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*Please Note: PhoneStar was previously branded as Phonewell

Soundproofing existing timber ceilings with PhoneStar acoustic insulation is a relatively straightforward task and gives excellent results at reducing both airborne sound and impact sound through timber ceilings. This system will surpass building regulations for sound and it will only reduce room height by a minimal amount. This is a very popular ceiling soundproofing solution when there is no access to the floor from above e.g. in apartment dwellings.

Soundproofing Existing Timber Ceilings


Simple, slim solution offering a high performance and absolute minimal loss of living space, without removing the existing ceiling.


  • Ceiling with existing plasterboard or lath and plaster
  • Optional 48mm x 48mm timber battens with 50mm x 45kg/m3 density mineral wool between studs, for better results
  • 16mm standard Resilient Bars
  • 15mm PhoneStar Acoustic Insulation
  • 12.5mm or 15mm sound resistant plasterboard
  • Optional second layer of plasterboard

Materials List: (available from our stockists)

  • Optional 48mm x 48mm timber battens, for better results
  • Optional 50mm x 45kg/m³ density mineral wool between battens, if used
  • Resilient Bars (3m x 75mm x 16mm)
  • Drywall screws to secure resilient bars to joists or battens
  • PhoneStar Acoustic Insulation (1200mm x 800mm x 15mm)
  • PhoneStar Eco-tape (50m x 50mm)
  • Drywall screws (25mm length) to secure PhoneStar to resilient bars
  • Sound resistant plasterboard (2400mm x 1200mm x 12.5 or 15mm)
  • Drywall screws (38-42mm length) to secure plasterboard through to resilient bars
  • Flexible mastic or Acoustic sealant

Please download the full installation instructions for soundproofing existing timber ceilings before commencing work:

Brief Instructions: (have you considered Flanking Noise?)

1. Make existing ceiling sound by removing any loose material.
2. If using 48mm counter-battens, secure them at 400mm centres and perpendicular to the joists. Fill the void between the battens with 50mm x 45kg/m³ density mineral wool.
3. Secure the resilient bars at 400mm centres and perpendicular to joists (or battens if using) using drywall screws. Ensure bar ends do not touch the perimeter walls – leave a 5mm gap. Note: the first and last bars should be approximately 50mm clear of the nearest walls.
4. Screw PhoneStar into the resilient bars with 25mm drywall screws which must not make contact with the timber structure, being careful to leave screw heads just below the board surface. Do not leave any gaps between or around the PhoneStar layer. See Cutting and Taping PhoneStar.
5. Using 38mm drywall screws, screw through the plasterboard and PhoneStar into the resilient bars, being careful to stagger joints and to leave a 5mm perimeter gap around the perimeter walls. Optionally add a second layer of plasterboard with staggered joints.
6. Seal 5mm perimeter gaps with flexible mastic or acoustic sealant.
7. Finish plasterboard as required.
8. Consider treating any identified flanking walls with PhoneStar.