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Fire Stopping

Fire Stopping — certified installation and remedial works to maintain compartmentation

We install and remediate fire stopping for service penetrations, voids, risers and structural openings using third-party tested systems. Every install is photographed, asset-tagged and recorded in a digital firestopping register so the evidence travels with the building. Our installers work to the manufacturer's tested detail aligned with FIRAS and IFC Certification — the standard insurers, principal contractors and the Building Safety Regulator now expect.

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SSAIB Certified
Fast Response Times
15+ Years Experience
500+ Commercial Clients

Who is this for?

For principal contractors, M&E contractors, fit-out teams, FM teams and accountable persons who need fire stopping installed correctly and evidenced — whether on a new build, a refurbishment, or as remedial works following a compartmentation survey.

  • Principal contractors managing Building Safety Act handover packs
  • M&E and IT contractors closing penetrations after first/second fix
  • Fit-out and CAT-A/CAT-B contractors completing partition works
  • FM teams reinstating compartmentation after maintenance access
  • Managing agents and freeholders closing out compartmentation survey defects
  • Schools and academies with confirmed fire stopping defects to remediate
  • Healthcare estates with progressive horizontal evacuation strategies
  • Higher-risk buildings (HRBs) building out the golden thread

Common fire stopping issues we resolve

  • Service penetrations sealed with expanding foam, generic mastic or mineral wool that has no third-party fire test evidence and will not be accepted by building control or insurers
  • Mixed firestopping systems where products from different manufacturers have been combined, voiding the tested detail and the Regulation 38 information
  • Recent works — IT cabling, M&E upgrades, partition changes — that have created new penetrations without the fire stopping being reinstated
  • No firestopping register, no installer certification and no photographic evidence — leaving the responsible person unable to evidence the golden thread under the Building Safety Act 2022
  • Cavity barriers missing or incorrectly fitted in timber-frame, SIPS and modular buildings, allowing concealed fire spread within the structure
  • Fire-resisting ductwork and dampers installed without verification of fire-rated continuity into the surrounding compartment

What's included in our fire stopping service

Third-Party Tested Systems

Every penetration is sealed using a system that has been tested and certified to BS EN 1366-3 (penetration seals) or BS EN 1366-4 (linear gap seals) for the specific substrate and service involved — no improvisation.

FIRAS / IFC Aligned Installation

Our installers work to the manufacturer's tested detail and follow the principles set out by FIRAS, IFC Certification and the ASFP. We do not mix incompatible systems.

Photographic Register

Every penetration is photographed before, during and after installation, given a unique reference number, and recorded in a digital firestopping register that you keep.

Asset Tagging on Site

We label each remediated penetration on site with a unique tag linked to the register, so future maintenance teams know exactly what is installed and how to reinstate it.

Installer Certification

On completion we issue installer certification listing every penetration treated, the system used, the manufacturer's tested detail referenced, and the operative who installed it.

Reinstatement Service

We can be retained on a call-off basis to attend after maintenance, M&E or fit-out works and reinstate the compartmentation — keeping the firestopping register intact over the building's life.

Scope of works

Our qualified engineers carry out the following as standard:

Cable and cable tray penetrations through fire-rated walls and floors
Pipe penetrations (combustible and non-combustible) with appropriate collars or wraps
Ductwork penetrations including fire damper interfaces
Linear gap seals at head-of-wall, deflection joints and movement joints
Cavity barriers in concealed roof voids, ceiling voids and external cavities
Fire-rated mastic, intumescent sealant, batt, board, pillow and collar systems
Service riser firestopping at floor-by-floor compartment lines
Plant room and switch room penetration sealing
Reinstatement of fire stopping after M&E first/second fix
Photographic recording at every stage with unique IDs
Schedule of installed systems with manufacturer references
Installer certification and digital firestopping register

Need fire stopping installed or reinstated against a tested detail? Book a scoping visit today.

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Optional services

Compartmentation Survey

Before remediating, a Type 2 or Type 4 compartmentation survey identifies every defect, marks them on floor plans and prices the schedule of works — bundled with installation as a single accountable contract.

