HIGH - RISE AIRTIGHT & FIRE PROTECTION SYSTEM

Passive Purple® + FRED — Intelligent Membrane System

Passive Purple & FRED, when combined, create a cutting-edge fire-retardant and airtight vapour control system engineered for maximum performance. Designed for demanding construction projects, from Passivhaus builds to high-rise developments, this innovative solution delivers exceptional fire resistance, superior airtightness, and advanced vapour control. As a Class B High-Rise Airtight & Fire Protection System, it meets the strict requirements of tall buildings.

Features

Fire Class B Certified (EN 13501-1)
when used together
Superior Fire Retardancy &
Intumescent Properties

Resistant to Radon Gas &
High Temperatures

Strong Adhesion to Multiple
Substrates
Meeting Passivhaus, EnerPHit, and
High-rise Building Regulations

How the Passive Purple + FRED system works

Airtightness and fire safety are usually specified as two separate packages. This system puts them in one liquid-applied build-up, applied in two stages.

Stage 1 – the airtight layer: Passive Purple
Passive Purple is sprayed, rolled or brushed onto the substrate to form a seamless airtight and vapour-control membrane. On its own it is classified Euroclass C-s1,d0 to EN 13501-1: very low smoke (s1) and no flaming droplets (d0).

Stage 2 – the fire upgrade: FRED
Once Passive Purple is dry, FRED, a white intumescent fire-protection topcoat, is applied over it. Together the two coatings are classified Euroclass B-s1,d0.

What the Class B classification covers

Classified to EN 13501-1 by PAVUS a.s. (Czech Republic, Notified Body 1391), report reference PK1-01-25-014.
Valid on A1 substrates with a density of 653 kg/m³ or more.
The B-s1,d0 classification belongs to the Passive Purple + FRED system. Passive Purple alone is C-s1,d0.

Where the system is used

High-rise and cladding remediation
When old cladding is stripped, the system is sprayed onto the exposed backing wall from the scaffold. That makes the envelope airtight and lifts the face of the wall to Class B-s1,d0 without entering occupied flats.
See the high-rise system
Passivhaus and EnerPHit
Passive Purple gives the continuous airtight and vapour-control layer that Passivhaus and EnerPHit targets depend on. FRED is added where the specification also calls for a higher reaction-to-fire class.
Passive Purple fire performance explained
Timber frame and spray foam
FRED is also used as a fire-protection topcoat over timber and spray foam insulation, and has been tested on a load-bearing timber frame panel.
Fire protection for timber frame and spray foam

Common questions

Is Passive Purple fire rated on its own?
Yes. Passive Purple alone is Euroclass C-s1,d0. FRED is what lifts the build-up to Class B.

When do I need FRED?
When the specification asks for a higher reaction-to-fire class than C-s1,d0, for example on high-rise facades and cladding remediation.

When is FRED applied?
After the Passive Purple membrane has dried. Follow the FRED install guide below for preparation, coverage and drying times.

Can you help with my specification?
Yes. Send us your drawings and the technical team will mark up the airtight and fire-protection details for you.