Sparrowhawk Posted July 12 Share Posted July 12 I've got a few places (up to 1m deep) where I can't lift the floor to fit acoustic insulation as stud walls and plant are already in place. The stuff I bought (Knauf Acoustic Roll) is too fluffy to be able to shove horizontally - it bends, tears and refuses to cooperate. What's going to be best to insert here? Rockwool Sound Insulation Slab or similar? Link to comment Share on other sites More sharing options...
crispy_wafer Posted July 12 Share Posted July 12 I was using the knauf stuff in ceilings but ran out with a few sections left. I purchased some Ursa APR to finish off. It's a lot more rigid, but it's also not the nicest stuff to handle. RWA45 is also quite rigid. Link to comment Share on other sites More sharing options...
saveasteading Posted July 12 Share Posted July 12 Acoustic roll is just a few dB better than thermal insulation, so use any that will stay in place. Have a look at Knauff Dritherm Link to comment Share on other sites More sharing options...
ProDave Posted July 12 Share Posted July 12 Frametherm 35 is quite stiff. I left this test piece for 6 months without any support and it did not budge or slump. But I would want something under it to support it. 1 Link to comment Share on other sites More sharing options...
jfb Posted July 12 Share Posted July 12 Rockwool r45 (I think it is called) will friction fit if cut right Link to comment Share on other sites More sharing options...
saveasteading Posted July 12 Share Posted July 12 48 minutes ago, ProDave said: Frametherm 35 is quite stiff. I meant frametherm. Easy to cut to shape, and springs to self support, and squeezes into corners. That will catch airborne sound but not impact. Link to comment Share on other sites More sharing options...
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