Rethinking passive fire protection in design
In today's regulatory and professional environment, passive fire protection (PFP) demands the same level of design rigour as structure or MEP services. More importantly, it demands ownership. For architectural designers, this means making fire performance a design driver: not something checked at the end, but something that shapes layouts, risers, and interfaces from the outset.
Historically, fire stopping and compartmentation requirements were often approached with a degree of complacency. Decisions were deferred, details were assumed (or at best, genericised), and a culture of “we’ve always done it like this” prevailed.
The reality is that fire performance is unforgiving of assumption. Buildings rarely fail in isolation; they fail at interfaces, at junctions, and at the boundaries between systems.
One of the most critical challenges lies in the treatment of MEP service penetrations. From an architectural perspective, a penetration may appear to be a simple opening in a wall or floor. In fire resistance terms, however, it is one of the most vulnerable points in a building.
Tested and certified fire-stopping systems are highly specific. They rely on exact configurations: the type of service, the construction it passes through, and the spacing between adjacent services and edges. Deviate from these parameters, and the performance is no longer proven.
It is not uncommon to encounter service penetrations on site that simply cannot be fire-stopped compliantly due to congestion or inadequate spacing. At that point, redesign becomes unavoidable—often introducing delay, cost, and compromise.
This is where design intent and construction reality collide. If sufficient space has not been allowed from the outset, compliant solutions may simply not be possible.
At concept and Stage 3, this means making space for fire safety — literally. Service risers, ceiling voids, and wall zones must accommodate not only the services themselves, but also the tested and evidenced solutions required to maintain compartmentation.
At Stage 4, that intent must be translated into coordinated, buildable information. All penetrations should be defined, coordinated, and tied to tested systems through clear drawings and schedules. This is not detailing as an afterthought; it is an essential part of design resolution.
When passive fire protection is left too late, the consequences are predictable: delays, cost increases, and erosion of design intent. More critically, it introduces uncertainty into how a building will perform in fire conditions.
A key part of this shift is understanding passive fire protection as a system, rather than a collection of products. Wall constructions, fire doors, cavity barriers, linear joints, fire-resisting ductwork, dampers, and penetration seals must be designed and coordinated as parts of a coherent whole.
The Passive Fire Knowledge Group (PFKG) has been a strong advocate for this cultural and disciplinary shift, promoting early integration, evidence-led design, and clearer ownership of PFP across the project team.
For architectural designers, this presents both a challenge and an opportunity. The challenge lies in engaging with a level of technical complexity that may sit outside traditional practice boundaries. The opportunity is for architectural technologists to take a leading role in delivering safer, more resilient buildings.
Ultimately, passive fire protection is not about products or documentation. It is about how buildings, as systems, perform under stress, when lives depend on decisions made long before construction begins.
Those decisions start on the drawing board, and they determine whether a building performs when it matters most.
This article first appeared in ATJ issue 158
