Airtight White - Vapour Control, Airtight & Smoke Tight Paint (11.4kg) - Spray / Roller Applied

Why Choose Passive Purple Airtight White?

Passive Purple Airtight White is a high-performance liquid airtight vapour control membrane, engineered for projects where airtightness, safety, and sustainability matter most. Certified, tested, and trusted across the industry, it delivers the ultimate balance of speed, protection, and reliability.

• Certified Performance – Fully BBA Certified and Passivhaus Certified, Airtight White meets the toughest standards for airtightness and building integrity.
• Underground Gases Protection – Airtight White doubles as a radon and methane barrier, safeguarding your building from harmful ground gases and ensuring a healthier indoor environment.
• Fast Application, Lower Labour Costs – With airless spray application, a single installer can cover up to 300m² per day, dramatically speeding up build times and reducing costs.
• Safe & Sustainable – Rated M1 Class and completely VOC-free, Airtight White is water-based, free from harmful chemicals, and safe for both users and the environment.
• Fire Safety Advantage – Unlike paper membranes (Class E), Airtight White achieves a Fire Class C rating, giving your project a higher level of built-in fire protection.
• Proven Airtightness – With airtightness results of 0.6 ACH and below, Airtight White helps you achieve Passivhaus standards with confidence – whether you’re aiming for certification or simply building to a higher energy efficiency level.

Passive Purple Airtight White is the smart choice for builders, architects, and retrofit specialists who need a certified, safe, and high-performance airtight membrane that goes beyond traditional tapes and foils.

Airtight White – Spray or Roll for a Seamless Finish

Passive Purple Airtight White is a liquid-applied airtight vapour control membrane designed for projects where airtightness must be achieved without compromising appearance. Applied by airless spray or roller, it creates a smooth, white finish that can be left on show — making it ideal for retrofit projects, heritage buildings, and internal spaces where a clean look is required.

Why Airtight White?

• Retrofit Ready – Perfect for upgrading existing buildings without the need to strip back walls.
• On-Show Finish – The white coating blends seamlessly into interiors, making it suitable where airtight layers remain visible.
• Fast Coverage – Up to 300m² per day can be applied by one installer using spray, or easily rolled on smaller projects.
• Certified Protection – BBA Certified, Passivhaus Certified, and tested as a radon barrier for complete performance peace of mind.
• Healthy & Safe – M1 Class, VOC-free, water-based, with zero harmful chemicals.
• Fire Resistance – Achieves Fire Class C, outperforming traditional membranes.

Where It Works Best

Airtight White is designed for:

• Internal retrofit airtightness upgrades
• Areas where white needs to be left exposed (lofts, basements, services zones, car parks, lift shafts, stair wells or plant rooms)
• Floor, wall, and ceilings
• Vertical and horizontal areas
• Service penetrations when paired with Airtight White Brush for detailing

Whether sprayed for large-scale speed or rolled for smaller retrofit projects, Airtight White delivers a seamless, durable, and attractive airtight layer that protects energy performance while looking good enough to leave uncovered.

Product Collection:Passive Purple
Applied By:Spray or Roller
Colour:White
Size:11.4kg
Certification:BS Fire Class C|EN 13501-1:2018, cl. 11

Coverage
OSB: 13 – 14 Sqm

KEY POINTS:

• Passivhaus certified
• BBA certified
• M1 class, voc free (volatile organic compound)
• Fire class c
• Up to 300m2 a day per operative
• 0.03ach (air changes per hour)
• Adheres to any substrate
• Radon & Methane barrier

Airtight White - Technical Data Sheet (TDS)

Airtight White - Install Guide

Airtight White - Safety Data Sheet (SDS)

BBA Certificate - Airtight White

Passivhaus Institute Certificate - Airtight White

Radon Certificate - Airtight white

Methane Certificate - Airtight White

Resistance To Mould Growth - Airtight White

Reaction To Fire - Airtight White

Reaction To Fire - Airtight White + FRED

SD Card - Airtight White

EPD Certificate - Airtight White

M1 Class- Airtight White