(I) It is required to conceal irregularities in the background.
(II) To provide a finish that is smooth
(III) To make the surface of the wall crack free
(IV) It makes the surface hygienic
(V) It protects the surface from damage.
(VI) It provides a surface that can easily be decorated.
(VII) It may also be required to provide additional thermal and sound insulation, to modify sound absorption or mitigate the effect of condensation.