (Optional)

If you used window film or tape when you applied your caulking, now is the time to reapply it. Doing so will further help protect against water seeping through any gaps that may still be present in the sealant. Additionally, the film or tape will add an extra layer of insulation to help keep your home warm in the winter and cool in the summer.

Step 8: Clean Up Any Excess Caulk

Once everything is dry, use a damp rag to clean up any excess caulk that may have been left behind during application. Another option is to use a putty knife and scrape away any extra material. If you do this, be sure to wipe down the area afterward.

Use a Damp Rag to Clean

Step 9: Check for Leaks

After all of this hard work, don’t forget to check for leaks! Run a hose or bucket of water over the window and see if it’s still leaking. Keep an eye on the area over a few days to ensure everything is sealed properly.

Step 10: Enjoy Your Dry Windows!

If your windows are no longer leaky, then congratulations! You have successfully fixed your window leak. Now you can enjoy dryer and more comfortable surroundings all year round. Remember, if you ever have any questions or concerns along the way, don’t hesitate to call a professional for help.

Following these steps can help ensure that your window seal is secure and that your home remains warm in the winter and cool in the summer. With just a few simple steps, you can easily fix any window leaks and make sure that your home stays safe from moisture damage. So don’t wait – repair those windows today!

5 Additional Tips and Tricks

1. Inspect the window seal to make sure it’s still intact. If the seal is broken, cracked, or missing in parts, you will need to replace it as soon as possible.

2. Check for any gaps around the window frame and use caulk to fill them in. Make sure you choose high-quality outdoor caulking that is formulated for windows and doors, so it won’t crack or peel over time.

3. Look out for rust on your window frames and take care of it immediately – if left untreated, this can cause further damage to your windows and lead to more leaking problems.

4. Don’t forget about weather stripping! This is essential to any window repair job and can help keep out drafts, dust, and moisture. Ensure your weather stripping is in good condition (no cracks or breaks), and replace it if necessary.

5. Finally, consider investing in storm windows to add a layer of extra protection against the 

Use Caulk to Fill Them

elements. Storm windows are an effective way to keep water from seeping into the frame of your existing windows when inclement weather strikes.

With a few simple steps, you can help ensure your windows are properly sealed and free of leaks. Taking the time to inspect and maintain your windows will go a long way in protecting your home from water damage.

5 Things You Should Avoid

1. Avoid using cheap, low-quality materials when repairing your windows. Inferior products can quickly deteriorate and result in more costly repairs down the line.

2. Don’t forget about ventilation! Insufficient air flow can lead to condensation issues that could potentially cause water damage if left unaddressed.

3. When choosing a caulking product for window repairs, avoid silicone caulk, as this type of caulk may not last very long and will need to be replaced often.

4. Don’t forget that regular maintenance is key – check your windows every few months to ensure everything is sealed properly and any weather stripping is still intact.

5. And most importantly, don’t ignore warning signs of a window leak. Don’t wait until the problem becomes too severe – take action immediately to prevent further damage.

By following these tips and tricks, you can help ensure your windows are properly sealed and free of leaks. Taking the time to inspect and maintain your windows will go a long way in protecting your home from water damage.

What Causes a Window to Leak Inside?

1. Poorly sealed windows: If a window is not properly sealed, water can seep through the gaps and cause leaks inside your home.

2. Improper installation: If a window has been incorrectly installed, this can cause leaks as well.

3. Damaged weather stripping: Over time, weather stripping can become worn out or damaged, leading to air and water infiltration if not replaced or repaired regularly.

4. Cracked Windows: A cracked window pane can also be the source of water entering your home – especially during heavy rainfall or severe storms.

5. Condensation buildup: An excessive amount of condensation on windows that aren’t addressed can also lead to leaking issues.

If you think a window leak is the cause of water damage in your home, it’s important to address the issue as soon as possible. This will help ensure the problem doesn’t worsen and prevent costly repairs later. Follow the tips above to get started on fixing a window leak and keep your home dry!


It’s important to remember that window sealant is a quick fix and should be done as soon as possible to reduce the amount of moisture entering your home. If the sealant doesn’t hold, you may need to replace the entire unit or spray foam insulation if your window’s seals are too far gone. Keep in mind that it’s always better to be safe than sorry, and ensure your window leaks are repaired as soon as they’re noticed. Of course, make sure to turn off the water before beginning any repairs!

With a little knowledge and preparation, you’ll be able to minimize your risk of leaks for a while. To take it one step further, why not use all this newfound knowledge and craft an item out of what you have left over? Making something from scratch with what you have on hand is a great way to show creativity and add unique decor pieces around the house.

Hopefully, the article on how to fix a window leak has been helpful. Thanks for reading!

Photo of author

Jennifer Branett

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