FlameOut Block Class A Vapour Control Layer – 1.5m x 50m

FlameOut Block Class A Vapour Control Layer is a high-performance fire-rated air and vapour control layer (AVCL) with an A2-s1,d0 reaction to fire classification.

Designed for building envelope applications where enhanced fire performance is required, FlameOut Block is manufactured using a woven glass reinforcement scrim with an aluminium layer, which is protected against corrosion by a specialist lacquer.

The membrane combines vapour control, airtightness and enhanced fire performance, helping prevent moisture from reaching insulation while restricting uncontrolled air movement through the building envelope.

FlameOut Block is particularly suited to higher-risk and high-rise building applications, including buildings over 18m in England and Wales and over 11m in Scotland, subject to the requirements of the individual project and applicable Building Regulations.

Supplied in a 1.5m x 50m roll, each roll provides up to 75m² of coverage.

What is FlameOut Block Class A Used For?

FlameOut Block is designed for use as a fire-rated air and vapour control layer within suitable roof and wall constructions.

Typical applications include:

• High-rise buildings
• Higher-risk building projects
• External wall constructions
• Insulated wall systems
• Roof constructions
• Commercial developments
• Residential developments
• Projects requiring enhanced membrane fire performance
• Airtightness applications
• Vapour and condensation control systems

Its A2-s1,d0 classification makes FlameOut Block particularly suitable where the fire performance of materials incorporated within the building envelope is a critical specification requirement.

A2-s1,d0 Fire Rated Vapour Control Layer

A key feature of FlameOut Block is its A2-s1,d0 reaction to fire classification.

The membrane has been independently tested to EN 13501-1, providing a high level of fire performance for an air and vapour control membrane.

This makes FlameOut Block a specialist alternative to conventional combustible polyethylene-based vapour control layers on projects where enhanced reaction-to-fire performance is required.

Suitable for High-Rise Building Applications

FlameOut Block is especially suited to building envelope applications on buildings over 18m, or over 11m in Scotland, where the fire performance of construction materials can be subject to additional regulatory requirements.

The membrane is designed to support specifications requiring compliance with the relevant requirements of UK Building Regulations Approved Document B.

The exact membrane and system requirements should always be determined according to the building type, height, location and individual project specification.

Air and Vapour Control Layer

FlameOut Block performs as both an air barrier and vapour control layer, helping manage two important aspects of building envelope performance.

As a vapour control layer, it helps restrict the movement of moisture-laden internal air towards the insulation and colder areas of the construction. This helps reduce the potential for interstitial condensation within the building envelope.

As an air barrier, the membrane helps restrict uncontrolled air leakage, supporting the creation of a continuous airtight layer when joints, overlaps, penetrations and perimeter details are correctly sealed.

Helps Improve Building Airtightness

An effective air barrier helps ensure that ventilation through the building envelope can be properly controlled rather than allowing uncontrolled air leakage through gaps within the construction.

FlameOut Block helps improve building airtightness and reduce unwanted heat loss, contributing towards energy-efficient building envelope design and compliance strategies associated with Building Regulations Part L.

For optimum performance, continuity of the membrane should be maintained throughout the installation, including at joints, laps, penetrations and junctions with adjoining building elements.

Helps Protect Insulation Against Moisture

Warm internal air contains moisture which can migrate through the building construction. If this moisture reaches colder areas within an insulated wall or roof, it can condense within the building fabric.

FlameOut Block acts as a vapour barrier, restricting moisture movement towards the insulation and helping reduce the risk of interstitial condensation.

Effective vapour control can help protect insulation and other building components while supporting the long-term performance of the building envelope.

Reinforced Glass Scrim Construction

Rather than using conventional polyethylene construction, FlameOut Block incorporates a woven glass reinforcement scrim with an aluminium layer.

The reinforcement scrim provides excellent tensile strength, creating a robust membrane suitable for professional building envelope installations.

The aluminium layer is also protected against corrosion with a specialist lacquer, helping maintain the integrity of the membrane within its intended application.

Seal with FlameOut System Tapes

Correct sealing is essential for maintaining continuity across a FlameOut Block AVCL installation.

The membrane should be installed using compatible FlameOut Double Sided Tape and FlameOut Aluminium FR Tape to seal appropriate joints, overlaps and details.

Using the specified FlameOut accessories helps create a continuous air and vapour control layer while maintaining compatibility across the complete membrane system.

Key Features and Benefits

• A2-s1,d0 fire classification: Provides enhanced reaction-to-fire performance
• Fire-rated AVCL: Combines fire performance with air and vapour control
• Independently tested: Tested to EN 13501-1
• Suitable for high-rise applications: Especially suited to 18m+ buildings and 11m+ buildings in Scotland, subject to project requirements
• Approved Document B applications: Designed for specifications requiring enhanced building envelope fire performance
• Air and vapour control: Combines airtightness and vapour control within a single membrane
• Helps protect insulation: Restricts moisture from reaching insulation within the building envelope
• Improves airtightness: Helps reduce uncontrolled air leakage
• Helps reduce heat loss: Supports energy-efficient building envelope design
• Part L applications: Can contribute towards airtightness strategies associated with Building Regulations Part L
• Woven glass reinforcement: Provides excellent tensile strength
• Aluminium layer: Provides the membrane’s specialist vapour control construction
• Corrosion protected: Aluminium layer protected with a specialist lacquer
• CE approved: Suitable for professionally specified construction applications
• Compatible system accessories: Designed for use with FlameOut Double Sided Tape and Aluminium FR Tape
• Large roll coverage: Each 1.5m x 50m roll provides up to 75m²

FlameOut Block Class A Product Specification

Why Choose FlameOut Block Class A?

FlameOut Block Class A Vapour Control Layer provides a specialist solution for building envelope projects requiring the combined benefits of enhanced fire performance, vapour control and airtightness.

Its A2-s1,d0 reaction to fire classification, independently tested to EN 13501-1, makes it particularly suited to high-rise and other projects where conventional combustible vapour control membranes may not meet the required specification.

The reinforced woven glass scrim provides excellent tensile strength, while the corrosion-protected aluminium layer creates an effective vapour barrier that helps prevent moisture from reaching insulation.

When correctly installed and sealed using compatible FlameOut Double Sided Tape and FlameOut Aluminium FR Tape, FlameOut Block can form a continuous air and vapour control layer that helps improve airtightness, control moisture movement and minimise uncontrolled heat loss.

Each 1.5m x 50m roll provides up to 75m² of coverage, making FlameOut Block a high-performance AVCL solution for demanding residential and commercial building envelope applications.