Wallrock Thermal Liner

Wallrock Thermal Liner

I won’t give all of the technical detail here. Click this link to read more about Wallrock Thermal Liners on the Cover Your Wall website.

Recently, Wallrock KV600 Thermal Liner has been added as one of our products. It’s 4 mm thick (20% thicker than standard Wallrock Thermal Liner). Read KV600 Thermal Liner review here.


Before we look into how Wallrock Thermal Liner is built and how it works, some key facts from the manufacturer:

  • it reduces room warm up time by up to 65% and can offer up to 36% energy saving
  • provides noise insulation: aw=0.02
  • helps with fighting the mould

Read and see below and you’ll realise that apart from the thermal benefits, Wallrock Thermal Liner will cover some pretty rough walls – it’s 3.2 mm thick. I’ve always wondered how some retailers can make claims about their thin wallcoverings (0.5 mm) being able to cover things like woodchip!! Do they really think we are…not very clever?

Has it been tested? British Board of Agrement (BBA) tested Wallrock Thermal Liner and decided it saved 15% of the static heat loss. However, we fed the same raw data numbers to one of our customers who works with ‘these things’ and he reckons it’s 20%, but we’ll stick to the official figures. In order to get a rough idea of the potential savings, please use this Wallrock Thermal Liner Saver Calculator to get a rough idea.

How thick is it? 3.2 mm thick. Below you can see an image where I used a pencil to show how thick the Thermal Liner is. As it’s not stuck to the surface, it bends upwards in the middle though. Yes, it’s flexible (it comes on a roll); however, when tackling sharp corners I’d suggest you cut it and not bend it or you’ll end up with slightly round corners.

How thick is wallrock thermal liner?

Wallrock Thermal Liner thickness

What is it made of? Below is a side image of Wallrock Thermal Liner. On the left you have a flat and paintable surface (a layer of Wallrock Fibreliner), which is backed  by the thermal layer. In simple terms, the thermal layer reflects the heat back into the room / doesn’t allow it to sink into the wall as fast thus allowing your room to heat much faster and stay warmer. No, it’s not the same as outside (or in-wall) insulation and nobody is claiming it’d do the same job, but the costs are vastly different. The product came about when some white-coat lab guys looked into technologies used by NASA and the car industry.

You can paint Wallrock thermal liner

Two sides of Wallrock Thermal Liner

What about the finish? The image below shows a sample of unpainted Wallrock Thermal Liner against a painted wall (there’s no Thermal Liner on this wall though). This image has been magnified, so please take this into consideration.

Wallrock Thermal Liner has paintable surface

Unpainted Wallrock Fibreliner against a painted wall

So, Wallrock Thermal Liner is on the wall. What next? Paint it – job done! But you can do more, if you want to.

You can overline it with Wallrock Fibreliner, Wallrock Premium or Wallrock Trend paintable wallpapers (depending on the finish you’d like to achieve). No, you shouldn’t be using traditional lining paper or wallpaper – more about it on coveryourwall.co.uk, but we’ll be talking about this here soon. Below is an image of where the two lengths of Wallrock Thermal Liner meet on an uneven wall. Because it’s 3.2 mm thick it can create a slight level difference where the two lengths meet – in this case the wall is in a very old cottage. For some it’s not a problem at all whilst others would like to avoid it. This is the reason why we suggest you can overlay it with one of the above products and cover any of the problematic areas.

Wallrock thermal liner application issues



  1. Thank you for finding the time to explain the terminlogy to the learners!

  2. OnWall

    We got a couple of emails asking about Wallrock Thermal Liner reviews from people who have used it. You can read them in full on coveryourwall.co.uk, but below you’ll find just a few excerpts.

