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Compartmentation

Compartmentation that actually works.

Service penetrations are the single most common point of compartmentation failure. We seal cables, pipes, ductwork, and structural openings to maintain the fire integrity of every wall, floor, and ceiling.

Certified Products Only Photo-Logged Per Penetration BS 476 / EN 1366 Tested
CMH Fire & Compliance specialist sealing service penetrations
What we seal

Every breach in the fire-resisting fabric.

If something passes through a fire-rated wall or floor, it has to be sealed with a tested system — and the evidence has to be on file.

Cable & conduit penetrations

Single cables, bundled trays, and containment routes sealed with certified intumescent compound or batt & coat systems.

Pipework

Plastic, copper, and steel pipework sealed with intumescent collars, wraps, or compound — system selected to match pipe material and fire rating.

Ductwork & ventilation

Fire dampers fitted and tested, and surrounding ductwork sealed back to the host wall with the correct fire-rated system.

Structural openings & voids

Larger openings around beams, rebates, and wall-to-floor junctions filled with rock-wool batt and intumescent sealant to BS 476 / EN 1366.

Why it matters

A single unsealed cable tray can void an entire wall's fire rating.

Fire spreads through the path of least resistance — and that's almost always an unsealed penetration in an otherwise correct compartment wall. Insurance assessors and fire officers know this; they look in the ceiling void, behind risers, above suspended ceilings.

Every penetration we seal is photographed and logged with the product used and the system it conforms to. You get a register that proves the work was done correctly — not just that something was applied.

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Compartmentation work in a UK plant room
Questions

Compartmentation, answered.

What is compartmentation?

Dividing a building into fire-resisting compartments so that fire and smoke are held in the area where they start long enough for people to escape and firefighters to act. Fire stopping is the work of sealing the gaps and penetrations in those walls and floors with tested systems so the compartment keeps its rating.

Which penetrations need sealing?

Anything that passes through a fire-rated wall or floor: cables and cable trays, pipework, ductwork and dampers, and structural openings and voids. Each is sealed with a system tested to BS 476-20 and 22 or BS EN 1366-3 and matched to the material passing through.

How is the work evidenced?

Every penetration is photographed before and after and logged with the product used and the tested system it conforms to. You receive a register that proves the work was done correctly, which is what fire risk assessors and insurers ask for.

Who is responsible for compartmentation?

The Responsible Person under the Regulatory Reform (Fire Safety) Order 2005. Fire risk assessments frequently identify breached compartmentation in ceiling voids and risers, and remediation is a common action point.

Get a compartmentation survey of your building.

We identify every penetration that's at risk — and quote a fix on a per-penetration basis. Quotes within 7 days from our Wolverhampton and Nottingham offices.