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Leak-proofing paint PASSIVE PURPLE BRUSHprotectiveindooroutdoor
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Characteristics
- Function
- protective, leak-proofing
- Location
- outdoor, indoor
- Application
- for wall, for ceiling, for floor, for window, for indoor air quality
- Support
- for wood, for concrete, for bricks
- Component
- water-based
- Color
- purple
- Options
- fire-resistant
- Number of coats
- one coat
- Ecological characteristics
- low VOC
Description
What is Passive Purple Brush?
Where is it used?
Why use the Brush version?
Surface preparation
Application & coverage
Why airtightness matters
Tested & certified (summary)
Uses & compatible substrates
Technical characteristics / specifications
- Passive Purple Brush is a fibre-reinforced, brush-applied airtight membrane for detailed airtightness work. It forms a permanent, seamless vapour-control layer suitable for sealing gaps and penetrations where spraying or rolling is impractical.
Where is it used?
- Service penetrations (pipes, cables, ducts)
- Window and door frames
- Floor-to-wall and wall-to-ceiling junctions
- Cracks and gaps up to 5 mm
- Touch-ups after air testing or snagging
Why use the Brush version?
- The Brush version contains fibres that bridge and seal larger cracks and irregularities, making it ideal for precision detailing, repairs and finishing work while delivering Passivhaus-certified airtightness.
Surface preparation
- Ensure substrates are solid, dust-free and dry.
- Large gaps (>5 mm): fill with cement-based filler or suitable foam before application.
- Small to medium gaps (2–5 mm): Passive Purple Brush can be applied directly.
Application & coverage
- Apply with a flat paintbrush for accurate placement.
- Designed for small projects, detailing and repair work.
- Once cured, the membrane can be painted, plastered or rendered over.
- Coverage guidance: approximately 1 kg per 1 m² (approximate; depends on joint geometry).
Why airtightness matters
- Uncontrolled air leakage reduces energy performance and increases heating/cooling demand.
- Leaks can cause draughts, moisture accumulation and mould risk.
- Poor airtightness may compromise Passivhaus targets and building-regulation compliance.
Tested & certified (summary)
- Independent testing and ICC-ES evaluation (ESR-4715) as part of the Passive Purple system.
- French A+ indoor-air rating & Finnish M1 class — very low VOC emissions (EN 16516 / RTS).
- Passive House Institute Class A airtight — 0.02 m³/h·m² @ 50 Pa (EN 12114).
- Air barrier material — air leakage 0.02 L/s·m² at 75 Pa (ASTM E2178).
- Reaction to fire — Class A to ASTM E84 (Flame Spread 0, Smoke 35); Euroclass C-s1,d0 to EN 13501-1 (B-s1,d0 when combined with specified fire-retardant where noted).
- Watertight (EN 14891) & intelligent vapour control (EN ISO 12572).
- Strong adhesion across substrates (EN ISO 4624) & 10/10 mould resistance (ASTM D3273).
- ICC-ES ESR-4715, Passivhaus certified & BBA approved for the system.
Uses & compatible substrates
- Concrete
- Brick
- Wood
- Floor/wall connections
- Ceiling connections
- Vertical and horizontal joints
Technical characteristics / specifications
- Product collection: Passive Purple
- Applied by: Brush
- Colour: Purple
- Pack sizes (example): 3.7 kg (unavailable), 6.9 kg (selected)
- Coverage: ~1 kg per m² (guidance)
- Fibre-reinforced formula — bridges cracks and gaps up to 5 mm
- Permanent, seamless vapour-control layer — can be overplastered/painted/rendered after cure
- Water-based, low VOC — suitable for internal use
- Passivhaus-certified airtight product; ICC-ES and BBA accredited as part of the Passive Purple system
- Reaction to mould growth: tested and rated (see technical documentation)
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*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.