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Jargon buster - sound insulation


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A short presentation on what sound insulation is, how it's measured and how to ensure good performance on site.

Published in: Engineering
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Jargon buster - sound insulation

  2. 2. DBX ACOUSTICS OVERVIEW A QUICK Airborne Noise Impact Noise Avoiding Flanking The Difference Between Rw and Dw  SOUND INSULATION
  3. 3. DBX ACOUSTICS BUILDINGS TYPES OF SOUND INSULATION IN There are two main types of noise that are of concern when it comes to sound insulation in buildings. Airborne Noise Impact Noise  SOUND INSULATION
  4. 4. DBX ACOUSTICS NOISE AIRBORNE EXAMPLES OF AIRBORNE NOISE Someone's voice Music from a loudspeaker  Sound from a television Airborne noise is any unwanted noise that travels or transfers through the air. It is most relevant when constructing partitions between rooms.  This is defined as a variant of either Rw or Dw, and is usually specified as a minimum value of insulation which must be achieved. SOUND INSULATION
  5. 5. DBX ACOUSTICS SOUND INSULATION NOISE IMPACT Impact noise occurs when energy passes into a partition from an impact, and re-radiates as noise on the other side. The example of this you will likely be most familiar with is footsteps on a floor that can be heard in the room below - especially concerning in domestic situations.    Impact is a form of structure-borne noise, which many of us have also experienced when neighbours decided to get the drill out and do some DIY too early on a Sunday morning! This is specified as a variant of Lw and, in contrast to airborne sound insulation, is specified as an upper limit which must not be exceeded.
  6. 6. DBX ACOUSTICS SOUND INSULATION INSULATION SOUND Avoiding Flanking and The Difference Between Rw and Dw
  7. 7. DBX ACOUSTICS SOUND INSULATION  SOUND FLANKING AVOIDING DUCTWORK Ductwork passing from room to room may also prove an issue, but cross-talk attenuators (prefabricated sections of ductwork with acoustic lining) can be used to stop ducting acting like a “speaking tube”, and allowing speech to transfer from room to  room. Flanking is sound that transfers from Room A to B through a route other than directly through the partition. This might include junctions of walls with ceilings or floors, if the partition isn’t properly detailed and sealed. It's also common for a hole to be drilled through the partition, for example for cables, then not be properly sealed, leading to excessive flanking. Products like expanding foam won't stop noise from passing through; in any case, the key to sound insulation is mass. To stop sound flanking, small openings need to be properly stopped up with mineral wool and mastic. Larger openings may require a cover plate to perform as intended. 
  8. 8. DBX ACOUSTICS SOUND INSULATION Rw and Dw THE DIFFERENCE BETWEEN Rw The laboratory stated value of the sound reduction index of a building. It can, for example, apply to walls, ceilings, floors, doors, windows, etc. Dw The on-site measured values of the sound insulation. This is the target used to measure against in pre-completion testing. Both Rw and Dw are ways of rating the performance of a partition in terms of Sound Insulation which must be achieved.
  9. 9. SOUND INSULATION DBX ACOUSTICS SOUND INSULATION? SO, YOU WANT TO ACHIEVE DECENT FOLLOW THE "GOLDEN RULES" Get some help on specification from an acoustic consultant - it's not just about the wall / floor Build it properly - sound can be like water, it'll trickle through any holes you leave Throw that expanding foam in the bin... Please?