Erfurt MAV - FAQ About Fire Rated Materials How do I find out the fire rating and what do the letters and numbers mean? The fire rating system in regard to wallpapers can be difficult to understand and obviously for absolute accuracy and certainty you should always consult an expert in the field such as a Specifier, Trade Body or Testing Body. What I am providing here is my personal overview of how to look at fire ratings and what they may mean for you. Whilst the last thing I want to do is give a false sense of security or give the impression the fire rating of your wallpaper is not very important - it is worth bearing in mind that having properly maintained and positioned smoke detectors in your home is arguably far more important than the fire rating of your wallcovering because we all inevitably have lots of other combustible and smoke generating products in our home. Click here to read the full article I need to line a wall above an insert wood burning fire. Which smooth finish product would you recommend? The standard Wallrock Fibreliner will be fine for this application - it is fire rated B. Wallrock Fibreliner Original 150 I have a newly skimmed wall that has a hair-line crack. Will Wallrock Fibreliner Original 150 be a good choice to cover this? Wallrock Fibreliner Original 150 would be great choice to cover this problem: it is made from paper and polyester fibres, so it is very strong, and covers these cracks very well. Wallrock Fibreliner Original 150 will also reduce the chance of the crack reappearing as they both move with your wall, reinforcing the surface. We produce Wallrock Fibreliner Original 150 at 55cm, 75cm and 100cm widths – the difference is quite simply the width of the roll. As the products are all the exact same material, they can be used next to one another and you can choose the right size for a particular wall. I have some Wallrock Thermal Liner Adhesive left over, can I use this to hang Wallrock Fibreliner 150 or should I use a different adhesive? We recommend Wallrock Power adhesive, or a similar quality red top tub adhesive; you will find that many adhesives tubs are graded in performance by colour: yellow top adhesive tubs tend to be used for light to medium weight wall coverings, red top tubs for mid to heavy weight wallcoverings and finally blue top tubs for heavy weight wall coverings and Insulation based wall coverings.Wallrock Thermal Adhesive has extra binding agents and fillers in the adhesive to handle the extra weight of Thermally efficient wall coverings making WTA much thicker than our Wallrock Power Adhesive. Thermal Adhesive can be used to hang Fibreliner if the adhesive is applied very evenly and carefully to the wall, if the adhesive is applied unevenly there is a risk that the adhesive may dry lumpy and you will be able to see these lumps through the paper once dry.Lastly make sure the adhesive is still good to go, it should smell relatively neutral and be white in colour, if the adhesive has become grey or brown in colour and smells bad it is unfortunately no good for use. Wallrock Fibreliner Plus 180 Do I need to size my wall before hanging Wallrock Fibreliner Plus 180? We always recommend that walls are sized (where necessary); you can check to see if you need to size, by flicking water onto the wall surface: if the water runs down your wall, there is no need to size; however, if the water soaks in, then sizing is necessary. There are many sizes available on the market, and we would recommend that you follow the manufacturer’s instructions very carefully. Wallrock Thermal Liner Is it possible to bend Wallrock Thermal Liner around corners, also what is the best way to cut this product? We wouldn’t recommend trying to bend the thermal liner round corners, this is because the product is around 3 mm thick and very strong. Always cut the product into corners using a good quality sharp knife or sharp scissors; when making vertical cuts, mark the liner accurately with a decorators pencil and cut with a saw like motion, this will help you to maintain accurate straight cuts; alternatively, good quality sharp decorators scissors can be used to good effect and many people feel like they have more control and confidence, although it is very important to mark the liner correctly to avoid excessive cutting - it’s always better to cut away too little than too much. I put up Wallrock Thermal Liner and I’m still getting patches of mould appearing – Why? Wallrock Thermal Liner ‘combats’ mould by alleviating the moist conditions which mould spores need to grow – namely condensation. How? By trapping warm room air at the wall surface and evening out any dramatic differences between the wall and air temperature. A good way to think of this is similar to how condensation forms on the outside of a glass of cool drink on a summer's day. So if you are using this product to help combat mould, it is important to remember that damp and subsequent mould problems can also be caused by penetrating damp from outside or in ground floor rooms by rising damp. As a general rule, condensation problems such as mould often manifest themselves in the coldest parts of a room such as in corners and window reveals. So a mould problem in the middle of a wall would most likely be caused by penetrating damp. As such, damp that is only low down on ground floor walls (approx 1 meter or less) may well be rising damp. Penetrating damp problems are best dealt with at source, by fixing the cause – similarly with rising damp too. Localised problems, however, can be dealt with by applying a damp barrier behind the thermal liner; these are available as specialist paints and in roll form i.e Anderton 3 in 1 Damp Foil. However, you should always remember that these products only mask the underlying problem and stop the wall breathing - expert advice is always well worth sorting out if you have any doubt. I have some really bad textured walls in my house and Thermal liner will be a good way to get back to flat walls as well as making the room more comfortable and saving energy in the longer term. Do I need to take special precautions when applying Thermal liner over such poor surfaces? Not really, just make sure the walls are clean dry and solid. If the texture is very deep, as with some decorative plaster effects, it is advisable to sand down the high points and use extra adhesive to help level the surface. Before sanding or scraping any textured surfaces, we always recommend that you check to make sure they do not contain asbestos or other harmful substances. Stand back and take a good look after hanging the first drop to make sure the result is satisfactory.