How to Fix Leaking Window Seals

Fix Leaking Window Seals

How to Fix Leaking Window Seals.

In the video I show you how to fix leaks in aluminum and PVC windows.

Why Do Windows Leak?

Understand why windows leak in the first place. Usually, it comes down to incorrectly installed cut too short or worn-out rubber gaskets (those black rubber strips around your windows).

Over time, these gaskets can shrink, crack, or sometimes they were cut too short during installation. When this happens, water finds its way inside during heavy rain.

What You’ll Need

  • New rubber gaskets (measure your current ones first)
  • Silicone sealant for windows
  • Clean rags
  • Utility knife
  • Screwdriver
  • Cleaning alcohol

Step-by-Step Guide to Fixing the Leak

1. Find the Leak

Start by checking where exactly water is coming in. You might need to wait for a rainy day, or have someone spray water on the outside while you look from inside. Pay special attention to corners and edges.

2. Clean the Area

Before fixing anything, clean the window frame thoroughly. Remove any old sealant, dirt, or debris. Use cleaning alcohol to make sure the surface is completely clean and dry.

3. Check the Gaskets

Look at your window’s rubber gaskets closely. Are they cracked? Missing pieces? Too short? If they’re damaged, you’ll need to replace them. Sometimes they’ve just popped out of their track and need to be pushed back in.

4. Replace Bad Gaskets

If you need to replace the gaskets:

  • Remove the old gasket carefully
  • Cut the new gasket to the exact length needed
  • Press it firmly into the track
  • Make sure corners are properly fitted

5. Apply New Sealant

For extra protection against leaks:

  • Apply a thin bead of silicone sealant along any gaps
  • Pay special attention to corners and joints
  • Smooth the sealant with your finger (wear gloves!)
  • Let it dry completely (24 hours)

Preventing Future Leaks

Once you’ve fixed the current leak, here are some tips to prevent future problems:

  • Clean your window tracks regularly
  • Check seals and gaskets once a year before autumn
  • Clear any drainage holes in the window frame
  • Trim any overhanging trees that might damage your windows

When to Call a Professional

While many window seal leaks can be fixed with DIY, you might need professional help.
Call a professional if:

  • You can’t locate the source of the leak
  • The window frame itself is damaged
  • The window is warped or won’t close properly
  • You notice rot or mold around the window

Remember, catching and fixing leaks early saves you money and prevents bigger problems down the road. Regular maintenance of your windows, especially before rainy seasons, is your best defense against leaks.


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