BigWallop wrote:

If you do want to bury the pipe, then make sure it is lagged and is inside a
boxed chase. This stops any condensation which forms on the surface of the
pipe from damaging or causing damp marks on any plaster work that is around
it.

Interesting reasoning. How exactly do you expect condensation to
form on a pipe that is burried in plaster?

In order for condenstation to form, the pipe has to be in
contact with air carrying some water vapour. Being in contact
with plaster which is at equilibrium with the air *will not*
result in condensation on the pipe's surface.

--
Grunff