Why do people prefer to give a layer sand or foam insulation on ceilin

1.	Why do people prefer to give a layer sand or foam insulation on ceiling made up of concrete ?
Answer» Solution :The thermal CONDUCTIVITY of concrete though MUCH smaller than that of metal is still not SMALL enough. Therefore, people usually prefer to give a LAYER of sand or foam insulation on the ceiling so that heat transfer is prohibited and keeps the room cooler.

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