Can Recycled Materials Meet Passive Fire Protection Standards?

1. Regulatory Framework in the UK

Key regulations and guidance

• In England (and similarly in Wales and Northern Ireland), fire safety of buildings is regulated by Building Regulations 2010 (for new builds and material changes) and the guidance under it. For fire safety, the relevant part is Part B (Fire Safety).

• The official guidance is given in Approved Document B (Fire Safety) (Volumes 1 for dwellings and 2 for other buildings).

• Approved Document B sets out requirements such as: limiting spread of fire on internal lining materials (Requirement B2), fire resistance of structural elements (Requirement B3), and external fire spread (Requirement B4).

• There are also referenced standards: e.g., classification of materials’ reaction to fire (e.g., Euroclass A1, A2, B, etc), and fire resistance tests (e.g., for fire-separating elements).

What this means for materials

• Any material used as part of a passive fire protection system must be appropriate in its performance: for example, if a board is used for compartmentation or fire-resisting lining it must achieve the fire-resistance or reaction-to-fire classification required for that building type and use.

• The guidance in Approved Document B is specific about performance rather than prescribing specific materials. It states that if an alternate approach is used (i.e., not exactly the guidance text) then the overall level of safety must not be lower than what the guidance provides.

• Therefore if a recycled material is proposed, it must demonstrate that it meets the standard performance (e.g., reaction to fire, fire resistance, structural integrity) for the given application.

2. Recycled Materials and Passive Fire Protection: Opportunities & Considerations

Opportunities

• Sustainability drivers: The construction industry is under increasing pressure to reduce embodied carbon, use more recycled content, minimise waste, and adopt circular economy principles. Some manufacturers are developing fire protection materials that incorporate more sustainable or recycled content, or that are designed with recyclability or low-VOC/emissions in mind.

• If a recycled material can be made to meet the required fire performance standards, then it is entirely possible to use it in passive fire protection. For example, the blog on recycled wood/HDPE composite cladding materials shows that recycled content materials can achieve Euroclass B s2-d0 ratings.

Key considerations / Challenges

• Reaction to fire classification: Recycled materials (especially if they include plastics or composites) may behave differently under fire (melting, dripping, flame spread) than traditional non-combustible materials (e.g., certain mineral boards). Meeting the required Euroclass or other classification may be more challenging.

• Fire resistance (R, E, I values): If the recycled material is used as a structural fire-resisting element (or for compartmentation) the board or system must maintain integrity, insulation and/or loadbearing for the specified time. Many recycled content boards may not have been tested to these fire resistance times.

• Quality control and consistency: Recycled materials often have more variability in their composition and properties. For fire protection applications, consistency of performance is crucial.

• Certification and test evidence: Materials must be supported by appropriate fire performance test data (i.e., third-party test reports or certifications) to demonstrate compliance with relevant standard. Without this, building control may not accept the product.

• Regulatory caution on combustibility: External walls, cladding and insulation have seen increased regulatory scrutiny for combustibility in the UK (post-Grenfell etc). Using materialswith recycled content must still satisfy the combustibility and fire spread requirements for external systems.

• Lifecycle / durability: Passive fire protection systems are expected to remain effective for the design life of the building with minimal maintenance. The performance of recycled materials under long-term fire exposure or degradation must be considered. Blogs in the industry emphasise that durability is a form of sustainability.

3. Practical Pathway: Can Recycled Materials Meet Passive Fire Protection Standards?

Yes – they can – but only if the following steps are adhered to:

Step 1: Define the fire protection requirement

• Determine what the role of the material is (lining, partition, structural fire resistance, cavity barrier, cladding etc).

• Identify the relevant requirement in Approved Document B (or other applicable guidance) – e.g., reaction to fire class needed, fire resistance time, combustibility criteria, etc.

• Ensure you understand the building use, height, escape routes etc (which may influence the fire-safety requirement).

Step 2: Verify the recycled material’s performance

• Check whether the recycled material has been tested to appropriate standards: fire resistance tests (e.g., EN 13501-2, BS 476 etc) or reaction to fire tests (EN 13501-1) depending on application.

• Confirm that the classification is adequate (e.g., Euroclass A1 or A2 for non-combustible, or B or C depending on the application). For boards used internally, reaction to fire classification is key. For structural elements, fire resistance (e.g., EI60, EI90) may be required.

• Check traceability and clearly documented product specification: the recycled material must perform the same as whichever material was tested.

• Check durability, fixings, system compatibility (i.e., joints, penetrations, fixings, compatibility with adjacent materials). As one article states, a board alone cannot stop a fire – fixings, joints, and installation quality matter.

Step 3: Integration into the passive fire protection system

• Ensure that the recycled material is part of a tested or appropriately designed fire protection system (compartmentation, fire-stopping, cavity barriers) rather than just a material alone. The system may need to be tested as a whole.

• Make sure the installation is performed to the manufacturer’s instructions and with the correct detailing (e.g., for board fixings, joint seals, interface with service penetration) so that the performance is realised on site.

• Consider the maintenance, inspection and record-keeping (the “Golden Thread” of fire safety) so that the life-cycle of the material and system is maintained.

Step 4: Getting acceptance and regulatory approval

• Provide the building control or relevant authority with the test evidence, classification certificates, installation instructions, and maintenance guidance.

• If the material is novel (i.e., a recycled variant with limited track record) you may need to adopt an engineered alternative approach rather than simply relying on the prescriptive route of Approved Document B. Since Approved Document B states that alternative approaches are acceptable if they deliver the same overall safety. Ensure that the specification documents, drawings and fire strategy explicitly record the use of such materials (so future owners/inspectors know what has been installed).

4. Summary & Key Takeaways

• Using recycled materials for passive fire protection in the UK is feasible – provided they meet the required fire performance (reaction to fire, fire resistance, combustibility) and are properly tested, specified and installed.

• The regulatory framework (Building Regulations / Approved Document B) is focused on performance, so recycled content does not automatically exclude a material – but it must be demonstrated to perform.

• Key risks to watch: consistency of recycled material, test evidence, compatibility with system, installation quality, durability and regulatory acceptance.

• From a sustainability point of view, using recycled materials in PFP aligns with broader industry trends (net-zero, circular economy) — but safety must remain paramount. In other words: sustainability and fire safety can work together — but the material must first satisfy the fire performance requirement.

• When specifying or accepting recycled materials for passive fire protection systems, it’s wise to treat them with the same rigour as any other fire-protection product: check test data, classification, traceability, installation, and maintenance.