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*Please Note: PhoneStar was previously branded as Phonewell

Soundproofing concrete floors with PhoneStar acoustic insulation is a relatively easy task and gives excellent results at reducing both airborne sound and impact sound. This system will surpass building regulations for sound and it will only reduce room height by 15mm. This is the Ideal Solution for Soundproofing Solid Concrete Floors, and it requires access to the floor above as well as to the ceiling below. If access to the ceiling below is not available see our other options in Soundproofing Floors.

Concrete Floor Solution



Will meet and exceed Building Regulations for the Passage of Sound for New Build, Change of Use, Remedial and Refurbishment projects. This is a simple, slim solution which offers ultimate performance.

  • Finished floor surface or top-deck
  • 15mm PhoneStar Acoustic Insulation
  • Solid concrete floor
  • Optional 2″ x 2″ timber battens (highly recommended)
  • Optional 50mm deep x 45kg/m³ mineral wool in between battens (recommended)
  • 16mm standard Resilient Bars
  • 12.5 or 15mm Sound Resistant Plasterboard
  • Optional second layer of plasterboard

Materials List: (available from our stockists)

  • PhoneStar Acoustic Insulation on Floor (1200mm x 800mm x 15mm)
  • PhoneStar Eco-tape (50mm x 50M)
  • Optional 48mm x 48mm timber battens (recommended)
  • 6mm diameter hammer fixings to secure battens directly to concrete ceiling
  • Optional 50mm x 45kg/m³ mineral wool in between battens (recommended)
  • Resilient bars (3M x 75mm x 16mm deep)
  • Drywall screws to secure resilient bars to joists OR 6mm diameter hammer fixings to secure resilient bars directly to concrete ceiling
  • Sound resistant plasterboard (2400mm x 1200mm x 12.5 or 15mm) – 1 or 2 layers
  • Drywall screws (25mm length) to secure plasterboard to resilient bars
  • Drywall screws (38-42mm length) to secure 2nd layer of plasterboard to resilient bars
  • Flexible mastic or Acoustic sealant

Please download the full installation instructions for Soundproofing Concrete Floors before commencing work:

Brief Instructions: (have you considered Flanking Noise?)

Floor Above

1. Treat new concrete floors with a damp proof membrane.

2. Ensure the floor is clean, dry and sufficiently level.

3. Begin in one corner and lay the PhoneStar boards on the sub-deck, butted tightly up to the perimeter walls. Do not screw or nail the boards down.

4. Butt each PhoneStar board up tightly to each other and do not leave any gaps between or around the PhoneStar layer. Lay in a brickwork formation if possible. See Cutting and Taping PhoneStar.

5. Install the finished floor surface as per Fitting Floor Coverings over PhoneStar.

6. Fit skirting boards ensuring no contact with the floor – leave a 2mm gap.

Ceiling Below

7. Make ceiling below sound by removing any loose material.

8. Optionally secure 48mm battens at 400mm centres with suitable hammer fixings. This is highly recommended to reduce vibrations.

9. Optionally fill between the battens with 50mm x 45kg/m³ density mineral wool.

10. Secure the resilient bars at 400mm centres and perpendicular to the battens, if using, with drywall screws. Use hammer fixings to secure resilient bars to ceiling, if not using battens. 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.

11. Screw plasterboard into the resilient bars with 25mm drywall screws which must not make contact with the timber battens or concrete ceiling – leave a 5mm perimeter gap around the perimeter walls.

12. Optionally add second layer of plasterboard with staggered joints.

13. Seal 5mm perimeter gaps with flexible mastic or acoustic sealant.

14. Finish the plasterboard as required.

15. Consider treating any identified flanking walls with PhoneStar.