Atrium skylights and curtain wall glass need different tools. Curtain wall is near-vertical and favours a facade robot or rope crew; an atrium skylight is a sloped glass roof best handled by a vacuum-adhesion skylight cleaning robot working from the roof edge, not from below.
People lump these together because they are all “glass.” The access problem is completely different. A curtain wall hangs above a street or plaza, so anything dropped becomes a hazard to the public. An atrium skylight sits over occupied space, often over a food court or lobby, so water control becomes the hard part.
Why is water control the real problem over an atrium?
Wet cleaning a skylight above a busy atrium means every drip lands on people, escalators or a marble floor. Two approaches work. First, run the robot with a controlled water feed and a squeegee blade that lifts almost all the water, then follow with a dry pass. Second, schedule the clean out of hours and hang a temporary containment beneath the ridge line.
Robot water tanks typically hold 10 to 20 litres. At a wet rate of about 0.05 to 0.08 litres per square metre, a 20 litre tank covers 250 to 400 m2 before a refill. On a 600 m2 atrium roof that means at least one refill mid-job, and the refill point needs to be on a safe walkway, not balanced on the glass edge.
How do you sequence a mixed glass building?
- Start on the highest sloped skylight while the water is cleanest and the operator is freshest.
- Work in a pattern that always leaves a dry escape path behind the robot, never ahead of it.
- Finish with edges and mullion lines on foot or with a pole, since robot brushes miss the last 100-150 mm.
- Log water usage and time per zone so the next visit can be scheduled tighter.
What setup fits a glass roof over occupied space?
For a sloped atrium skylight, a vacuum-adhesion unit with a lower weight wins. The Lingyun Y3 at around 14-16 kg body weight keeps point load manageable on standard purlins while holding a 30-degree slope. For a smaller feature skylight or a tight ridge detail, the Lingfeng S1 manoeuvres better. For flat glazing over a shopping centre, the tracked Lingkong K3 is often enough and cheaper to run.
Who should not go robot here: any atrium where the skylight sits above sensitive finishes like open wiring, museum pieces or a working kitchen line, unless you can fully contain water. In those buildings, dry or minimum-water cleaning with a soft brush is the only sane option, and you should accept a slightly hazier finish.
How often should atrium glass be cleaned?
Interior-visible atrium glass shows dirt faster than exterior glass, because daylight comes through it and highlights streaks. Most owners settle on four to six cleans a year: a deep clean at the start and end of summer, plus lighter maintenance passes. Exterior curtain wall on the same building often needs only two to three. Budget the atrium heavier, not the facade.
How do you handle a skylight over a working kitchen or pool?
These are the hardest atriums. A pool hall is permanently humid, so glass fogs and water control is a constant battle. A kitchen line produces grease that settles on the underside of the glazing, and grease needs a stronger detergent than plain glass cleaner, which then risks dripping into food preparation space.
The workable approach is a closed cleaning window with containment below, a degreasing step on the underside by hand where reachable, and a minimum-water robot pass on top. If the kitchen runs 24 hours, schedule the clean for the maintenance shutdown and accept a longer gap between deep cleans on the top surface. Trying to clean above a live kitchen line with water is how incidents start.
What does a realistic atrium cleaning schedule look like?
For a mid-size atrium, six cleans a year works for most owners: two deep cleans in spring and autumn, and four lighter maintenance passes. The deep cleans reset the glass and handle water spots and traffic film; the maintenance passes keep it presentable between them. Exterior curtain wall on the same building often needs only two to three cleans, so the atrium is the heavier line item and the one to plan most carefully.
Build the schedule around the building’s own rhythm. Avoid busy trading weekends, avoid the week before a major event, and avoid the rainy season when water control is hardest. A well-timed clean lasts longer and looks better than one squeezed in at a convenient date for the contractor.
What does a full atrium clean cost per year?
Take a 1,000 m2 atrium cleaned six times: 6,000 m2 of work a year. On a rope or gondola at USD 4.00 per square metre that is USD 24,000. A robot doing the same work at a planning rate of 180 m2/h needs about 33 hours over those six cleans, plus setup and refills, so operator time and running costs land far lower. On high-frequency atriums the gap is wide, which is why they adopt robots first.
Curtain wall on the same building, cleaned twice at 900 m2, is a smaller line item but a harder one, because access over a street plaza costs more and closes more risk. Keep the two budgets separate and you will quote and plan them honestly.
Key Takeaways
- Skylights and curtain wall are different jobs with different access and tools.
- Over occupied space, water control beats cleaning power.
- A 20 L tank covers roughly 250 – 400 m2 before refill.
- Lighter vacuum-adhesion units suit sloped atrium glass; tracked units suit flat glazing.
- Atrium glass needs more frequent cleaning than exterior facade glass, not less.
Planning a mixed glass building schedule? Send the layout through the contact page and we will map zones to the right machine.