Rothoblaas - Soundproofing Solutions Page 55
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SOUND REDUCTION INDEX... WHAT DOES IT MEAN “IN PRACTICE”? ? Sound reduction index is the ability to reduce noise transmission between one room and another. Sound insulation allows noise thresholds to be controlled and makes the building pleasant and comfortable. a normal conversation can be easily heard and understood great attention is required to listen and understand a loud conversation a loud conversation can be heard but not understood 25 dB 45 dB a loud conversation cannot be heard or understood 35 dB 20 30 40 a loud conversation can be easily heard and understood a loud conversation is perceived as a murmur 30 dB 42 dB 50 53 dB 60 [dB] only some loud conversations are audible 48 dB SOUND REDUCTION INDEX R VS APPARENT SOUND REDUCTION INDEX R' Dd STC ASTC R R’ Sound reduction index (R) is the performance of a partition The apparent sound r eduction index (R'), on the other hand, indicates the performance measured in a test laboratory Dd Ff Fd Df measured on site The acoustic laboratories are constructed in such a way that the chambers are completely decoupled from each other, so that lateral transmissions are completely eliminated. For the same construction assembly and installation, the performance measured in the laboratory will therefore be better than the performance measured on site. IMPORTANCE OF DETAILS In acoustic design, as in other fields, the design and correct implementation of details is very important. It is counter productive to design a high-performing construction assembly if discontinuities are neglected (holes, structure-to-doors/windows connection, wall intersections, etc.). Best practice that: to increase the sound reduction index of a wall constructed of several elements, the sound reduction index of the weakest element should be increased. Rw vs STC STC stands for Sound Transmission Classification. It indicates the sound reduction index of a construction assembly by evaluating sound sources with frequencies between 125 and 4000 Hz. The higher the number, the better the performance. AIRBORNE NOISE | WALL ACOUSTIC PROBLEMS | 57
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