Tag Archive for: Fire Protection

Passive Fire Protection in Residential Buildings

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Passive fire protection has been implemented since the 17th century. During the Great Fire of London, in 1666, it was proved that the wooden construction of the surrounding buildings had exacerbated the blaze contributing to the destruction of 13,200 houses, 87 churches, 52 livery company halls and obliterating the city’s infrastructure.

In response to this, King Charles II instructed for all buildings to be made of stone and for the roads to be widened. In addition to this, the government introduced the 1667 London Building Act, which, among its laws, stipulated that buildings be constructed with masonry to resist the break out of fire and prevent the spread of it. It was thought that passive fire protection was created at this time.

Whilst building regulations have improved significantly since the 17th century, there is still more work to be done to ensure that correct modern standards are correctly implemented. According to Home Office statistics, the number of fires that the Fire Services have to attend and the number of deaths that are caused by fire related incidents are increasing.

The Importance of Passive Fire Protection

Passive fire protection is built into the walls and floors of buildings to separate them into areas of manageable risk. Each area is able to prevent the spread of the fire to other areas. The idea is that the fire is contained long enough in one of these areas for occupants to evacuate from the building and for the fire brigade to fight the fire.

Most products of passive fire protection resist the fire instead of fight it. Fire resistance is achieved through constructions such as columns, walls, floors and doors. Each of these constructions will be able to resist fires in one of three ways:

  • resist structural collapse
  • resist heat conduction
  • resist the passage of smoke and noxious gases

All floors in a building must have components that resist fires in all three ways.

Passive Fire Protection in High Rise Residential Buildings

In the event of a fire, high rise buildings are designed to provide fire resistance that ensures the prevention of the fire spreading from where it originated. This can only be relied upon if the fire resistant materials were compliant with building regulations at the time of construction and they have been properly maintained and managed throughout their lifetime.

Due to the reliance of a high-rise building’s passive fire protection, residents are asked to stay put in the event of a fire breaking out. This is thought to be the safest option for them as the alternative may see residents leave their place of safety. Unfortunately, as we know in the recent events of Grenfell, the stay put method can only be relied upon if the appropriate passive fire protection is installed. If it isn’t, it can prove fatal as it did that day when 71 people tragically lost their lives.

Passive Fire Protection and the Law

Building owners who own property that do not pass regulations are now able to be prosecuted under the Regulatory Reform (Fire Safety) Order 2005 with some sentences going as far as being custodial. Since this came to pass, more emphasis has been placed on buildings being compliant.

Under the Buildings Regulations of England and Wales, contractors have the responsibility of handing over appropriate fire safety information to a ‘responsible person’ on completion of the building or extension of the building and it first being occupied.

Furthermore, the fire safety information given should include all design measures in appropriate detail and accurate enough so the ‘responsible person’ understands what they need to do to maintain the building safely. Building work should have been completed with adequate and proper materials sufficient for their intended use.

Despite the specific detail that these regulations go into, it is very common for built in passive fire materials, to not be compliant.

Overcoming Non-Compliance

Currently, the construction of a residential building requires the input and expertise of many fields – from architects to fire engineers to contractors. Throughout the process, the building undergoes many inspections to ensure compliance. In her interim report into the Grenfell fire, Dame Judith Hackitt acknowledged that it is therefore difficult to focus the blame for non compliance on one specific area.

She recommended in her report that there is a process change and that duty holders be tasked with ensuring compliance to a new body made up of the Health and Safety Executive, Local Authority and Fire and Rescue Professionals. This new body would be called the Joint Competent Body.

If this were adopted and implemented, it would ensure not only that more residential buildings were constructed compliantly but be able to sanction duty holders if they weren’t.

Further Incentive for Getting Things Right

Passive fire protection items that are condemned at handover or any time after fall on the responsibility of the construction company to correct. Items that are enclosed within the building can be extremely costly to repair possibly resulting in the loss of millions of pounds. This would undoubtedly bring its own financial implications.

Improvements

Small changes to attitudes and processes could reap significant improvements in passive fire protection compliance.

It is important for the sake of a building’s fire compartmentalisation that drawings are understood accurately and that architects are encouraged to be more specific of what design and materials are used.

Principal contractors should be discouraged from splitting passive fire protection into different sub-contracted packages. This method could lead to a lack of focus and could result in non-compliance.

fire

How does Passive Fire Protection work?

