In article ,
tarquinlinbin writes:
Is it ok to tile directly onto new plasterboard?

If the tiles are going to get routinely wet, as in a shower,
then you might want to worry about water coming through the
grout which may warp the plasterboard eventually.
There are several things you can do about this...
o Use aquapanel (cement rather than gypsom based board which
won't fall to bits if it gets wet).
o I recall reading on a bag of tile adhesive that there's
some type of waterproof tanking you can apply to the
plasterboard first.
o Use a grout additive such as BAL Admix GT1 to reduce the
grout permeability.
o Use a water penetrating resistant grout, such as a resin
one.

--
Andrew Gabriel