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Airtight White Brush: High-Performance Airtight Membrane for Internal Vapour Control - Brush-applied Liquid Airtight Membrane

Name: Airtight White Brush: High-Performance Airtight Membrane for Internal Vapour Control - Brush-applied Liquid Airtight Membrane
Brand: Intelligent Membranes
SKU: 6eZpmeUXpcy3EgkFW8chLU

Verified by manufacturer 3 days ago

Intelligent Membranes

Product certifications:

BBA Agrément Certificate
Certificate type
BBA Agrément Certificate
Certificate type

Airtight White Brush is a fibre-reinforced liquid membrane for precise airtight detailing. Brush-applied, it seals penetrations, junctions, and connections to ensure continuous airtightness.

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+44 (0)1223 208174 Website

Application

Product Application – Airtight White Brush

The Airtight White Brush is applied with a standard brush in one or two coats, depending on the detail. Once cured, it forms a strong, seamless airtight barrier ideal for sealing complex junctions and penetrations.

Directions for Use

Preparation
- Remove dust, grease, loose material, and standing water.
- Ensure substrates are clean, sound, and closed.
- Fill large gaps or holes with a suitable cement-based filler or polyurethane foam before application.
Application
- Apply directly with a brush, working into corners, joints, and penetrations.
- For larger gaps or where reinforcement is required, apply two coats.
- Allow the first coat to dry before applying the second.
Conditions
- Apply only when the substrate and ambient temperature are above 5°C.
- Application is permitted on slightly humid surfaces, but remove any standing water.
Aftercare
- Clean tools with water immediately after use.
- Once cured, the coating provides long-term airtight detailing protection.

Key Benefits During Application

Simple, precise brush application
Fibre-reinforced for reliable gap bridging
Ideal for airtight continuity at tricky details

Typical Application Areas

Floor-to-wall connections
Wall-to-ceiling connections
Window-to-wall junctions
Pipe and service penetrations
Wall-to-wall connections
Vertical and horizontal joints
Curtain wall interfaces
Wall-to-roof connections (including steel deck)

Description

Airtight White Brush

The Airtight White Brush is a fibre-reinforced liquid-applied membrane, designed for precise airtight detailing where spray application is not suitable. Applied with a brush, it forms a durable, seamless barrier that eliminates uncontrolled air leakage.

Key Features

Brush-applied for accurate airtight sealing around difficult details
Fibre-reinforced to bridge small gaps, cracks, and junctions
Creates a continuous airtight layer across connections and penetrations
Strong adhesion to most building substrates
VOC-free and safe to use on site

Ideal Applications

Window and door junctions
Service and pipe penetrations
Corners, joints, and connections
Retrofit and heritage airtight detailing

The Airtight White Brush ensures every critical junction is sealed, delivering airtight continuity and helping buildings meet the most demanding airtightness standards.

General information

Color	White
Finish	Other
Material	Polymer
Shape	Formless
Length	Bespoke
Width	Bespoke
Height	Bespoke
Warranty description	Lifetime

Uniclass	Pr_25_57_65_60 Plastics sheetsPrimary
CAWS	J41/395 Air and vapour control layer J42/395 Air and vapour control layer J21/395 Air and vapour control layer J31/330 Air and vapour control layer H30/261 Air and vapour control membrane H31/261 Air and vapour control membrane H11/785 Air and vapour control layer P10/60 Air and vapour control layer P10/310 Air and vapour control layer H30/30 Air and vapour control membrane H92/780 Air and vapour control layer

