Intelligent Membranes

The Global Standard in Liquid Airtightness & Envelope Protection

We don’t sell membranes.

We deliver building performance.

Intelligent Membranes is the market leader in liquid-applied airtight, vapour control and waterproofing systems — engineered to replace outdated sheet membranes, eliminate junction failure and guarantee measurable airtightness performance.

At the core of our system is the world-famous:

Passive Purple®

The original, category-defining liquid airtight membrane.

Passive Purple®

Airtight. Smoke Tight. Vapour Control. Radon Barrier. Methane Barrier.

Passive Purple® is a fully certified, polymer-based liquid membrane that forms a seamless, flexible, monolithic airtight layer across the building envelope.

It is:

Airtight (certified 0.03 ACH performance)
Smoke tight
Vapour control layer (VCL)
Certified radon barrier
Certified methane barrier
Passivhaus Certified
BBA Certified
Flexible & crack-bridging

It exceeds the Passivhaus requirement of 0.6 ACH by a factor of twenty.

Once cured, Passive Purple® becomes a continuous polymer skin across the internal envelope — eliminating rips, tears, failed tapes, staple holes and weak junctions that plague traditional sheet systems.

No laps.

No staples.

No tape failure.

No guesswork.

Just measurable performance.

We Don’t Just Supply.

We Install. We Guarantee.

Unlike most manufacturers, Intelligent Membranes offers a full installation and performance guarantee service.

We don’t walk away at delivery.

Our specialist teams:

Install the system correctly
Inspect critical junctions
Conduct quality control checks throughout construction
Return post-completion for verification where required

And we guarantee airtightness results of 0.6 ACH or lower.

Why 0.6 ACH Matters

Achieving 0.6 ACH (Air Changes per Hour at 50 Pa) means:

Reduced uncontrolled heat loss
Lower energy bills
Improved SAP / EPC performance
Reduced condensation risk
Elimination of cold draughts
Better indoor air quality
Protection against mould growth
Increased long-term building durability

In simple terms:

Lower ACH = lower energy waste + higher comfort + longer building life.

For Passivhaus and low-energy developments, 0.6 ACH is the benchmark.

We don’t aim for it.

We guarantee it.

Complete Intelligent Membranes System

Our products are engineered to work together as one integrated envelope solution.

Airtight & Vapour Control

Passive Purple® Airtight White – Internal airtight vapour control membrane
Passive Purple® External – Fire Class B breathable airtight weather barrier
Airtight Fleece Tapes – Plasterable airtight detailing
The Goat® Airtight Flexible Sealant – High-elongation penetration sealing

Waterproofing & Damp Protection

The Goat® Flexible Waterproof Coating – Reactive polymer membrane waterproofs within 60 seconds; ideal for new and existing roofs
Waterproof Blue Liquid DPM – Seamless damp proof membrane for floors and walls

Substrate Preparation & Adhesion

Primer IM – Micro-emulsion consolidating primer
Supergrip Primer – Plaster adhesion system

Masonry Protection

PassiveHaus Brick Seal Cream – Deep penetrating breathable masonry protection

Why Intelligent Membranes Leads the Market

Liquid Technology Over Sheet Failure

Installation Backed by Performance Guarantees

Certified Gas & Vapour Protection

Proven Passivhaus Results

Real On-Site Expertise

Reduced Risk for Developers

Fewer Remedials for Contractors

Better Comfort for Occupants

We are not a product supplier.

We are a building performance partner.

Passive Purple & FRED - Reaction To Fire Classification Report