# Sound Transmission through Massive Walls or Floors

## Sound attenuation in building elements like massive concrete walls or floors

The sound transmission through a massive wall or floor depends primarily on the mass of the construction.

Mean attenuation through a massive construction is indicated in the diagram below:

**Note!** - more mass - more attenuation!

The attenuation for a specific frequency can be calculated by adding the value in the table below to the mean value indicated in the chart above.

Frequency ( Hz) | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
---|---|---|---|---|---|---|---|---|

Attenuation Correction ( dB) | -13 | -9 | -5 | -1 | 3 | 7 | 11 | 15 |

**Note!** - higher frequency - more attenuation!

### Example - A Concrete Floor and Sound Attenuation

The mass *m* of a concrete floor with density *2300 kg/m ^{3}* and thickness

*0.2 m*can be calculated as

m = (2300 kg/m^{3}) (0.2 m)

= 460 kg/m^{2}

From the chart above the mean sound attenuation for the floor can be estimated to

52 db

The attenuation *dL* at *250 Hz* can be calculated as

dL = (52 db) + (- 5 dB)

= 47 dB

The attenuation at *2000 Hz* can be calculated as

dL = (52 db) + (7 dB)

= 59 dB

### Sound Transmission Loss - or Attenuation - for some typical Building Elements

Building Element | Sound Transmission Loss Attenuation (dB) |
---|---|

230 mm brickwork, plastered both sides | 55 |

230 mm brickwork, plastered one side | 48 |

115 mm brickwork, plastered both sides | 47 |

100 mm timber studs, plasterboard both sides, quilt in cavity | 46 |

6 mm double glazing, 100 mm air gap | 44 |

75 mm clinker concrete block, plastered both sides | 44 |

115 mm brickwork, plastered one side | 43 |

75 mm timber suds, plasterboard both sides | 36 |

6 mm single glazing | 29 |

one layer plasterboard | 25 |

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