Sound reduction index of doors

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The sound insulation of doors usually refer to the laboratory or test value R _{w, P} . In the built-in state, values approx. 5 dB lower are achieved due to secondary noise paths and assembly tolerances . For this reason, the weighted sound reduction index R _{w, P} (measurement in the test room) must be at least 5 dB higher for doors than the R _{w, R} value required for the respective purpose .

R _{w, R} = R _{w, P} - 5 dB for doors

Doors are divided into different sound insulation classes. The requirements and recommendations for certain types of use result from DIN 4109 and VDI 4100 .

Sound insulation class (SSK)	designation	Building sound reduction index R w, R	Test sound reduction index R w, P
0		min. 22 dB	min. 27 dB
1	Doors that lead from hallways or stairwells into hallways and hallways of apartments or work rooms	min. 27 dB	min. 32 dB
2	Doors between classrooms or similar rooms and corridors as well as for hotels and accommodation facilities.	min. 32 dB	min. 37 dB
3	Doors that lead from hallways or stairwells directly into living rooms as well as for treatment rooms in practices.	min. 37 dB	min. 42 dB
4th	special cases	min. 42 dB	min. 47 dB