Intelligent Membranes

The paint that started it all. Passive Purple is our liquid-applied airtight and vapour control membrane — Passivhaus certified, BBA approved, tested to both ASTM and EN standards (ICC-ES ESR-4715), and a tested radon and methane barrier to boot. This collection gathers the whole family: spray/roller and brush grades, Airtight White for a lighter finish, Passive Purple External for façades, Retrofit Airtightness paints, plus the tapes and sealants that complete the airtight system. One purple coat, one continuous membrane, one air test passed.

Airtight White is the doppelgänger of Passive Purple, boasting the same liquid-applied airtight membrane that provides vapour control and smoke tightness, all available in a pleasing white that’s perfect for decorative finishes and visually appealing in exposed spaces. This product is Passivhaus certified, BBA approved, and has undergone rigorous testing to comply with ASTM and EN standards (ICC-ES ESR-4715). Additionally, it serves as a tested barrier against radon and methane. Select the 11.4kg spray/roller pail for larger applications, the 6.9kg Home Pack for brush use, or opt for the Brush Pack and Big Boy Bundle for a convenient all-in-one kit.

Passive Purple External enhances airtightness externally: a fire-rated (Class B) façade waterproofing membrane that can be applied using a spray, roller, or brush onto sheathing and masonry. This innovative solution effectively keeps weather out while ensuring air stays where it should. Available in vibrant purple, classic white, elegant black, and soft cream, our product comes in 5kg and 10kg packs, complete with brush grades for intricate details. This range also includes essential support products — Passive Purple X, Retrofit Airtightness paints, and Airtight Tape — ensuring that external junctions, reveals, and penetrations are sealed as part of a holistic and continuous system.

Our Airtight Tape is a premium, fleece-backed sealing tape specifically engineered to provide enduring airtightness and vapour control across a diverse array of construction details. With its flexibility, durability, and straightforward installation, it guarantees a dependable seal on even the most complex junctions and penetrations.

Ideal for both new builds and retrofit projects, Airtight Tape bonds exceptionally well to common building substrates such as timber, concrete, brick, and membranes. Its reinforced fleece surface facilitates excellent adhesion for plaster or paint, making it perfect for seamless integration into the building fabric.

By effectively eliminating air leakage at critical junctions, Airtight Tape enhances energy efficiency, comfort, and building durability, positioning it as an essential element for airtight construction and Passivhaus-standard developments.

Waterproof Blue is a premium polymer-modified liquid membrane specifically designed for comprehensive protection of foundations and floors. This robust formulation provides seamless waterproofing, effectively blocking vapour transmission while resisting UV degradation. Unlike traditional coatings that are prone to cracking and peeling due to structural movement, Waterproof Blue retains its elasticity and adhesion, ensuring long-lasting durability on foundation walls, concrete slabs, basement floors, and external surfaces. The liquid application method—using a roller or brush—creates a continuous barrier without joints or weak points, eliminating the need for corner reinforcement. Ideal for both new builds and retrofit projects, it adeptly bridges cracks while remaining flexible once cured. Suitable for both horizontal and vertical applications, Waterproof Blue offers reliable and essential protection against moisture and groundwater pressure.

Poseidon is our liquid-applied waterproof membrane designed specifically for bathrooms, wet rooms, and showers — the seamless tanking layer applied prior to tiling. Whether brushed, rolled, or sprayed on, it cures into a flexible, watertight barrier that adheres to NHBC and BS 5385-4 tanking guidelines, allowing you to tile directly over it. Opt for the 7kg option for a standard bathroom or the 12kg variant for wet rooms and larger projects — and discover how to effectively waterproof a wet room before tiling.

One liquid, any roof. The GOAT is our liquid-applied roof waterproofing membrane — CE-marked under ETA-25/0471 with a 25-year assessed working life and BROOF(t1) external fire performance. It cures into a seamless, flexible membrane that adapts to flat and steep roofs, terraces, balconies, upstands, and penetrations. It can be applied using a brush, roller, or spray — even on damp surfaces at temperatures as low as 0°C. Explore the size and colour options on The GOAT product page — choose from 18kg roller pails for large roofs or the 7.5kg thicker brush grade for treating upstands and detailing, available in black, grey, or solar-reflective white for cooler, longer-lasting roofs. Don’t forget to seal pipes and penetrations with The GOAT Liquid Grommet for a complete waterproofing solution.

Invisible and breathable water protection for brick and masonry – enhance energy efficiency and protect your walls for over 20 years.

Passivhaus Brickseal is a premium, cream-based water-repellent treatment specifically designed for masonry. This innovative solution offers robust protection for brick, concrete, sandstone, and mortar, penetrating deep into the substrate to create an unseen barrier against driving rain and moisture, all while ensuring your walls remain fully breathable.

Unlike conventional paints or surface coatings, Brickseal cures within the masonry itself, providing long-lasting weather protection without compromising the natural appearance of your walls.

