Geluidsreductie Ondervloeren
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We kennen in Nederland veel
appartementen, waarbij in het reglement vrijwel altijd een 10 dB contactgeluidreductie
norm wordt vastgelegd. Deze norm is gebaseerd op een advies van de NSG
(Nederlandse Stichting Geluidshinder) uit begin jaren 80. De 10 dB norm
is gebaseerd op de algemeen geaccepteerde vloerbedekking (tapijt), die het
geluid met 10 tot 12 dB verbetert. In de praktijk zit er altijd een
verschil van 11 dB tussen beide waarden. Dus 10 dB delta Llin is 21 dB
delta Lw. Laat je niet in de war
brengen! Meetwaarden hoger dan 13 dB komen in de delta Llin nauwelijks
voor. Als je dus een reductiewaarde op de verpakking ziet staan, die hoger is
dan 13 dB ga er dan maar vanuit dat dit een delta Lw waarde is.
De betere ondervloeren: https://www.debouwmarktshop.nl/Fermacell-2E26-vloerplaat
https://www.unifloor.nl/producten/soundkiller.html
*(Zie onderaan pagina 2 voorbeelden van de betere ondervloeren)
(English translation) We know many apartments in the Netherlands, where a 10 dB impact noise reduction standard is almost always laid down in the regulations. This standard is based on an advice from the NSG (Dutch Noise Abatement Foundation) from the early 1980s. The 10 dB standard is based on the generally accepted floor covering (carpet), which improves the noise by 10 to 12 dB.
The NSG issues certificates to subfloors that comply with this impact sound reduction. These certificates can be found on the NSG website and are only used in the Netherlands.
What is meant by 10 dB impact sound reduction? In the market we come across two values: delta Llin and delta Lw. These are unfortunately used interchangeably. In the Netherlands we always talk about delta Llin. The standard used abroad is delta Lw. With contact noise reduction, we always talk about improving the sound insulation, measured on a screed with subfloor and with floor covering.
Both numbers (delta Llin and delta Lw ) are shown on official measurement reports. Measurements are always made in accordance with NEN ISO 14010-2:2013. In simple language one can say that delta Llin says something about the average reduction value in the low tones and the delta Lw about the average in the high tones.
In practice there is always a difference of 11 dB between the two values. So 10 dB delta Llin is 21 dB delta Lw. You will find values of, for example, 16 dB delta Lw on products from foreign suppliers. This seems like a lot, but in practice this is only an improvement of 5 dB delta Llin, which is a minimal improvement.
Don't get confused! Measured values higher than 13 dB rarely occur in the delta Llin. So if you see a reduction value on the packaging that is higher than 13 dB, assume that this is a delta Lw value.
NSG If you really want certainty, take products with an NSG label. These meet the strictest requirements in the field of impact noise reduction and also meet the EPLF* and MMFA** requirements. In short, opt for certainty, opt for NSG certified products.
The better subfloors: https://www.debouwmarktshop.nl/Fermacell-2E26-vloerplaat
https://www.unifloor.nl/producten/soundkiller.html
*(See below 2 examples of the better subfloors)
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