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Passive fire protection (PFP) is an essential component of structural fire protection and fire safety in a building. PFP attempts to contain a fire or prevent the fire from spreading to other parts of the building by the use of fire-resistant walls, floors and doors. A fire protection system for any building will have the following:

  • Active Fire Protection – Manual or automatic fire detection or suppression
  • Passive Fire Protection – Compartmentalising the building with fire resistance walls and floors. Organising the building into smaller fire compartments prevents or slows the spread of fire from its origin to other spaces in the building. This will limit the potential damage to the building and it gives the building occupants time to initiate their emergency evacuation drill and for them to get to safety.
  • Fire Prevention – Minimising potential situations that a fire could break out and educating the occupants of the building on fire safety systems and how they should be maintained and emergency procedures including how to notify fire service response and emergency evacuation.

Any surface that is used for fire resistance is required to have a fire rating. Surfaces are rated by being fire tested where surfaces are exposed to temperatures upwards of 1100°C. Many of these tests are undertaken to test the survivability of the surfaces under realistic conditions.

A lot of Passive Fire Protection systems use many different materials in the design and construction of their systems. Most common endothermic building materials include calcium silicate board, concrete and gypsum wallboard. During fire testing, concrete slabs have been known to emit water as they boil and gypsum commonly loses all its strength when exposed to fire. The use of endothermic materials is established and proven to be sound engineering practice. The chemically bound water inside these materials sublimes. During this process, the unexposed side cannot exceed the boiling point of water. Once the hydrates are spent, the temperature on the unexposed side of an endothermic fire barrier tends to rise rapidly. Too much water can be a problem, however. Concrete slabs that are too wet, will literally explode in a fire, which is why test laboratories insist on measuring water content of concrete and mortar in fire test specimens, before running any fire tests.

PFP measures also include the use of intumescent (a substance that swells under heat exposure) or ablative materials. Any of these surfaces on their own would not be effective against exposure to fire and so need to be organised into a highly effective system that is subject to rigorous testing at multiple times.

Passive Fire Protection is designed to contain the fire in its place of origin, preventing the spread of fire and smoke for a limited amount of time. Firestops, fire walls and fire doors undergo the above-mentioned fire testing and fire resistance is usually determined in how many hours these particularly materials can contain the fire for. Their certification will provide the limitations that are present with these materials.

Unlike Active Fire Protection, Passive Fire Protection does not usually involve any form of activation or degree of motion with the exception of fire dampers and fire door closers which must move, open and shut in order to function as well as all intumescent products which rely on swelling to operate effectively.

There are mainly two types of Passive Fire Protection; intumescent and vermiculite. With vermiculite protection, the structural steel members are covered in a thick layer of hydrous phyllosilicate mineral that undergoes significant expansion when heated. This is a cheaper option to the intumescent materials but is not aesthetically pleasing. Furthermore, if the environment is corrosive, then the vermiculite is not advisable as there is a possibility of water seeping into it and will make it difficult to monitor corrosion. Intumescent fire protection is a layer of paint with a coating system along the structural steel members. The thickness of this coating depends on the steel section used. Intumescent coating is relatively low in thickness which makes it more pleasing to the eye and produces a nice finish with an anti-corrosive nature.

In the event of a fire in a building, the steel structure will eventually collapse once the steel hits its critical core temperature of around 550°C. Passive fire protection will delay this by creating a layer between the steel and the fire. This can potentially add another 2 hours to the integrity of the structure saving lives and damage to property inside the building.

If you require a competent fully accredited fire protection company, you have just found it! Broadsword Fire Protection LTD welcomes your enquiries.

 

 

FIRAS

Broadsword launch Fire Protection Arm

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We are proud to announce that we have launched a new Fire Protection Arm of the Company.

Broadsword are experts in fire protection and are FIRAS accredited.

Most companies do not realise that they need fire protection and if they do, they don’t know where they can get it.  

Broadsword Fire Protection LTD can make sure that your building is protected from fire, we can also retrospectively assist with existing buildings.

Building regulations outline the need for large buildings to be divided into compartments and specifies the level of fire performance the compartment walls and floors need to achieve in order to preserve both building structure and life through fire and smoke containment.

In most buildings, mechanical and electrical services by necessity breach compartment walls and floors allowing failure of integrity and insulation to occur where gaps around services have not been adequately fire stopped. The use of correctly installed certified fire stopping systems will contain a fire at its source and limit the risk of the destruction caused by the spread of fire and the release of toxic gasses.

If you require a competent fully accredited fire protection company, you have just found it!

Broadsword Fire Protection LTD welcomes your enquiries.