Dimension of screws for ceiling drywall?

[perrand]

Hello,

A simple(?) question from a novice; which screw should I use to attach 13mm ceiling plasterboard to a 28x70 batten? How close should I screw them? I am attaching 600x1200 sheets to battens spaced at 30cm centers.

Best regards,
Per

 

[Johan Gunverth]

Same as for the walls. Around 30mm long. c/c 150mm.
Yes, c/c 300mm is good for the ceiling.