how to replace glass in aluminum window

Daniel Parker

2 min read

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07-02-2025

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Replacing glass in an aluminum window might seem daunting, but with the right tools and careful approach, it's a manageable DIY project. This comprehensive guide will walk you through the process, saving you money and enhancing your home's energy efficiency. This guide focuses on replacing single-pane glass; double- or triple-paned units generally require professional replacement.

Assessing Your Window and Gathering Supplies

Before starting, carefully inspect your window. Determine the type of glass (single-pane is easiest), and measure its dimensions accurately. Order replacement glass slightly smaller than your measurements to allow for expansion and contraction. You'll need a snug fit, not an exact match.

Essential Supplies:

• Replacement glass: Measure accurately! Consider ordering from a glass shop for a precise cut.
• Glazing points (splines): These hold the glass in place; choose ones that match your existing ones.
• Glazing tape: Creates a waterproof seal.
• Putty knife: For carefully removing old glazing points and tape.
• Utility knife: For cutting glazing tape.
• Safety glasses: Always protect your eyes!
• Gloves: Protect your hands from sharp glass fragments.
• Measuring tape: Accurate measurements are crucial.
• Silicone sealant (optional): For added security, though glazing tape generally suffices.

Step-by-Step Guide to Replacing the Glass

1. Preparation is Key:

• Cover your work area to protect it from potential glass fragments.
• Wear your safety glasses and gloves. Safety first!

2. Removing the Old Glass and Glazing:

• Carefully use your putty knife to remove the old glazing points (splines). Work slowly and methodically to avoid breaking the glass unnecessarily.
• Once the glazing points are removed, gently remove the old glass. Dispose of it responsibly.
• Clean the window frame thoroughly, removing any remaining old glazing tape or putty.

3. Installing the New Glass:

• Insert Glazing Points: Carefully insert the new glazing points (splines) into the window frame, creating a channel for the new glass. Ensure they're evenly spaced.
• Insert the New Glass: Gently place the new glass pane into the frame, making sure it sits flush against the glazing points.
• Secure with Glazing Tape: Apply glazing tape around the perimeter of the glass, pressing firmly to ensure a strong seal.

4. Finishing Touches and Inspection:

• Carefully inspect your work to ensure a proper seal. Any gaps could compromise energy efficiency and weatherproofing.
• Optionally, apply a bead of silicone sealant around the perimeter for extra security (especially in harsh weather conditions).
• Clean up any debris.

Troubleshooting Common Issues

• Broken Glass: If the glass breaks during removal, carefully remove the fragments and replace the entire pane.
• Difficult Removal: If the old glazing is stubborn, carefully apply a little heat (a hairdryer on low setting can help soften old putty).
• Uneven Seal: If the seal appears uneven, carefully remove the tape and reapply it, ensuring complete coverage.

Maintaining Your Aluminum Windows

Regular maintenance is key to extending the life of your windows. Clean the windows regularly, and inspect them periodically for any signs of damage or deterioration. Address any problems promptly to prevent further issues.

Conclusion

Replacing glass in an aluminum window is a rewarding DIY project that can save you money and improve your home's energy efficiency. By following these steps and taking necessary precautions, you can successfully complete this project and enjoy the benefits of a newly glazed window. Remember to prioritize safety and take your time; patience is crucial for a successful outcome. If you're uncomfortable with any step, consider consulting a professional glazier.