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*Please Note: PhoneStar was previously branded as Phonewell

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

Soundproofing Solid Concrete Ceilings



Superior performance without losing much room height. Ideal in apartments or offices where there is no access to the floor above.


  • Ceiling with or without existing plasterboard
  • 48mm x 48mm timber battens
  • Optional 50mm x 45kg/m³ density mineral wool between battens
  • 16mm standard Resilient Bars
  • 15mm PhoneStar Acoustic Insulation
  • 12.5mm or 15mm Sound resistant plasterboard.

Materials List: (available from our stockists)

  • 48mm x 48mm timber battens
  • Solid substrate fixings to secure battens to ceiling substrate
  • Optional 50mm x 45kg/m³ density mineral wool between battens – recommended
  • Resilient Bars (3m x 75mm x 16mm)
  • Drywall screws to secure resilient bars to 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 (38mm length) to secure plasterboard through to resilient bars
  • Flexible mastic or Acoustic sealant

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

Brief Instructions: (have you considered Flanking Noise?)

1. Make existing ceiling sound by removing any loose material.

2. Secure the 48mm battens at 400mm centres with solid substrate fixings. Optionally 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 the battens with 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 battens, 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. Screw plasterboard through PhoneStar into the resilient bars with 38mm drywall screws, being careful to stagger joints and leaving a 5mm perimeter gap around the perimeter walls. Optionally add 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.