RIBA Statement on Design for Fire Safety
Starting in the early hours of 14 June 2017 a devastating fire at Grenfell Tower in Kensington, London, caused a significant number of fatalities. This document supplements statements made by the RIBA in the immediate aftermath of the tragedy and provides three new contributions:
Commentary on the regulatory and procurement context
Understandably there has been a lot of media speculation about the causes of the Grenfell Tower fire and the reasons for the huge loss of life, and a desire to seek answers as quickly as possible. The relevant authorities, including the police, will inevitably require some time to complete their investigations and the public inquiry will provide an opportunity for the fullest possible examination. This should be a full public inquiry, with evidence taken under oath and the inquiry able to order witnesses to attend by summons.
However, for a number of years concerns have been raised by RIBA members and other experts about aspects of the regulatory and procurement regime for buildings in the UK. These include:
The RIBA believes that future proposals for the fire safety regulatory regime should be informed by the specialist fire safety expertise of relevant professional organizations and groups, such as the Building Research Establishment (BRE), the Fire Protection Association, the Fire Safety Federation, the Institute of Fire Engineers, the Association of Specialist Fire Protection and the All Party Parliamentary Fire and Rescue Group, and also take full account of this wider set of construction industry regulatory, practice and process issues.
Guidance to RIBA members on fire safety following the fire at Grenfell Tower
Requirements for fire safety are set out in Approved Documents B Vol.1 (Dwellinghouses) and B Vol.2 (Buildings other than Dwellinghouses) of the Building Regulations as appropriate, including means of warning and escape, internal fire spread and compartmentation, external fire spread and access for fire and rescue equipment. For larger, more complex buildings, designs may alternatively conform to BS 9991 Code of Practice for Fire Safety in the Design, Management and Use of Residential Buildings and BS 9999 Code of Practice for Fire Safety in the Design, Management and Use of Buildings. The fire safety options set out in the Approved Documents for compliance with Part B requirements are minimum acceptable solutions.
Section 12 of Approved Document B Vol. 2 covers the design of external walls for fire safety, and includes specific requirements for tall buildings, above 18m. External walls are elements of structure and must meet the relevant period of fire resistance. Section 12 also includes requirements to ensure that the external envelope of the building does not provide a medium for fire spread that is likely to be a risk to health or safety. It sets out requirements for external surfaces, insulation and cavity barriers and the test standards that products and components must meet, as well as the alternative method of demonstrating that the complete proposed external cladding system has been assessed according to the acceptance criteria in BRE report BR 135 'Fire performance of external thermal insulation for walls of multi story buildings' for cladding systems using full scale test data from BS 8418-1:2002 or BS 8414‐2:2005.
In blocks of flats, effective fire compartmentation is crucial to overall fire safety. Requirements for compartment floors, compartment walls and protected shafts (for stairs, lifts, chutes, ducts and pipes) are set out in Section 8 of Approved Document B Vol. 2. Particular care is needed when undertaking works to existing blocks of flats to ensure that compartmentation is maintained.
The role of sprinkler systems in reducing the risk to life is recognized in Approved Document B Vol 2. Even when sprinkler systems are not required in the Approved Document, we recommend that clients consider the benefits of installing sprinkler systems as an additional means of providing life safety. This may be particularly relevant in projects which involve material alterations to existing buildings, where the overall building as whole may not comply fully with all aspects of the current Approved Document B Vol. 2.
The Department for Communities and Local Government (DCLG) issued letters, to all local authority chief executives and housing association chief executives, on 18 June 2017, and to owners, landlords and managers of private residential blocks in England, on 20 June 2017, communicating that in the aftermath of the tragic events at Grenfell Tower, owners and managers of residential tower blocks need to urgently carry out fire safety checks to ensure that appropriate safety and response measures are in place. In particular, it is important to identify whether any high-rise buildings incorporate panels of Aluminum Composite Material (ACM) and if so that the right type of ACM cladding has been used.
Annex A to this letter states that “On buildings with a floor over 18m above ground level, where ACM panels are identified, it is necessary to establish whether the panels are of a type that complies with the Building Regulations guidance, ie the core material should be a material of limited combustibility or class A2. A footnote clarifies: 'Material of limited combustibility as described in Table A7 of Approved Document B (Vol 2); Class A2-s3, d2 or better in accordance with BS EN 13501-1'.
Local authorities and housing associations have been asked to check residential blocks over 18m in height to identify whether they have ACM panels and to submit small samples of the panels for laboratory testing to ensure that they are of limited combustibility.
The letter from DCLG to local authorities and housing associations is available from: https://www.gov.uk/government/publications/safety-checks-following-the-grenfell-tower-fire
DCLG is also offering private owners of residential buildings an opportunity to test cladding on blocks over 18m high through arrangements put in place with the BRE. These checks will be paid for by DCLG, and the information will be available to DCLG from BRE.
Where building owners and managers consider they may have concerns about cladding on buildings over 18m high, they should follow the process defined in the letter from DCLG available from: https://www.gov.uk/government/publications/safety-checks-on-private-residential-blocks
Recommendations to the Government
The RIBA called for a public inquiry in the immediate aftermath of this tragedy and will be calling on our members to provide technical and expert evidence to it. We wish to stress that this should be a full public inquiry, with evidence taken under oath and the inquiry able to order witnesses to attend by summons.
The public inquiry is likely to take some significant time. It would be irresponsible for the RIBA to speculate at this stage about the cause and spread of the Grenfell Tower fire and the reasons for the shocking and distressing level of loss of life.
However, the RIBA believes that certain actions should be commenced in parallel with the public inquiry process. In particular we urge the Government to:
(The design of fire safety in schools is covered by BB 100. Approved Document B states that schools will typically satisfy Part B of the Building Regulations where the life safety guidance in BB 100 is followed. A final draft consultation document for a new version of BB 100 proposed that it will no longer include an expectation that all new schools will have sprinkler systems fitted. We note that the All Party Parliamentary Fire and Rescue Group raised serious concern about both this proposed change and also the inclusion in the current version of BB 100 of alternative approaches that avoid the need for sprinkler systems.)
The RIBA is actively monitoring the issues raised by the tragic fire at Grenfell Tower, and will update members on any important developments.
RIBA members with information or concerns should contact our members’ information line on 020 7307 3600 or their RIBA regional team.