zyx Rationalist (India)
Cool Top Floors
People in sunny countries living on top floors with sun blazing their roof experience harshness of summer all their lives. If the top floor roof is made of two slabs i.e. one cheaper and another stronger (for terrace) on top of it with no walls between them for air circulation, then those people will live a cooler life. This idea can be used by builders for selling their top floors at proper rates.

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