What is compartmentation?
Compartmentation divides a building into fire-resisting compartments using walls and floors designed to hold back fire and smoke for a set period. It is what makes 'stay put' and phased evacuation strategies safe.
Why does fire stopping fail?
Compartmentation is most often breached by later works — new cables, pipes or maintenance that pass through a fire barrier without being properly sealed. These breaches usually hide above ceilings and inside risers, invisible during a routine walk-round.
What should landlords do?
Commission a compartmentation survey to locate breaches, then reinstate fire stopping using third-party tested systems, documented photographically. Under the Building Safety Act 2022, maintaining this 'golden thread' of information is increasingly a legal expectation.
Frequently asked questions
Is compartmentation a landlord's responsibility?
Yes — as part of the Responsible Person's duties to maintain fire-safety provisions under the Fire Safety Order.
How do I find hidden breaches?
A compartmentation survey inspects concealed areas such as voids, risers and above ceilings.
What systems should be used to reinstate fire stopping?
Only third-party tested and certified systems, installed to the manufacturer's specification.