Acoustic Liner Carpet Underlay - Stage 2

Thermal and Acoustic Modern Underlay
1.7 sq/m (18 sq/ft) Acoustic Liner
1.7 sq/m (18 sq/ft) Acoustic Liner Carpet Underlay - Interior Stage 2


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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.

Our premium underlay is todays answer to predated jute and cotton mill scrap traditionally used under carpets.

Our Acoustic Liner will not rot, attract mold, is easy to cut and does not require the application of glue.

Our Acoustic Liner can also be used throughout your vehicle as a general purpose thermo acoustic barrier.


  • 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 is also effective as a thermal barrier to reduce heat transfer from the exterior of your vehicle.  The material will reduce radiant heat by up to 20°C, and can be the difference between discomfort and pleasure


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
Customer Reviews

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Top quality Liner

By: on 12 October 2020
Recently use this liner in my capony, awesome stuff so easy to use. highly recommend it.


Great product

By: on 24 August 2020
Great product, super fast delivery and great people to deal with, highly recommend


Good stuff

By: on 26 July 2020
Good product, good level of adhesion little bit forgiving but still sticks well


HZ One Tonner

By: on 18 November 2019
Great stuff to use. Very noticeable difference in the cab. I plan to use car builders in my dad's car and other future builds. Can't recommend this stuff enough