As airtightness targets tighten across modular and high-rise construction, success increasingly depends on proven performance where it matters most — around junctions, corners, and penetrations. For modular and high-rise construction in particular, where sequencing is tight and material performance directly impacts energy efficiency and project outcomes, membrane specification is no longer just about ticking boxes. It’s about proven performance, practical installation, and long-term resilience.
Proshield is a fully self-adhesive, vapour-permeable and airtight membrane engineered by Don & Low specifically for modern construction challenges. Designed to streamline application while delivering measurable benefits in airtightness, moisture control, and fire safety, Proshield meets the real-world complexity of today’s builds.
PERFORMANCE WHERE IT COUNTS
One point often overlooked in the design phase is the difference between a membrane performing well on a simple flat run and one that holds up across real detailing: corners, door and window reveals, service penetrations, and junctions. These are the areas where most buildings actually leak air. That’s why Don & Low has placed a strong focus not just on the membrane’s properties, but also on how it performs as part of an airtight system.
Proshield has achieved KIWA certification, with independent testing verifying not only its base properties but also its performance in typical edge details and opening reveals. This distinction matters. Specifiers can trust that Proshield performs across the full range of geometries encountered on site or in modular manufacture, not just on simple flat surfaces.
This enhanced airtight performance is supported by a low vapour resistance, allowing the membrane to breathe and helping to reduce the risk of interstitial condensation, mould and subsequent structural degradation. For high-rise and modular projects where fire performance is paramount, Proshield offers Class B-s1, d0 fire classification when applied over appropriate non-combustible substrates, contributing to regulatory compliance without compromising envelope flexibility.
SIMPLICITY AND SPEED
Installation efficiency is a cornerstone of the Proshield system. Its robust 270g/ m² trilaminate structure combines a durable carrier, a high-tack adhesive, and a PET release liner, allowing fast, clean application without primers, tapes, or mechanical fixings. It bonds directly to fibre cement, calcium silicate, OSB, timber, concrete, steel, and more – making it especially suited to mixed-material modular wall panels. Whether applied in the factory or on site, Proshield forms a continuous bonded layer across walls and floors. The absence of additional fixing materials reduces labour time, speeds up air- and weathertight stages, and lowers the risk of detailing errors.
To ensure airtightness extends across all junctions, Don & Low also offers a matching range of accessories including Proshield tapes in various widths and preformed corners designed for clean detailing around windows, doors and complex intersections.
BUILT-IN CONFIDENCE
Manufactured in the UK at Don & Low’s vertically integrated facility, Proshield includes at least 20% recycled content and will be supported by a full Environmental Product Declaration – offering verified lifecycle data for sustainability reporting and Scope 3 assessments. BBA certification is underway.
Proshield offers confidence in its material properties and its real-world application. It’s not just a high-spec membrane; it’s a system solution backed by data, service, and technical support from a team that understands the challenges of designing and building today’s envelopes. For specifiers seeking clarity and assurance in an increasingly complex landscape, Proshield is a robust, compliant, and future-facing choice.
www.donlow.co.uk