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Detached roofs?

I'm not a homeowner, and this is more of a philosophical / architectural question.

I'm just curious why fully detached roofs platforms aren't a thing. For example, imagine a simple square house with a flat "top" that is fully insulated. Then imagine four tall steel beams that are in concrete bases in the ground that are outside the house and rise to a traditional sloped platform roof that "hovers" above the house.

If it rains, the roof platform would extend over the square structure below enough that it is not a concern, so the house is dry.

If it snows, the roof platform is already cold and so the snow either collects or slides off after enough weight is reached -- it never melts since it is not in contact with any heat.

If it's a hot summer, the roof might get very hot but the square structure is in the shade below, which means you have a very effective "air gap" between the roasting roof and the structure underneath.

You could even mount solar panels in the roof with elaborate wiring and it would be dead simple to service.

Also, since there is no air being exchanged with the outside via a traditional roof vent system, your heating and cooling costs are less.

There must be some reasons why this isn't done, and I'm just curious if you guys would know what these are.

submitted by /u/univinu
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