SuperFOIL SF6 Multifoil Insulation – Slim 3-in-1 Internal Insulation

SuperFOIL SF6 is a slim, multi-functional insulation designed for internal applications where space, simplicity, and efficiency matter. With a thickness of just 30 mm, SF6 combines thermal insulation, a radiant barrier, and a vapour control layer (VCL) in one lightweight, easy-to-install system.

It is ideal for roofs, walls, and floors in new builds, retrofits, extensions, and DIY projects, including specialist applications such as lofts, room-in-roof conversions, caravans, campervans, and boats.

This is a vapour-closed multifoil insulation with an integrated vapour control layer (VCL), designed for internal applications where airtightness and condensation control are required.

Comparable performance ratios for SuperFOIL insulation products vary according to product thickness and construction build-up. For thinner systems, such as SF6, equivalent thermal performance must be assessed using the official SuperFOIL U-Value Calculator for the specific application.

As a reference within the SuperFOIL range, internal comparative assessments indicate that 65 mm of SuperFOIL SF40 can achieve thermal performance comparable to up to 450 mm of traditional mineral wool insulation (λ = 0.040 W/mK), depending on installation method, air gaps, and overall system design. These values are provided for indicative comparison purposes only. Final thermal performance must always be verified using the official SuperFOIL U-Value calculation for the specific construction build-up, supported by the certified R-Values of each product.

Product Dimensions & Coverage

• Thickness: 30 mm

• Length: 10 m

• Width: 1.2 m

• Coverage: 12 m² per roll

• Weight: approx. 5.5 kg

3-in-1 Multifunctional Design

SuperFOIL SF6 combines three essential functions in one product:

• Thermal insulation to reduce heat loss

• Radiant barrier to reflect heat back into the building in winter and reduce solar heat gain in summer

• Integrated vapour control layer (VCL) eliminating the need for a separate vapour barrier

This design simplifies construction, reduces material layers, and enables efficient thermal performance within a very slim build-up.

Thermal Performance

SF6 works across all three modes of heat transfer — conduction, convection, and radiation — unlike traditional insulation materials that primarily address conduction.

Certified thermal performance (core value + air spaces, EN 16012):

• Core R-Value: 0.99 m²K/W

• Roof (incl. air spaces): 1.90 m²K/W

• Wall (incl. air spaces): 2.32 m²K/W

• Floor (incl. air spaces): 3.65 m²K/W

• Emittance: 0.05

Thanks to its reflective foil layers and integrated air spaces, SF6 delivers effective thermal performance in applications where thicker traditional insulation is not practical.

What does R-Value mean?

R-Value (m²K/W) measures a material’s resistance to heat flow.
The higher the R-Value, the better the insulation performance.

What does Emittance mean?

Emittance measures how much heat a surface emits (radiates).

A low emittance value (typically around 0.05) means very low heat emission and high reflection of radiant heat, improving overall thermal performance when installed with adjacent air spaces.

This interpretation is aligned with EN 16012 and reflects how reflective multifoil insulation performance is evaluated across EU technical documentation.

Performance vs Traditional Insulation

Due to its reflective multi-layer construction, SuperFOIL SF6 can achieve U-values typically associated with much thicker conventional insulation systems, depending on the overall build-up and air space configuration.

This makes SF6 an ideal solution where space is limited, allowing designers and installers to improve thermal performance without significantly increasing wall, roof, or floor thickness.

Exact U-values depend on the complete construction. Bespoke U-value calculations are available.

Key Benefits

• Ultra-slim profile – only 30 mm thick

• Replaces insulation, vapour control layer, and radiant barrier

• Easy to cut, staple, and seal – no specialist tools required

• Lightweight and flexible for fast installation

• Suitable for new builds, retrofits, and DIY projects

• Can be used in standalone or hybrid insulation systems

• Minimal waste compared to rigid insulation boards

• Made from up to 40% recycled materials

• Fully recyclable with a service life of 50+ years

Applications

SuperFOIL SF6 is suitable for:

• Roof, wall, and floor structures

• Internal insulation and dry-lining systems

• Lofts, conversions, and extensions

• Timber-frame and solid constructions

• Boats, caravans, and campervans

Typically installed on the internal side of the building envelope.

Fire & Safety Performance

• Reaction to Fire (Euroclass): Class F

• Water penetration: W1

• Flexibility at low temperature: –40 °C

• Water vapour transmission: Pass

SF6 - Quality & Certification

• Manufactured under a certified ISO 9001:2015 quality management system

• CE certified to EN 13984:2013 for vapour control performance

• Tested to meet current UK and EU building regulations when installed correctly

• Designed, tested, and supported by SuperFOIL technical specialists

• Independently tested and assessed as part of the SuperFOIL multifoil insulation range, including
  BBA testing (British Board of Agrément – independent product and system performance assessment)
  and LABC certification (Local Authority Building Control – approval for compliance with building regulations)
  at range level

Why Choose SuperFOIL SF6?

SF6 is widely specified for projects requiring minimal build-up depth, fast installation, and reliable vapour control. It is particularly effective in refurbishments, conversions, and specialist applications where traditional insulation thickness is not feasible.

Technical support, U-value calculations, and project-specific guidance are available on request.

Compare the SuperFOIL Insulation Range

Summary

SuperFOIL SF6 is a compact, high-efficiency multifoil insulation that simplifies internal insulation by combining three essential functions in one product. It delivers dependable thermal performance, easy installation, and long-term durability — making it an excellent choice for both professionals and homeowners.