Step 6Create a room within a room (the difficult bit)
Most soundproofing is done with the 'room within a room' principle in mind: construct a separate room within the original building with minimal contact. If space allows, run a new wall of high-density concrete blocks internally, mounted on thin neoprene (a type of synthetic rubber compound) so that the blocks are not directly on the floor.
Tie them to the outer walls using acoustic wall ties and, once you have soundproofed the original roof using mineral wool placed between the beams and a couple of layers of plasterboard mounted on resilient channel, do the same thing again on a second roof mounted to the new internal wall.
These internal walls can then have 2x2 timber attached vertically, again mounted on neoprene, and after pushing in 2" thick mineral wool inbetween the studs, our two layers of plasterboard can be fitted onto resilient channel. Finally (phew!), all surfaces should be sealed with decorators caulk – a small hole in the surface, which can be caused by cracks around the surface of a wall, can compromise its efficiency by up to 50 percent.
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