8 Common Aluminium Window Problems (And How to Avoid Them)

Aluminium windows are known for their strength, durability, and modern appearance—but like any building component, they can develop problems if poorly specified, incorrectly installed, or inadequately maintained. The good news is that most aluminium window issues are preventable when you know what to look out for.

Below are 8 common aluminium window problems experienced in South African homes, along with practical ways to avoid them.

1. Water Leaks Around the Window Frame

One of the most common complaints is water leaking during heavy rain.

Why it happens:

• Poor installation or sealing 
• Incorrect sill detailing 
• Blocked or missing drainage holes 

How to avoid it:

• Ensure proper flashing and sealing during installation 
• Choose windows with built-in drainage channels 
• Keep drainage holes clean and unobstructed 

2. Drafts and Air Leaks

Windows that allow air to pass through can make rooms uncomfortable and increase energy costs.

Why it happens:

• Worn or poor-quality rubber seals 
• Incorrectly aligned frames 
• Low-quality aluminium profiles 

How to avoid it:

• Use quality window systems with compression seals 
• Ensure professional installation and alignment 
• Replace worn seals promptly 

3. Windows That Are Hard to Open or Close

Stiff or jammed windows are frustrating and often worsen over time.

Why it happens:

• Misalignment during installation 
• Dirt buildup in tracks 
• Inferior rollers or hardware 

How to avoid it:

• Use high-quality rollers and fittings 
• Ensure frames are square and level 
• Clean tracks regularly 

4. Corrosion in Coastal Areas

Although aluminium doesn’t rust like steel, it can still corrode if incorrectly finished.

Why it happens:

• Non-marine-grade powder coating 
• Poor maintenance in salty environments 

How to avoid it:

• Specify marine-grade powder coating or anodised finishes 
• Rinse frames regularly in coastal areas 
• Avoid harsh chemical cleaners 

5. Excessive Heat Gain

Some homeowners feel aluminium windows make their homes too hot.

Why it happens:

• Incorrect glass specification 
• Lack of shading or orientation planning 

How to avoid it:

• Use tinted, Low-E, or double glazing 
• Consider window orientation during design 
• Add shading elements such as overhangs or screens 

6. Condensation on Glass or Frames

Condensation is often mistaken for a window defect.

Why it happens:

• High indoor humidity 
• Poor ventilation 
• Temperature differences between inside and outside 

How to avoid it:

• Improve ventilation (extractor fans, louvre windows) 
• Use double glazing where possible 
• Manage indoor moisture levels 

7. Rattling or Noisy Windows

Rattling windows are not only annoying but can indicate deeper issues.

Why it happens:

• Loose fittings or glazing beads 
• Poor-quality profiles 
• Improper installation 

How to avoid it:

• Choose reputable manufacturers 
• Ensure proper glazing methods are used 
• Address loose components early 

8. Fading or Peeling Finishes

Discoloured or peeling frames affect both appearance and durability.

Why it happens:

• Low-quality powder coating 
• Lack of UV resistance 
• Exposure to harsh environments 

How to avoid it:

• Use certified powder-coated or anodised finishes 
• Avoid abrasive cleaning products 
• Confirm finish warranties before purchase 

Why Most Aluminium Window Problems Are Preventable

The majority of aluminium window issues arise from:

• Poor product selection 
• Incorrect installation 
• Lack of basic maintenance 

By choosing a reputable aluminium window manufacturer and installer, most of these problems can be avoided entirely.

Final Thoughts

Aluminium windows are a long-lasting, high-performance solution—but only when properly specified, installed, and maintained. Understanding these common problems empowers homeowners to make better decisions and protect their investment.

If you’re planning new aluminium windows or experiencing issues with existing ones, professional advice early on can save significant time and cost later.