SuperFOIL SFTV Reflective Vapour Control Layer – 2-in-1 Radiant Barrier Membrane

SuperFOIL SFTV is a reflective vapour control layer (VCL) combined with a radiant barrier, designed to improve thermal performance and condensation control in roofs, walls, and floors.
With an ultra-thin profile of less than 1 mm, SFTV provides an efficient way to enhance insulation performance when used alongside other insulation materials.

SFTV is suitable for new builds, retrofits, timber-frame construction, and DIY projects, where vapour control and reflective performance are required without adding bulk to the build-up.

Product Dimensions & Weight

• Thickness: < 1 mm

• Length: 25 m

• Width: 1.5 m

• Weight: 4.8 kg

• Coverage: 37.5 m²

2-in-1 Functional Design

SuperFOIL SFTV combines two essential functions in a single membrane:

• Reflective radiant barrier to improve thermal performance

• Vapour control layer (VCL) to reduce condensation risk

This 2-in-1 design simplifies construction by reducing the need for separate layers while supporting compliance with modern building regulations.

Reflective Thermal Performance

SFTV improves thermal performance by reflecting radiant heat when installed adjacent to an air space, such as a cavity.

Certified thermal performance (EN 16012):

• Core R-Value: N/A

• Roof (incl. air spaces): 0.90 m²K/W

• Wall (incl. air spaces): 1.31 m²K/W

• Floor (incl. air spaces): 2.62 m²K/W

• Emittance: 0.05

These values demonstrate how SFTV enhances the effectiveness of traditional insulation systems by addressing radiant heat transfer.

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.

Water Vapour Control Performance

• Water vapour resistance: ≥ 1200 MN·s/g

This high vapour resistance helps prevent moisture migration into the building fabric, reducing condensation risk and supporting airtight, energy-efficient construction when installed correctly.

Performance vs Standard Vapour Control Layers

All SuperFOIL reflective membranes, including SFTV, are tested and certified to deliver almost three times the thermal performance of a standard vapour control layer when installed with an air space.

This significantly reduces condensation risk while improving thermal efficiency in roof, wall, and floor applications.

Key Benefits

• Reflective radiant barrier and vapour control layer in one product

• Ultra-thin profile – ideal where space is limited

• Improves thermal performance when used with air spaces

• Helps reduce condensation risk

• Lightweight, flexible, and easy to handle

• No specialist tools required

• Quick installation with minimal waste

• Suitable for roofs, walls, and floors

• Supports compliance with building regulations

• Made using up to 40% recycled materials

Applications

SuperFOIL SFTV is suitable for use in:

• Roof constructions

• Wall build-ups

• Floor structures

• New build and retrofit projects

• Timber-frame construction

For best performance, SFTV should be installed adjacent to an air space and sealed using compatible reflective foil tape at joints and penetrations.

Fire & Safety Performance

• Reaction to Fire (Euroclass): Class F

SFTV – Quality & Certification

• Manufactured under a certified ISO 9001:2015 quality management system (manufacturer level)

• 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

Why Choose SuperFOIL SFTV?

SFTV is specified where vapour control, condensation management, and radiant heat reflection are required as part of a complete insulation build-up. It is commonly used alongside traditional insulation materials to enhance overall thermal efficiency without increasing build-up depth.

Its ultra-thin design makes it particularly valuable in retrofit projects and space-restricted constructions.

SuperFOIL SFTV & Recommended Accessories

Summary

SuperFOIL SFTV is a high-performance reflective vapour control membrane that improves thermal efficiency and reduces condensation risk in roofs, walls, and floors. With its ultra-thin profile, ease of installation, and certified performance, it is an ideal solution for both professional contractors and informed homeowners.