    Review 1:
    We found it easy to apply and have noticed a big difference in what was a cold back bedroom. We were also really pleased with the way it covers imperfections on the wall underneath. All traces of messy filled in plaster are now gone and the wall looks smooth…

    Review 2:
    I found wallrock thermal quite easy to use, particularly as the paste is applied to the wall. It was too awkward to hang it from the roll, so I just cut lengths and hung those. You do need very strong sharp scissors or knife to cut it…

    Review 3:
    The paper gave a very good finish on my rough cracked walls. I used wallrock fibreliner to cover wallrock thermal. Best of all it didn’t stretch or bubble and gave a beautifully smooth finish…

    Review 4:
    The actual installation of these products, although a lot different from more conventional wall coverings, was much easier than I had anticipated. I was particularly worried about the external corners of the chimney breast. However I was advised to butt the two sides together as best as possible, and then to fill any gaps with a proprietary filler and the end-result is actually very satisfying.

    Review 5:
    Applying the thermal liner is straight forward. Just bear in mind it is quite thick so cutting / trimming is harder than normal wallpaper. The results are good; the walls feel warmer and the rooms seem to heat up more quickly…

    Review 6:
    [About Thermal Liner Adhesive] I think one should stress you need much less rolling compared to painting or you end up spreading it too thinly.

    Review 7:
    I used this for the first time recently. Two walls really were in need of replastering and I was sceptical if this product would work. The end result was very good. Not very easy to handle and cut but with patience its quite do-able. Not that easy to get a clean edge on external reveals but with a sharp blade for every cut and practice it’s ok and if your overhanging with Wallrock Fibreliner minor errors are concealed. Plug sockets, light swiches and skirting could be a problem with this product and you would preferably need to run run it under rather than around which does give a neater finish…

    Review 8:
    Having now put up the Erfurt MAV Wallrock Thermal Liner 75 and the Erfurt MAV Wallrock Fibreliner 75, and being delighted with the finish I wanted to write and send these comments.The Thermal Liner went up on the one external wall really easily, and having fitted the Fibreliner to the other 3 wall I decided to overlay the Thermal Liner with the Fibre Liner.The finished effect was sensational, it looks just like a newly plastered wall…

  3. OnWall

    Q: The room I will use it in has been decorated with lining paper and painted over several times over the years. As it will be VERY difficult to remove it, I was wondering if the Thermal Liner can be hung on top lining paper?

    A: There are two things one needs to be mindful of / carry out before applying Wallrock Thermal Liner over an existing wallcovering.

    1. Is the lining paper adhering to the wall properly or is it loose in any area? If the lining paper isn’t stuck to wall properly and you apply the adhesive to it (before hanging wallrock thermal liner) the lining paper could come off with the wallrock thermal liner.

    2. If lining paper is adhering to the wall well, you’ll need to sand the paint on the lining paper to provide rougher surface for the adhesive to grip to. Please ensure that the surface is then dust-free.

  4. Douglas

    Can I apply Erfurt MAV Red Label insulating lining paper directly onto Anaglypta using Wallrock thermal lining adhesive?

    • OnWall

      Yes, you can. However, Please consider how much contact area there will be between the Anaglypta (it will depend on the design / texture) and the back of the Insulating lining Paper. This will determine how well the adhesive can grip the surface (Anaglypta in this case).

      Another thing to consider is whether the Anaglypta is stuck to the wall well i.e. it’s not coming off at the seams / corners. If it’s coming off here and there the Thermal Liner Adhesive will loosen it further and could cause it to come off.


  5. A message for Frank C
    Tried to reply to your email, but it bounced so the answer to your question is:

    Q: Could you double the insulation properties of the thermal liner by putting a second liner on top of the first?

    A: You’d improve the insulation value by about 50%, but it’d not double with the second layer.



  6. Hi there – I was hoping to use my left-over Thermal Liner Adhesive for hanging my Fibre Liner lining paper. I think it should be fine – from what I’ve read the thermal adhesive is just a very high quality PTW adhesive (as it should be for the price in fairness) but the only reason I ask is that there’s also a specialised adhesive on sale specifically for hanging the Fibre Liner. So, was wondering if that separate Fibre Liner adhesive had any specific/necessary properties – for hanging the lining paper onto the thermal paper – that the Thermal Liner Adhesive lacks.

    • Hi Joe,

      You can use the thermal liner adhesive to hang Wallrock Fibreliners (and other paste the wall wallpapers). The main difference is that this adhesive it made much stronger to work with the thermal backing of the thermal liners. Wallrock Power Adhesive is there to be used if you aren’t buying the thermal liner adhesive meaning you won’t have any left. Hope this helps.


