Bathroom Stud Walls - Insualtion for Sound

[Conor]

What would you normally use to provide extra sound dampening (75mm metal studs, OSB+PB on both sides) for a bathroom / WC wall?

 

Normal mineral wool (loft type) or cavity batts? The batts are more than double the cost of loft insulation.

 

 

[nod]

ISO acoustic is best Often only 25 thick 

 

I’ve two bathrooms back to back Built a standard party wall Two 50 mil mf studs  with a 50 mil cavity I boarded one side insulated then boarded the second side 

Then built the next wall in front 

You can’t even hear the loo flush from either side 

 

[Dudda]

If you go to the Gyrpoc website and click on the "White Book - C04 - S02 - GypWall Classic" under Related Downloads you see see diagrams and tables of various standard stud walls. You can quickly and easily compare the Sound insulation by comparing the various dB rating numbers.

https://www.british-gypsum.com/literature/white-book/partitions/gypwall-classic

 

You'll be able to compare easily what a 12.5mm regular board provides compared to a 12.5mm soundblock board or two layers of plasterboard and the difference with and without the 25mm isover acoustic insulation.

 

They also have GypWall Quiet, GypWall Staggered, and GypWall Audio, etc. which would provide higher sound insulation. It's going to be a case of how thick you want the wall and to what level of sound insulation you want to achieve but hundreds of possibilities with various levels of sound level and price points.