Backer board joints

[bennettp23]

Hi,

The backer boards are now installed for my shower.

For the joints, do I just use tape or do I need some sort of waterproofing over the tape please? Is silicone in the joints a no no?

Also, the Grohe concealed shower has some waterproof templates to go over the controls. What do I stick that down with?

Thanks!

 

[dilalio]

You can get a tanking tape that goes over the board joints. What boards have you used? They sell a tape in wickes. But I don't usually bother. I use hardiebacker and it doesn't move and the tiles are the waterproof layer.
What does the grohe MI's say you should attach their seals with? I'd have thought silicone.

 

[Madrab]

Usually you would just use a scrim, have the boards been offset fitted? Silicone down the corners and along the bottom