  7. Will wallrock thermal go around internal corners, is it flexible
    enough or will the surface crack?

    • OnWall

      Hi Rob,

      It wouldn’t crack as it’s flexible enough, but I don’t think you’d get a nice finish. I’d suggest you cut Wallrock Thermal Liner (especially if using KV600) and butt-join it. You can use normal filler to fill in any gaps.


  8. I want to put wallrock lining paper over wallrock kv600. Do i paste the kV600 and put the lining paper straight onto the kv600 or do i need to pre apply anything to the kv600 (eg “size” it) or anything?

    • Hi Bill,

      The steps to hang one of the Wallrock Fibreliners are:

      1. Paste Wallrock Power Adhesive onto KV600 Thermal Liner (no need to size it at all) – 1kg of the adhesive will cover +/- 5 to 6 m sq.
      2. Apply Wallrock Fibreliner (butt-joint each drop) – there’s no need to wait after you pasted an area you’ll cover and paste only the area you’ll cover with a single drop.
      3. Give it about 24 hrs to dry and you can paint. As we are in the winter season, I’d suggest that you keep the heating on low to moderate to allow for the adhesive to dry slowly.

      This should be pretty much it. If you have more questions, please let us know.



    • Hi thank you for your reply,

      i would also like to know when painting the lining paper after applying it on top of the KV600 do i need to apply a watered down coat of paint before applying the final coats of paints, as i have been told the surface will be be very absorbent, or can i just use a matt emulsion first and than go over with the final coats?

      if it needs to be watered down, how much water (the ratio of paint and water) should it be?

      thank you.

    • Hi Bill,

      Please don’t apply the traditional lining paper on top of the KV600 thermal liner unless you mean one of the paste-the-wall types. You could apply 800 grade lining paper, but anything above it could cause problems.

      As for your question: It’s not necessary to water down the first coat of paint and I don’t agree that the fibreliner is very absorbent. Paint as normal and two coats of good emulsion should do the job just fine.



  9. mark stokes-hughes

    Hi got mould patches on wall due to condenstation was thinking about using this product would it sort mould out also if it is knocked does it damage like graphite insulating lining paper and what is difference between graphite insulating lining paper and wallrock thermal liner

    • Hi Mark,

      It would help by raising the temperature in the room as well as by separating the warm air in the room from the cold wall, which is very often the cause of the mould developing in the first place. However, what you need to be conscious of is the ventilation in the room as well. Cold wall, ventilation and air temperature are the triangle of elements (simplistically put) affecting the mould.

      Graphite Insulating Lining Paper is made of polystyrene (Wallrock Thermal Liner is made entirely different and of different thermal material) and it doesn’t damage easily. Remember that you can always cut out the damaged area in the Thermal Liner and replace it – see how to replace damaged Wallrock Thermal Liner here.


  10. Pranshu Goel

    First of thanks for all the great feedback about the KV600 Thermal Liner.

    I am looking to do two bedrooms and got solid wall (cold and freezing in winter). I am planning to buy KV600 with Fibreliner Plus 100 Double Extra (V180) with relative adhesive for hanging these.

    I already got a problem wall where I am seeing condensation and mould forming. Can I put a damp proof paint after treatment on the wall first and then KV600 followed by fibre liner ??

    Any comments and help is really appreciated. Thanks a lot.

    • OnWall

      Hi Pranshu,

      You can apply the damp proofing paint and then KV600 Thermal Liner later, but please allow extra drying time for the paint before you apply the adhesive paste. What paint do you have in mind?


    • Pranshu Goel

      Thanks… it was quick 🙂
      I was planning to go for Polycell or Ronseal Damp Proof and anti mould paint. Do i need to choose different one ? is it required at all ?
      And the last question – Is the combination KV 600 and Fibre Liner Double v180 is good combination or do i need to choose a different liner and why? Thanks a lot again.

