Finish on Wallrock Thermal Liner

Finish on Wallrock Thermal Liner

One of the most often asked questions when it comes to Wallrock Thermal Liner is ‘what else do I need to put on top of it’? This question relates to what the type of surface finish you’ll get at the end of the process. There are a number of options and we’ll explore them in this post.


1. Paint it

Wallrock Thermal Liner has a smooth side, which is ready to be painted. So, if you have achieved flat surface with Wallrock Thermal Liner and you are satisfied with it you can paint it. Once you have put Wallrock Thermal Liner up on the wall you do need to leave it for at least 24 hrs to dry before painting.


2. Use Wallrock wallcoverings

Why would you use anything else on top of the Thermal Liner if you can paint it? As Wallrock Thermal Liner is 3.2 mm thick and if your wall isn’t perfectly flat you might get step-like differences between each drop. Most likely it will be tiny, but to a lot of people that’s not acceptable and they would like a flat surface. By overlaying the thermal liner with e.g. Wallrock Fibreliner, Wallrock Premium, Wallrock Trend textured paintable wallpapers (or even Paste the Wall Lining Paper) you can hide most of them. If you aren’t sure what these products are and what they look like get a free sample. Just drop us line.

If you don’t want to overlay the thermal liner with anything else quality filler very often does a good job of masking any problem areas.

3. Use Paste the Wall wallpapers

There are a number of printed wallpapers in the market that you might like and they are fine to use as long as they are paste-the-wall (sometimes called non-woven) wallcoverings.


Why you shouldn’t use normal lining paper or wallpaper

Lining paper or traditional wallpaper expands when wet and tries to shrink when drying. We call it dimensionally unstable. Wallrock Thermal Liner is dimensionally stable though. So, as lining paper or wallpaper is trying to shrink whilst on top of the thermal liner it can pull the corners of the thermal liner off of the wall. We don’t realise it, but the force exerted by the drying wallcovering is capable of it. That’s why you very often get gaps when hanging lining paper. You don’t get this when using Wallrock products as they are all dimensionally stable.




  1. agnes kerr


    I have an issue with cold spot mould in the upper corner wall and slanted ceiling which is directly exposed to the outside elements. It is currently covered in embossed wallpaper which was painted with anti mould paint but it seems to be worse this year. I’ve found the insulated lining papers via internet searches and would like some advise on suitability for the ceiling. What would be the best option for covering the ceiling, is it safe to be in close proximity of lights and can it be painted after with anti condensation paint or similar for added protection? Any advise greatly appreciated

    • OnWall

      Hi Agnes,

      Are you able to determine if the wet spot is a result of condensation or there’s moisture getting in from the outside? It’s critical to the solution you’ll end up using. If you don’t have LEDs and the lights get very hot I wouldn’t consider using Graphite or Red Label Insulating Lining Paper. It’s not so much because of fire risk, but because polystyrene will deform over time. Wallrock Thermal Liner would be a much better liner to use – don’t use KV600 thermal liner on a ceiling though. It can be painted with anti condensation paint, but not sure if it’s needed as that’s the job the thermal liner would be doing. If these paints worked you’d not need any thermal liners.


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