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Putting fire safety first

Lessons for modular constructions and prefabricated buildings

If News spoke with Andreas Kräling, Head of Risk Management Services and Sören Isaksson, Risk Engineer at If insurance.   The two experts have more than 50 years of work experience in risk engineering and in their daily work, they instruct If customers in the use of combustible materials.

Benefits of modular construction

Lower labour costs, less materials, shorter construction time and higher quality. These are just some of the benefits of modular and prefabricated construction.

Rather than laying brick by brick and pouring concrete on-site, several components are built in a factory and transported on-site. With a cost focused housing market, there is a need for exactly these kinds of solutions to meet the demand.

What to be aware of?  

The likelihood of fire hazards in modular constructions has received new attention after the Moorfield Hotel fire in the summer of 2020. In this article, we will take a deep dive into the risk of fire hazards in especially modular and prefabricated buildings.

Lastly, we will outline what precautions there should be considered in order to minimise the risk of fire hazards.

Fire hazards in modular constructions: An example from summer 2020

The Moorfield Hotel in the Shetland Islands burned to the ground after a devastating fire (source: BBC). The 106-bed hotel was fabricated offsite using insulated panels and modules utilising sandwich-construction.

The construction consisted of a wooden board (OSB), using a polyurethane foam insulation, and close to the void or gap between the modules, there was another OSB board (source: FPA). This void in the construction was about 12 millimetres wide, which meant that there was wooden material on both sides of this void.

Both the wooden board (OSB) and the Polyurethane foam are highly combustible materials, which may have been contributing factors to the severity of the fire.

Insights for your next construction project

According to Andreas Kräling and Sören Isaksson, this type of construction is unfortunately common in modern construction, and several large losses have occurred as a result of combining modular constructions with combustible building materials.

We see that the regulations of the past, which enforced stricter authority control on construction, e.g. with inspections and regulatory standards, has decreased significantly.

There are precautions that builders and developers should take into consideration to minimise the risk of fire hazards and still benefit from cost-effective construction methods. Andreas Kräling and Sören Isaksson provided insights into some key considerations for your next construction project.

Engage If’s risk engineers as early as possible in the planning stage

Engaging If’s risk engineers in the early planning stages of e.g. the construction of a large industrial building, will result in a thorough understanding of the existing as well as potential risks.

In the early planning stage, If’s risk engineers can provide advice, based on lessons from losses, e.g. the use of non-combustible building materials to ensure that adequate fire protection is installed.

It’s important for me to emphasize that voids inside a construction made from combustible materials is a huge potential risk. If a fire finds its way to this void, it is extremely difficult to access by the fire brigade or a sprinkler system installed in the rooms. An uncontrolled fire spreading in the voids can as in the Moorfield fire lead to a complete loss of the entire building.

Install a reliable fire safety system

A well-designed and properly installed sprinkler system will prevent the fire spreading, control and extinguish it. However, despite the importance of a well-functioning sprinkler system, it should never be at the expense of additional fire safety systems.

The sprinkler system should be connected to the fire alarm system that can detect the generation of combustion gases at a very early stage. The fire safety system should be commissioned and approved by a third party.

To ensure effectiveness of the protection systems, assembly and quality of works are essential, as unintentional voids and gaps risks compromising the protection system.

Go beyond the legislative demands

The legislative demands for fire safety tend to go merely to the minimum requirement when it comes to protecting lives.  However, it does not cover protection of property to the same extent.

Here we should instead use common sense, look at the risks and apply a risk management approach to ensure the right level of safety and risk mitigation. This emphasize that even though person safety is of course important, property losses may end up being a huge loss if clients only go with the minimum requirements.

For example, regulations differ immensely from country to country. In the US, each state has its own legislation, and even on county level, there will be differences.

Do you have a site in the U.S? What are the local requirements there? Should we consider the risk of natural catastrophes, such as earthquakes and floods? Ask the right questions and accept that a one-size-fits all model isn’t good enough when it comes to minimising the risk of fire hazards and other risks.

Don’t limit the safety and protection level to only the minimum requirements in legislation and codes. Apply Risk Management and evaluate what is needed based on the risk and exposure.

If you are interested in seeing the combustibles hazard info sheet, contact your Account Executive in If.