Fire Performance Testing and Extended Application (EXAP) – Sika Roofing Responding to Evolving Fire Safety Requirements
In response to increasing demand from architects, clients, building control officers, and other specifiers for fire test certification that reflects the exact roofing system being installed, Sika Roofing has expanded its fire testing programme to include Extended Application Assessments (EXAP) to CEN/TS 16459.
This approach supports regulatory compliance and helps stakeholders make informed decisions based on verified performance data.
Regulatory Context
Current UK regulations require roofing systems to be classified to BS EN 13501-5 BROOF(t4). Exceptions apply to certain building attachments, particularly on structures exceeding 11m, where insulation must be non-combustible.
Due to the wide variety of roof build-ups, achieving clarity in fire performance can be complex. Sika has addressed this by commissioning third-party testing and classification to cover a broad range of system permutations.
Sika's Approach to Testing
Sika has worked with a range of UKAS Accredited Fire Test Laboratories to conduct testing in accordance with:
- CEN/TS 1187 – the standard for external fire exposure of roofs.
- EN 13501-5 – the classification standard for fire performance.
- CEN/TS 16459 – the methodology for extended application of test results.
The CEN/TS 16459 standard (EXAP) enables classification of multiple system combinations while maintaining rigorous testing standards. EXAP is not a shortcut—it requires physical testing and must meet strict criteria before extrapolation is permitted.
Fire Performance Classification Overview
Sika Roofing systems have been tested in accordance with CEN/TS 1187 and classified under EN 13501-5, the European standard for evaluating the fire performance of roof coverings. These standards form the basis of our third-party certifications, which include BROOF(t4) classification for specific flat and pitched roof configurations using single-ply, bituminous, and liquid-applied membranes.
In addition to direct testing of specific roof assemblies, Sika utilises Extended Application Assessments (EXAP) to support coverage across a range of various warm roof build-ups and system combinations. These assessments are based on test evidence and published rules, helping to extend the scope of our fire classification documentation.
Due to the diversity of roof constructions and project-specific variables, we strongly encourage that you contact the Sika Roofing Technical Department to confirm the applicable fire classification for any proposed system. Traceable certification documents are available upon request.
Supporting Specifiers and Stakeholders
By investing in comprehensive fire testing and certification, Sika enables specifiers, building owners, and insurers to:
- Confirm compliance with fire regulations.
- Access verified performance data for specific system configurations.
- Reduce uncertainty in fire safety assessments.
This initiative reflects Sika’s commitment to supporting safe roofing design and installation through transparent and evidence-based product information.
Fire Performance Considerations in Roof Refurbishment Projects
Demonstrating fire performance in refurbishment projects presents specific challenges. Existing roof systems may lack comprehensive documentation, and their condition can be affected by age, prior repairs, or weathering—making it difficult to replicate fire test conditions with precision.
While extended application assessments may not be available for every refurbishment scenario, classification reports for tested insulated build-ups achieving BROOF(t4) indicate that fire spread can be limited within the insulation layer, subject to the specific configuration tested.
The individual responsible for ensuring regulatory compliance in relation to fire performance should base decisions on available test evidence and technical assessments. In cases where existing roof build-ups cannot be reliably characterised, and current test data does not directly apply, a full removal and reconstruction using a configuration classified to BROOF(t4) may be preferable to demonstrate alignment with applicable fire performance criteria.
CPD: Fire Safety in Roofing Systems
Sika offers a Continuing Professional Development (CPD) module titled: “Fire Regulation & Test Methods for Roofs”
Topics covered include:
- UK Building Regulations and fire standards.
- Roof insulation types and fire classifications.
- EXAP methodology and BROOF(t4) classification.
- Sika’s fire test portfolio and roofing systems.
- CCPI compliance and design considerations.
This CPD is designed to help professionals navigate the complexities of fire safety in roofing and understand the role of verified product information.
""“The market has become acutely aware of fire safety and it is looking to Sika to help. We have seen for a while now that specifiers, architects, clients and building control are increasingly insisting on fire test certificates that directly reflect the exact system being installed. As it is very problematic to test every single permutation of a system, when you factor in multiple substrate types, insulation thickness and membrane type/thicknesses, EXAP testing through an independent body allows us to cover most variations of the system being installed. With Sika Single-Ply roof systems classified as BROOF(t4), we’re able to demonstrate and facilitate regulatory compliance for fire safety and satisfy current market demand."" Dean Grady - Senior Product Engineer