Fire-stopping plays an important part in how a building performs during a fire. When gaps, penetrations and voids open up around services, a fire can travel through a building much faster than people expect. A fire-stopping survey is the way to check those weaknesses, record them and give clear direction on how to fix them. In this article we will cover everything you need to know about fire stopping surveys:
What Is a Fire-Stopping Survey?
Why Is a Fire-Stopping Survey Important for Building Safety?
When Should a Fire-Stopping Survey Be Conducted?
How Do Surveyors Carry Out a Fire-Stopping Survey?
What Are the Most Common Fire-Stopping Defects That Surveys Find?
What Happens After a Fire-Stopping Survey?
Who Is Qualified to Perform a Fire-Stopping Survey?
What Are the Regulatory and Legal Requirements for Fire-Stopping Surveys?
What Is a Fire-Stopping Survey?
A fire-stopping survey is a detailed inspection that checks how well a building holds its compartments together. Every building is built as a series of boxes inside a bigger box. Your flat is a box. The corridor is another. Each one has walls, floors and ceilings designed to hold fire and smoke inside that single space for a set amount of time. This gives people time to escape and protects escape routes.
A fire-stopping survey checks if anything has broken that box. Service penetrations, cables, pipework, poorly built walls, old openings, missing seals, damaged plasterboard, unsupported services and changes made by trades over time all impact the fire rating. A survey records these issues and compares them to tested fire-stopping systems. It brings the building back into alignment with product evidence and current regulations.
For a foundational explanation of what fire stopping is and why it matters in passive fire protection, see our detailed guide on What Is Fire Stopping?
Why Is a Fire-Stopping Survey Important for Building Safety?
A fire-stopping survey is vital because a building loses its fire resistance as soon as one penetration loses integrity. Most incidents start in a small area but spread through voids, risers and unprotected openings. Once fire or smoke breaks into the structure or reaches escape routes, the danger to lives increases sharply.
Carrying out a fire-stopping survey protects the building by restoring compartment lines. It also prevents issues during Gateway 2 checks under the Building Safety Act. If a design team cannot prove competency or correct fire-stopping design, work can stop on site. There have been real cases where this caused thousands per week in delays.
A fire-stopping survey also supports the Golden Thread. Every modern building needs a living record that tracks fire systems, tested products, installation evidence, design changes and maintenance updates. Fire-stopping sits inside that record because it directly affects structural fire behaviour.
When Should a Fire-Stopping Survey Be Conducted?
A fire-stopping survey is needed at key stages of a building’s life.
During planning and design
Gateway 1 introduces fire design requirements at the planning stage. Early surveys and design checks give the team the right wall types, tested systems and spacing requirements before construction starts.
Before construction starts on site
Gateway 2 requires the design team to submit accurate information to the Building Safety Regulator. This includes penetration details, wall types, service layouts and product evidence. A survey at this stage checks that designs match what manufacturers have tested.
During construction
Services get moved, added or re-routed constantly. Surveys during construction catch issues early and stop trades covering mistakes behind ceilings, floors and partitions.
During occupation and maintenance
Any time services get upgraded or new penetrations get cut, the compartment lines need to be checked again. Regular fire-stopping surveys help landlords, hospitals, care homes and owners stay compliant and avoid expensive remedial programmes later.
How Do Surveyors Carry Out a Fire-Stopping Survey?
To carry out a fire-stopping survey properly, surveyors walk the building and look at every point where a fire could travel. They check inside risers, above ceilings, service cupboards, plant rooms, lofts, corridors, stairwells and structural junctions. They look at the substrates in place and compare them to tested systems.
Surveyors check wall types such as plasterboard, shaft walls and blockwork. They check what services pass through the compartment lines such as:
PVC pipes
HDPE
Lagged copper
Steel pipework
Cable baskets
Trunking
Ductwork
Surveyors check spacing around penetrations too. Tested systems normally require around 100mm between services and between a service and the wall edge unless the manufacturer has evidence for a smaller tolerance.
Surveyors also check the things people normally overlook such as:
Deflection heads
Oversized openings
Unsupported services
Builder’s work openings
Duct runs
Dampers that sit in their own dedicated openings
A fire-stopping survey captures clear photos and locations so nothing is missed. The method is intrusive or non-intrusive depending on access but the aim is always the same. Identify every breach. Compare the opening to tested evidence. Advise on the correct system to reinstate fire resistance.
What Are the Most Common Fire-Stopping Defects That Surveys Find?
Most buildings show patterns in the defects found during surveys. These are the most fire-stopping defects found during a survey.
Unsealed penetrations
Services get added long after a building is finished. New pipes and cables often go through walls with no reinstatement at all.
Incorrect materials
Expanding foam, generic mastic or leftover filler often gets used because someone needed a quick fix. These materials do not carry fire resistance ratings.
Incorrect opening sizes
Large openings in plasterboard can create weak-points in the wall because board fixings cannot reach them.
Dampers and ductwork
Dampers need their own opening. When a damper shares a penetration with another service the fire rating collapses.
Unprotected voids
Above ceilings and behind risers often hide the worst defects. These voids allow smoke and heat to bypass compartments early in an incident.
What Happens After a Fire-Stopping Survey?
After a fire-stopping survey, you will get a detailed report. This report explains the location of each defect, the type of wall or floor it sits in, the service type, the size of the opening and the correct product system needed to reinstate the fire rating.
The report uses photographs, drawings and descriptions so contractors know exactly what needs doing. It also aligns the recommended systems with EN test standards.
If requested, the surveyor can support the fire-stopping design during the remedial stages so the correct products and technical evaluations are used. Once remedial works are completed, a certificate of conformity or completion record is added to the building’s documentation.
Who Is Qualified to Perform a Fire-Stopping Survey?
A competent fire-stopping surveyor must understand tested systems, product behaviour, service types, substrate performance and fire safety regulations. Fire-stopping is not something a general tradesperson can assess because they cannot compare openings to laboratory testing.
A qualified surveyor normally has specific fire compartmentation training, inspection accreditation and experience across multiple building types. Professional surveyors also follow the Building Safety Act duties and understand Gateway requirements.
Third-party accreditation gives you confidence that a surveyor works to recognised standards.
What Are the Regulatory and Legal Requirements for Fire-Stopping Surveys?
Fire-stopping surveys sit inside several legal frameworks.
High risk buildings need design competency checks and Gateway approvals. Fire-stopping forms part of the submissions because it directly affects structural fire behaviour.
The Responsible Person must keep the building’s fire precautions in good condition. Any time a penetration or wall is altered the fire rating must be reinstated. A fire-stopping survey records the condition of those precautions.
This sets the minimum fire resistance needed for walls, floors, shafts and escape routes. Surveyors compare these requirements to what exists on site.
British and European test standards
EN 13501 and EN 1366 govern how products achieve fire ratings. Surveyors use this evidence to match the correct system to each penetration.
The Golden Thread
Every change to the building and every fire-stopping task must sit inside the digital record. A fire-stopping survey feeds into this record with accurate data.
Fire-stopping Surveys at GRJ Surveying
A fire-stopping survey only delivers safety when it’s carried out by a team with proven experience and accredited methods. GRJ Surveying has been delivering passive fire protection and compartmentation surveys since 2007 and has completed 1,000+ projects for our major clients.
Our surveys are backed by recognised third-party accreditations (IFC, ASFP, ISO 9001 and Cyber Essentials). Ready to make your building safer? Book a fire-stopping survey or contact us for advice.
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