Fire Compartmentation Surveys: Why Small Gaps Become Big Risks

Fire compartmentation rarely fails in dramatic ways. It fails quietly.

A missing fire collar.

A poorly sealed service penetration.

A fire door with excessive gaps.

A wall that stops short of the slab.

Individually, these issues can appear minor. Together, they undermine the fire strategy the building depends on.

In large and complex buildings, especially those that remain occupied during refurbishment or phased works, compartmentation is a primary life safety control. It limits fire spread, protects escape routes, and supports safe evacuation.

Recent surveys continue to highlight recurring issues:

• Service penetrations left unsealed

• Fire doors incorrectly installed or poorly maintained

• Partitions not extended fully to structural soffits

• Intumescent seals damaged, painted over, or missing

• Inconsistent workmanship between trades

These failures are rarely design intent. They are typically the result of delivery and oversight issues. Services are moved during installation, retrofitted into existing structures, or routed without coordinated fire stopping detail. Without inspection and sign off, small gaps are left behind that compromise the compartment line.

Under the Regulatory Reform Fire Safety Order and the Building Safety Act, duty holders must understand how fire risk is controlled in their buildings. That includes knowing the condition of fire compartmentation, not assuming it remains intact.

For higher risk or complex assets, compartmentation surveys should be systematic and recorded. Photographic evidence, marked up plans, and clear remedial schedules demonstrate active management.

There is also a secondary issue that is often overlooked.

Compartmentation defects create air leakage paths. In large buildings, uncontrolled air movement increases energy demand and undermines environmental targets. Addressing fire stopping defects can improve safety and building performance at the same time.

The objective is proportionate correction.

Not every defect requires wholesale replacement. But every defect requires informed technical judgement.

At Soldi CDM and Fire, surveys focus on evidence, buildability, and practical remediation routes. The aim is simple: restore the intended fire strategy and protect the building and its occupants.

Small gaps become big risks when ignored. Identified early, they are manageable.