Fire-rated sealing and fire stopping in Harefield, Greater London
Need fire stopping in Harefield? Send us the details for a fixed quote, backed by a 12-month guarantee on the work.
- Seals disturbed by maintenance and left open
- Unsealed openings around new pipes and cables
- Seals that don’t match their tested detail
Fire stopping in Harefield
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
About our fire stopping in Harefield
It helps to set out our role at the start. The designer, fire engineer or building control decides which fire stopping is required. We fit the specified fire-rated sealant following that specification and the maker’s installation guidance. We work on linear gaps at wall heads, joints between fire-resisting walls and floors and service gaps in risers, and the failures we are asked to look at most are penetration schedules that need working through and head-of-wall gaps with no fire seal. Facilities teams, main contractors and managing agents in Harefield tend to want the same three things: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
Fit-outs and M&E works in London buildings often leave service penetrations open behind ceilings and in risers. Fire-rated sealant goes in where it’s the specified item; where a collar, wrap or batt is called for instead, we flag it.
Our workmanship is guaranteed for 12 months. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Where
- Harefield (UB9)
- Wider area
- Greater London
- Guarantee
- 12 months on every job
- Quote
- Quoted before any work starts
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Looking after the joints
A few simple habits keep the new joints working:
- Settle who seals which penetrations at the start of a project
- Keep product data and details in the fire safety file
- Brief every trade that openings they make must be sealed
- Check risers and ceiling voids after each round of works
Store the specified product details somewhere the next contractor can find them. Anyone resealing later needs to know which product and detail were used.
The simplest way to keep compartment walls intact is to plan fire stopping into every job that crosses them. That way the opening is sealed while the trade and access are still there, not months later.
Work for main contractors and building owners
We take on planned maintenance as well as one-off repairs: resealing failed joints building by building, on a schedule that suits your budget. Sites in Harefield can sit alongside others in a wider programme across Greater London.
CHAS accredited and a Constructionline member, we’re straightforward to vet for your supplier list. We are fully insured, and our insurance certificate can go with the quote.
Our process
Before we leave any area, we remove the tape, clean down and inspect every joint with your site contact. If an area should be left alone while the sealant cures, we say how long and put signs out. Most London premises stay occupied while we are on site, so zones and timings are agreed with whoever manages the building. Phased work keeps the rest of the building in use.
- We read the specification, drawings or penetration schedule you send and raise any questions before we price.
- Every penetration is compared with its detail: wall or floor type, service, gap size and depth.
- Anything that doesn’t belong in the opening, such as expanding foam or general-purpose filler, is removed.
- We fit the backing the detail asks for, to the stated depth.
- Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
- Openings that need a collar, wrap, batt or other product are flagged to you rather than filled with sealant.
Getting the site ready
- Make sure the joints can be reached
- Send any specification or drawings in advance
- Tell us your opening times and when work is allowed
Quotes
Specifications, drawings and tender packages are welcome with any enquiry, and we will price against exactly what is specified. Smaller jobs need nothing more than photographs and a few notes.
Related advice
Questions about Harefield
Can you take on a job at a hospital such as Harefield Hospital?
Yes. We work in healthcare settings as well as offices and schools. We follow the site’s permits, sign-in and infection-control procedures in every area.
Do you take on jobs in Harefield where loading and access are tightly controlled?
Yes, we plan every London job around the building’s own access rules. Share the building’s contractor rules and we’ll work to them. We allow for the ULEZ, which covers every borough
Which sealant will you use?
The specification comes first, if there is one. If there isn’t one, it comes down to the joint: how much it moves, what it bonds to and whether it’s wet, trafficked or fire-rated.
Do you cover Harefield?
Yes. Harefield is in our area and the rest of Greater London, within our coverage of Greater London, South East England and Scotland. For a quote, call 01277 525 020 or email the details over.
What site paperwork can you supply?
Requirements differ from site to site, so tell us what you need and we will confirm it when we quote.
Can you fire stop behind the services contractors?
Yes, provided a specification covers them. Openings left by new services are among the most common jobs we see, and we reseal them to the specified detail.
What do BS EN 1366-3 and BS EN 13501-2 mean?
The tests are BS EN 1366-3 for penetrations and BS EN 1366-4 for linear joints, and classification is to BS EN 13501-2. EI 60 means integrity and insulation for 60 minutes in the tested arrangement; installing to the detail is what carries that across to site.
General trades versus a specialist
Certain joints really need a specialist: for instance fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong typically costs more in the end than doing them right.
Paperwork matters too. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we will confirm the paperwork you need with the quote.
Places near Harefield
Other services in Harefield
Different surfaces, different methods
Masonry and concrete
Core-drilled holes are neat; broken-out ones rarely are. Each gap is measured where it is widest so we know it sits within the tested range, and any that don’t are flagged.
Plastic pipes
Plastic waste pipes through slabs come up often. The detail decides whether sealant alone is enough, and we won’t substitute it for a specified collar.
Fire-rated sealing for Harefield buildings
With tenants changing and fit-outs following, London buildings see service routes altered again and again. Penetrations are sealed with the specified product, to its tested detail, under the building’s own permit rules. Three care or nursing homes sit less than 2 miles from Harefield. In a care home, any new pipe or cable through a fire-resisting wall should be sealed to the specified detail.
For a unit at a site such as Woodcock Hill Industrial Estate (1.3 miles north of Harefield), new power or data runs between office and warehouse can breach a compartment wall. At a university such as Buckinghamshire New University, which lies south of Harefield, labs, lecture blocks and residences are re-serviced often, so penetration seals are best checked after M&E work.
Harefield is about 3 miles south of Rickmansworth, in Greater London. Anywhere in UB9, the process is the same: send details, get a fixed quote, we seal, and the work is guaranteed. Our Greater London coverage takes in 764 places. We also cover London, around 18 miles from Harefield.
Business premises anywhere in UB9 are within our area. If your site is on High Street, Vernon Drive and New Park Road or close by, send details and we’ll quote for service penetrations. Just outside Harefield, we also work in Hill End (1 mile north), Woodcock Hill (1 mile north-east), Batchworth Heath (2 miles north-east), Batchworth (2 miles north-east) and Mill End (2 miles north). Bigger towns within reach include City of Westminster (15 miles south-east), Kensington (14 miles south-east), Hampstead (13 miles east), Ruislip (4 miles south-east), Ealing (10 miles south-east) and Hayes (7 miles south-east).
Landmarks near Harefield
Recent enquiries here include premises near The King's Arms Public House, The Green and The Harefield Academy and the streets around them. The closest station to Harefield is Denham station, about 2 miles south of the centre. Other landmarks nearby include Chiltern Open Air Museum (3.4 miles north-west) and Harefield Hospital (under half a mile north-west). Green spaces nearby include Dews Farm Sand Pits and Horse Shoe Bay.
Common problems we fix in Harefield
Physical damage is another reason seals stop doing their job. Maintenance work can knock a seal, cut it back for an extra cable or remove it with an old pipe, and the repair is often skipped.
Typical triggers for a call:
- Fire sealant pulled out of the opening
- Open linear gaps along the top of fire-resisting walls
- Builders’ foam or ordinary silicone in compartment walls
- Fire stopping installed outside its tested range
On a hospital site such as Harefield Hospital, less than half a mile north-west of Harefield, fire-rated sealant goes in where the specification calls for it, with the work planned around the estates team’s permits.
What your quote should include
- Their plan for phasing and protecting the area
- The terms of the workmanship guarantee
- Whether primer will be used where the manufacturer specifies it
- The named product and why it was chosen