Old plaster came away, render looks solid and flat what do i need to seal it with prior to tiling?

[Time's Ran Out]

At £50 for a tanking kit it would be cheaper to fix Wedi board .

 

[Dumbo]

At £50 for a tanking kit it would be cheaper to fix Wedi board .

But is it cheaper once you tape the joints and waterproof screws ?But I'm with you in that i would fix tile backer board if I was at that point .

 

[Qwerty]

At £50 for a tanking kit it would be cheaper to fix Wedi board .

Add p&p into the equation if nowhere local, DIYer paying retail prices and it may well not be cheaper

 

[Perry]

You don't need aquaboard.

 

[Flintstone]

Tilefix direct for all the boards and fixings, price it up. Better than a tanking kit.

 

[Qwerty]

IMO dry lining the whole room with plasterboard and tanking only the shower area is more cost effective than tanking boards and tanking tape/ paste for the joints.

Don't get me wrong, tanking boards are superior all day long, but when cost is a consideration then dry lining the whole room is cheaper.