Washing The Windows On The World's Tallest Building
On levels 40, 73, and 109 of the Burj Khalifa, a huge bucket machine washes the surrounding windows by moving along a track and travelling vertically with cables. But the top 111 meters of the world's tallest structure have to be cleaned by human window-washers. The men are supported by rope systems, and must dangle in the midst of high winds to scrub the surface of the building.
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Key Facts In This Video
The team that cleans the Burj Khalifa's topmost windows rappels with ropes and uses buckets with squeegees. (0:00)
When wind hits very tall buildings, it can form small whirlwinds that create low-pressure areas. (2:15)
It takes around 3 months to clean all of the Burj Khalifa's 24,000 windows. (3:25)