By keeping walls dry, Brickseal significantly improves thermal efficiency, reduces heat loss, and safeguards buildings from damp-related issues — making it the perfect choice for retrofit upgrades, heritage properties, and new-build projects.

Fred by Intelligent Membranes is a state-of-the-art, high-performance fire retardant specifically engineered to protect spray foam insulation and timber structures from potential fire hazards. Crafted with innovative fire-resistant technology, Fred offers unrivalled protection whilst preserving the structural integrity of your building. Ideal for both new constructions and retrofitting projects, Fred ensures exceptional safety and peace of mind.

Intelligent Protect is a liquid-applied, peelable protective coating that sprays onto glass, windows, frames, and finished surfaces, drying into a robust temporary protection film. It effectively shields glazing from render, plaster, cement, paint overspray, grout, welding sparks, dust, and site debris. When the job is complete, it easily peels away in sheets, leaving no adhesive residue and ensuring a pristine finish at handover.

Intelligent Protect ACFR has received a fresh update! Introducing the new Intelligent Protect AC Flame Retardant coating film. This innovative solution combines anti-corrosion protection to defend metals against corrosion while offering essential fire safety.

The Intelligent Protect AC Flame Retardant coating is a ready-to-use, water-based liquid formulated with modified natural resins. It can be applied using an airless paint spray system and dries swiftly to create a peelable, flexible protective film, perfect for applications necessitating flame-retardant properties.

This advanced film shields non-porous surfaces from potential damage during construction activities.

With exceptional anti-corrosion capabilities, Intelligent Protect ACFR is particularly well-suited for use in the marine industry.

Once construction is completed, the protective film can be effortlessly removed without leaving any residue behind. It is suitable for both internal and external applications.

Phuck Off offers unparalleled protection for worktops and valuable items during construction projects. This heavy-duty, high-visibility adhesive film is simple to apply and effortless to remove, ensuring your surfaces are shielded from potential damage. Resistant to all weather conditions, it’s no wonder that everyone raves about this remarkable product. Not only is 'Phuck Off' incredibly effective, but it is also crafted from recyclable materials, allowing for reuse and promoting sustainability. Experience the ultimate in surface protection with Phuck Off!

The Surface Pro Brush is a 4kg liquid applied hard surface protection film designed for interior use. It employs natural latex that initially appears pink during application and dries to a transparent, hard, protective film. This film safeguards substrates from damage, dirt, paint spills, dust, and contamination, making it suitable for protecting bathroom fixtures such as shower trays and bathtubs during construction or renovation projects.

The product is brush applied, allowing for precise and even coverage on various substrates, including steel, concrete, and ceramics. Once protection is no longer needed, the film can be peeled off easily, leaving no residue behind. Surface Pro Brush features special anti-corrosion additives that provide additional protection for uncoated steel surfaces. 

The coating is solvent-free and biodegradable, ensuring environmentally friendly usage and disposal. This product is ideal for contractor use, renovation projects, and maintenance tasks where temporary, reliable surface protection is required within indoor environments. The package includes 4 kilograms of the protection film, designed for multiple applications depending on the surface size. Proper care involves simple removal by peeling and minor cleaning of residual adhesive, with no ongoing maintenance needed post-removal.

Designed specifically for the protection of bathroom fixtures and similar surfaces, the Surface Pro Brush offers a practical, eco-conscious solution for quick and effective surface safeguarding during building or refurbishment activities.

Our Asbestos Sprayed Coating is a high-performance, elastic, crack-bridging protective paint specifically designed to safely encapsulate asbestos-containing materials while providing a clean and decorative finish. Formulated with modified polymers and specialised additives, it effectively seals and stabilises asbestos surfaces such as:

• Asbestos roofing sheets
• Insulation materials
• Old paints and renders
• Other asbestos-based construction elements

Lime Prime is a waterborne primer specifically designed for application on porous and less cohesive substrates, prior to the use of waterborne dispersion coatings. This primer effectively consolidates the substrate, enhancing the adhesion of coatings on challenging surfaces and minimising the risk of surface defects. It is particularly suited for use on older, dusty substrates and porous materials such as concrete bricks, calcium silicate stone, and renders.

For retrofit projects—such as addressing a neglected vapour control layer—Lime Prime serves as the ideal initial step on bare, porous, or lime substrates. It solidifies the surface, allowing a liquid airtight membrane, like Passive Purple or Airtight White, to bond securely. This process aids in restoring airtightness to a BBA-approved, building-control-ready standard.

SUPERGRIP is a water-based primer specifically formulated to create an enhanced adhesive key for water-based polymer coatings before the application of plaster or plaster-based products.

Once Passive Purple or Passive Purple External / X has dried, effortlessly apply SUPERGRIP with a roller to provide the additional grip needed for dot-and-dab adhesive or plaster to bond securely to Passive Purple or Passive Purple External / X.

For best results, mix the product thoroughly using a paddle mixer, then apply it evenly with a roller.

SUPERGRIP is suitable for both wall and ceiling applications, making it an ideal choice for your plastering projects.