Pre-Handover Regulation 38 Pack

For new build and major refurbishment, we produce the Regulation 38 fire safety information pack required at completion, including firestopping system details and as-installed photographs.

Toolbox Talks for Site Teams

We deliver short on-site toolbox talks for principal contractors and FM teams so the people drilling holes understand why and how compartmentation must be reinstated.

Fire Door Remedials (BS 8214)

Fire stopping and fire door remedials are commonly bundled — flat entrance and cross-corridor doors form part of the same compartment line as the firestopping.

Cavity Barrier Installation

Concealed-space cavity barriers in timber-frame, SIPS, modular and refurbished buildings — installed using systems tested for the specific construction type.

Annual Re-Inspection

We return on an agreed cycle to re-inspect high-risk areas and update your firestopping register, keeping the golden thread current.

Typical project timeframes

Reactive single-penetration reinstatementSame week, subject to access
Small remedial package (up to 50 penetrations)1–3 days on site
Mid-size remedial package (50–250 penetrations)1–2 weeks on site
Large estate remedial programme (250+)Phased over 4–12 weeks
Installer certification turnaroundWithin 5 working days of completion

Key benefits

Third-party tested and certified systems — no improvisation
Photographic evidence and unique reference IDs for every penetration
Aligned with FIRAS, IFC Certification and ASFP installation principles
Digital firestopping register issued at completion
Installer certification listing every system and detail referenced
Aligned with the Building Safety Act 2022 golden thread requirements
Single provider — survey, remedials and reinstatement in one contract
Reactive call-off service available for live sites

Ongoing support & maintenance

Reactive Reinstatement

When other trades break a compartment line during M&E or fit-out works, we attend, reinstate the firestopping with a tested system and update the register.

Annual Re-Inspection

We re-survey high-risk areas — typically risers, plant rooms and recently-accessed voids — and update your firestopping register on an agreed cycle.

Single Point of Accountability

Survey, installation, certification and re-inspection from one company — so there's no gap between the contractor who identified the breach and the contractor who closed it.

Site Inductions & Toolbox Talks

We can deliver short site inductions for the principal contractor's trades so each operative understands what fire stopping reinstatement is required after their work.

How it works

01

Scoping

We confirm the scope from a compartmentation survey, drawings or a site walk — including substrate, services and the fire-rating required by the strategy.

02

System Selection

We select the third-party tested system that matches each substrate / service / fire-rating combination, referencing the manufacturer's tested detail.

03

Installation

Our installers carry out the works to the tested detail, photographing each penetration before, during and after.

04

Tagging & Register

Each penetration is asset-tagged on site and entered into the digital firestopping register with photographs, location and system details.

05

Certification & Sign-Off

We issue installer certification listing every penetration treated and the system used. The register is handed over for inclusion in the building safety case.

Case study
Case Study

Remedial fire stopping across a 6-storey residential block

Residential block — managing agent, North London

Scale48 flats, 6 storeys
Duration6 weeks on site
Outcome134 penetrations remediated to tested detail
Challenge: Following a Type 4 compartmentation survey, 134 non-compliant service penetrations had been identified across common areas, risers and roof voids. The managing agent needed the remediation completed and evidenced for the building insurer.
Solution: Our installation team mobilised over 6 weeks, treating each penetration with the appropriate third-party tested system — intumescent collars, batt-and-mastic, intumescent sealant or pillows depending on substrate and service. Every penetration was photographed, asset-tagged and entered into a digital firestopping register.
134 penetrations remediated to tested detail
Digital firestopping register issued
Installer certification covering all works
Insurer evidence pack accepted first time

