How to Realign Sagging Aluminium Windows & Fix Gaps
Published by: ALUTimes | Date: July 10, 2025
Introduction
If your aluminium windows are difficult to close, show uneven gaps, or let in drafts, you may be dealing with sagging or misalignment. Over time, even the best aluminium frames can shift slightly due to wear and environmental factors. This guide explains how to realign sagging aluminium windows and fix air gaps to restore both performance and insulation.
Why Aluminium Windows Sag
- Loose or worn hinges: Continuous use can loosen screws or wear out the hinge material.
- Improper installation: If the frame isn’t square or plumb, gravity will gradually shift the sash downward.
- Building movement: Settling foundations can subtly distort window geometry over time.
- Heavy glass weight: Large glass panes in aluminium frames exert pressure on hinges and hardware.
Step-by-Step: How to Realign Aluminium Window Hinges
- Inspect the Hinges: Look for sagging, loose screws, and any damaged or corroded hinge components.
- Tighten or Replace Screws: Use a screwdriver to retighten loose screws or replace stripped ones.
- Adjust the Hinge Position: If the window sags inward or outward, slightly adjust hinge placement to realign the sash.
- On friction stay hinges, you may need to loosen the mounting screws, reposition, and re-tighten.
- Lubricate Moving Parts: Use silicone-based lubricant to smooth hinge movement and reduce wear.
- Check Alignment: Close the window to ensure it sits evenly in the frame without resistance or gaps.
Adjusting Locking Hardware & Handles
Misaligned hardware can prevent a proper seal even after hinge adjustment. Here’s what to do:
- Check Lock Engagement: Make sure the lock connects firmly with the keep plate on the frame.
- Reposition the Keep Plate: Use a screwdriver to move the plate slightly until it aligns with the lock bolt.
- Handle Realignment: Some handles allow minor adjustments to improve operation. Refer to manufacturer guides.
How to Fix Gaps and Improve Weatherproofing
- Identify the Gap Areas: Use a flashlight at night or a strip of paper to find where air or water is entering.
- Replace or Upgrade Seals: Damaged weatherstrips should be replaced with silicone or EPDM gaskets.
- Add Draft Excluders: These can be fitted around the sash to stop airflow in older frames.
- Seal the Frame Perimeter: Apply silicone caulk between the wall and window frame to stop outside leaks.
- Install Window Insulation Film: In colder climates, this adds a thermal barrier to prevent condensation.
When to Call a Professional
If your aluminium windows remain misaligned despite DIY adjustments—or if you notice signs of water damage or warping—it’s best to contact a glazing professional. Persistent alignment issues may indicate structural problems or need custom repairs beyond typical hardware fixes.
Conclusion
Realigning sagging aluminium windows and sealing gaps is a manageable task with the right tools and knowledge. By inspecting hinges, adjusting hardware, and reinforcing weather seals, homeowners can extend window lifespan, improve insulation, and maintain aesthetic appeal.
Disclaimer
This article is intended for general guidance only. Always consult qualified professionals when working with structural or glazing systems. ALUTimes does not accept liability for any DIY damage or misalignment resulting from improper adjustments.