BROOF (t4)
BROOF(t4) refers to the highest fire rating classification for roofs according to the European classification system BS EN 13501-5 since the national classification system BS 476-3:2004 no longer applied after 2019 and the new Approved Regulations Part B. The test indicates that the roof system prevents fire penetration for at least 60 minutes resistance to external fire spread, penetration, and burning droplets and is essential for compliance in UK building regulations, often required for flat roofs, terraces, and high-rise developments.
- No penetration of roof system within 60 minutes
- In preliminary test, after withdrawal of the test flame, specimens burn for less than 5 minutes
- In preliminary test, flame spread less than 0.38 m across region of burning
[edit] Related articles on Designing Buildings
- Blue roof.
- Cold roof.
- Designing out fire risk in roof voids.
- Existing guidance on fire compartmentation in roof voids.
- Flat roof.
- Green roof.
- Metal roofing.
- Pitched roof.
- Shingle roofing.
- Slate roofing.
- Solar panels, pitched roofs and risk of fire spread.
- Tile roofing.
- Thatch roofing.
- Types of roof.
- Warm roof.
Featured articles and news
Costs and insolvencies mount for SMEs, despite growth
Construction sector under insolvency and wage bill pressure in part linked to National Insurance, says report.
The place for vitrified clay pipes in modern infrastructure
Why vitrified clay pipes are reclaiming their role in built projects.
Research by construction PR consultancy LMC published.
Roles and responsibilities of domestic clients
ACA Safety in Construction guide for domestic clients.
Fire door compliance in UK commercial buildings
Architect and manufacturer gives their low down.
Plumbing and heating for sustainability in new properties
Technical Engineer runs through changes in regulations, innovations in materials, and product systems.
Awareness of the Carbon Border Adjustment Mechanism
What CBAM is and what to do about it.
The new towns and strategic environmental assessments
12 locations of the New Towns Taskforce reduced to 7 within the new towns draft programme and open consultation.
Buildings that changed the future of architecture. Book review.
The Sustainability Pathfinder© Handbook
Built environment agency launches free Pathfinder© tool to help businesses progress sustainability strategies.
Government outcome to the late payment consultation, ECA reacts.
IHBC 2025 Gus Astley Student Award winners
Work on the role of hewing in UK historic conservation a win for Jack Parker of Oxford Brookes University.
Future Homes Building Standards and plug-in solar
Parts F and L amendments, the availability of solar panels and industry responses.
How later living housing can help solve the housing crisis
Unlocking homes, unlocking lives.
Preparing safety case reports for HRBs under the BSA
A new practical guide to preparing structural inputs for safety cases and safety case reports published by IStructE.
Male construction workers and prostate cancer
CIOB and Prostate Cancer UK encourage awareness of prostate cancer risks, and what to do about it.