Rafters are 9x2so approx 225mm depth
I was planning to insulate with rigid board at 165mm leaving a 60mm air gap and then plaster boarding.
Is rigid board such as celotex good at keeping sound out?
Other options
Add a acoustic plaster board
Could I incorporate sound proofing in rafters and reduce my Insualtion down from 165mm? If so, what product? Rockwool acoustic slab?
Advice please
I was planning to insulate with rigid board at 165mm leaving a 60mm air gap and then plaster boarding.
Is rigid board such as celotex good at keeping sound out?
Other options
Add a acoustic plaster board
Could I incorporate sound proofing in rafters and reduce my Insualtion down from 165mm? If so, what product? Rockwool acoustic slab?
Advice please