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SOUND ISOLATION Obviously the biggest determinant here is the cost v isolation required. This building is in an industrial area so we can make noise, next door is a Iron Gate/Hinges etc. etc. manufacturer who doesn't make any real noise and our building is double brick as is theirs with a driveway and alley separating us. On the other side they don't make any noise either, haven't heard anything yet. Below is a car repair workshop who occasionally bang something but there is 150mm (6") of concrete in the floor between us. Our main noise problem is the railway line behind the buildings on the other side of the street and the rain. The railway isn't bad at all as the main trains are electric passenger trains and you can't hear them at all. The trucks in the street are noisier. There is the odd freight train but they are only around 1 or 2 a day/night and the floor shakes a bit then. Considering that we have decided not to float the floor which would be quite expensive in timber/flooring and insulation. So we are going to build directly onto the concrete floor and isolate the frame with rubber top and bottom. FRAMING The ceiling has been totally sealed and this will stop the rain noise. The roofing is Asbestos Cement which is one of the quieter roofings anyway. The first thing was to mark out the studio on the floor with chalk string and we are now going to start on the outer framing. This will stretch between the floor and the ceiling all the way around and be isolated from the ceiling and the floor with rubber. We had a job finding an affordable rubber. We found some neoprene that was 50mm wide and 6mm thick but it would have cost $1700 to do the whole place. Instead we found some foam rubber 20mm (3/4") thick in 2m x 1m (7' x 3') sheets. We got three sheets for $310 which is more like out budget.
Someone
thinks its his new bed We
will cut it into 50mm (2") strips and lay under the 95mm
x35mm (4" x 1 1/2") framing. The rubber cuts easily
with a Stanley knife
We will also use the rubber to seal to the ceiling at the top of the frames. As you can see when the weight of the framing and plasterboard goes on, the rubber will compress down really well. The concrete floor isn't exactly flat and bows in sections so this will clear up the unevenness. Cheers
John
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