Installing shower tray with upstands - this seems to be a right *******
of a job. According to the destructions, you are supposed to install
cement board down to the floor, then chip away 5mm from the face of the
board to a height of 115mm, so as to inset the shower tray and upstand.
I spoke to Mira's technical helpline, who said: "ask your builder, as
he'll have the right tools for the job".

The destructions show this being done with a hammer and bolster. Well, I
have those, and it's not going to work, is it?

I'm using 12mm Aquapanel cement board, btw. The only way I can see to do
this is to add a second 5 or 6mm layer of cement board on top of the
Aquapanel, stopping 115mm short of the floor. Thus neatly doubling the
cost and the work of preparing the room.


http://resources.kohler.com/plumbing...user-guide.pdf


My impression is that most shower trays don't have upstands. Is this why?