Which acoustic insulation for cieling?

[brianb]

I have a small tv room (3m x 3m) as part of our extension where building which needs 100mm insulation for the ceiling and 50mm for one stud wall,

Came across this however I have no idea if this is a good price/spec, some info or advice would be great
(been looking at the 80kg/m3 density)

http://www.noisestopsystems.co.uk/acoustic-insulat...

Edited by brianb on Wednesday 29th January 19:27

[-Pete-]

Except after C

[brianb]

Cheers for spelling advice, insulation advice I was after tho

[VEX]

Tonker should be around somewhere here, he has spec'ed and fitted the sa,e stuff they installed at T5, Heathrow for soundproofing!

So there are now two reference sites for it!

V.

[plfrench]

Density can be a bit misleading when talking about mineral wool insulation for acoustic purposes. Stone mineral wool needs to be roughly twice as dense as glass mineral wool to achieve the same acoustic reduction performance in terms of Rw dB.

I'm assuming there will be plasterboard lining beneath the ceiling and to either side of the partition wall. There is a well known principle of mass-spring-mass for acoustic noise reduction, whereby the use of a high density material (e.g. plasterboard) reduces lower frequency sound transmission, and a lighter material takes care of higher frequencies. In the case of mineral wools which act as the 'spring' part,a large amount of their performance comes from the damping effect of their fibres which move with the sound waves as they pass through, reducing their energy.

I would suggest for home cinema sound, where higher levels of low frequency are likely to be present, that a high level of mass should be used, so double layer acoustic plasterboard such as 2x15mm British Gypsum SoundBloc, with a glass mineral wool within the structure filling around 75% of the available void, i.e. Isover Acoustic Partition Roll APR1200.

Another point to note, is that when it comes to higher levels of low frequency sound, structure borne transmission is likely to be more of a problem. This is where the sound travels through the framing structure. As such I would think about the use of resilient bars, which are metal strips used to isolate the plasterboard lining from the structure.

For more information, have a look here:

Partition (Quiet SF) www.british-gypsum.com/~/media/Files/British-Gypsu...

Floor (Silent) www.british-gypsum.com/~/media/Files/British-Gypsu...