SKU Code	IM/00AWB/5

Product range	Methane and Radon Barrier Vapour Control - Air barrier / Internal

Specification data - Plastics sheets

Classification data
Product reference	Airtight White Brush: High-Performance Airtight Membrane for Internal Vapour Control.
Material	Water-based polymer. Manufacturer guidance Manufacturer's standard.
Purpose	Airtight vapour control membrane.
Standard	To BS EN ISO 12572, BS EN 12114, BS EN ISO 11925-2 and BS EN ISO 4624.
Third-party certification	To EOTA TR008.
Performance characteristics	-
Tensile strength (minimum)	42 N/50 mm². Flatwise tensile strength to ASTM C0297-16, all substrates met ICC-ES AC212 criteria for acceptance.
Tear resistance	EOTA TR008, Pass. Guidance for specification option: Resistance to fatigue movement. Manufacturer guidance Resistance to fatigue movement.
Elongation to break	To BS EN ISO 527-3, 262.7%. Manufacturer guidance Elongation after ageing.
Resistant to underground gases	- Manufacturer guidance Consult manufacturer for more details and insert requirements.
Water vapour resistance (minimum)	114.5 MN·s/g. μ-value to EN ISO 12572, 35967. Sd-value to EN ISO 12572, 11.5 (at 0.32 mm dry thickness); 17.3 (at 0.48 mm dry thickness).
Fire performance	Flame propagation and fire reaction to EN ISO 11925, Pass, <150 mm. Guidance for specification option: Flame propagation Manufacturer guidance Fire reaction (to EN ISO 11925-2): No.
UV stabilization	- Manufacturer guidance Consult manufacturer for more details and insert requirements.
Environmental performance requirements	-
Environmental rating	Passivhaus certified score of 0.03 ACH. Class M1, VOC free (volatile organic compound).
Volatile organic compounds (VOC) emissions level (maximum)	To EN ISO 16000-9/ 6, EN 717-1 and EN 180 16000-28, free from VOC.
Recycled content As defined in clause 7.8 of BS EN ISO 14021	0%. Manufacturer guidance Grinded as solid film in plastics.
Form	Liquid.
Root inhibitor	- Manufacturer guidance Consult manufacturer.
Physical properties	-
Colour	Purple. White.
Weight (minimum)	1.15 kg/L. Manufacturer guidance Density.
Drying time	4–48 hours. Guidance for specification option: Depending on substrate temperature, air, humidity, applied layer thickness and ventilation.
Adhesion	Adhesion on red brick (dry or moist): to ISO 4624, >1 N/mm². Adhesion on concrete brick (dry or moist): to ISO 4624, >1 N/mm². Adhesion on calcium silicate stone (dry or moist): to ISO 4624, adhesion value exceeding substrate strength. Adhesion on polyvinyl chloride (PVC): to ISO 4624, 0.8 N/mm². Adhesion on aluminium: >1 N/mm². Adhesion on ethylene propylene diene monomer (EPDM): >1 N/mm². Adhesion on roofing: adhesion value exceeding substrate strength. Adhesion of spray plaster on Passive Purple Brush: adhesion value exceeding substrate strength. Guidance for specification option: Values after artificial ageing of sample membrane
Water penetration	To ASTM E331, all substrate meet ICC-ES AC212 criteria for acceptance. Manufacturer guidance Water spray/ rain penetration.
Watertightness	To ISO 4624, Pass. Guidance for specification option: Values after artificial ageing of sample membrane.
Application temperature	>5°C.
Dangerous substances	To EN ISO 16000-9/ 6, EN 717-1 and EN 180 16000-28, free from carcinogenics, ammonia and formaldehyde.
Consumption (per layer applied)	0.5-1 kg/m². Guidance for specification option: Depending on substrate.

Sustainability data

Contains Red List materials	No
Country of material origin	Europe
Country of product manufacture	Europe
Material	Polymer
Carbon dioxide equivalent
Carbon dioxide equivalent, as defined in BS EN 15804 Self-declared
Stage Normalised unit (kg CO₂ eq/kg) Declared unit (kg CO₂ eq/m²) Stage:A1–A3 ('Production stage') Normalised unit : Declared unit : 0.09 Lower emissions
Recyclability	Not recyclable due to its adhesion to other products
Recycled content As defined in clause 7.8 of BS EN ISO 14021	0 % Guidance for specification option: Grinded as solid film in plastics.
Expected Life	Lifetime