Insulating Lining Paper
Or simply, 4 mm of polystyrene, which has been lined with 1200 grade lining paper. Yes, this means that the lining paper is already glued on top of the polystyrene at the factory and all you need to do is put it up on the wall and either paint it or use a wallpaper of your choosing on top of it. Of course, you can purchase polystyrene in rolls and lining paper separately, but this means you’ll have put the polystyrene on the wall first and then line it with lining paper. Twice the time and twice the risk.
Below is an image, which I’m hoping will give you a good idea about the thickness of the Insulating Lining Paper. The thickness of any wallcoverings is quite important as it will have bearing on the approach you need to take when working around the fittings such as light switches etc.
You have to use a solvent free adhesive such as Wallrock Thermal Liner Adhesive. If you think you’d be saving yourself a few quid by using something else perhaps you need to rethink the whole job. Whilst I understand that everyone wants to get the job done as cost effectively as possible, you won’t be doing it when the Insulating Lining Paper starts coming off here and there and you have to start again.
The manufacturer claims that 4 mm polystyrene has the same insulation effect as an 85 mm brick, 98 mm sandstone block and 262 mm concrete. We all know that polystyrene has been used as a insulating material for decades and it works.
Which way is up?
I think the image below explains everything you need to know when hanging the wallcovering on a wall. As with most wallcoverings, allow 24 hrs drying time. This will give you the time to spot any problems and fix them. Once you feel happy with the result you can emulsion paint it or use a wallpaper on top of it.
A small issue with using polystyrene backed wallcoverings is that once you dent the polystyrene it stays that way i.e. it won’t come back up to flat level. There’s no need to panic though. It’s not going to happen by just touching it. The dent below was made using a pencil and I had to apply a fair bit of pressure. Should it happen, just fill it in with a good quality filler.