Soundbloc plasterboard

[Draughtsman]

I'd like to use a soundproof plasterboard on this ceiling, what thickness do I need? It's just going to be a ground floor bedroom.

What additional measures are necessary to make the use of a soundproof plasterboard effective?

 

[wwwebber]

Soundproof plasterboard is only part of the solution if you need to reduce noise transmission between rooms. Its not actually "soundproof" but "sound reducing" and alone it is not very effective. I would put rockwool RW3 between the floor joists as a minimum and maybe consider double boarding with the sound reducing board. There's much more you can do but it gets quite expensive.