The build
Work on site began during March with the construction of an external, double-skinned wall to close off the post-production room area under what was previously an overhanging porch. Mains wiring, alarm and network cables and audio multicore were run in from outside in preparation for the work. The first photograph to the left shows how the exterior looked before this wall was built, with mains wiring cables already hanging in place through the ceiling. The opening for the observation window between control room and studio was also knocked through (see second photograph). Joists were fixed to enable the acoustic membrane to be hung across the ceiling area and isolate the area from classroom noise from above.
We experienced a delay of three weeks while specialist materials were shipped over from Barcelona. However, work began again on April 14th with the acoustic membrane being fixed around the interior to completely encase the room. Any pipe work on the walls was boxed in and the cavity packed with mineral wool (see photographs).
Once this had been done, timber studwork frames were constructed within the rooms. These will form the walls of the studio and control room areas. To avoid external vibrations being carried through into the studio, the frames stand completely isolated from the concrete floor and the brick walls and are seated on the acoustic lining material.
As the frames were built, thick mineral wool slabs were tightly packed behind them to fill the cavity and add to the sound absorption.
Next, resilient bars, designed to further inhibit the transmission of sound, were fixed to the stud work. The close-up annotated picture shows how these bars space the plasterboard away from the studs and allow for independent movement of the boards. Two layers of boards, of different densities, were fitted, the second layer being further isolated from the first and a heavy damping layer of polymer membrane being sandwiched between them.
The final wall detail can be seen in the picture of the control room window. The total depth of the acoustic isolation walls is around 200mm or 8 inches.
The floors also need to be isolated from the outside world and so floating floors were installed, as shown in the next photograph.
An idea of how the interior of the control room looked as of 2 May can be seen in the next picture, which shows the openings for the door and the window through to the studio.
Moving back outside, you can see how the exterior brickwork (which forms the new post production room) has changed the face of the entrance to the Music block. However, the bricks were carefully colour-matched to enable the new work to blend in as well as possible. |