I live in India where most of the building roofs are made of concrete. In summer during night, the roof emits too much of heat that were absorbed during day time.
I was aware of the options like having good ventilation, insulation, trees etc. But I want to be very specific with concrete roof top.
The inside roof is painted with white cement.
I am looking for some kind of paint or any other material that can be applied on top (outside) of the roof so that heat is reflected back instead of concrete absorbing it