| I wouldn't bother raising the floor. To do it right (such that "right" = "effective at low frequencies under 100Hz") you will need SERIOUS mass, such as a wood deck, several layers thick, with dry sand between the joists, floated on pucks that have been correctly calculated in terms of number and spacing. It is highly doubtful that the existing structure could bear this kind of weight load. Certainly, it will be essential to consult a structural engineer before attempting something like this.
And, given that this is a rental space I doubt it would be advisable anyway.
A better option, though still probably unrealistic since it's a rental, would be for you to build a room-within-a-room, with an isolated ceiling, in your space. Even this will only be realistic if you are on the ground floor on a concrete slab; even so it is a serious construction job that your landlord will need to sign off on. |