    • OnWall

      Both of them are well known and we’ve heard good and bad opinions about them (opinions aren’t always based on how good or bad the products are). Is an anti-mould paint required? They do help, but not in every condition. If you get rid of condensation you’ll remove the cause of the mould so sometimes treating the area with bleach and water or a specific product can be sufficient before you apply KV600. I’d say invest in a dehumidifier and use it in winter from time to time (especially when the washing is drying etc) and you’ll be in a much better place (drier air feels warmer as well!).

      KV600 thermal and Fibreliner Polus V180 is a great combination. V180 is my preferable finish – it’s in between the standard Fibreliner and the Premium in terms of the smoothness of the finish. I’ll paint well, too. If you need any samples, please shout.


    • Pranshu Goel

      Hello Onwall,

      Thanks for all your answers.
      I am back again with another question – if I paste a pre-pasted vinyl wallpaper(on top of KV600 + Fibre Liner Plus) on one of my wall. How easy and difficult it would be in future to remove the vinyl wallpaper keeping KV600 intact ??


    • OnWall

      Hi Pranshu,

      It wouldn’t an easy job but far from impossible. You’d need to use a wallpaper steamer to loosen the liners without loosening KV600 so it’d need to be a careful job. Hope this helps.


    • Pranshu Goel

      Thanks Onwall.

  11. mark stokes-hughes

    Thanks for info I am in process of fitting trickle vents to windows for ventilation do you think these would be sufficient or would you recommend a air brick to? Does the wallrock need lining paper after to or can you paint straight onto it? Also is the only difference between thewallrock and graphite insulating lining paper that the graphite damages easily or have they got different insulating values also does the graphite paper let the wall breath? Sorry for all questions and would appreciate any help thanks

    • Hi Mark,
      The ventilation and its size depends on the size of the room and other conditions such as overall humidity in the property. They typically do help though. You can paint wallrock thermal liner and we’d strongly advise against applying traditional lining paper on top of it – if you need to use another liner, please use one of Wallrock Fibrliners.

      Both graphite and wallrock are breathable. Both products perform differently in terms of the thermal insulation with Wallrock Thermal Liner delivering better results.

      Hope this helps.


  12. I want to apply blown vinyl wallpaper straight on to wallrock thermal liner is that ok and can I use the thermal liner adhesive I have left. Thanks Karen.

    • OnWall

      Hi Karen,
      It’d best if you applied Wallrock Fibreliner first and I’d suggest using Ready Mix wallpaper paste instead of the thermal liner adhesive.


  13. Thank you, You have been a great help.

  14. Hi, I’m about to apply wallrock KV600 to a room which has a matt emulsion on the walls and some mould stains. My question is should I sandpaper and wash the walls first? And can wallrock be put on the ceiling, it’s a flat roof I want to insulate from the inside?
    Thanks very much!

    • OnWall

      Hi Jim,

      There’s no need to sand down the walls before applying KV600 Thermal Liner, but it might be a good idea to treat / wash the mould stains. We’d suggest that you use 3.2 mm Wallrock Thermal Liner on a ceiling. KV600 is slightly too heavy and could cause difficulties when hanging it.


  15. Pranshu Goel

    Just wanna say big thanks – both of my bedroom came out really well and KV600 works like magic. I did my room sometime back in March and no problem since then – room stays warmer, walls look much nicer.

    overall a winner.

    Thanks Onwall.

    • OnWall

      Thanks, Pranshu. Really pleased to hear it worked so well. Judging by what’s going on in the market, a lot of people are planning and doing the thermal insulation work much earlier this year. I suppose nobody wants to leave it until the last minute.


  16. Anna Brown

    Hi I have just moved house The walls are in good condition (only 30 years old) but I am thinking of thermal lining on the outside walls The rooms are quite large and I won’t be able to afford lining them all Would this work? Should the ceilings be done or is it just better to do walls/ Sorry for the questions I am just looking for an economical way to do this Many thanks

    • Hi Anna,

      It’s best to do just the outside-facing walls with the Thermal Liner. This approach provides you with the best thermal insulation saving for the money you spend on the thermal liner. You can do the ceiling – warm air rises so if the ceiling is ‘leaky’ you’ll lose the heat there. Obviously, you’ll need to determine how well the space above the room(s) is insulated before you can make this call. Don’t use the KV600 thermal liner on the ceilings though. It’s too heavy.


