How to Keep Your Tubular Skylight Clean and Efficient

Tubular skylights are a brilliant way to bring natural light into dark hallways, closets, and bathrooms. But to keep them performing at their best, a little maintenance goes a long way. In this article, we’ll walk you through how to keep your tubular skylight clean and efficient all year round, without needing a toolbox or a tradesperson.

Why Maintenance Matters

Even though tubular skylights are relatively low-maintenance compared to traditional skylights, they’re not completely maintenance-free. Over time, dust, moisture, and roof debris can reduce the clarity of the dome or the reflectivity of the tube. Regular upkeep ensures:

• Maximum light output
• Improved energy efficiency
• Longer product lifespan
• Prevention of moisture or condensation build-up
  

1. Clean the Exterior Dome

The clear dome on your roof is your skylight’s window to the sky. When it’s dirty or covered with leaves and grime, light transmission drops significantly.

Steps:

• Clean on a dry, calm day.
• Use a soft sponge or cloth with mild soapy water.
• Avoid abrasive cleaners or high-pressure washing.
• Rinse with clean water and gently dry.

Tip: If access to the dome is difficult, consider scheduling a roof maintenance check where cleaning can be included.

2. Check for Condensation or Fogging

Tubular skylights are designed to be sealed systems, but older or poorly installed units might occasionally show signs of condensation.

What to Look For:

• Moisture inside the tube
• Fogging on the diffuser or dome
• Water marks or discolouration on the ceiling

Solutions:

• Ensure the seals and flashing are intact
• Add or replace insulation around the tube
• If persistent, consider contacting a specialist like those listed here

3. Wipe the Interior Diffuser

The diffuser disperses sunlight evenly into your space—but it’s also a dust magnet.

To Clean:

• Twist the diffuser to release it (most models turn counter-clockwise)
• Wipe with a dry microfibre cloth or soft damp cloth
• Avoid strong solvents that can cause yellowing or cracking

Safety Note: Never spray cleaner directly onto the diffuser while it’s attached. Moisture could seep inside the tube.

4. Inspect Flashing and Roof Seals

A secure, watertight installation ensures efficiency and avoids water ingress.

What to Check:

• Cracks or gaps in the flashing
• Loose fasteners or sealant deterioration
• Debris or moss buildup

Recommended Action:

• Minor issues may be sealed with silicone roofing sealant
• Major wear or leaks should be inspected by a professional installer

5. Consider an Annual Check-Up

A once-a-year inspection—especially before winter—can save you from costly issues down the line.

Include in your check-up:

• Dome clarity
• Flashing integrity
• Interior cleanliness
• Light output comparison from previous seasons

Final Thoughts

Keeping your tubular skylight clean and efficient isn’t a time-consuming chore. A few simple steps can ensure your home continues to benefit from natural daylight and reduced energy costs year-round.

Explore more practical tips in our blog series or reach out to our team for personalised advice.

Need help with skylight maintenance or considering an upgrade?

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