Frequently Asked Questions 

Click on a question for more information 
Radflek is an innovative radiator reflector that is made from a laminated aluminium foil with a unique long lasting coating that preserves its high reflectivity. 
Radflek will help you save energy, cut your heating bills and reduce your carbon footprint. 
Radiators send out heat in all directions. When positioned against a wall, as much as 40% of the heat released by a radiator will be directed towards the wall. A Radflek sheet placed between the radiator and the wall will reduce the amount of heat being wasted in heating the wall by reflecting at least 95% of that heat back into the room. This means less energy is needed to heat the room to the required temperature. 
Radflek has been independently tested by the BBA (British Board of Agrément) and the test data verified by the BRE (Building Research Establishment). Radflek is one of the most efficient radiator reflector available on the market. 
Kitchen foil is far less efficient than Radflek as a reflective surface. Aluminium foil is manufactured from rolled aluminium, which when unrolled has a high reflectivity (normally towards the high end of the 80% to 90% range). All aluminium exposed to the atmosphere has a thin layer of aluminium oxide on its surface. Aluminium oxide is porous and very quickly becomes contaminated by atmospheric pollution and water vapour. This contamination soon dulls the initial bright appearance of aluminium foil and, once it becomes dull from atmospheric contamination, that reflectivity is materially reduced. In contrast to kitchen foil, Radflek has a special coating that maintains its initial greater than 95% reflectivity for a lifetime of at least 60 years, as certified by the BBA (British Board of Agrément). As well as having no such coating, kitchen foil is considerably more flimsy as it is not laminated like Radflek (which has a 250kg burst strength). 
Radflek is made from a material used in the building industry, which is a laminated aluminium foil with a unique long lasting coating. It is made from seven layers, a special coating, then a layer of aluminium foil, then an adhesive then a polyethylene core, then another layer of adhesive, then an aluminised sheet of polyester and then a final special coating. 
Yes - occasional cleaning with a damp cloth to remove the dust will keep Radflek working as good as new and reducing heating bills year after year. 
A Radflek sheet has been certified by the BBA (British Board of Agrément) to have a life of at least 60 years. 
Where Radflek is installed on external walls, independent tests have shown that it helps reduce heat leaking through the wall into the outside environment and being wasted. Putting Radflek on internal walls will have the same effect where the temperature of the space the other side of the internal wall is low (e.g. a hallway which is not kept at the same higher temperature or the next door property in a terrace). Customers have also reported that installing Radflek on internal walls seems to bring the room to operating temperature more quickly. 
Radflek has been tested by the BBA (British Board of Agrément) and the findings verified by the BRE (Building Research Establishment). The findings show that Radflek is one of the most efficient radiator reflector on the market. It's special laminate coating ensures that it will maintain a high level of reflectivity for up to 60 years. 
Radflek is only available to buy online via our web shop or other online retailers. 
It depends on the wall, the heating energy source and how often you run your heating, but Radflek can pay for itself in about a year. 
Radflek is easy to install – anyone can do it and it takes only minutes. The standard installation method is for Radflek to be suspended from clips that hang between the radiator wall brackets – no need to remove radiators or to use sticky pads or professional help. 
Yes - we advise that you put sticky back hooks on the wall (we sell these on our website, but you can buy them from any DIY retailer). Radflek can then be installed using the standard installation method but hung from the hooks rather than the wall brackets. 
Radflek is easy to install on curved radiators, as the foil is flexible enough to bend around the curve of the radiator. Measure the distance between each wall bracket and hang from the brackets as with standard installation. You may need to cut the clips to shorter lengths with scissors to make this easier. 
Yes, even though a window sill or shelf is closely fitted above a radiator, Radflek can be still be installed as the foil is flexible enough to bend over the top of the radiator and then slide down behind it in the standard installation method. 
For Radflek to work at its most efficient, it needs to have an air gap both between it and the radiator (so that it can reflect heat) and between it and the wall (so that it does not conduct heat). If the installed sheet does touch the wall or the radiator in a few places, that will not make any material difference to its effectiveness. The optimum air gap is approximately 25mm but we have had customer reports where Radflek has been installed in air gaps of 10mm and was still said to be effective. You may need to use the alternative method of installation for narrow air gaps (as the clips with Radflek rolled around them may be too wide for the gap) - see the answer to question (What do I do if the standard installation method means that Radflek doesn’t cover my entire radiator?). If your brackets are close to the top of your radiator, leave material above the slits but roll this material so that it does not protrude above the top of the radiator. 