  17. Hi, just wondering if KV600 can be used in kitchens, and also if the wall finish will suffer if the wall has shelves mounted on it afterwards (would there be visible depressions around the brackets?)

    Many thanks

    • OnWall

      Hi Dawn,

      Yes, it can be used in the kitchens as KV600 Thermal Liner deals well with increased moisture content. As for the shelves; although the thermal liner becomes quite sturdy after the adhesive has dried, I think the shelves could cause a dent after a while. I think it’d be best if we could send you a sample so that you could determine if it’d work for you.


  18. Hello. Apoologies in advance if i havent explained this properly.

    I have just moved into a maisonette but in the bedrooms, one of the walls is just uPVC (with window) from ceiling to floor.
    would it be possible to use the thermal liner on this type of wall? As when I have gas heating on it is freezing at the uPVC wall!!


    • OnWall

      Hi Chris,

      It sounds like you have uPVC panels on top of the wall – I could be wrong, but I don’t the entire wall would be made of uPVC. I feel that the adhesive wouldn’t be able to grip / bond with the uPVC material though unless you gave it a good going over with sandpaper. This would obviously create damage to the uPVC panels, which perhaps isn’t a good thing unless you are planning to get rid of them.


  19. Anne Devereux

    Some months back I used Wallrock Thermal Liner to do a cold outside wall at my daughter’s house.(made a fantastic and immediately noticeable difference to a cold room!) I had some problems with the joins showing and therefore filled them reasonably successfully.

    I intend to use the Thermal Liner in my kitchen as the walls have no cavity that can be insulated. I will use the fibre liner on top and would like to know if I should offset the joins so they are not in the same place as on the Thermal liner. Don’t want to do any filling if possible! Thanks!

    • OnWall

      Hi Anne,

      Glad the room feels much warmer! Yes, you can off set it by starting with Wallrock Fibreliner from the other side of the wall – most likely your thermal liner won’t finish with a full width drop.


  20. Richard

    If I paper over the Wallrock will I be able to remove that paper without damage to the Wallrock or will it all need replacing.

    • OnWall

      Hi Richard,

      Are you going to wallpaper using paste-the-wall type of wallpaper or traditional wallpaper? If the latter, please hang Wallrock Fibreliner on top of the thermal liner first. Removing wallpaper from the thermal liner wouldn’t be an easy job and would require a steamer, but it’s not impossible.


  21. Can I hang pictures without creating big depressions?

    • OnWall

      Hi Emma,

      You could, but you’d need to ensure that the hook / screw is fastened to the wall under the thermal liner.


  22. Hi,
    I hired a decorator to hang my wallrock thermal liner kv600. Unfortunately, it did not go so well. Immediately after he left it became obvious that the liner was coming off the wall at almost all of the seams. What’s more worrying is that there are very clearly some quite large bubbles underneath the liner as well (many at least 0.5m wide and quite long as well). It seems that the glue was not applied thickly enough or dried before the liner was stuck to the wall (walls were sized + PVAed before the liner was applied).

    The thing has not come off the wall as yet but I am worried that in might in due course – as well as creating cavities for the mold to grow…

    Do you have any advice on how to proceed? The decorator has the intention of sticking the seams back on with the reminder of the glue but I am worried about the bubbles under the liner. Should he strip it all and start from scratch? How would he do that? Any advice appreciated!

    • OnWall

      Hi Kaska,

      Firstly, using PVA was most likely a mistake. When PVA dries, it very often creates a crust-like layer, which can crack thus creating an unstable surface onto which the KV600 thermal liner is trying to hold. Hence the large bubbles / lifting in places. Not enough adhesive used could contribute to the issue – the decorator should’ve used about a minimum of 7kg of the Thermal Liner Adhesive per roll.

      Please get in touch with us through coveryourwall.co.uk if you’d like to discuss it in more detail.


