Frequently Asked Questions 

How does SuperFOIL compare to other foil insulation?


SuperFOIL has the highest performance multifoil insulation product of any multilayer foil insulation in the UK and EU. SuperFOIL has the largest range of multilayer foil insulation in the UK and EU including leading edge products such as SFUF, SF19, SF40, SF60. You may request a sample here

SuperFOIL is tested and certified

SuperFOIL has been tested to BS EN ISO 12667, ISO 8301 by BBA, ( British Board of Agre’ment) a UKAS certified and internationally accredited laboratory. SuperFOIL can be used in many different ways to meet the requirements of Building Regulations for your particular project , we can provide accredited 3rd party U value calculations by SAP qualified professionals. 

BR443 & Part ‘L’ of Building Regulations for Foil Insulation requires tests using a conventional test method. BR443 gives guidance re the performance of materials and calculations of U values. 

Conduction and convection affect energy loss, and insulation has been developed to reduce losses from conduction and convention. The third factor affecting energy loss is radiated energy. Energy from the sun is radiated energy. SuperFOIL is an effective radiant barrier reducing solar gain in summer and improving insulation in winter.

Air Tightness

Air tightness and other naturally occurring phenomena effecting insulation performance, such as drafts and dust. SuperFOIL provides an airtight barrier that other insulations may not and as such contributes to a higher overall performance.

What is the minimum insulation standard I need to achieve?

Your building control officer will advise what U-value you need to achieve. As an example, to achieve the current UK building regulations for a new build with a ‘room in a roof’, you will normally require a U-value of 0.18. Other constructions may require a lower U-value, for example flat roof and insulation at ceiling level usually require a lower U-value of 0.16. The quantity of insulation required is dependant on the U-value to be achieved and the type of construction. To reach an U-value of 0.18 you will require insulation to an ‘R’ value of 5.5.

Note: ‘R’ value is the measure of thermal resistance in a given material. The higher the ‘R’ value the better. ‘U’ value is the measure of thermal conductance on an entire structure (eg Roof). The lower the U-value the better.

Can SuperFOIL be used with other insulation products?

SuperFoil products are compatible with all other insulations for improving
your existing insulation, or as part of new build insulation composite.

What is radiant heat transfer and why does it matter?

Radiant heat is energy like that from the sun. It has no temperature as it travels through space, however when this energy strikes an object, it is absorbed and increases the temperature of that object. The object emits this energy causing heat loss or heat gain.

Up to 75% of the heat transfer in your building envelope is in radiant heat energy. Reducing heat gain and heat loss due to radiant heat using reflective insulation can dramatically increase your comfort and reduce your energy cost.

Do other forms of insulation prevent radiant heat transfer?

Mineral glass, chemical rigid foam and polystyrene all slow down various forms of heat transfer, but they have very low reflective ratings yet very high emissivity ratings. No other form of insulation prevents radiant heat transfer as well as multifoil. This is the reason multifoil’s were invented for the space missions.

Why install SuperFOIL insulation with an air space?

An air space allows heat to be converted into radiant energy. Installing reflective insulation adjacent to an air space allows this radiant energy to be reflected away from the building envelope useful in summer and in the hot sunny days, or kept indoors useful in the winter and at night.

Where can I install SuperFOIL insulation?

SuperFOIL products can be installed over or under rafters, in walls and under floors its properties are always at work regardless of position.

What’s the difference between radiant barriers and reflective insulation?

All SuperFOIL insulation provides a high performance radiant barrier. Radiant barriers combined with air spaces improve the insulation performance of air spaces. Multi layer foil radiant barriers combined with loft material and thermo foam separation layers generate the highest possible performance insulation and are usually classed as multi layer foil reflective insulation such as SF19 & SF40.

How does condensation effect reflective insulation?

Humidity has little affect on the performance of multi layer foils.

The performance of bulk insulation like glass fibre reduces by up to 35% in humid conditions. The average moisture content in homes typically exceeds 1.5%. SF19 and SF40 are particularly suited to perform in all variations caused by weather.

Can reflective insulation be added to my existing insulation

Yes it can, SuperFOIL can be used in conjunction with all forms of insulation to create a highly energy efficient insulation combination. Called ‘Super Insulated’ when combined together to achieve a high performance insulating layer of all 3, convection, conduction and radiation, can substantially help reduce energy costs.

Please contact us if you have any questions or email