Do I need to tank tile backer boards

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Is there any need to tank a shower area when using tile backer boards? I.e. priming, using waterproof tape and membrane?
 
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The foam boards themselves shouldn't let water through, but the joints will.
It's £60 ISH, for piece of mind and might save you having to rip it all out. Belt n braces.

Pay attention to the detailing around the tray itself, lots of posts on here from people with leaking trays.
 

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