The standard installation method is for Radflek to be suspended from clips that hang between the radiator wall brackets. We recognise that this means that the portion of the radiator outside the brackets will still be transferring heat into the section of the wall directly behind it but took the view that consumers would prefer a slightly less efficient installation if the Radflek sheet was not visible from the side of the radiator. If your brackets are unusually close together (and therefore far from the edges of the radiator) or low (and so not near the top of the radiator), you can modify the installation method by discarding the clips, cutting slits in the Radflek sheet and mounting it so that the radiator brackets sit in the slits. The sheet is stiff enough to bear its own weight, and you can leave sufficient material above the slits to ensure that any space above low brackets is also covered by Radflek. That way you can have Radflek behind the entire radiator. 
Where your radiator has brackets wider than 120cm apart but with an intermediate support, you should hang an appropriately sized sheet on each side of such support. Where there is no intermediate support, you can EITHER create an intermediate support (e.g.using a hook such as our Radhooks) and then hanging an appropriately sized sheet on each side of such support OR use the self-adhesive reflective foil tape, Radstik, to join additional material to a standard sheet to create the required wider sheet. Radstik is included in the pack or may be purchased separately through our website in the shop priced at £4.99 for a pack of 5 strips Radhooks are also available on our website in the shop priced at £4.99 for a pack of 10 hooks. 
Radstik can be used to enlarge a Radflek sheet or to combine off cuts. To fit, place two sheets side by side, with the printed side down. Stick Radstik onto the unprinted side over the join. Do not use to stick Radflek to the wall or radiators. 
If there is a gap between the electric radiator or night storage heater and the wall and if the electric radiator or night storage heater radiates heat towards the wall as well as into the room, then Radflek can be installed behind the electric radiator or night storage heater in order to reduce heat loss though that wall. Sometimes wall mounted electric radiators have brackets which are level with or even higher than the top of the radiator. In these cases, neither the standard nor the slit installation method explained in the answer to question 18 will work. A possible solution is put sticky backed Radhooks on the wall below the level of the high brackets. Radflek can then be installed using the standard installation method but suspended from the hooks rather than the wall brackets. 
Radflek does not need to be perfectly flat for it to be effective. All you need to do is unfold the sheet on a flat surface such as a table and run your thumb along each fold with moderate pressure and then turn the sheet over and repeat the process from the other side. The sheet should then be flat enough to be cut to size and installed. 
Each sheet of Radflek is 120cm x 60cm or about 4ft by 2ft and sufficient for up to two radiators.The thickness of a Radflek sheet is 125 microns. 
A standard sheet of Radflek measures 120cm x 60cm or about 4ft by 2ft. Pack sizes act as a guide only and the number of radiators covered will depend upon the size of your radiators. You will need to measure up prior to purchase to ensure that you order the correct pack size. To work out how much you need (assuming your radiators are a standard drop of about 60cm or 2ft) Measure the distance between the brackets of all your radiators, add the measurements all together and then divide by 120cm or 48 inches. This will give you the number of sheets you require. 
Yes Radflek is very easy to cut with scissors but will not tear. 
No - Radflek has enough rigidity because of its laminate construction and will not flutter 
Yes, Radflek offcuts can be recycled (with other metals waste), although whether this actually happens will depend on how your local authority treats recycled waste. 
Currently we only take orders for shipment within the United Kingdom. Our international distributor list is available on our shop page. If your country is not on the list you can try 
We offer a standard delivery service which goes via Royal Mail 48 packet post and costs £1.99 (this service should take 3-5 working days from dispatch). This service is NOT a tracked service. We are sorry, but we are unable to offer a tracked service. 
Delivery is charged per item. This is because our factory is unable to manage bundle orders. 
Our Standard and Express delivery services use Royal Mail parcel post services with no ability to give specific delivery instructions. A Radflek pack will, in most cases, fit through a standard sized letter box that accepts A4 sized envelopes. 
All items are sent out by Royal Mail parcel post. This is not a tracked service which means that, once we have handed it over to Royal Mail, we have no means of checking its progress. The standard delivery service normally takes 3 to 5 days after posting, but this may be longer, particularly in the run up to Christmas. Royal Mail does not consider an item lost unless it fails to be delivered within 14 days of posting. If you have not received your item by last post on such date, please contact our Customer Services via telephone on 0117 982 8808 or email us at, quoting your order number and we will arrange for a replacement to be dispatched straight away. Please note that, if the delivery failure is due to an incorrect or invalid address input by yourself through our web shop, Radflek will not send a replacement pack. 
We only sell Radflek in folded sheets to retail customers. The folded sheet format allows us to package Radflek in A4 size envelopes which will fit though most letterboxes and so can be delivered even if there is no one at the delivery address. 
For commercial customers, we do sell Radflek in rolls measuring 96m by 0.6m. Please go to for more information on this format. 
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