Hia all.
A new wash basin and pedestal I'm about to fit doesn't
stand vertical. The cause is the pedestal. So that when the basin is
correctly sitting on top of the
pedestal the back 'plate' is sloping away from the wall from bottom edge to
top.

The pedestal requires a 10/11mm wedge under its front edge at floor level
to bring the back plate flush to the wall.

Is there a suitable cement to work into the gap with the pedestal in situ?
The bathroom floor is kronospan chipboard.

Or any other method?

Thanls.

Arthur.