  23. Alison

    I had a decorator hang my KV600 and it’s coming away from the wall around the window and on some of the seams. It was also covered with a blown vinyl wallpaper, then emulsioned – was this the wrong thing to do? Would I be able to take the blown vinyl off and use the correct paper? If I applied more of the adhesive to the areas where it’s coming loose, would that work?

    There is also a cupboard in the room which is freezing inside so I was going to use wallrock to line the inside of it. It has been what looks like gloss painted inside – would the wallrock stick to that? It’s also under a flight of stairs, so lots of strange shapes and a curved section – would wallrock go round the curved section OK?

    • OnWall

      Hi Alison,

      Blown vinyl could well be the problem – you should’ve used Wallrock Fibreliner on top of the KV600 first, but based on what you are describing, there was not enough adhesive used. The decorator should’ve used a minimum of 7kg of the Thermal Liner Adhesive per roll of KV600. You can try to patch it up with more adhesive and see if this works. If it doesn’t, then you can try to use a wallpaper steamer to loosen up the blown vinyl and peel it off. It’s going to be a gentle and measured job though so that you don’t damage the KV600 thermal liner underneath.

      For the gloss paint, you will need to scuff the surface with sandpaper and perhaps give the surface two coats of adhesive (the first one thin and let it dry for 15 minutes before going on with a thick layer of the adhesive paste).

      It depends on the curve. If it’s gentle yes, if it’s sharp, it might not. Try it whilst dry first and see how it behaves.


  24. Elliot

    Our attic room has plasterboard walls and wall paper on the ceiling, which having had a go at it with a scraper appears to want to stay on the ceiling… I’m wondering if wallrock thermal liner would work and be able to be applied directly onto this wallpaper.

    We are hoping for a cosy, white finish… should we paper over wallrock to achieve this?

    • OnWall

      Hi Elliot,

      You can use Wallrock Thermal Liner or Cosy Liner KV300 (this one is 1mm thick vs 3.2 mm on the Thermal Liner). If the wallpaper is properly stuck to the ceiling, which it sounds it is, you can hang the thermal liner over it. To determine if it’s going to cover everything well, I’d suggest you request a sample(s) here on on coveryourwall.co.uk.


  25. Christopher Simons


    I have jut put up this thermal kv600 ,all went well but i was thinking
    if i hung ordinary wallpaper on this then in about 5 year time i may want to strip that wallpaper for a new paper how much damage would this do to the kv600 ?

    • OnWall

      Hi Chris,

      If you want to put traditional wallpaper on top of KV600 you need to hang Wallrock Fibreliner on top of KV600 first. I’m sure you’ve read about the reasons why. In this case Wallrock Fibreliner would protect the KV600 in 5 years’ time when you want to take off the wallpaper. It’s still be a delicate operation, but you can do it (wallpaper steamer needed).


  26. Tracey Osborne

    I have condensation on my outside walls, so been advised to put up Wallrock thermal paper..
    The walls are one papered , and one painted at the moment. Would I have to remove the existing paper first? I want to re-paper one wall, and re-paint the other wall after applying Wallrock Thermal paper..so please advise what to do. Also would I have to put a lining paper on, before re-papering and painting.

    • OnWall

      Hi Tracey,

      Ideally, you should always remove wallpaper before hanging another wallcovering. If this isn’t possible / not part of the plan you should ensure that the wallpaper is firmly stuck to the wall and it’s not lifting off at the seams and corners. If it does, you’ll have to remove it – this can be the case due to condensation. Once you’ve either taken the wallpaper off or decided to leave it, you can then hang Wallrock Thermal Liner. As for the other wall, you can hang normal Wallrock Fibreliner to get a similar finish on both walls or even hang Wallrock Fibreliner Premium or Plus on both walls if you’d like a smoother finish. If you need any samples, please let us know.


  27. Hi, am thinking of using Wallrock thermal paper in a small bedroom with two outside single skin walls. The corner of the room has mould stains currently, do I need to treat this with anything before hanging the thermal paper?
    Thank you

    • OnWall

      Yes, it’d be advisable to buy ready mixed solution for treating mould, or just use bleach mixed with water if the issue isn’t too extreme.



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