Floating floor underlay of IIC 65 as a minimum

Just got my under knocked back advising it needs an IIC of 65 or above for multi story complex.

The underway I had gone for is the quietwalk which has an IIC of 58. Not many high rise complexes I know of asks for a min of 65. I think the BCA standard is like 55 or something.

Anyone know where I can get 65 underlay for a reasonable price?

Thanks.
 
Top