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Acoustic insulation that's tough enough to shove under floors?


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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?

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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.

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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.

 

roof_insulation_8.thumb.jpg.e3187bc4fbb34efae40dcb5480a5b199.jpg

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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.

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