Our comprehensive supporting kit ensures you achieve a perfectly airtight finish every time. Complementing our high-quality liquid membranes, you'll discover Airtight Tape designed for junctions and penetrations, the Foil Applicator Gun for effortless sealant application, and Wohler smoke sticks and smoke tanks to identify leaks before your air test reveals them. Additionally, our Anti Oxidation Spray helps maintain your spray equipment in optimal condition.

Tape, sealant, and liquid membrane work seamlessly together as a unified airtight system—ensure your van is fully stocked with all three, so you’re never left short on-site.

Experience complete internal airtightness and vapour control with our innovative liquid system. The internal surfaces of your walls and roof are crucial for maintaining the airtight line—this is where air tightness tests can succeed or fail. Our liquid-applied vapour control layer (VCL) effectively replaces the need for sheets, laps, and tapes, providing a single seamless airtight coating for enhanced performance.

What is vapour control? Every occupied building pumps moisture into its own walls — cooking, showers, breathing — as warm, humid air. If that vapour gets into the structure and hits a cold surface, it condenses: damp insulation, mould, rotting timber. A vapour control layer (VCL) is the barrier on the warm side of the construction that manages how much moisture can pass in, so the building fabric stays dry and the insulation keeps working.

Traditionally that meant plastic sheets, laps and tape — with every staple hole and torn lap a leak. Our answer is vapour control paint: Passive Purple and Airtight White are liquid-applied VCLs — sprayed, rollered or brushed into one seamless membrane that is airtight, vapour-controlling and Passivhaus certified. The coloured finish doubles as quality control: if the wall’s purple (or white), it’s sealed.

Weatherproofing that is airtight, breathable, and fire-rated. A facade must effectively prevent wind-driven rain from entering, allow water vapour to escape, and maintain the airtight barrier — all simultaneously, for many years. Our liquid-applied weatherproof membranes achieve all three functions in a single application.

Radon and methane are quiet intruders. Ground gases infiltrate buildings through floors, junctions, and service penetrations — remaining invisible and odourless. In the case of radon, it is the second leading cause of lung cancer in the UK, following smoking. In areas where these gases are present, Building Regulations mandate the installation of a gas barrier — and like any effective barrier, it must be continuous.

Our liquid-applied membranes create this essential continuous barrier by being effortlessly painted or sprayed on. Passive Purple and Airtight White have undergone independent testing to serve as effective radon barriers (with a diffusion coefficient of 3.3×10⁻¹² m²/s in accordance with ISO/TS 11665-13) as well as methane and ground-gas barriers (following ISO 15105). Moreover, these products provide airtightness and vapour control in a single application. They are particularly suited for retrofitting, as installing a traditional sheet gas barrier in an existing building can be challenging and cumbersome.

Liquid waterproofing solutions for every wet area of your building. Waterproofing often fails at crucial details — corners, junctions, upstands, and penetrations — precisely where traditional sheets and trays are most vulnerable. Our liquid-applied waterproof membranes cure into a single seamless, flexible barrier that effortlessly flows around intricate details rather than struggling against them.

Our extensive range caters to all aspects of your building: Waterproof Blue liquid DPM is designed for basements, foundations, and floors; Poseidon provides ideal tanking solutions for bathrooms and wet rooms prior to tiling (BS 5385-4 / NHBC compliant); The GOAT is perfect for roofs, terraces, and balconies — ETA-certified with an assessed working life of 25 years; and Passivhaus Brickseal effectively prevents penetrating damp through exposed brickwork.

Flat roofs and balconies often encounter issues at the details — which is why we've eliminated the complications. The GOAT is a cold-applied liquid roofing membrane that effortlessly flows around upstands, outlets, plant bases, pipework, and parapets, curing into a single seamless, flexible, and fully-bonded waterproof layer. No need for a torch, hot works permit, laps, or seams — plus, it comes with an ETA-assessed lifespan of 25 years.

A dark roof during the summer can reach temperatures that are 40–50°C higher than the surrounding air, causing heat to transfer into the rooms below. Our innovative solar reflective roof coating changes this dynamic: The GOAT in solar reflective white effectively bounces solar radiation away before it can convert into heat, significantly cooling the roof surface, reducing the burden on air conditioning systems, and safeguarding the membrane from UV damage and thermal stress. Unlike conventional "solar reflective paints" that merely enhance an ageing felt roof, this solution is more than just a coating — it is a seamless, cold-applied, ETA-certified liquid waterproofing membrane with a remarkable 25-year assessed lifespan.

In the UK, the majority of flat roofs are constructed using bituminous materials such as built-up felt, torch-on, or mineral cap sheets. Many of these roofs are aging, dark, and absorbing heat throughout the summer months. Fortunately, you don't need to strip them away to find a solution. The GOAT Solar Retrofit is a waterborne, solar-reflective cool roof coating that can be directly applied over your existing bituminous roof. This innovative solution reflects sunlight, safeguards the old membrane, and creates a seamless waterproof surface. It's a genuine retrofit, applied cold in just one visit, without the need for torches or the hassle of removal.