On 29 Jan, 12:36, "Robert Laws" wrote:
On Jan 29, 12:19 pm, "Flummoxed" wrote:
..

It would be easier to draw a diagram, but basically we are planning to
change out bathroom. What I want to do is replace the old bath,
washbasin and toilet, but not just replace them in situ as we've done
before, but I want to add one of those units that look a bit like a
narrow version of a kitchen base unit and worktop, that the basin fits
into, and the toilet will back onto (with the cistern concealed in the
unit). Hope that makes sense....We are halfway through doing something very similar. We are putting a
'back to wall' loo (but floor standing) again the unit with the flush
inside the unit, plus a recessed basin in the unit to the right. We
plan to build the 'unit' out of 18mm marine ply. We also plan to use
marine ply to move one wall so it comes right up to the bath. the bath
will then be walled on three sides with a fixed shower screen at the
tap end.

We then plan to have the whole lot tiled. At the time of tiling, the
bath will be fixed in but the basin and loo will be 'loose' -
apparently this is what the tiler wants.

one further point: to give access to the pumbing we plan to make the
'worktop' of the unit removabale, complete with the basin. This means
that the basin will have flexible pipes. We think this is better than
having an access hole with loose lid as the whole 'worktop' can be
made to have a more watertight snug fit.

but as to your question: We plan to fix the bath up against the wall
on three sides and then to tile down to it with a sealant bead around
it. two side are block/plaster walls already, with the plaster
coming down only as far as just above the bath. the third wall will
be the marine ply one.

if you'd like to compare notes in more detail please email me on laws
at bcs dot org dot uk,

Thanks for the helpful response Robert - that was quick! I assume you
chose marine ply as the best option for the stud wall based on a
recommendation? I admit I hadn't looked into it. I guess it needs to
be strong and fairly rigid, to take tiling.

As for the bath, we would be planning to do something similar to you,
i.e. have 3 walls round the bath. It sounds as if it's a good idea to
chase the bath end/sides into the wall, so the plaster on the wall
above would stand out above the edge of the bath - have I understood
correctly? In that case it sounds as if it would also be a good idea
to have the marine ply standing out slightly above the end of the bath
too. Then You can tile right down to the bath and seal it as you say.