The One and Only



Spray Applied

Roll Applied

Intelligent Airtight Liquid Vapour Control Membrane

Passive Purple - spray/roll - internal airtight vapour control


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


Passive Purple is a fully BBA certified liquid airtight vapour control layer


A single installer can apply up to 300m2 of Passive Purple a day using an airless spray device. Construction is sped up, and labour costs are dramatically reduced with this easy airtight paint


Passive Purple is an M1 class, VOC-free water-based product. Zero nasty chemicals makes Passive Purple friendly for both the user and the environment


Passive Purple is certified as a radon barrier, making it perfect for stopping nasty radon gases from entering your building


Passive Purple is Passivhaus certified vapour control to empower you to build smarter, economical and ecological buildings


What is Passive Purple?

A Closer Look at 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.
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.

About us - complete airtightness and vapour control

Passive Purple

Supply or Install we've got you covered

Passive Purple can both supply and/or install your Passive Purple solution. Let our Passivhaus certified experts support you on your next project. 

Passive Purple Install

How to apply Passive Purple

Passive Purple is applied with an airless spray machine, such as the Graco 495, Graco 595 or similar products.

Passive Purple airtight liquid adheres to most substrates known to the construction industry. From Blockwork, Concrete, OSB, MgO Board, Spray applied & PIR insulation, Timber and Steel. A build with multiple substrate changes is an easy task to perform unlike traditional methods. 

Buy Passive Purple online

Passive Purple Online Ordering

Buy passive purple online

Passive Purple is available for purchase online and can be shipped anywhere in the world. We even have all your constructions details already drawn , just take a look at our standard details on the downloads page