Passivhaus Performance Through Intelligent Airtightness


Passive Purple External is a high-performance liquid-applied airtight membrane developed for external building envelope applications. The system provides a seamless airtight and weather-resistant barrier across masonry, concrete and mixed substrates, helping reduce heat loss, improve thermal performance and enhance energy efficiency. Its vapour-permeable formulation allows moisture to escape from the structure while protecting against wind-driven rain, making it ideal for Passivhaus, retrofit, residential, commercial and educational construction projects. On The Dairy Passivhaus project, Passive Purple External helped create a robust, breathable and airtight building envelope capable of delivering long-term performance and sustainability benefits.

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INTERNAL

Supporting Passivhaus Performance

The Dairy is a high-performance Passivhaus project designed to achieve exceptional levels of energy efficiency, airtightness and occupant comfort. To meet the demanding requirements of Passivhaus construction, the project required a continuous airtight building envelope, robust moisture management and meticulous attention to detail throughout the build.

Passive Purple Airtight Vapour Control Membrane was used across walls, ceilings and critical junctions to create a seamless airtight layer, while Passivhaus Airtight Sealant ensured continuity around windows, doors and service penetrations. Passive Purple External provided a weather-resistant, vapour-permeable protective layer to the external envelope, and Passivhaus Brick Sealer Cream was used to enhance the durability and moisture resistance of the masonry façade.

Through rigorous testing, careful detailing and the use of Intelligent Membranes products, The Dairy demonstrates how intelligent airtightness solutions can help deliver outstanding building performance, reduced energy consumption and long-term sustainability.

Site Manager Testimonial

"It's all about preparation and precision, and Passive Purple has been a game-changer for us. From airtightness to moisture control, these products have turned a painstaking process into something faster, more reliable and more effective. If Passive Purple can perform on a project as demanding as The Dairy, you know it's the real deal."

Nathan Page, Site Manager, Paul and Page Ltd

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The Dairy Passivhaus project showcases how Passive Purple & Passive Purple External helped create a highly airtight, energy-efficient and sustainable building envelope. Through meticulous detailing, rigorous airtightness testing and advanced moisture management strategies, the project demonstrates best practice in Passivhaus construction and low-energy building design.