On 15/02/2018 09:35, GB wrote:
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?

It would be ok on a solid wall - not so easy to do in the thickness of
some aquapanel... You could do it will a wall chaser - position both
disks side by side to get a wider kerf, set the require depth of cut,
and then make several passes to chop away the required thickness.

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.

Alternatively you add packers behind the aquapanel to bring it to the
right position (i.e. inner face just inside of the upstand) and only
bring it down to the tray to finish on top of the upstand.

(you could then add some additional offcuts of aquapanel to bridge the
interface on the outside and silicone that on to add an extra layer that
bonds the main aquapanel to the outside of the tray.



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

The instructions show the upstand thickness at 10mm... If so that is not
far off the thickness of the aquapanel.


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

Probably one of the reasons!


--
Cheers,

John.

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