Fire Rated Membranes | Compliant Solutions | illbruck UK

Discover illbruck’s fire rated membranes designed for external wall applications across the UK & Ireland. Compliant with EN 13501-1 Class B-s3, d0 & ADB regulations.


Fire Rated Membranes for UK & Ireland Construction Projects

When selecting fire rated membranes for construction projects across the UK and Ireland, architects, specifiers, and main contractors must take extra precautions to ensure the correct system is chosen for its intended function. illbruck offers a comprehensive range of high-performance membranes designed to meet the latest fire safety regulations and building standards.

Compliant with Approved Document B (ADB) & EN 13501-1 Standards

Recent updates to Approved Document B (ADB) now require that any membranes applied to external walls of relevant and in-scope buildings in England must achieve a minimum reaction to fire rating of Class B-s3, d0 in accordance with EN 13501-1. This ensures enhanced fire performance and regulatory compliance for facade and wall applications.

Membranes Are Not Fire Stops But Must Meet Rigorous Standards

While membranes are not designed to act as fire stopping materials, they must still meet the stringent requirements outlined in ADB and the UK building code of practice. A Class A rating is not required, but Class B-s3, d0 is essential for safety and compliance.

illbruck’s Certified Fire Rated Membrane Systems

As a trusted construction products manufacturer, illbruck provides a range of fire rated breathable membranes and vapour control layers that exceed current building regulations. Each product is independently tested and fully certified, giving specifiers and contractors confidence in their selection.

Breathable Membranes & Vapour Control Layers for Demanding Applications

illbruck’s membrane systems offer superior weather protection, air leakage control, and fire safety performance. Whether used in high-rise buildings, facade systems, or external wall assemblies, our solutions are engineered for demanding environments where fire resistance is critical.

Explore Our Fire Rated Membrane Range

Browse our selection of fire rated membranes, including:

Class A Fire Rated Membranes

  • Class A1 - ME055 FR Breather Membrane
  • Class A1 - ME060 FR AVCL Membrane

Class B Fire Rated Membranes

  • Class B - ME007 FR Window & Door Sealing Membrane
  • Class B - ME006 FR AVCL Membrane

Fire Rated Sealants

  • Class B - SP025 Fire Membrane Adhesive

Each product is designed to support safe, compliant, and efficient building envelope design.

Frequently Asked Questions

What fire rating do illbruck membranes achieve?
All illbruck fire rated membranes meet or exceed Class B-s3, d0 under EN 13501-1.

Are these membranes suitable for high-rise buildings?
Yes, they are designed for use in ADB-compliant external wall systems, including high-rise and in-scope buildings.

Can I use these membranes with illbruck adhesives?
Absolutely. Products like SP025 Fire Membrane Adhesive are formulated to work seamlessly with our membrane systems.

Fire Rated Membranes - In Practice


Ensuring the challenge of delivering a fit for purpose fire rated membrane is achieved, requires a variety of solutions tailored to meet the individual project requirements. Our specification and technical team are on hand to ensure that installation and application of selected fire rated membranes are well matched and successfully installed. 

Explore our project case studies and technical insights for more information. 

Explore our membrane FAQs

Whilst all materials fixed to the external wall have to be non-combustible (Class A1) or of limited combustibility (A2-s1, d0) to EN13501-1, there are certain exemptions including for membranes, which are required to be minimum Class B-s3, d0. illbruck ME010 Façade UV & Fire Membrane achieves Class B-s1, d0 when tested with SP025 Adhesive. Most membranes, including illbruck ME220 (EPDM) and ME501/ME508 (Intelligent) are Class E as are most sealants. More information can be found in our Approved Document B 2019 Fire Safety.

In this case, the sd value should be as high as possible (eg illbruck ME003 has an sd value of 107m) and a minimum vapour resistance of 200 MNs/g.

Breather membranes need to be capable of withstanding driving rain (usually to a minimum of 600 Pa) and by definition need to be vapour permeable and the measurement of this is by reference to the membrane’s vapour resistance (measured in MNs/g – Mega Newton seconds per gram). Another widely used measure is the ‘sd value ’ – this is the equivalent air layer thickness in metres (m). In the case of both measurements, these can only be stated based on the specific thickness of the material. For optimum vapour permeability, the vapour resistance of a membrane should be < 0.6MNs/g.

Specifying Our Products Just Got Easier 


NBS source gives you the ability to specify Illbruck’s products in several workflows. It provides a single source of construction product information presented in a consistent and structured format, enabling architects to find, select and specify products to project workflows.

Explore our range and simply click "add to spec"to start the seamless specification process today. 

Visualise our fire rated membranes in situ...


Explore the below 3D model, which highlights a standard A class membrane configuration behind a brick façade. 

These membranes form part of the only complete range of compliant, tested, and compatible façade building protection products. illbruck's recently launched range of FR membranes ensures that there is a suitable solution for all applications - all available from a single source supplier. Experts in the field of façades, with over 75 years of experience, the illbruck team is on hand to support with your project enquiries or provide on-site technical and installation training where required. 

FR Window & Door Sealing Membrane (ME010)
FR Window & Door Sealing Membrane (ME010) is a vapour permeable polyester, airtight and fully watertight membrane used as a perimeter membrane seal to the external side of glazed units such as windows, doors, and curtain walling.
Find out more
FR Window & Door Sealing Membrane (ME010)
FR Window & Door Sealing Membrane (ME010) is a vapour permeable polyester, airtight and fully watertight membrane used as a perimeter membrane seal to the external side of glazed units such as windows, doors, and curtain walling.
Find out more
FR Breather Membrane ALU (ME050)
ME050 FR Breather Membrane (ALU) is a reflective breather membrane which is A2-s1, d0 in accordance with EN 13501-1 and water resistant to Class W1 in accordance with EN 13859-2.
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Adhesive Tape A2 (ME355)
Self adhesive and reinforced tape with an aluminum face, used to bond and seal membrane joints and overlaps to create a Class A2-s1, d0 system with defined illbruck membranes.
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FR AVCL (ME060)
ME060 is a laminated, aluminium foil faced glass fibre reinforced, air and vapour control membrane with a reaction to fire classification of A2-s1, d0 to EN 13501-1.
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Our support doesn't stop there...


Our specification team are on hand to support at every stage of your construction project and we understand the importance of finding the best value, lowest risk solution which exceeds your project requirements. From on-site support and surveys, as well as a full suite of training courses from the Tremco CPG UK Training Academy, we are here to help you.

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