Fire Stopping Contractors & Installation Services
Capital Fire Doors are experienced fire stopping contractors providing compliant fire stopping installation and compartmentation services for commercial, residential, healthcare, and public sector buildings across London and the UK.
Effective fire stopping is one of the most important — and most frequently overlooked — elements of passive fire protection. A single unsealed penetration can allow fire and smoke to bypass compartmentation and spread through a building in minutes, rendering fire doors and other protection measures ineffective.
What Is Fire Stopping?
Fire stopping refers to the sealing of gaps and penetrations in fire-rated walls, floors, and ceilings — particularly around pipes, cables, ducts, and structural joints — using tested, compliant fire-resistant materials.
When services pass through a fire-rated element of a building, they create a potential pathway for fire and smoke. Fire stopping closes these pathways, restoring the compartmentation integrity and ensuring the building performs as designed in a fire emergency.
Fully certified & accredited fire stopping
Safety and compliance are the foundation of our business.
We’re fully certified to carry out fire stopping in line with the latest UK regulations and safety standards.
What Fire Stopping Installation Covers
Our fire stopping installation services include:
Service Penetrations: Sealing around pipes, cables, conduits, and ductwork passing through fire-rated walls and floors.
Structural Joints: Fire stopping of movement joints, construction gaps, and interfaces between building elements.
Riser Shafts: Compartmentation of vertical service risers to prevent fire spread between floors.
Ceiling Voids & Floor Voids: Sealing service routes and penetrations in concealed spaces that carry fire risk.
Wall & Floor Reinstatement: Restoring fire resistance to walls and floors following building works or new service installations.
Compartmentation Surveys: Assessment of existing compartmentation to identify gaps, defects, and compliance failures.
Compliance & Regulations
Fire stopping is a legal requirement in most commercial and multi-occupancy buildings under UK fire safety legislation. Our services are carried out in line with:
- The Regulatory Reform (Fire Safety) Order 2005
- Approved Document B (Fire Safety)
- BS 9999
- BS EN 1366
- BM TRADA Q-Mark standards
- Third-party certified installation systems
Every installation is fully documented with photographic evidence and compliance records, supporting the responsible person's fire safety management obligations.
Royal Horticultural Society
After being approached by the Royal Horticultural Society (RHS), we conducted a comprehensive fire-stopping survey in their London office.
We inspected the building's service penetrations, gaps and junctions, providing the RHS with a clear report covering all hazardous fire stopping. We then remedied any issues that were highlighted in our survey.
After repairing any non-compliant compartmentation, the building had safe, fully functional fire stopping, with zero major non-conformances at handover.
Find out moreSectors We Work In
Residential: Apartment blocks, housing association properties, and social housing — particularly following refurbishment or new service installations.
Healthcare: Hospitals, care homes, and clinical environments where compartmentation is critical to protecting vulnerable occupants.
Education: Schools, colleges, and universities where regular building works and service upgrades create ongoing compartmentation risks.
Commercial: Office buildings, mixed-use developments, and retail premises.
Industrial: Factories, warehouses, and manufacturing facilities with complex service penetration requirements.
Historic & Listed Buildings: Sympathetic fire stopping solutions that meet fire safety requirements without compromising heritage fabric.
Get in touch with our fire protection experts
Get in touch!Prevent downtime through pre-planned maintenance
Our PPM packages give you a better way to manage your fire stopping. With regular servicing, you stay ahead of compliance - while protecting your budget from avoidable surprises.
Materials & Methods
We install fire stopping systems using tested, third-party certified materials appropriate to the type of penetration, the construction of the surrounding structure, and the required fire rating. Common materials include:
• Intumescent collars and wraps for plastic pipes
• Fire-rated sealants and mastics for cable and small service penetrations
• Mineral wool and intumescent pillows for larger openings
• Fire-rated boards and composite systems for wall and floor reinstatement
• Ablative coatings and endothermic materials for structural steel protection
All materials are installed in line with manufacturer specifications and tested system requirements to ensure the installed solution achieves the required fire rating.
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Protect your budget from surprises
Our scheduled approach means fewer emergencies and better forecasting
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Catch issues before they escalate
We resolve minor issues before they cause compliance failure
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Reduce long term repair costs
Regular maintenance reduces the need for major replacements
Interested in Pre-Planned Maintenance?
Find out moreFire stopping contractors install and maintain passive fire protection systems designed to prevent the spread of fire and smoke through walls, floors, ceilings, and service penetrations within a building.
Sealing gaps around pipes, cables, ducts, and structural joints using tested, compliant fire-resistant materials to restore and maintain compartmentation.
Yes. Under UK fire safety regulations, responsible persons must ensure suitable fire compartmentation and passive fire protection measures are maintained throughout the building.
Fire stopping should be assessed regularly and particularly following any refurbishment works, new service installations, or building modifications that may compromise compartmentation integrity.
Without effective fire stopping, fire and smoke can bypass compartmentation and spread rapidly through a building — rendering fire doors and other protection measures ineffective.
Yes. We carry out compartmentation surveys to assess the condition and completeness of existing fire stopping, identify defects, and provide a prioritised remediation plan.
Most commercial and multi-occupancy buildings, including offices, apartment blocks, schools, hospitals, hotels, care homes, and industrial facilities.
