FIREFLY™ Membrane WP is a non-combustible, vapour-permeable fire-resistant membrane designed for use within ventilated façade systems, including high-rise applications above 18 metres. Certified to Class A2, s1-d0 (EN13501-1), this robust aluminium-laminated woven glass membrane functions as a reflective insulation layer, offering breathable protection against external elements without compromising fire performance.
Lightweight and easy to install, it is mechanically fixed and joined using fire-rated foil tape, making it an ideal solution for both new-build and remedial cladding projects. The membrane maintains performance even after weathering and is resistant to damage during installation in temperatures as low as -40°C.
Key Benefits
-
A2, s1-d0 fire classification to EN 13501-1: suitable for buildings over 18m in height
-
Vapour-permeable and weather-resistant – allows building fabric to breathe
-
Durable construction using aluminised woven glass for long-term strength
-
Proven water resistance (W3) both pre- and post-ageing (EN 13111)
-
High tensile and tear resistance even in extreme temperatures (down to -40°C)
-
Quick and easy to install – can be stapled or screw-fixed and jointed using foil tape
-
Ideal for ventilated facades, rainscreen cladding, and external envelope upgrades
Applications
-
Suitable for ventilated façade systems and rainscreen cladding
-
Recommended for use on high-rise buildings (above 18m)
-
Ideal for upgrading existing facades to meet fire safety standards
-
Can be used in both new build and refurbishment projects
Technical Specifications
-
Material: Aluminised woven glass membrane
-
Reaction to Fire: A2, s1-d0 (EN 13501-1)
-
Flame Propagation: Class 0 (BS 476 Parts 6 & 7)
-
Water Vapour Resistance (Sd): 0.02 m (silver face), 0.03 m (reverse)
-
Water Penetration Resistance: W3 (EN 13111)
-
Tensile Strength: >2200 N/50mm (MD), >1800 N/50mm (CD)
-
Tear Resistance (Nail Shank): >200 N
-
Dimensional Stability: 0.01% (MD), 0.0% (CD)
-
Flexibility at Low Temperatures: No cracking at -40°C
-
Thickness: 0.2 mm
-
Width: 125 cm
-
Roll Length: 50 m
-
Roll Area: 62.5 m²
-
Weight: 225 g/m² (approx. 14 kg per roll)
Packaging
-
Supplied in 50m rolls
-
Each roll is 125cm wide and individually wrapped
-
Joints must be sealed using fire-rated foil tape (e.g., Bostik Idenden T303)
-
Must be mechanically fixed — not adhered with adhesives or non-mechanical means