Data centres are where important digital systems live, from school records to hospital servers. They keep big chunks of daily life running smoothly behind the scenes. But without the right fire protection in place, they can quickly become vulnerable. Many buildings look safe on the outside, yet still leave gaps that allow fire and smoke to spread fast on the inside.
It’s easy to assume that a modern building is fully protected, especially when packed with tech. But small oversights in planning or maintenance can put the whole setup at risk. Fire can move through gaps in walls, floors, or ceilings if not properly sealed. That’s why fire protection for data centres needs close, careful work.
We have spent years helping building managers spot where things fall short. In this post, we are sharing some of the most common fire protection weak spots in data centres we have seen and how proper industrial fireproofing can fill those gaps. These are problems we are seeing more often, especially in busy cities like London, where constant use and updates mean risks build up fast. The same passive fire protection services we provide for hospitals, schools, multi level office blocks, and other busy sites in London now support the way we plan and deliver upgrades for data centres too.
Poor Compartmentation and Unsealed Openings
One of the easiest ways fire spreads through a data centre is through gaps left during installs or upgrades. Every time a new cable is added, or old pipework is changed, space can be exposed if the hole is not sealed up fully. These spots let fire and smoke travel quickly between rooms or floors.
Common issues we come across include:
• Unsealed cable trays or pipe channels that run between areas
• Void spaces behind walls or above ceilings that were not properly blocked off
• Riser cupboards and service shafts that skip proper sealing around edges
Our teams install fire stopping systems around service penetrations and voids in fire compartment walls and floors so that gaps around pipes, cables, and ducts are brought back in line with the fire strategy and Part B of the Building Regulations. If these breaches are left open, fire does not need long to find a way through. Even smoke can cause major harm long before flames do. Keeping these gaps sealed with the right materials is a quiet but key part of keeping the whole building safe.
Overlooked Subfloor and Ceiling Spaces
Raised floors are great for server cooling and cable access, but they can hide dangers too. The void beneath these floors often fills with wires, ducts, and equipment. If a fire starts there, it can run fast before anyone spots it.
Drop ceilings bring similar challenges above. They house lighting, air systems, and other gear. But unless firestops and insulation are installed correctly across that space, fire might leap from one room to another before triggering alarms.
This is where passive fire systems matter most. By treating hidden spaces like any other room, and making sure steel frames, cable trays, and insulation are properly covered, we help slow fire spread and give more time for evacuation or suppression.
Incomplete Protection of Structural Steel
The steel inside a data centre is strong under normal conditions. But under heat, even thick steel loses its strength quickly. If parts of the steel frame are not protected, the structural integrity of the building starts to fail much sooner in a fire.
Because many beams are hidden behind walls or in storage zones, they are sometimes missed during fireproofing work. People assume what is out of sight is fine, when it is exactly those areas that most need proper treatment.
This is where industrial fireproofing comes in. Coating steel with intumescent or cement-based layers delays how fast it heats up. That buys valuable time. We focus not just on visible steelwork, but hidden braces, girders, and columns. Strong finishes work best when nothing is left out.
Lack of Passive Protection in Server Rooms
Server rooms are at the heart of any data centre. They create heat constantly and are packed tightly with electronics. Some buildings do not fully extend their fire strategies into these rooms.
Here is where we often find gaps:
• Fire doors that do not meet resistance ratings or are fitted without full seals
• Partition walls that lack the right wallboards or do not meet fire ratings
• Equipment racks placed too close together, reducing air flow and increasing heat
When these rooms are built without passive fireproofing in mind, recovery after a fire becomes harder. It is not just about saving the gear. It is about keeping the fire from getting out of that room so it does not bring down the rest of the centre.
Missed Maintenance and Compliance Checks
Regular checks are the easiest way to spot where protection might fail, but busy data centres do not always allow for long pauses or inspections. Over time, that becomes a real safety concern.
We often come across issues like:
• Firestopping that was damaged but not noted
• Coatings that have flaked off from wear or age
• Older fire doors fitted before new safety standards came in
To keep performance consistent, we work under recognised third party accreditation and follow guidance from material manufacturers so our installers stay up to date with new regulations and fire stopping methods. Ongoing upkeep matters just as much as the original install. The best designed systems still need checking. Every now and again, access points shift or more cables are added. That is when new gaps appear. By scheduling these checks around lower activity periods, even the busiest centres can keep protection solid without having to shut down operations.
Building Safer Data Centres That Can Handle the Heat
Fixing fire protection is rarely about big fixes. It is often the small, forgotten spots that cause the biggest spread. Gaps behind walls, pockets under floors, and worn-down coatings on steel can all leave a data centre exposed. When we take the time to look in the hidden areas and complete the pieces that are often forgotten, the whole building becomes safer.
To stay ready, it is important to test, check, and maintain every part of the fire protection system. The safety of staff, data, and operations depends on reducing those risks. Passive protection makes the biggest difference when it starts early, includes all surfaces, and is kept up over time. That is how we build data centres that do not just run well, but stand strong in an emergency.
At ATOL Construction, we understand how challenging it can be to keep every corner of a data centre protected from fire hazards, especially in high-demand environments like London. Addressing issues early and choosing the right passive barriers helps reduce long-term risk. We use proven methods to support building safety, including effective coatings and sealing all potential paths for fire. To see how we apply our experience in practical ways, explore our work with industrial fireproofing for structural steel. For support in keeping your building safer, contact us to discuss your project.
