Fixings for double plasterboard stud walls

[Mazza78]

Hi.Im a new apprentice electrician and was after some advice on fixings please!? I today's had to fit an emergency exit sign in stud wall but it had double layered plasterboard. I thought plasterboard fixings(pig tails) would work but they never gripped and kept spinning out! Am I using wrong fixing or doing something wrong!?
Thanks

 

[sparkdog]

I always use Uno plugs wherever I need rawlplugs,they grip really well.

 

[Andy78]

I gave up using supplied screws with cavity fixings years ago. They are usually longer than needed and need to break off the end off the anchor to get right through, this is where they can spin. PZ2 driver as a starter hole and 1" twinthread woodscrew does the job every time. I save the panhead screws for small SWA cleats.

I have found Thorsman to be my favourite cavity screw anchor.