Passive Purple Retrofit Installation in London – Airtightness for Energy Efficiency

Retrofit in London — Passive Purple Airtight Retrofit

Project Overview

A full-scale London retrofit incorporating high-performance extensions. Following a complete strip-out, Passive Purple’s liquid-applied airtight membranes were deployed to create a continuous, seamless air and vapour control barrier, enabling outstanding thermal and moisture performance.intelligentmembranes.com+14intelligentmembranes.com+14intelligentmembranes.com+14

Solution

• Passive Purple Brush was meticulously applied to all joints, service penetrations, and junctions.
• Airtight Fleece Tape reinforced critical edges and tough details.
• Passive Purple Internal Vapour Control Layer was spray-applied over blockwork, ceilings, and junctions, securing a monolithic airtight and vapour-tight envelope.intelligentmembranes.com+7intelligentmembranes.com+7NBS Source+7

Results

• Achieved a remarkable 0.3 ACH airtightness score—well within Passivhaus standards and significantly better than UK building regulations.
• Delivered reduced energy demand, improved occupant comfort, and minimised condensation risk, all while preserving building longevity.intelligentmembranes.com+7intelligentmembranes.com+7intelligentmembranes.com+7
• “My house was a vision in purple… I’m no longer dreading my energy bills.” (Homeowner testimonial) intelligentmembranes.com+1

For specification details, reference the full case study on Intelligent Membranes’ website: [Passive Purple Retrofit Installation in London – Airtightness for Energy Efficiency CONTACT US