We have a 1977 house which had its v. large bathroom 'refitted' at some
time before we bought the house 5 years ago. It was obviously done by a
professional, maybe even a bathroom fitting specialist given the
co-ordination of decoration with tiles and fittings etc..
There was a 1200 x 760 shower fitted into one corner of the room,
1200 side on a partition wall, 760 on a brick wall. Floor is chipboard,
the shower was fitted on a chipboard platform raised about 4 inches above
the floor - to allow for the trap and to ensure fall on the waste I guess.
Tiles lifting on the partition wall and a crack in the resin shower tray led
to a decision to renew bathroom. On stripping the tiles, I discovered
the shower tray had been 'let into the walls'. That is to say, the
bottom 8 inch of the brick wall had had its render removed and the
bottom 8 inch of the partition wall had had its plasterboard removed
and the tray was thus sited slightly under the walls!
The walls were tiled down to the shower tray and then sealed with silicone..
... which of course had failed and water was getting thru to chipboard
floor and inside the partition wall cavity and behind the tiles, speeding up
their lifting perhaps?
Its not that the walls weren't square enough (I checked), so this can
only have been done intentionally. but why???
Is this a common technique?
Should I replace in a similar manner? My inclination is to
tile floor to ceiling and fit the shower afterwards...That is
what I've done previously.