External wall membranes now play a central role in both fire safety and building performance. ARBOShield Pro Class A W1 Breather Membrane is designed to meet these demands by combining advanced fire resistance with effective weather protection and vapour permeability.
At its core, the membrane is engineered to limit fire spread within the façade cavity. Its Class A2-s1, d0 reaction to fire rating provides reassurance on projects where material selection is closely scrutinised, particularly in high-rise residential and public sector buildings. This makes it a strong choice for specifiers seeking compliant solutions without compromising overall wall build-up performance.
Beyond fire safety, ARBOShield Pro Class A W1 functions as a robust breather membrane. It resists water penetration to Class W1 while allowing moisture vapour to escape, helping maintain a dry and healthy wall structure. This balance is essential in modern, airtight buildings where moisture control directly impacts durability and occupant comfort.
The membrane is suitable for installation over a wide range of substrates, including sheathing boards, steel frame systems, concrete, blockwork, and window frames. Its high tensile strength and resistance to nail tearing support secure fixing during installation, while its flexibility at temperatures down to -40°C ensures performance across varying site conditions.
From a practical standpoint, the membrane is supplied in 1.2-metre-wide rolls, allowing efficient coverage and reduced jointing. High UV resistance provides flexibility during construction programmes, giving installers confidence where cladding installation may be delayed. Minor damage can be easily repaired using compatible high-tack tapes, helping maintain continuity without costly material replacement.
ARBOShield Pro Class A W1 is most effective when used as part of a fully integrated façade system, incorporating compatible air and vapour control layers, sealing tapes, and fire-resistant accessories. This system-based approach supports consistent detailing and reduces risk at critical junctions.
For contractors and specifiers working on complex or safety-critical projects, ARBOShield Pro Class A W1 offers a dependable solution that aligns fire performance, weather resistance, and buildability into a single membrane.
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