Moisture management is one of the most important factors in achieving durable, energy-efficient buildings. ARBOShield Pro Class B W1 Breather Membrane is designed to support this by providing a highly vapour-open external layer that protects the structure while allowing the wall to breathe.
Unlike impermeable barriers that can trap moisture, this membrane allows water vapour to pass through the façade build-up while preventing liquid water ingress. This makes it particularly suitable for modern constructions that rely on airtight internal layers combined with vapour-open external membranes to manage condensation risk effectively.
The membrane is suitable for use on light steel frame and modular construction, as well as other wall systems where a flexible and lightweight breather membrane is required. Its Class W1 water resistance ensures dependable protection against wind-driven rain, while its flexibility down to -40°C supports installation and performance across a wide range of site conditions.
Fire performance is an increasingly important consideration. ARBOShield Pro Class B W1 is classified to Class B-s1, d0, offering a higher level of fire resistance than standard breather membranes when installed onto a Class A substrate. This makes it a practical choice for projects where enhanced fire performance is required but a Class A membrane may not be specified throughout the façade.
From an installation perspective, the membrane is supplied in wide rolls to reduce jointing and speed up coverage. High UV resistance allows it to remain exposed for extended periods during construction without degrading, providing greater flexibility in build programmes. Minor damage can be easily repaired with compatible sealing tapes, helping maintain continuity without unnecessary material waste.
ARBOShield Pro Class B W1 works best as part of a coordinated façade system, used alongside compatible air and vapour control layers, perimeter membranes, and sealing accessories. This system-based approach reduces interface risk and helps achieve consistent performance across the building envelope.
For contractors and specifiers seeking a balance between vapour permeability, weather protection, and improved fire performance, ARBOShield Pro Class B W1 Breather Membrane offers a reliable and practical solution.
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