The Index

The Index is a 328 m (1,076 ft) tall, 80-storey skyscraper in Dubai, United Arab Emirates. Of the 80 floors, the lower 25 are to be offices and 47 will be for residential use. The tower is oriented exactly along the east-west axis so that the eastern and western concrete cores shelter the floors from the harsh, desert sun and the climatic effects of the area. The concrete cores shelter the building from the low angle, highly penetrating morning and evening sun leaving only the South facade exposed to the high angle, low penetrating midday sun. The south-facing facade utilizes extensive sun shades to lower solar gain.