New bathroom tiling issue

[gambit]

Hi all, this might have been asked many times before, so apologies.
Just moved into a new housebuild and the bathroom tiling is not good!
What would you say ix the largest gap to fill with silicone? It's obvious that the tiler has cust his tiles to short and it trying to hide this with silicone. No water proof backing and straight on to plaster board. So the water will find its way, particularly as its a shower also.

 

[ShaunCorbs]

3-5mm max

 

[gambit]

I thought so, a load of silicone approx 15 mill thick has been pumped in to cover the gap between the bath and tile. Is there a difference between mastic and silicone?
Shouldn't all wet area's have some sort of waterproof tile board?

 

[ShaunCorbs]

Nope defo too much 15mm

Should at least be tanked but it’s new build your lucky if the plasters / paints dry before they tile / paint