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.
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)