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Leak-proofing paint THE BIG BOY BUNDLE
protectiveinteriorexterior

Leak-proofing paint - THE BIG BOY BUNDLE - Intelligent Membranes - protective / interior / exterior
Leak-proofing paint - THE BIG BOY BUNDLE - Intelligent Membranes - protective / interior / exterior
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Characteristics

Function
protective, leak-proofing
Location
exterior, interior
Application
for wall, for ceiling, for floor
Support
for wood, for concrete, for bricks, for roof
Component
water-based, cement-based
Options
quick-set, VOC-free

Description

What is Passive Purple and where to apply?
  • Passive Purple is a water-based liquid airtight vapour control membrane applied to the warm side of insulation on floors, walls, roofs and joists to create a continuous vapour control and airtight layer.
  • It can be applied to either face of the external envelope when installed on the warm side of the insulation.
  • Surface preparation: substrates must be solid, dust-free and closed. All holes and joints must be sealed prior to application:
    • Large holes and joints (>5 mm): seal with fast-setting cement-based products or polyurethane foam.
    • Small holes and joints (2–5 mm): seal using Passive Purple Brush (brush-applied product).
  • Application methods: airless spray for high productivity, brush-applied (Passive Purple Brush) or roller-applied versions for small projects or where airless equipment is unavailable.
  • Productivity: a single installer can apply up to 300 m² per day with an airless sprayer.
  • Ensure airtight connections at wall-to-ceiling junctions and between different materials to avoid air leaks, energy loss and risk of damp or mould.


Key certifications and performance
  • BBA certified liquid airtight vapour control layer and certified Passivhaus component.
  • Provides radon barrier performance to reduce radon entry into buildings.
  • M1 class, VOC-free, water-based formulation for low emissions.
  • Fire rating: Fire Class C.
  • Excellent airtightness performance: product test data shows results down to 0.03 ACH and is suitable to achieve 0.6 ACH or better at building level when used correctly.


Compatible substrates and typical uses
  • Adheres to common building substrates including concrete, brick and wood.
  • Ideal for floor-to-wall and wall-to-ceiling connections, vertical and horizontal joints and junctions between materials.
  • Also used as a radon protection layer in foundations and lower envelopes.


Technical specifications
  • Application methods: airless spray (high productivity), brush-applied Passive Purple Brush, roller-applied option.
  • Coverage (spray): up to 300 m² per installer per day, dependent on substrate and site conditions.
  • Certifications: BBA certified; Passivhaus certified component; material data available for hygrothermal design tools.
  • Emissions: M1 class, VOC-free, water-based formulation.
  • Fire rating: Class C.
  • Airtightness: certified low air-change rates (example test result: 0.03 ACH); capable of supporting building-level 0.6 ACH or lower when integrated correctly.
  • Suitable substrates: concrete, brick, wood and typical building materials; designed for warm-side installation.
  • Surface preparation: solid, dust-free, closed surfaces; large gaps >5 mm sealed with cement-based or PU foam; 2–5 mm gaps sealed with Passive Purple Brush.
  • Radon protection: referenced and used as radon barrier in product documentation and certifications.


Related guides
  • What Is a Vapour Control Layer? | VCL Explained
  • My Builder Forgot the Vapour Control Layer? Here’s How to Fix It
  • What is Airtightness (and Why It Matters for Net Zero Buildings)

VIDEO

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Passive Purple

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.