Fire Stopping: A Guide for Building Owners

Fire stopping is the process of sealing openings and joints in fire-rated construction to maintain compartmentation and prevent the spread of fire and smoke through a building. It is one of the most critical — and most commonly deficient — elements of passive fire protection.

What is Fire Stopping?

Every time a cable, pipe, duct, or service passes through a fire-rated wall or floor, it creates an opening that compromises the fire barrier. Fire stopping seals these penetrations to restore the fire resistance of the construction element.

Fire stopping also includes sealing linear gaps (where walls meet floors, or where different construction elements join) and maintaining the integrity of construction joints.

When is Fire Stopping Required?

Fire stopping is required in virtually every commercial and residential building in the UK. Common scenarios include:

• New construction — all service penetrations through fire-rated elements must be fire stopped during construction
• Refurbishment and fit-out — any new services installed through existing fire barriers require fire stopping
• Remediation — building safety surveys frequently identify historic fire stopping failures that must be rectified
• Building Safety Act compliance — responsible persons must ensure fire stopping is adequate and maintained

Why Use a FIRAS-Certified Contractor?

Fire stopping must be installed correctly to the tested specification. Incorrect installation can be worse than no fire stopping at all, as it may give a false sense of security. FIRAS certification provides independent assurance that the contractor is competent to carry out fire stopping work to the required standard.

FIRAS-certified contractors issue a Certificate of Conformity for completed fire stopping work, providing documented evidence for building safety files, insurers, and regulatory compliance.

How to Commission Fire Stopping Work

1. Identify what needs fire stopping — this may come from a building survey, a fire risk assessment, or construction drawings
2. Find a FIRAS-certified contractor — use our fire stopping contractor directory to find certified contractors in your area
3. Get multiple quotes — provide details of the building type, number of penetrations, access constraints, and whether the building is occupied
4. Check certification — verify the contractor's FIRAS certification is active and covers penetration sealing
5. Obtain documentation — ensure you receive a FIRAS Certificate of Conformity on completion