Tanking wetroom blockwork before plasterboarding?

[ashthekid]

I’ve got a new wetroom in my project that is currently 3 side if blockwork and then one side of structural stud work(which is the external wall with party wall brickwork behind the cavity we’ve created).

Before I get the blockwork dot and dabbed with 12.5mm moisture plasterboards I wondered if it’s worth me putting a layer of some sort of tanking or dampness protection on the blockwork to give me that extra layer of damp protection going through to the rooms on the other side of the blockwork?

I saw some tanking options in Wickes today and wasn’t sure if it was overkill or actually a really sensible idea. 
will the dot and dab still stuck to the blockwork once it’s been treated. 

[James94]

Wouldn’t bother, just tank once plasterboarded. If it done properly you won’t have any issues and if it’s not done properly and water gets to block work your going to need to re do the whole thing again,so very important you waterproof properly.

Regards. James