Intelligent Membranes
Intelligent Membranes is a UK manufacturer of liquid-applied systems that make Passivhaus / passive house airtightness simple, on new build, retrofit, and heritage projects. Our brush/roll/spray membranes deliver seamless air and moisture control, helping teams achieve ultra-low air leakage and durable, fabric-first performance.

Flagship airtightness solutions include Passive Purple (internal liquid airtight membrane) and Passive Purple External, with Passive Purple X and Airtight White for detailing and design-led finishes. For wet-area tanking and moisture control, see Poseidon and Waterproof Blue – Liquid DPM. Below- and above-grade waterproofing is covered by The GOAT, while façade and masonry weatherproofing is handled by Passivhaus Brickseal. For projects requiring enhanced fire performance, Fred Fire Paint provides a Class A2-S1, D0 intumescent barrier.

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From pre-construction advice to site support, we help designers and contractors deliver certified Passivhaus and high-performance passive house outcomes, tight, dry, and built to last.

Check out some of our case studies

Reubens College

Oxford Brookes University

Ashe Construction

Retrofit