What is the use pf plaster of paris can it act like false ceiling to prevent excess heat is it safe?

Once you make a ceiling out of plaster of paris... it IS a cieling... and cannot be a false ceiling. In order to DO that you'd have to build a structure to hold the weight of the plaster. That structure, combined with the plaster itself, and the fact that it is in a plane over people's heads. MAKE it a ceilingWhat is the use pf plaster of paris can it act like false ceiling to prevent excess heat is it safe?
It sounds like you're wanting a drop ceiling which is a far cry from plaster. Plaster is heave and a drop ceiling id light and will breath.