A+ Certified BBA Certified
SKU: IM/00PPS6.9

Internal Airtight Vapour Control Paint (6.9kg) – Brush- Home Pack

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Product Collection: Passive Purple
Applied By: Brush
Colour: Purple

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Passive Purple is the world’s most airtight liquid-applied vapour control membrane. BBA, Passivhaus and EPD certified.

Passive Purple is a VOC-free water-based product. It’s completely free of any nasty chemicals or fumes. What’s more, as a water-based product, cleaning your paintbrushes and airless spray device is a smooth, no mess task.

Key Points:

  • Vapour control layer
  • Passivhaus certified
  • Airtight easy to use paint brush applied
  • Great for retrofit and new builds
  • Smoke Tight
  • ICC tested and Certified
  • BBA approved and Certified
  • 1kg will cover 1m2

Also available in white and a range of different colours, view our product specs for the full selection.

Please contact us for information on other colour variants.

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  • Key Details

    Why Choose Passive Purple?

    • BBA Certified & Passivhaus Certified Passive Purple is a fully BBA certified Liquid Airtight Vapour Control Layer.
    • Radon Barrier Passive Purple offers you a perfect Radon Barrier to eliminate those nasty radon gases entering your building.
    • Up To 300M2 Coverage A Day A single installer can apply up to 300m2 of Passive Purple a day using an airless spray device. This speeds up the construction time and dramatically cuts labour costs.
    • Passivhaus Certified Passive Purple airtight vapour control is a certified Passivhaus component.
    • M1 Class, VOC Free Passive Purple is an M1 class, VOC-free water-based product. Zero nasty chemicals make it friendly for the user and the environment.
    • Fire Class C Passive Purple is rated Fire Class C, unlike paper membranes which are rated Fire Class E.
    • 0.6ACH Or Under With a Passivhaus certified score of 0.03ach (20x lower than the required 0.6ach) Passive Purple can guarantee you a score of 0.6ach (air changes per hour) and under. Whether you’re trying to achieve certified Passivhaus or just build to a Passivhaus standard, Passive Purple is your answer!
  • Description

    What is Passive Purple?

    • Passive Purple liquid airtight vapour control membrane is an airtight coating that is applied with an airless spray device on all areas of an external envelope (warm side of the insulation) of a building. This includes those difficult connection areas to the floor, wall, roof and joist.
    • When Passive Purple is used on the warm side of the insulation, it can be applied to either face of the external envelope.
    • To install Passive Purple, you simply need to ensure the material or surface is dust-free, solid and closed before starting the application.
    • A closed surface implies that holes and joints need to be closed beforehand: large holes and joints (> 5mm) can be closed with a fast setting cement-based products or polyurethane foam, small holes and joints (2-5mm) can be closed with Passive Purple Liquid Brush, this is a much thicker (paintbrush applied version of Passive Purple).
    • After these preparations, Passive Purple can be sprayed on with an airless machine, allowing you to apply up to 300 m2 per day with a single operator.
    • For small projects, such as private houses, Passive Purple Brush can be used with a flat paintbrush.
    • The wall and ceiling connections also need to be made airtight, especially when the connections are made of two different types of construction materials such as red brick and concrete or steel and concrete.
    • Different construction materials react differently to changes in humidity, temperature and move at different rates, which can lead to small cracks in plaster or another type of finishing. This can create air leaks that will cause the energy performance of your building to suffer and potentially opening the gateway for damp and mould to appear.
    • Both airtight paints can be used for these wall to ceiling connections: Passive Purple spray-applied and Passive Purple brush.
    • Get in touch with our team info@intelligentmembranes.com if you want to know

    Note: If you don’t have an airless sprayer but would still wish to install Passive Purple yourself, don’t worry, we have a roller version for you. It may take a bit longer, but it still gets the job done.

    Additional information


    3.7kg (Brush Only), 6.9kg (Brush Only), 11.4kg (Spray / Roll Applied)



  • Uses

    Passive Purple Uses

    Airtight flexible coating that has excellent adhesion on different surfaces such as:

    • Concrete
    • Brick
    • Wood
    • Floor/wall connections
    • Ceiling connections
    • Vertical and horizontal joints

    Also classed as a radon barrier protection.

  • Data Sheets & Certificates
  • Architects Specification

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  • Delivery

    All delivery charges are included in the price of the products and are dependent on the products selected for purchase. This charge is based on delivery to mainland UK, excluding the Scottish Highlands & the Islands where additional shipping charges will apply. For more information read our delivery policy in full.

    Intelligent Membranes do not offer a next day delivery service.

    Intelligent Membranes aim for deliveries to be with the customer within 2 working days. During the festive period deliveries could take longer.

    Orders placed before 12pm will be dispatched the same day, any orders placed after 12pm will be dispatched the following working day

  • Returns

    We, at Intelligent Membranes, would like you to be 100% satisfied with your purchase and our service. In the unfortunate event of any item being unsuitable or wrong, please read our returns policy in full.

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