Tiles cracked base of walk in shower?

[Octopus8]

The owner of the property is my client. Anyone up for checking out the work to perhaps explain what has caused the movement?

 

[Waluigi]

I wonder if that edging piece has been fitted directly to the floor without a gap. The tray has moved down slightly but the corner piece hasn’t.

Wherever there’s a tile abutment, there should be a gap and a movement (Silicon) joint.

 

[Flintstone]

What is your area of expertise?

 

[acaciaguy]

What is your relationship with the client. I’m confused.

 

[Tile Shop]

To me, looking at the exposed joists, there is no evidence of any support having ever been present between? How was the tray fixed? Just screwed to the joists or another method?

Most trays require an 18mm board fixed to the joists with wooden brackets, levelled to the top of the joist to give a flat surface. Heres an example of the Marmox instructions but most manufacturers advise the same thing:
http://www.marmox.co.uk/uploads/catalogue_gallery/31/instructions/loweredtojoistlevel.pdf

If it is the case of no support, firstly I'm surprised the customer hasn't gone through it at its thinest point, but also any flex would cause a see-saw effect on the very edge leading to..... well, cracked tiles and tile joints.

If I'm wrong then I'm bu99ered if I know other than other significant movement from a different cause.

 

[One Day]

99% certain it's settlement movement. The lower vertical tiles have pulled away from the top horizontal tiles.