SuperFOIL SFBA BB Breathable Bubble Foil Insulation – Reflective Venting Membrane for Walls

SuperFOIL SFBA BB is a breathable, reflective insulating venting membrane designed specifically for wall applications, particularly timber-frame and moisture-sensitive constructions.
Unlike vapour-closed bubble foils such as SFBA MP or SFBA 2/2, which are typically used on the warm side of the structure, SFBA BB is designed to be installed on the cold side of external walls, where breathability is essential to allow moisture vapour to escape safely.

This makes SFBA BB particularly suitable for timber-frame walls, lightweight constructions, and external wall build-ups where condensation control is critical, while still benefiting from reflective thermal performance when installed adjacent to an air space.

It combines insulation, a breathable venting membrane, and a radiant barrier in a single slim product, making it ideal for new builds, retrofits, timber-frame walls, and DIY applications where vapour permeability is required.

Product Dimensions & Weight

• Thickness: 4 mm

• Length (various): 50 m

• Width (various): 1.35 m

• Weight (various): 7.1 kg

• Coverage: 67.5 m²

3-in-1 Multifunctional Design

SuperFOIL SFBA BB integrates three essential functions into one product:

• Reflective thermal insulation

• Breathable venting membrane that allows moisture to escape

• Radiant barrier to improve thermal performance

This design helps manage moisture safely within wall constructions while improving energy efficiency.

Breathable & Watertight Wall Membrane

SFBA BB is rated W1 for watertightness, meaning it functions as a secondary rain barrier while remaining vapour-permeable.

• Allows moisture vapour to escape from the wall structure

• Significantly reduces condensation risk

• Protects against wind-driven rain penetration

This makes SFBA BB particularly well suited to external wall build-ups in timber-frame systems.

Thermal Performance

When installed adjacent to an air space, SFBA BB’s reflective surface enhances thermal performance.

Certified thermal performance (EN 16012):

• Core R-Value: 0.125 m²K/W

• Wall (incl. air spaces): 0.79 m²K/W

• Roof (incl. air spaces): N/A

• Floor (incl. air spaces): N/A

• 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.

Performance vs Traditional Membranes

Unlike standard breathable membranes, SuperFOIL SFBA BB provides both moisture management and reflective thermal performance.
When installed next to a cavity or air space, its reflective properties deliver measurable insulation benefits in addition to weather protection.

Key Benefits

• Breathable insulating membrane for wall applications

• Allows moisture vapour to escape

• Rated W1 for watertightness – secondary rain barrier

• Reflective surface improves thermal performance

• Slim, lightweight, and flexible

• Easy to cut and install

• No specialist tools required

• Minimal waste during installation

• Ideal for timber-frame walls

• Suitable for new builds and retrofits

Applications

SuperFOIL SFBA BB is suitable for use in:

• Timber-frame wall constructions

• External wall build-ups

• New build and retrofit wall systems

SFBA BB is designed for wall use only and should be installed in accordance with SuperFOIL installation guidance.

Fire & Safety Performance

• Reaction to Fire (Euroclass): Class F

SFBA BB – Quality & Certification

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

• CE certified to EN 13984:2013 for membrane performance

• Rated W1 for watertightness

• Tested to meet current building regulations when installed correctly

• Designed, tested, and supported by SuperFOIL technical specialists

Why Choose SuperFOIL SFBA BB?

SFBA BB is specified where breathability, moisture control, and wall-specific performance are essential. It is widely used in timber-frame construction to improve thermal efficiency while protecting the structure from moisture-related issues.

Its combination of venting, insulation, and reflectivity simplifies wall build-ups and reduces the need for multiple separate layers.

SuperFOIL SFBA BB & Recommended Accessories

Summary

SuperFOIL SFBA BB is a breathable, reflective venting membrane that provides insulation, moisture management, and secondary weather protection in a slim, easy-to-install format. Designed specifically for wall applications, it is an ideal solution for timber-frame and moisture-sensitive constructions where condensation control is critical.