Frequently asked questions

What is fire stopping?
Fire stopping is the sealing of gaps and penetrations through fire-resisting walls and floors — for cables, pipes, ducts, trays and structural openings — using systems that have been tested and certified to maintain the fire and smoke resistance of the original element. It is the practical way the building's compartmentation strategy is held together over its life.
What is the difference between fire stopping and a compartmentation survey?
A compartmentation survey is the inspection that identifies whether each compartment line is intact and which penetrations are non-compliant. Fire stopping is the installation work that seals those penetrations using tested systems. We deliver both, often bundled, but they are separate technical disciplines and most clients want the survey first to scope the works.
What standards does your fire stopping meet?
Our installations follow the manufacturer's third-party tested detail tested to BS EN 1366-3 (penetration seals) or BS EN 1366-4 (linear gap seals), with installation practice aligned to FIRAS (Warringtonfire / UKAS), IFC Certification and ASFP (Association for Specialist Fire Protection) guidance. Every penetration is recorded with the system used and the tested detail referenced.
Why can't builders just use expanding foam or generic mastic?
Expanding foam and generic mastic have no fire test evidence for the substrates and services they are being applied to. Building control, insurers and the Building Safety Regulator require third-party tested systems for fire-rated penetrations. A penetration sealed with foam or untested mastic is treated as non-compliant in any reasonable compartmentation survey.
Do you supply a firestopping register?
Yes. Every project ends with a digital firestopping register listing each penetration with its unique ID, location, photograph, system used, manufacturer's tested detail referenced, and the operative who installed it. Asset tags on site link each penetration back to the register, so future maintenance teams know exactly what is installed and how to reinstate it.
Can you carry out reactive call-out reinstatement?
Yes — many of our clients keep us on a call-off basis. When their trades break a compartment line during M&E or fit-out works, we attend, reinstate using the tested system and update the register so the golden thread of building safety information stays intact.
How is fire stopping priced?
Pricing is by penetration, with rates that depend on size, substrate (block, plasterboard, concrete), service (cable, pipe, duct), required fire-rating (60/120 minutes), and access conditions. We price transparently against the schedule of works in your compartmentation survey report — most penetrations are in the £30–£120 range, with larger penetrations and complex services priced individually.
Will you also do the survey, or only the installation?
Both. Most clients prefer to bundle the survey and the installation in a single accountable contract — the same team that identifies the defects then closes them, with a single digital register at the end. We are also happy to install against a schedule of works produced by another surveyor, providing it follows the FIRAS / IFC / ASFP principles we work to.
No Obligation

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24-hour response
SSAIB certified
500+ commercial clients

What happens after you contact us

1

We review your enquiry

A member of our team reviews your requirements and gets back to you within 24 hours.

2

We arrange a site survey

We schedule a convenient time to visit your site and assess your needs in person.

3

We prepare a quotation

You receive a clear, detailed quote with no hidden costs or obligations.

4

We schedule the work

Once approved, we agree a start date that works around your operations.

5

We provide documentation & support

On completion, you receive all certificates, reports, and ongoing support details.

Commercial Clients

Trusted by schools, care homes, warehouses, and construction sites

We work with commercial and public sector clients across Bedfordshire, Hertfordshire, Buckinghamshire, and London.

Schools & Academies

Primary schools, secondary schools, multi-academy trusts, and nurseries

Construction Sites

Active building sites, developments, and temporary site compounds

Warehouses & Industrial

Warehouses, distribution centres, factories, and industrial units

Care Homes & Healthcare

Care homes, nursing facilities, clinics, and GP surgeries

Car Garages & Workshops

MOT centres, car dealerships, vehicle workshops, and body shops

Commercial Offices

Offices, business parks, co-working spaces, and corporate HQs

Public Sector

Local authority buildings, NHS facilities, and community centres

Retail & Hospitality

Shops, restaurants, pubs, hotels, and leisure venues

Areas we cover

LutonBedfordSt AlbansWatfordStevenageMilton KeynesHemel HempsteadHitchinDunstableBarnetLondon

Related services

Compartmentation Surveys Fire Risk Assessments Fire Door Remedials Fire Door Inspections Fire Door Installation Compliance Packages

Book certified fire stopping works

Reinstate or install fire stopping using third-party tested systems, with a digital register and installer certification at handover. Contact us for a fixed-price proposal against your schedule of works or compartmentation survey.

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24-hour response
SSAIB certified
500+ commercial clients