Poppy
Is general insulation good enough to act as sound proofing too? Or is that a different issue altogether?
Have look on fleebay theres loads. id cut and paste some, but for some reason i cant paste on here? As to your question depends on which insulation your thinking of using?
Stopping heat loss and noise use completely different technologies. Heat is retained by trapping air in tiny pockets. Noise is transmitted through air but stopped by dense materials.
My brain should do the job then lol