what type of backing board is best

[Waluigi]

Drill the hole, push the plug in, knock the plug home with a screw, then screw the screw in.

 

[Waluigi]

This was done on a skimmed wall. Quite a few fixings.

The washers were recessed, filled with adhesive and the wall was then tanked.

 

[paul westcott]

Brilliant..thanks for your time

 

[paul westcott]

just a few more questions..when tanking it would you put the mesh tape over the fixings and brush the waterproofing coating on them? also what tanking product would you recommend i was leaning towards the Ardex wpc.
When tiling over plasterboard which is not tanked what would you use for the joints, similar to the backerboard tape the joint and feather over with tile adhesive
Many thanks