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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Clearance Acoustic Liner available here.

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
Customer Reviews

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Jeep Wrangler

By: on 17 January 2024
I used this for my jeep wrangler. It’s so much better to drive now. I can here the music and have a conversation ☺️


Sound deadener

By: on 27 December 2023
This it the best stuff to use and looks amazing it's a shame carpet covers it I have used most products carbuilders sell and it's all good stuff this is the only place I think of when doing my projects can't wait to do another car so I can order more from you guys cheers


Acoustic liner

By: on 30 October 2022
Awesome product peeled and stuck well halfway through assembling my car & I can already tell this product has done it’s job well would definitely use again for another build!


Quality stuff!

By: on 31 January 2022
When this is used in conjunction with the Stage 1 deadener, the audible results are truly amazing! A music lover's dream!!



By: on 4 December 2021
Went down great looks great


Acoustic liner for vy calais

By: on 7 August 2021
This was the first time I've eva taken on the task of sound deadening wasn't expecting it to be such a big job i started with the boot then moved onto the floor after removing the the bitumen deadener cleaning that mess up laying sound deadening down I was ready for the acoustic liner first thought was I need to cut this down to more manageable pieces after some planning an watching car builders how to videos i decided to send it as a full sheet an worry about any problems as they got in the way but there was very few as this stuff is mad it is easy to work with as long as you keep the backing peel off to a manageable section an relief cut where needed pressing into corners lump an bumps as you go it works jus as it should highly recommend this product


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