SuperFOIL SFTV 1L Reflective Vapour Control Layer – Ultra-Slim Radiant Barrier (2-in-1)

Quick difference vs SFTV:
SFTV 1L offers the same vapour control and reflective radiant performance as SFTV, but in a single-layer, lighter-weight format, making it ideal where minimal material thickness and fast installation are priorities.

SuperFOIL SFTV 1L is a reflective vapour control layer (VCL) designed for use on the internal (warm) side of roofs, walls, and floors. With a thickness of less than 1 mm, it combines vapour control and a radiant barrier in one ultra-slim membrane, helping to improve thermal efficiency while managing moisture safely within the building envelope.

It is suitable for new builds, retrofits, timber-frame construction, and DIY applications where space is limited and effective vapour control is required.

Product Dimensions & Coverage

• Thickness: < 1 mm

• Length: 20 m

• Width: 1.2 m

• Coverage: 24 m² per roll

2-in-1 Multifunctional Design

SuperFOIL SFTV 1L combines two essential functions in one product:

• Vapour control layer (VCL) to manage moisture movement

• Radiant barrier that reflects radiant heat when installed adjacent to an air space

This integrated design simplifies build-ups, reduces material layers, and supports compliance with modern building regulations.

Vapour Control & Radiant Performance

SFTV 1L is designed to control moisture on the warm side of the structure while enhancing thermal performance through reflection:

• Helps reduce condensation risk within insulated build-ups

• Reflects radiant heat back into the building in winter

• Reduces solar heat gain in summer

When installed next to a service cavity or air space, SFTV 1L delivers measurable thermal benefits.

Thermal Performance

Certified thermal performance when installed with adjacent air spaces
(core value + air spaces, EN 16012 methodology):

• Roof (incl. air spaces): 0.45 m²K/W

• Wall (incl. air spaces): 0.66 m²K/W

• Floor (incl. air spaces): 1.31 m²K/W

• Emittance: 0.05

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 confirms SFTV 1L’s role as an effective vapour control layer, suitable for internal applications where moisture control is critical.

Key Benefits

• Ultra-thin reflective vapour control layer

• Controls moisture on the warm side of the building

• Reflective radiant barrier improves thermal efficiency

• Lightweight and easy to handle

• Fast installation with no specialist tools required

• Minimal waste during installation

• Suitable for new builds and retrofits

• Made using up to 40% recycled materials

• Long service life (50+ years)

Applications

SuperFOIL SFTV 1L is suitable for use in:

• Roof constructions (internal side)

• Wall build-ups (internal side)

• Floor applications

It is typically installed as part of a dry-lining or service cavity system to maximise radiant performance.

Fire & Safety Performance

• Reaction to Fire (Euroclass): Class F

SFTV 1L – Quality & Certification

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

• CE certified for vapour control membrane 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 1L?

SFTV 1L is specified where vapour control, minimal thickness, and fast installation are required. Its single-layer construction makes it ideal for projects where weight and simplicity matter, while still delivering reliable radiant performance and moisture control.

It provides a practical alternative to thicker or multi-layer VCL systems without compromising compliance.

Summary

SuperFOIL SFTV 1L is an ultra-slim reflective vapour control layer that combines moisture management and radiant barrier performance in a lightweight, easy-to-install format. Designed for internal use, it supports energy-efficient construction while keeping build-ups thin and detailing simple — making it ideal for both professionals and informed DIY users.