Custom Audio Designs Ltd 

Part E | Robust Details | Building Regulations | Sound Insulation


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Ceiling Treatment - Board and Resilient Bars

Resilient bars decouple the ceiling from the floor slab and greatly enhance the acoustic performance of the floor.

For in-situ concrete slabs supported by profiled steel decking:

  • Ceiling plasterboard board must be at least 8kg/m².
  • C must be greater or equal to 300mm for use with RD (E-FS-1).
  • Resilient Bars may be fixed directly to the underside of the deck.

For pre-cast unit with screed floors:

  • Ceiling plasterboard board must be at least 10kg/m².
  • D must be greater or equal to 65mm for use with RD (E-FC-1).
  • This form of ceiling treatment is only suitable if pre-cast units are greater or equal to 200mm deep and greater or equal to 300kg/m².

All ceiling joints must be sealed with tape or sealant.

Ceiling treatment must be installed in accordance with the manufacturers instructions.

Downlighters or recessed lighting.

Downlighters may be installed in the ceiling with no significant loss of acoustic performance provided that:

  • There is a minimum ceiling void of 75mm.
  • Lighting is installed in accordance with the manufacturers instructions.
  • There is no more than one light per 2m² of ceiling area in each room.
  • The centres between lights are not less than 0.75m.
  • The openings do not exceed 100mm diameter or 100 x 100mm.

Please Note:
Particular attention should still be paid to Building Regulations Part B - Fire Safety. We can supply Acoustic Rated Fire Hoods which maintain a 1hour fire rating as well as minimising acoustic loss.


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All information contained in these details is given in good faith but without warranty.
Custom Audio Designs reserves the right to alter the specifications of any product without notice.
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