Fibre Board Underlay

£17.00 per pack £14.17 per pack (inc VAT) (ex VAT)
  • In stock - available from 18 December
  • Free UK delivery when you spend £199 £166
  • Available on orders over £600
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Natura Fibreboard underlay has exceptional thermal insulation which is perfect for use on very cold subfloors to make your room feel so much cosier and comfortable. Helps to level sub-floor irregularity/unevenness up to 3mm and has acoustic insulation of up to 18dB.


Product Code: QAU-FFF-03
For Use With: Laminate
Weight: 8.8kg
Dimensions: 5.5mm (t) x 590mm (w) x 850mm (l)
Pack Size: 7.02m2
Pack Contents: 14 Sheets
FSC Certification: FSC 100% SGSCH-COC-007285
GTIN: 5060227650629
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Ratings & Reviews

Reviews of Fibre Board Underlay

  • 3 Reviews

5 Stars


does what it says on the tin good quality

By Anthony Guatella from Glasgow on 20 Apr 2017

5 Stars


Good underlay at a great price what more can you ask for

By Helen Lodge from Leeds on 03 Jun 2016

5 Stars

Same as more expensive boards

Bought these but didn't really expect them to be as good as the more expensive boards available on different site. The definitely seemed the same to me and were perfect under my laminate floor.

By Angela Palmer from Wakefield on 28 Apr 2016


I'm told by our Building Inspector that the underfloor insulation for our suspended wooden floor should achieve a U-value of 0.25 W/m2K or less. We are considering using the best insulation board/solution available as part of installing engineered wood flooring, so avoiding installing insulation below the floorboards - is this product meeting the required U-value? If not, can you recommend an alternative? Looking for good sound absorption too/ Regards, Alan

Asked by Alan Roach from Cardiff on 18 Nov 2017

1 Answer

Hi Alan, we're happy to say that this underlay has a U-Value of 0.050W/m2K

Does this product need an extension gap and how much? Also are the edges square so butt up nice and smoothly? How would you recommend joining the boards under vinyl (eg a special tape?)

Asked by Tracey France from Billingshurst on 11 Jul 2017

1 Answer

Hi Tracey, the boards simply butt up against each other, with no need for tape. Expansion gaps are only needed for permanent home fixtures such as walls and fire places.

Hi there, I am looking to put flooring down which will be continuous between my kitchen and extension. The floor of the kitchen is a suspended timber floor and the extension is a concrete slab. Would this fibre board underlay be suitable to work on both substrates? Thanks

Asked by Peter Virtue on 20 Mar 2017

1 Answer

Hi Peter, yes, this underlay will be fine for both substrates, you'll just need to make sure you use a DPM over the concrete subfloor to protect against rising moisture.

What is the thermal conductivity of this board?

Asked by Jean Susan Whitaker from CB25 0EY on 15 Feb 2017

1 Answer

Hi Jean, the thermal conductivity is rated at 0.050W/mK.

I'm trying to avoid ripping up kitchen tiles, Is this underlay suitable to used on top of the tiles and then laminate or lino over?

Asked by Nicola on 09 Feb 2017

1 Answer

Hi Nicola, as long as the surface is clean, flat and even, this should be fine

Hi, Is this underlay suitable for use under a laminate on a concrete floor on its own, or would I need a DPM as well?

Asked by Ian Hole on 28 Jan 2017

1 Answer

Hi Ian, this underlay would need a DPM if it's being used over a concrete subfloor.

Hi, is this underlay suitable to go under Carpet Tiles?

Asked by James Fiske on 10 Jan 2017

1 Answer

Hi James, I'm afraid not, this is for hard floors only.

Is this underlay compatible with engineered wood floors? Thanks

Asked by Jehan-zaib Aslam on 19 Dec 2016

1 Answer

Hi Jehan-zaib, This underlay is absolutely compatible with engineered flooring.

We are looking to use fibre board as underlay in a soon-to-be made accessible bungalow with concrete floors. My wife is a wheelchair user and cannot propel on standard underlays or on thick pile carpets. We are looking to increase thermal insulation property also. Is there an ideal board for use in bathrooms under carpet also? Bedrooms, bathroom, hall and lounge will be carpeted whilst kitchen and utility will have lino. Thanks.

Asked by Mick Phythian from York on 14 Nov 2016

1 Answer

Hi Mick, This underlay is designed to be used with laminate and wood floors, not carpet. Sadly, we don't offer carpet underlays, so you're best to go to a carpet specialist for that.

Your answer to Dilan (above) says there are actually 20 boards per pack. Your product information still states that there are 14. Which is it?

Asked by Kevin Cheeseman on 16 Aug 2016

1 Answer

Hi Kevin, Well spotted! This product has recently changed from 20 sheets to 14 sheets - we'll be sure to update our above answer to reflect the changes.

Can tiles be laid on top of this insulation?

Asked by Steve from Essex on 16 Apr 2016

1 Answer

Hi Steve It would depend what type of tiles. If you give us a call we will hopefully be able to help.

Hi, On this product you say that it is 7sqm per sheet, and you give dim of 5.5mm (t) x 590mm (w) x 850mm (l), how does these two go together exactly? For a room of 12sqm how many of these sheets do I need pleae?

Asked by Dilan Roshani from Nottingham on 25 Mar 2016

1 Answer

Hi Dilan, Well spotted, thank you! This product actually covers 10.03sqm (the specs have now been updated) with each pack, and each pack contains 14 sheets. For a 12sqm room you'll need 2 packs. Thank you for letting us know.

Hello is this underlay suitable for underfloor heating when used with laminate flooring?

Asked by Nita Lear from Sunderlanf on 20 Jan 2016

1 Answer

Hi Nita, This is a particularly thick underlay which is great for insulation. It also means it's not great for underfloor heating, because it'll block the heat. A felt underlay would allow a lot more heat to pass through.

is this underlay suitable for splash zones? thanks

Asked by rachel wilmot from redcar on 20 Jan 2016

1 Answer

Hi Rachel, I'm afraid that this underlay isn't waterproof, so it could cause you problems down the line. Instead, we'd recommend one of our underlays with a built-in DPM (Damp Proof Membrane) Thanks
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