Water Proof Carpet Underlay - Stage 2

Water Proof Carpet Underlay - 3.6sqm coverage
Water Proof Carpet Underlay - 3.6sqm coverage


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Car Builders Water Proof Carpet Underlay is a single layer closed cell foam, meaning it does not hold water. It also works great as a thermal and acoustic insulation barrier.

It is suitable for 4x4's, convertibles and industrial vehicles which get constant exposure to wet environments.

Our Water Proof Carpet Underlay will not stay damp, smell, rot or attract mold like pre-dated cotton mill scrap, traditionally used under carpets.

It comes with a peel and stick backing and is easy to cut and install



  • 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
  • Roof skins
  • Inside cavities
  • 1/4 panels
  • Doors
  • Firewalls


Water proof underlay 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 15°C, and can be the difference between discomfort and pleasure




Resistance Temperature Range:
-40°C to +120°C (long term) +150°C (short term)

Glue Temperature Resistance:
-40°C to +135°C

Flame retardant:
Yes, B2

Customer Reviews

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By: on 3 May 2020
My install in not to turn my gq y60 td42 into an off roader 4x4 etc. It has had 25 years of that and I shipped it over from nz to keep the car I learnt to drive in going. This waterproof liner feels like luxury under the feet. I have both this, acoustic for speaker areas and heavy liner. This is my favorite of them so far. Difficult in the gq with all the euro modifications etc they offered and all the bolts etc. So lined cuts with the fabric tape then the aluminum tape. So far so good. Have added gaffer to some areas that I am still working on.



By: on 28 June 2019
great product ,easy to install and feels good to walk on