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Breathable 3-in-1 Protection: Combines high-performance insulation, a radiant barrier, and a W1 watertight breathable membrane to prevent condensation while protecting against rain.
Superior Thermal Efficiency: Features 19 layers of perforated foil and wadding with a core R-Value of 2.85.
Streamlined External Install: Designed for use under roof tiles or behind cladding, it eliminates the need for separate membranes, saving time, reducing waste, and saving space.
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SuperFOIL SF40BB is the ultimate breathable version of the best-selling SF40 insulation. Designed specifically for external use, it combines high-performance thermal insulation with a certified W1 Watertight Breathable Membrane. This means it keeps heat in, stops rain from getting in, but allows moisture from inside your home to escape—preventing condensation and mould.
SuperFOIL SF40BB acts as your Insulation, Breather Membrane, and Radiant Barrier all in one. With 19 layers of perforated foil and wadding, it achieves a massive Core R-Value of 2.85, significantly upgrading the energy efficiency of new builds and extensions.
Ideal for Timber Frames & External Projects Perfect for use on the cold side of the building (under roof tiles or behind wall cladding), SF40BB simplifies construction. It saves space, reduces waste, and eliminates the need for a separate breather membrane, saving you time and money on installation.
