How to Keep Your Tubular Skylight Clean and Efficient
How to Keep Your Tubular Skylight Clean and Efficient
Tubular skylights (also known as sun tubes or TDDs) are a clever, cost-effective way to brighten dim areas of your home. But just like any daylighting system, a little maintenance goes a long way to ensure they deliver maximum light and keep your energy bills low.
Here’s a simple guide to keep your tubular skylight in top condition all year round.
Why Clean and Maintain It?
Over time, dust, pollen, insects, and debris can build up inside the dome, tube, or diffuser. This reduces how much daylight makes it into your room — defeating the purpose of installing one in the first place.
Regular care helps:
- Keep light levels high and consistent.
- Prevent mould or mildew in damp areas.
- Extend the life of your skylight system.
1️⃣ Clean the Exterior Dome
The dome on your roof catches the sunlight — so it needs to stay clear.
How to do it safely:
- Use a garden hose or soft cloth to wash off dirt, bird droppings, or leaves.
- Avoid using abrasive cleaners that could scratch the surface.
- If your roof is steep or slippery, always hire a professional — never risk your safety.
2️⃣ Dust the Interior Diffuser
Inside, the ceiling diffuser spreads light evenly into the room. Over time, dust and insects may collect inside.
How to clean:
- Gently remove the diffuser according to your skylight’s manual (usually it twists or unclips).
- Wipe it with a damp, soft cloth and mild soap if needed.
- Dry completely and reinstall.
3️⃣ Check the Tube for Obstructions
It’s rare, but sometimes insects or debris get into the tube itself.
What to do:
- If you notice dark spots or shadows that weren’t there before, have a professional check inside the tube.
- Do not attempt to dismantle the tube yourself — the highly reflective lining is delicate and can be damaged easily.
4️⃣ Inspect the Seals and Flashing
While cleaning, take a quick look at the seals around the dome and the flashing on the roof.
- Look for cracks, lifted edges, or signs of leaks.
- Reseal small gaps with appropriate roofing sealant, or get a pro to fix larger issues.
Illustrative Example Only:
A homeowner in Nelson noticed their hallway sun tube looked dull. Cleaning a dusty diffuser and washing the dome restored bright, even light within minutes.
How Often Should You Clean It?
- Exterior Dome: Once or twice a year — more if you live in a windy, coastal, or high-pollen area.
- Interior Diffuser: Every few months or when you see visible dust.
Final Thoughts
Tubular skylights are delightfully low-maintenance — a quick clean and seasonal check keep them performing like new. Bright, free daylight is one of the simplest ways to make your home feel fresh and welcoming every day.
Need Help with Your Sun Tube?
Our team is ready to help with cleaning, checks, or upgrades.
