In the page on isolation I describe the standard double wall construction on a floating floor with a resultant wall thickness of 300mm.(1ft). That is 100mm (4")for each wall and a 100mm (4")air space between. The finished room then has a wall surface of plasterboard that requires further acoustic treatment to handle the reflected sound within the room. If you then put 100mm of treatment on each wall you end up with a wall 200mm(8") thick and a total wall thickness including the air space of 300mm (24"). In the home studio space is precious so a small saving of wall thickness can really help. So I have developed a simple and cost effective solution.
This system halves the thickness of the wall (100mm(4") instead of 200mm(8")) and makes the 95mm(4") cavity in the wall available for acoustic treatment. (Slat resonator depicted in drawing) Construction requires building the wall panels on the floor, applying the outer cladding and gluing the insulation to it then standing the wall panels up into place. You end up with a wall with the cladding on the outside and a 100mm (4") cavity for internal acoustic treatment. Obviously the panels must be sealed when connected to each other and if you are using a double or triple layer you can seal it like this.
Offsetting Sheets for a good seal
A ceiling can be built using a similar system. Here again any savings in height can benefit the home studio builder. Support beams are placed on the inner walls and ceiling panels are attached to the beams thus:
This is similar to the wall construction where the gypsum is on the outside thus freeing the 95mm(4") cavity for acoustic treatment.
The beauty of this construction is that it can be made modular. The wall and ceiling panels can be made on the floor then placed in position and joined together with a silicon seal between panels and screwed together and to the floor. They could also be made in a joinery factory and then screwed together at the site. This means it can be disassembled and moved. If you are renting, or shift house, you can take it with you!
The individual wall and ceiling panels can be treated acoustically using different treatments as described in the acoustic treatment pages.
Plans and STC ratings for sealing an existing ceiling can be found on the STC Chart page.
The above drawing shows a typical system for sealing an existing ceiling. The plasterboard is attached to a flexible channel thus mechanically isolating it from the existing ceiling. For even more isolation you can add an extra lining under the existing floor thus:
This system gives an STC rating of around 60 which should stop you from annoying the rest of the house and your neighbours.