Advantages and Dis-advantages of Plaster of Paris (for false ceiling)

Advantages of plaster of Paris(POP):

• It expands very slightly on setting.
• It is not likely to cause cracking of surfaces.
• It forms a thick surface to resist normal knocks after drying.
• It is easy to spread and level.
• It mixes up easily with water.
• It has no appreciable chemical action on paint and does not cause alkali attack.
• Tiles and blocks of plaster of Paris have the specific advantage of lightness and high fire resistance.
• Plaster of Paris gives a decorative interior finish.

Disadvantages of plaster of Paris:

• Gypsum plaster is not suitable for exterior finish as it can not be used in damp finish.
• Cement can not be mixed with plaster of Paris.
• It is more expensive than cement or cement lime plaster
• It can not be used in moist situations.
• The labor cost for applying plaster of Paris is high.