When building tall, fire safety is the number one priority. Standard membranes are no longer enough.
Passive Purple X is formulated specifically for the demands of high-rise and commercial structures.

• Certified Safety: Rated Class B-s1, d0. It makes a limited contribution to fire and produces low smoke, meeting the strict requirements for buildings over 11m and 18m.
• Dual Use: Fully certified for use on both the Internal (warm side) and External (cold side) of the building envelope.

This is the game-changer for Architects and Energy Consultants.Usually, you
are stuck with the fixed vapour resistance of a specific sheet membrane. Passive Purple X gives you precision control.
You can adjust the Sd Value (equivalent air layer thickness) of the membrane simply by altering the applied thickness of the coating.

• Need higher breathability? Apply a thinner coat. Perfect for external applications or solid wall retrofits where moisture escape is critical.
• Need higher vapour resistance? Apply a thicker coat. Ideal for internal applications where you need a stronger check against moisture entering the structure.

One Product.Any Specification.
Stop buying different rolls for different walls. Just calibrate your spray gauge.

1. Internal High-Rise (SFS & Concrete)
Used as the primary internal Airtightness and Vapour Control Layer (AVCL).

• Why X? Because high-rise residential corridors and commercial spaces require that Class B fire rating for compliance.
• The Benefit: Sprays rapidly over steel framing systems (SFS), concrete cores, and drylining, sealing the building against wind pressure and heat loss.

2. External High-Rise (Behind Facades)
Used on the external face of the sheathing board or blockwork before the insulation and rainscreen cladding are installed.

• Why X? It provides a water-resistant, airtight skin that creates a fire-safe backdrop for your facade system.
• The Benefit: Because it is UV stable and durable, it protects the building structure during the construction phase before the cladding goes on.