In this schoolbuilding of Wijkerpoort, Maastricht, with the gymroom on the top floor of the building, there were complaints about noise in the classrooms coming from sportactivities. The original design was a 150mm concrete floating floor on 50mm mineral wool. During the construction however the 50mm mineral wool layer was reduced to 30mm, and measurements indicated contact between the decoupled floor and the construction floor. It was then decided to have the decoupled floor removed and to design a good floating floor.
In order to design a good floating floor, several tests were done on floors with different air voids. Based on the measurements and the lack of height, the client decided to use a 120mm air gap by using timber as overheight. After installation a transmission loss of 12dB(A) was measured.

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Execution of tests:
CDM-LAT-79050 with 2 layers of Cetris 18mm
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