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……how does the burj khalifa only have 163 floors

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that would imply an average ceiling height of 5 meters which is just insane

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@Stoori floor 122 is apparently at 422m, which is a more reasonable 3.5m. also not ceiling height but distance between floors

iirc skyscrapers also have dedicated service floors which i assume aren’t counted

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@charlotte @Stoori the regular non-fancy (except for "high" ceilings) but decent quality new construction building we lived at in Russia had distance between floors at 360cm; after concrete slab and cement screed, the actual distance from the raw floor to the raw ceiling was 320cm on average; after floor leveling and floor covering and suspended drywall ceilings (easiest way to get level ceilings and lighting) we ended up with 310-315cm iirc; and ~270cm under load-bearing beams. It was okay.

240-255cm between finished floor and finished ceilings in most low-end construction in the last ~70 years sucks, afaik it was originally calculated to be the minimum reasonable floor height at which people are still not completely uncomfortable. Makes sense that at Burj khalifa they have more reasonable ceiling height, not one that was introduced as cost-cutting measure in social housing in mid-20th century.

Also I don't know anything about service floors, but I can imagine that reasonable modern high-rise buildings with complex infrastructure have additional stuff that eats up the space between floors. For example, pipes for centralized ventilation, or for centralized air conditioning/heating.

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@IngaLovinde @Stoori the wikipedia lists 9 service floors which apparently are part of the 163 figure

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@charlotte @Stoori yeah I'm just trying to say that 3.5m per floor (even a bit less from your numbers) is not just "more reasonable" but, like, the minimum value I'd expect from a complex high-rise building which is not cost-cutting to a degree public housing project would.
I doubt 3.5m per floor in a complex high-rise building would leave more than 3m celling height, which is a ceiling height in Berlin public housing projects constructed in 1920s/1930s; and way less than a typical commercial space (store etc) would have.

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@charlotte okay from Wikipedia it's as @Stoori said:

This 244-metre (801 ft) spire is widely considered vanity height, since very little of its space is usable. Without the spire, Burj Khalifa would be 585 metres (1,919 ft) tall.

585/165 (including concourse and ground floor) = 354cm, which is I'd say on the lower end of reasonable.

Also

the wikipedia lists 9 service floors which apparently are part of the 163 figure

That's top 9 floors. There are also 13 service floors in the lower 154 (17-18, 40-42, 73-75, 109-110, 136-138).

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