Car Builders Acoustic Liner is a multi-layer open and closed cell foam with a peel and stick backing. It offers a high level of acoustic and thermal insulation superior to that of traditional jute underlay.

Car Builders premium underlay is today's answer to predated jute and cotton mill scrap traditionally used under carpets. Acoustic Liner will not rot, attract mold, is easy to cut and does not require the application of glue (unless it is being laid in an inverted position).


  • Light Weight
  • Easy installation - just peel off the release liner and adhere to surface.
  • Cuts with scissor and knife
  • Reduces heat transfer
  • Does not rot or deteriorate


  • Under carpets
  • Inside cavities
  • 1/4 panels
  • Doors
  • Firewalls

Each box comes with a single sheet inside, each sheet is 950mm x 1800mm resulting in 1.7sq/m per box. 



Acoustic Liner Carpet Underlay FAQ

What thickness carpet underlay should I use?

Carpet underlay thicknesses range between 4-12mm. This range allows you to insulate effectively and fit it under tighter areas such as the transmission tunnel.


Sheet dimensions
Length: 1800mm
Width: 950mm
Thickness: 12mm
Total Weight: 1kg
Weight/Sqm: 0.55kg


6mm open cell foam (lighter grey colour) and 6mm closed cell foam (darker foam on top).   


Material temperature resistance:  

Cold Resistance: - 40°C
Heat Resistance: short term + 135°C, long term +110°C


Adhesive temperature resistance: 

Cold Resistance: -40°C
Heat Resistance: short term + 150°C, long term +135°C
Flame Retardant: Grade B2
Heat Conductivity Factor: <= 0.034 W/(M.K)    at 0°C

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