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CDM-LAT

 

 

 



 

CDM-LAT Battens are designed to optimise sound insulation and impact isolation of floor constructions. They are used in both wet and dry floating floor constructions and achieve resonant frequencies of 6 to 10Hz.

CDM-LAT battens come in 3m lengths, have three standard stiffnesses, each in three different thicknesses (30, 40 and 50mm). The three different stiffness rails in increasing stiffness are:
CDM-LAT-L
CDM-LAT-M
CDM-LAT-H

Information required by CDM to carry out the design of the CDM-LAT floating floor system:
1 Type of floating floor, eg. concrete or timber etc¡­
2 Imposed dead and live loads on the floor
3 Performance requirements, eg. natural frequency or sound insulation criteria

Installation Guidelines
1 Install CDM Perimeter Isolation Strips around the perimeter of the floating floor to de-couple the floating floor from the adjacent structure
2 Install the CDM-LAT rails according to CDM¡¯s design
3 Lay low density mineral fibre between the CDM-LAT rails (the thickness of the mineral fibre sound absorption must be less than the deflected void under the floating floor)
4 Screw in formwork panels into the CDM-LAT rails
5 Follow any other site specific installation requirements given by CDM









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.



 


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


Installation of the floor

Finished floor