Passive Purple Brush Pack

What is Passive Purple?

• Passive Purple liquid airtight vapour control membrane is an airtight coating applied using an airless spray device on all areas of the external envelope (warm side of the insulation) of a building. This includes difficult connection areas such as floors, walls, roofs, and joists.
• When Passive Purple is used on the warm side of the insulation, it can be applied to either face of the external envelope.
• Before application, ensure the surface is solid, dust-free, and closed.
• A closed surface means all holes and joints must be sealed beforehand:
  • Large holes and joints (>5mm): seal using fast-setting cement-based products or polyurethane foam.
  • Small holes and joints (2–5mm): seal directly using Passive Purple Liquid Brush, the thicker brush-applied version.
• After preparation, Passive Purple can be spray-applied with an airless machine, allowing a single operator to apply up to 300m² per day.
• For smaller projects, such as private houses, Passive Purple Brush can be applied using a flat paintbrush.
• Wall-to-ceiling connections must also be made airtight, especially where different construction materials meet, such as brick to concrete or steel to concrete.
• Different construction materials respond differently to changes in humidity and temperature, which can cause small cracks in finishes. These cracks may lead to air leakage, reduced energy performance, and an increased risk of damp and mould.
• Both airtight paints can be used for wall-to-ceiling connections: Passive Purple spray-applied and Passive Purple Brush.
• Get in touch with our team at info@intelligentmembranes.com to learn more about Passive Purple and airtightness solutions.

Note: If you do not have an airless sprayer but still wish to install Passive Purple yourself, a roller-applied version is also available. While application may take a little longer, it delivers the same reliable airtight performance.