Lawrence Webster Forrest (LWF), Fire Engineering and Fire Risk Management Consultants
Lawrence Webster Forrest (LWF), Fire Engineering and Fire Risk Management Consultants



Navigation

Client login
Forgotten password
Follow us on Twitter Follow us on Facebook Subscribe to our blog

Lawrence Webster Forrest
Legion House
Lower Road
Kenley
Surrey
CR8 5NH

Tel: +44 (0)20 8668 8663 Fax: +44 (0)20 8668 8583
E-mail: fire@lwf.co.uk

Fire Safety for Healthcare Premises - Cavity Barriers - Part 42

Posted by LWF: 04/10/2018 13:17

In LWF’s blog series for healthcare professionals, the aim is to give information on best practice of fire safety in hospitals and other healthcare premises. In part 41 of this series, we looked at the use of ventilation systems in healthcare venues and how this differs in a fire situation to most other types of building. In part 42, we will discuss cavity barriers and fire safety.

Fire and smoke can spread without interruption through concealed spaces or cavities in the construction of a building. Fire can travel to areas far remote from the seat of fire origin through concealed spaces, with the potential to cause a site-wide fire incident and so it is essential that fire-resistant barriers are put in place to restrict the size of any concealed spaces and a fire’s ability to spread through the space.

In healthcare venues, the requirements for subdivision due to hazard protection, sub-compartmentation and compartmentation are such that often additional subdivision of ceiling voids for cavity barriers is not necessary. There are exceptions, however, and one is where sub-compartment walls and walls to fire hazard rooms are constructed with 30-minute fire-resisting ceilings.

Regardless of the requirements for subdivision, it is a necessary requirement to prevent the interconnection of horizontal and vertical cavities. 

HTM 05-02: Firecode – Appendix E: Construction and fixing of cavity barriers (PDF) provides guidance on the construction and fixing of cavity barriers in healthcare venues and should be referred to at the building design stage.

30-minute fire-resisting barriers should be installed to provide a subdivision of concealed roof or ceiling voids. The result should be that an uninterrupted roof or ceiling void should not exceed 20 m. Where it is possible to do so, cavity barriers should be positioned to coincide with fire-resisting walls, in order to reinforce compartment boundaries. One exception to this is the ceiling void above operating departments.

30-minute fire-resisting cavity barriers should also be provided to prevent the interconnection of vertical and horizontal cavities, at each intersection of fire-resisting construction and elements containing a concealed space and within the void behind the external face of rain-screen cladding, at every floor level and on the line of compartment walls which abut the external wall.

In part 43 of this series, LWF will continue to discuss the use of cavity barriers in healthcare venues, before beginning to look at the use of sprinkler systems. In the meantime, if you have any questions about this blog, or wish to discuss your own project with one of our fire engineers, please contact us.

Lawrence Webster Forrest has been working with their clients for over 25 years to produce innovative and exciting building projects. If you would like further information on how LWF and fire strategies could assist you, please contact Peter Gyere on 020 8668 8663.

While care has been taken to ensure that information contained in LWF's publications is true and correct at the time of publication, changes in circumstances after the time of publication may impact on the accuracy of this information.

Leave a reply

  *

  *

 


CAPTCHA Image

[ Change the image ]


*Required

Subscribe to our fire safety blogs

Bulletins
Email Format
* indicates required

FIRE SAFETY BLOGS

  • Fire Engineering Design and Risk Assessment - Firefighting & External Water Supplies - Part 27

    In LWF’s Fire Engineering blog series for Architects and others in the building design business, we have been looking at fire safety engineering. In part 26, we looked at how the choice of fire hydrant can affect the efficiency of delivery and by working out the additional time required to prime an underground hydrant when compared to a pillar hydrant with instantaneous couplings, it was established there could be as much as 2 minutes delay...

    Read more...

  • Fire Safety for Healthcare Premises - Venting of Basements - Part 61

    In LWFs blog series for healthcare professionals, the aim is to give information on best practice of fire safety in hospitals and other healthcare premises. In part 60 of this series, the placement of fire hydrants in relation to hospital buildings was discussed. In part 61, we will look at the effects of smoke on basement levels and the use of venting.A fire which starts in a basement or involves a basement level causes...

    Read more...

  • Facilities Management & Fire Safety - Insurers & Property Protection - Part 8

    In LWF’s blog series for those who work in Facilities Management or who have an interest in or responsibility for fire safety, we have been looking at the part Insurers have played in property protection over the years. In part 7, we discussed the role the FOC played in producing rules and regulations not only for building standards but also for fire protection products. In part 8, we will continue looking at the impact of...

    Read more...

  • Fire Engineering Design and Risk Assessment - Firefighting & External Water Supplies - Part 26

    In LWF’s fire engineering blog series for Architects and other interested parties in the building design business, we have been looking at firefighting. In part 25, we looked at how hydrants should be located in relation to the building perimeter and the likely position of a Fire Service pump upon attending a fire at the premises. In part 26, we continue looking at location and also the type of hydrant provided in relation to the...

    Read more...

  • Fire Safety for Healthcare Premises - Fire Mains - Part 60

    In LWFs blog series for healthcare professionals, the aim is to give information on best practice of fire safety in hospitals and other healthcare premises. In part 59 of this series, LWF discussed the requirements for healthcare buildings with a hospital street and which do not require a fire-fighting shaft. In part 60, we will look at the provision of fire mains.Fire mains must be provided in every firefighting shaft, or in some instances,...

    Read more...

Case Studies

The Wohl Neuroscience Institute - Fire Safety, Strategy & Engineering
Key Facts: Client: King’s Clinical Neuroscience Institute Project Manager: MACE Ltd Designers: Devereux Architects/Allies and Morrison Approximate Size: 7,400m2 Description of the Project:...

Read more..

General Bulletins

Fire - The External Risk
When we consider fire safety, our focus is normally from within, what can we do to prevent the occurrence of fire and how we can limit its damage.  Whilst this is the correct stance to take, we m...

Read more..

Technical Bulletins

Evacuation Modelling - Factor in Human Behaviour
Evacuation of buildings can be analyzed in different ways. Approved Document B (ADB) which provides guidance on meeting the requirements of the England and Wales Building Regulations with regard to fi...

Read more..

Site map | Web development London