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Sound Reduction Index of a Few Partitions
Here are a few examples of Rw or Sound Transmission Class (STC) values:
20 cm thick reinforced concrete wall: 59 dB 10 cm concrete block wall: 45 dB
Two 13 mm plasterboards screwed on the same side of studs: 29 dB Plasterboard partition made of two leaves of 13 mm plasterboards screwed on each side of 48 mm studs, with mineral wool in between: 47 dB Plasterboard partition made of two leaves of 13 mm plasterboards screwed on each side of 48 mm studs, without mineral wool in between: 42 dB
Sound Reduction Index of Concrete and Mineral Wool by a Simple Model
TNO (Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Oderzoek) (Netherlands Organization for Applied Scientific Research) developed a quite simple and easy-to-use prediction software for the assessment of the sound reduction index of a single or double wall . This software worked rather well as long as the user understood some basic physical transmission phenomena in order to be able to simplify and fit the reality into the model. Unfortunately, adding a mineral wool on one side of a 20 cm thick concrete wall would boost the sound reduction index from 50 to 70 dB. This was due to the absence of safeties on the entries (who would put unprotected wool directly onto a wall?).
Lesson Learned: Do not blindly trust a model.
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