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Typical Structure-Borne Sound Transmission.

Posted by Halcroman on September 21, 2008 at 22:15:47:
The (Air-Borne) music from your downstairs neighbour is being absorbed into the structure to become.......surprise, surprise......Structure-Borne sound. The Mid to High frequencies can be absorbed into heat by the concrete floor separating your apartments, but the large wavelength Lower frequencies will tend to pass through the concrete to be converted back to Air-Borne sound. I'm guessing that that there is no suspended plasterboard ceiling under the concrete slab?.......for if there is, it provides the cheapest and easiest cure to the problem. A double layer of plasterboard ceiling suspended off the concrete soffit by 3" and fixed thereto by rubber/neoprene pads, with the 3" gap packed with 4" fibreglass or rockwool insulation should cure most of the problem. All the edge gaps of the ceiling to the walls and windows must be sealed with an elastomeric sealant (silicone) for it to work properly.
If this is not possible, only a floating concrete floor placed on top of your existing floor, will challenge the problem.
Newer apartment buildings can often have prestressed concrete floors which are often THINNER than traditional reinforced concrete, and this will exacerbate the problem as well as allow more 'bounce' and movement in the floor.