Underfloor Foil Insulation

  • 3 IN 1 DESIGN
    High-Performance Insulation, Radiant Barrier & Vapour Control Layer 
    Suitable For All Underfloor Heating Types
    No Specialist Tools Required
    Ideal for New Build & Retrofit - Roofs, Walls & Floors
    Whether Used on its Own or in Combination With Other Insulation Types

SFUF, The Perfect Choice For When Space Matters...

Our under floor insulation solutions have been specially designed with solid floors in mind. SFUF has a built-in protective layer, meaning you can put screed directly on top of the product without worrying about causing damage to the insulation. This makes it an excellent addition to that new underfloor heating system that you are installing!

SuperFOIL’s underfloor insulation is extremely thin, measuring a grand total of 6mm in thickness! Despite its sleek appearance, SFUF still delivers the high thermal performance that SuperFOIL is known for. Making it the perfect solution for installations where floor depth is limited.

SFUF is slightly different from our other ranges. Due to the materials used, it is typically installed with the use of no air gaps and has minimal compression. However, that is where the differences end! Our underfloor range remains easy to install with minimal wastage, whilst still providing you a certified 3 in 1 product.

SFUF can be used all around the home! Not only in your flooring applications but also as wall insulation and roof applications! It can be used either as a lone product or in combination with other traditional types of insulation. This means that you will always achieve your target U-value!

SuperFOIL is easy to install and requires no specialist tools for fitting. Due to its clever design, you will have minimal wastage, unlike more traditional types of insulation. Our full range is made from 40% recycled materials and is fully recyclable at the end of its 50+ year lifespan.

SuperFOIL Will Save You
Space, Time & Money

SFUF SuperFOIL Insulation
SuperFOIL Basement Conversion

Save Time & Money By Choosing The Right Insulation For The Job!

SuperFOIL Insulation



  • 0.8 R Value
    When used in a roof wall or floor
  • 6mm Thick
    1.5m Wide by 8m Long

Technical Information

Click a section on the left to expand and view full tech specs.
Can't find what you need? Email us: [email protected]

Core Performance0.8 R Value
Reaction To Fire (Euroclass)Class E (Behind Plasterboard)
Water Vapour Resistance1200MNs/g
Resistance To Water PenetrationW1
Tensile Properties (Length)705 / 635 N/50mm
Tensile Properties (Width)610 / 580 N/50mm
Resistance to Tearing (Length)428N
Resistance to Tearing (Width)453N
Elongation (Length)26 / 16%
Elongation (Width)28 / 17%
Flexibility at Low Temp.-40°C
Reinforced Heavy Duty Double Laminated Foil2
Aluminium Coated Reflective Foil PET Layers4
Thermo Foam Separation Layers6
Polyethylene protective layer1
Total Layers13




Person Measuring Floor With Pencil

SFUF is the solution for solid floor projects. Measuring at just 6mm it gives a core R value of 0.8.  Unlike our multifoil products, SFUF does not contain wadding layers within its build up, which allows for less compression within a solid floor application.

The top layer of SFUF is made from a polythene membrane, this is so that screed can be applied directly to the product without causing any damage to the insulation. It is also ideal for use with either electric or water based underfloor heating systems.

SFUF is easy to install, and is designed to be installed in a continuous layer. It is simple and quick to cut and fit into place. When using SFUF as a lone product with an underfloor heating system, we recommend to use clip rail fittings when laying your UFH pipes.  If you are using SFUF in combination with other insulation products (such as PIR), then pipe can be layed using typical pipe clips, placed through the SFUF and into the foam board.


Other Applications

Although designed with flooring applications in mind, SFUF is a highly versatile product!

It can be used in walls, roofs or any project that has limited space but needs high-performance insulation. SFUF can help with thermal bridging issues, making a project airtight and reducing outside noise.

SuperFOIL Under Floor Install Diagram

Complies with all relevant UK building regulations

Copy of Building Regulations 2010
HM Government Logo

All SuperFOIL Insulation products are independently tested by notified bodies and 3rd party certified laboratories to comply with relevant UK building regulations for use as part of construction and European regulations such as CE/UKCA.

We are also part of the Quality Mark Protection scheme and the IAA, meaning you are protected when using SuperFOIL Insulation in your project.

SuperFOIL can be used in many different situations to meet or exceed the requirements of Building Regulations for virtually any project, we can also provide U-value calculations (free of charge) for elemental or SAP assessment methods.

Here at SuperFOIL insulation, we are committed to increasing our sustainability in all our processes.

We have a new, high-tech production line in our warehouse allowing us to keep up with demand using UK manufacturing.
On top of this, our products are made from up to 40% recycled materials, namely recycled plastic drinking bottles which go into the wadding used in our insulation products helping to reduce the amount of new, raw materials being made.

We are significantly reducing the amount of plastic used in retail packaging as part of our waste management protocols, reducing the amount of waste going to landfill from our products as well as our warehouse and offices.

U Value

Technical Information

Click a section on the left to expand and view downloads.
Can't find what you need? Email us: [email protected]