When replacing or re-covering a flat roof within 6 metres of a boundary, fire safety regulations are a critical consideration. The UK Building Regulations require that flat roofs close to boundaries meet stringent fire performance standards to prevent the spread of fire between buildings. The gold standard for compliance is the BROOF(t4) classification.
What is BROOF(t4) and Why Does It Matter?
BROOF(t4) is the highest fire performance rating for roof systems under the European standard BS EN 13501-5, specifically tailored to the UK’s test method (t4). A system achieving BROOF(t4):
Resists fire penetration for at least 60 minutes.
Limits flame spread to less than 0.38 metres.
Ensures burning after flame withdrawal is less than 5 minutes.
This rating allows unrestricted use of the roofing system anywhere on the roof, regardless of its proximity to boundaries, making it essential for compliance when working within 6 metres of a property line.
Why Building Control is Getting Stricter
Following high-profile fire incidents, regulatory bodies are rigorously enforcing fire safety standards for flat roofs. Non-compliance can lead to failed inspections, costly remedial work, and increased risks to property and life. By specifying BROOF(t4) systems as standard, you not only comply with current regulations but also future-proof your projects against evolving fire safety requirements.
Your BROOF(t4) System Options with SOPREMA
One proven way to achieve a BROOF(t4) flat roof system is with the SOPREMA SOPRATORCH SL500, combined with compatible components:
SOPRATORCH SL500: A high-performance bituminous torch-on cap sheet.
Bituminous AVCL: Any air and vapour control layer (AVCL) with a Euroclass reaction to fire rating of Class E or higher.
SOPRATHERM T Insulation: Thermal insulation board, compatible with the system build-up.
Sopravent SLP 300 Underlay: A vented underlay to complete the multi-layer system.
This build-up has been tested and certified to meet BROOF(t4) standards, providing assurance of compliance and safety.
Key Benefits of a BROOF(t4) System
Unrestricted Use: Suitable for all areas of the roof, including those within 6m of a boundary.
Regulatory Compliance: Meets and exceeds current Building Regulations for external fire performance.
Peace of Mind: Reduces fire risk and ensures safety for occupants and neighbouring properties.
Future-Proofing: Anticipates stricter enforcement and changes to fire regulations.
Stay Ahead with BROOF(t4) Compliance at Roofbase
Building control is becoming more vigilant in the enforcement of flat roof fire regulations, making compliance with BROOF(t4) systems more important than ever. By getting ahead of these regulations and making BROOF(t4) your standard flat roof solution, you ensure your projects are fully compliant, reduce risk, and future-proof your work against evolving fire safety standards.
Choose Roofbase for reliable supply of certified SOPREMA BROOF(t4) systems and build with confidence, knowing your flat roof projects meet the highest standards for fire safety and regulatory compliance.
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