Is this an ok solution to a leaking shower tray? The tray has an upstand lip but the tiler elected to start full tiles above this lip and used a cut tile beneath it to bridge the gap. The result is the grouting between this short tile and the full size on above it is prone to failure and water leaks behind it and behind the upstand. I just wondered if mastic would be a better alternative to more grout

On 28/10/2020 13:57, fred wrote:
Is this an ok solution to a leaking shower tray? The tray has an upstand lip but the tiler elected to start full tiles above this lip and used a cut tile beneath it to bridge the gap. The result is the grouting between this short tile and the full size on above it is prone to failure and water leaks behind it and behind the upstand. I just wondered if mastic would be a better alternative to more grout

My method is to remove the tiles above the lip, seal with silicone, and
then tile over that so the grout is simply decorative.

--
How fortunate for governments that the people they administer don't think.

Adolf Hitler

fred wrote in
:

Is this an ok solution to a leaking shower tray? The tray has an
upstand lip but the tiler elected to start full tiles above this lip
and used a cut tile beneath it to bridge the gap. The result is the
grouting between this short tile and the full size on above it is
prone to failure and water leaks behind it and behind the upstand. I
just wondered if mastic would be a better alternative to more grout

Sealant rather than mastic works well but it needs to be sanitary silicone
as it has additives which discourages mould growth. I have tried the
proprietary more sticky sealants to overcome the creeping gap problem but
they became discoloured in the longer term.

On 28/10/2020 13:57, fred wrote:
Is this an ok solution to a leaking shower tray? The tray has an upstand lip but the tiler elected to start full tiles above this lip and used a cut tile beneath it to bridge the gap. The result is the grouting between this short tile and the full size on above it is prone to failure and water leaks behind it and behind the upstand. I just wondered if mastic would be a better alternative to more grout

It's normal to use cut tiles around edges because then they can be cut
to accommodate edges that aren't level or straight. You could put
another tile over the top, starting part-way down the previous one.