15mm gap between end of bath and wall - Tile Advice

[DaveM]

The bath is about 15mm less than the space from wall to wall that it sits in. I was going to just put a upvc bullnose trim or a bit of quadrant on the top and that would fix most of it, but how do you address the vertical gap at the end of the bath panel, especially and the panel has a slight curve to it?

It's not at the taps/shower end, by the way!

Any help, much appreciated, thanks

 

[Time's Ran Out]

Board it out with 12mm plasterboard or Wedi etc.

 

[DaveM]

Thanks. It's already boarded, tiled and grouted. I put an extra board on that end to pack it out, I thought 15mm might be easier than 40mm to fill?

 

[Ajax123]

maybe a piece of cloaking bead.