screwing plasterboard to plasterboard

[Wonderhorse]

Prior to us moving in, our Lounge wall was apparently very wet so they had it tanked, then platerboarded (I'm assuming dot and dabbed).

I now want to fix plasterboard to the old plasterboard (long story), I would like to screw it, does this mean I will need to use plasterboard fixings?

Thank you in advance.

 

[cjard]

Use adhesive, if you're certain the substrate is sound

Alternatively, rip the old stuff off and fix the new stuff properly..

Ps, sounds like the wrong thing to do with the tanking unless the wall is of solid construction and there's a valid reason why it would be wet on the inside(such as the house being inset into the earth with no scope of digging it away from the wall and filling the void with Teram/stone chips