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Sound Insulation

First, holes (e.g., from previous mechanical equipment or fixations) will be sealed.

Schematic cross section of the tenant's room and neighbors

Figure 18.1 Schematic cross section of the tenant's room and neighbors.

The most efficient acoustic way of improving the sound insulation of the bedroom is to prevent noise radiation from its envelope.

There is not much hope of achieving anything on the floor, as it would mean a floating floor, with a step to enter the bedroom. However, should such an improvement be sought, there are manufacturers providing heavy wooden panels assembled on resilient pads and featuring a mineral wool glued on their underface (e.g., [1]). Please kindly note that a 10 cm height is needed for such a construction.

Note: It usually is ill advised to try to pour concrete on the existing floor. To start with, it will considerably increase the weight per floor area (to an extent not necessarily compatible with structural limitations), and more to the point, it will result in a stiffer floor that may generate a higher impact noise.

Next, a metal structure will be built in order to support the additional walls and the ceiling. There are manufacturers providing strong enough structural elements to avoid a structural connection with the upper floor and the walls (e.g., [2]). If a floating floor has been chosen, then those structural elements will be mounted on it rather than on the structural floor. Plasterboard plates will be screwed on this metal structure, with a 100 mm mineral wool between structural elements.

Note: Already, 35 cm has been eaten up on both horizontal dimensions of the room and the vertical dimension.

A new window will be built and attached to the inside plasterboard walls. It will have to be wider than the regular window in order to allow for its opening. It will typically feature a sound reduction index Rw + C of 30 dB.

Note: The actual required performance will depend on the improvement targeted on the sound insulation to the other spaces. Remember, there is a need for balance between the various noise contributions!

Note: Using a floating floor, it also means that the door-window, if any, will have to be replaced due to the step to be introduced.

A new door to the corridor will be built and attached to the inside plasterboard walls. It will have to be wider than the regular door in order to allow for its opening. It will typically feature a sound reduction index Rw + C of 30 dB.

Note: The actual required performance will depend on the improvement targeted on the sound insulation to the other spaces. Remember, there is a need for balance between the various noise contributions!

Note: Using a floating floor, it also means that the original door will have to be replaced due to the step to be introduced, that is, unless this door is made to open to the corridor, but do be careful on opening due to the risk of bumping into it when going into the corridor!

 
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