How to ensure a robust, compliant, and safe flat roof system specification

The Independent Review of Building Regulations and Fire Safety, known as the Hackitt Review, has led to increased attention on fire safety. While much of this has been focused on high-rise residential properties, it is crucial that the specification of all building materials and systems in-situ adhere to current fire regulations and ensure the safety of building occupants.

This White Paper, supported by Zurich, looks to discuss one of the key sources of regulation and guidance in England - Approved Document B (Fire Safety) of the Building Regulations. In particular section B4, which relates to the resistance to the spread of fire from an external source, as well as, resistance to a fire spreading across the roof.

It then discusses the two main tests to comply with for flat roof construction, the National Test (BS 476 Part 3) or the European Test BS EN 13501-5 Standards.

Followed by identifying issues around the product and/or system specifications, some of which is highlighted in the Hackitt Review, which states: “reduced scope for substitution of any products or materials used as part of a system without further full testing”. Ultimately, if a component of a system build-up is substituted there is a need for full testing to then take place – it is dangerous to assume that the system will still perform as originally expected with a different combination of components. In the case of flat roofing, if the insulation is changed in some way, whether thickness and/or type, this may invalidate not only the guarantee provided by independent insurers but the classification provided to meet the required Building Regulations.

The White Paper contains the following sections:

·         Regulations

·         Boundaries and minimum distances

·         What is Broof(t4) classification

·         Fire performance of materials

·         The risks of non-compliance

·         Specifying the correct system

·         Ensuring a compliant system

·         The future of certification and compliance

To download the White Paper, click here.


Langley also has a corresponding in-depth online CPD seminar focusing on Building Regulations and Fire Safety including visually impactful situations of non-compliance titled; ‘Mitigating Fire Risks in Flat Roofing’.

The CPD seminar is suitable for Principle Designers, Architects, Specifiers, Facility and Premises Managers, Estate Managers, Clerk of Works, Contractors, Local Authorities and other decision-makers.

To register and download more information on the seminar, click here. 

To book, please contact Cassey Smith; Business Development Co-ordinator on 07591 954885 or email [email protected]

Or, for further information and general enquiries, email [email protected]

Further Information

Find out more about our roofing services by calling us on 01327 704778 or emailing us at [email protected]

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