// FIRE SAFETY


A renewed focus on fire performance


Fire safety has become one of the most critical considerations in the UK construction sector, reshaping design priorities, regulatory frameworks, and client expectations. In the wake of heightened scrutiny and evolving legislation, the industry is under increasing pressure to demonstrate not only compliance, but genuine performance in real-world conditions.


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or those operating within the modern methods of construction (MMC) space, this shiſt presents both a challenge and an opportunity. Offsite and modular construction, with their emphasis on precision and repeatability, are uniquely positioned to respond. However, they must also overcome persistent misconceptions—particularly around materials and system integrity—to fully establish themselves as part of the solution.


Understanding fire safety in an MMC context


Fire safety in offsite construction is not fundamentally different from traditional building— it is governed by the same regulations and performance requirements. What differs is how those requirements are achieved.


In modular and panelised systems, fire performance must be designed into the building at a system level, rather than considered as a series of individual components. Walls, floors, and junctions are manufactured as integrated assemblies, meaning their fire resistance is tested and validated as a whole.


This holistic approach can be advantageous. Factory production allows for consistent installation of fire-stopping measures, accurate placement of cavity barriers, and rigorous quality checks—areas where traditional construction can sometimes fall short due to site variability.


The role of materials


Material selection remains central to fire safety, and it is here that MMC has faced some of its greatest scrutiny. Timber-based systems, in


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particular, have been subject to intense debate, especially in relation to high-rise residential buildings. Yet it is important to distinguish between material behaviour and system performance. Engineered timber products, such as cross-laminated timber (CLT), can offer predictable fire performance when properly designed. Charring rates, for example, can be calculated and incorporated into structural design to ensure stability during a fire.


That said, regulatory changes have placed restrictions on the use of combustible materials in certain building types, particularly those over 18 metres in height. As a result, many offsite providers are adopting hybrid approaches— combining timber with non-combustible materials such as light gauge steel—to meet compliance requirements while retaining the benefits of prefabrication.


Precision as a safety advantage


One of the defining characteristics of offsite construction is precision, and this has direct implications for fire safety. In a factory environment, components are produced under controlled conditions using standardised processes. This reduces the likelihood of errors that could compromise fire performance.


For example, the correct installation of cavity barriers is critical in preventing the spread of fire and smoke within concealed spaces. On a traditional site, this can be challenging due to access constraints and varying levels of workmanship. In contrast, factory assembly allows these elements to be installed accurately


and inspected thoroughly before leaving the production line.


This consistency is one of the key arguments in favour of MMC from a fire safety perspective—it reduces reliance on variable site conditions and introduces a higher degree of assurance.


Managing interfaces and connections


While factory production offers many advantages, it also introduces new challenges—particularly at the interfaces between modules or panels. These junctions must be carefully designed and executed to maintain fire integrity across the building.


Poorly detailed or incorrectly installed connections can create pathways for fire and smoke to spread, undermining the performance of otherwise robust systems. As such, interface design is a critical area of focus in modular construction.


To address this, manufacturers are investing in extensive testing and certification, ensuring that their systems perform as intended not only in isolation but as part of a complete building. Installation processes are also becoming more standardised, with clear guidance provided to site teams to ensure consistency during assembly.


The importance of testing and certification


Fire testing plays a central role in validating the performance of MMC systems. Full-scale fire tests, carried out in accordance with recognised standards, provide evidence that assemblies can achieve the required levels of fire resistance. For offsite manufacturers, this oſten involves testing


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