Yet Another Suspected Wet Room Floor! Looking For Advice Please!

[One Day]

And the grout likely went soft because bacteria will break down cement if it stays wet and stagnant. And never Silicon around a drain. It only helps trap the water...

 

[SJPurdy]

And the grout likely went soft because bacteria will break down cement if it stays wet and stagnant.

The example quoted earlier the grout was soft after two weeks!

I think there are going to be a lot more problems with these trays in general. I think most of the ones I have fitted over the years have not had much consideration built in to allow the adhesive bed to drain into the drain, conversely I suspect most had a plastic barrier solvent welded (plumbers job) into the drain which was then tiled up to. Many of the ones I fitted then also had the joint between tile and this plastic lip filled with flexible sealant (in accordance with BS) as grout would crack and let water through (into the cement bed not the drain).

 

[One Day]

Yeah, 2 weeks something else was up. Definitely agree on the design flaws. I've seen far too many xps core trays turn to mush this past couple of years!