Perimeter sealing is one of the most vulnerable points in any façade. ARBOShield Pro External Perimeter Class A Membrane (EPAM®) is designed to simplify this critical detail by combining fire resistance, airtightness, and waterproofing into a single, easy-to-install membrane.
Traditional perimeter sealing methods often rely on multiple materials, wet adhesives, and complex detailing, increasing the risk of inconsistency and site error. EPAM® removes much of that complexity. Its self-adhesive backing allows direct application to common construction substrates, creating a continuous seal around window and door openings without additional bonding agents.
Fire safety is a defining feature. With a Class A2-s1, d0 reaction to fire, EPAM® is suitable for use on high-rise and high-risk buildings where external wall components are subject to close scrutiny. This performance helps limit fire spread at façade junctions, which are often identified as weak points during fire risk assessments.
From a building performance perspective, EPAM® delivers both airtightness and weather resistance. It prevents uncontrolled air leakage around openings, improving energy efficiency and occupant comfort, while also resisting wind-driven rain to Class W1. Its vapour-open nature allows moisture to escape, reducing the risk of trapped condensation at frame interfaces.
The membrane’s ability to bond at temperatures down to -40°C gives contractors greater flexibility in programme planning. Cold weather installation no longer needs to compromise perimeter sealing quality, helping projects stay on schedule throughout the year. EPAM® is also supplied in a range of widths, allowing installers to select the most appropriate size for each detail and minimise overlaps.
EPAM® works best as part of a system. When used alongside ARBOShield breather membranes, air and vapour control layers, and compatible sealing tapes, it supports a coherent approach to façade airtightness and fire performance. This system-based design reduces risk at interfaces and simplifies specification.
For specifiers, contractors, and façade installers, ARBOShield Pro EPAM® offers a reliable, compliant solution that addresses one of the most challenging areas of the building envelope with confidence.
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