Trench blocks or cavity wall?

[Wagas]

Hi, what would be be the better option sound wise for an internal wall: 300mm trench blocks or 100mm block/50mm sound insulation slab/100mm block?

 

Quick answer would be much appreciated. Thanks

[Moonshine]

cavity wall

[Wagas]

Thanks! Would you put 50mm or 100mm sound bloc in a 100mm cavity? 

[ADLIan]

A 300mm masonry wall will perform better than a 200mm wall simply because of the additional mass and stiffness - doubt the benefit is worth the cost though. Adding any mineral wool in the cavity of 2 masonry leaves will gain very little (nothing?) as again most of the acoustic performance is from the mass/stiffness of the masonry.