Home Soundproof Garage - Garage Conversion Stage 2 Soundproof a Room Stage2 Part 5
Soundproof a Room Stage2 Part 5

Drummer Soundproof Room Building Stage2 Part 5

In order to gain more height in the practice room, we had to lift the existing joists. In addition to this, the spacing of the existing ceiling joists was not convenient for the new ceiling design, so new joist timbers were added at every roof joist.

In the photo, the joist on the far left is an existing one that was not raised. You can see that the joists were raised by about 150mm (6").

Lift the existing joists and add in new ones

This is one area where extra structural isolation could have been achieved. According to the theory of how a room-within-a-room should be built, there should be no mechanical connection between the inner ceiling and the existing one.

For reasons of simplicity of design and construction, I opted to suspend the new ceiling from the existing one knowing that this would allow a certain amount of high frequency sound to be transmitted from the inner structure to the outer one. However, due to time pressure, I decided to attach the inner ceiling directly to the existing joists.

When designing the inner ceiling, you will face the following problem: how to have a mechanically isolated ceiling that will stay up under its own weight - being supported only around the edges.

After some thinking about it, I believe the easiest way to solve this problem (in my case) is to obtain a few metres of cargo strapping. This is the tough polypropylene strapping that truck drivers use to secure loads onto the flat bed of their trucks. It is very strong under tension and can be used to support the centre of the inner ceiling (The ceiling will become very heavy once you have applied a double layer of plasterboard). The strapping will support the weight of the inner ceiling without transmitting much vibration into the supporting structure

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