Fire-rated sealing and fire stopping in Mill Hill, Greater London
Planning work on a service penetration in Mill Hill? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Fire seals cut back for extra cables and never reinstated
- Seals that don’t match their tested detail
- Penetration schedules that need working through
Fire stopping near Mill Hill
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Your questions answered
Does your area include sites such as Mill Hill Industrial Estate, near Mill Hill?
Yes. Estates, retail parks and business parks around Mill Hill, Mill Hill Industrial Estate among them, are all within reach. A few photos and the unit address let us price the work.
Can you work in a care home near Mill Hill with residents in?
Yes. We work around residents’ routines, a room or two at a time. Any site rules, from signing in to infection control, are agreed before we start.
What does an EI 60 rating mean?
BS EN 1366-3 covers penetration seals and BS EN 1366-4 covers linear joints. Results are classified under BS EN 13501-2, where E is integrity, I is insulation and the number is minutes, as in EI 60. The rating applies to the product as tested.
Do you design or specify fire stopping?
No. Deciding what is needed sits with the designer, fire engineer and building control. Our role is fitting the specified fire-rated sealant, following the maker’s tested details.
Do you guarantee your work?
Yes, for 12 months. If our installation fails in that time, we return and fix it.
What if there’s asbestos in the old mastic?
Asbestos is possible in some older mastics, particularly in buildings from before 2000. Before we disturb old sealant in an older building, we ask to see the asbestos register or survey, and if asbestos is suspected, work stops until it’s tested. We don’t remove asbestos-containing materials.
Which sealant will you use?
Where there’s a specification, we use the product it names. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.
Fire stopping for commercial buildings in Mill Hill
A fire-rated sealant is only one part of a tested system: its test evidence covers one product in one kind of wall or floor, with set services, gaps, depths and backing. Before we seal anything, we check the opening against the detail it is meant to follow, and we say so if it doesn’t fit. Most enquiries involve expanding foam used as fire stopping and fire stopping installed outside its tested range, across small duct penetrations where the tested detail allows, joints between fire-resisting walls and floors and linear gaps at wall heads. Most enquiries from Mill Hill start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.
In London, higher-risk residential buildings under the Building Safety Act bring extra scrutiny of fire-stopping records. We install what the designer or fire engineer has specified, and if you need records of the work, tell us and we’ll confirm with the quote.
The 12-month guarantee is for workmanship rather than wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we’re clear about what is covered before work starts.
- Where
- Mill Hill (NW7, N20)
- Region
- Greater London
- Guarantee
- 12 months on every job
- Quote
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Places near Mill Hill
Other services in Mill Hill
Compartment walls and floors in Mill Hill
With tenants changing and fit-outs following, London buildings see service routes altered again and again. Where fire-rated sealant is specified, we install it to the tested detail under the building’s permit-to-work arrangements. Fire stopping of openings and penetrations in England falls under Approved Document B. References to the older BS 476 classes are being removed from it from 2 September 2029, after which the European classification, BS EN 13501-2, is the route, subject to transitional arrangements. What we install is set by the specification, and it goes in to the tested detail.
At a healthcare site like BMI Hendon Hospital, 1.8 miles to the south of Mill Hill, new services through compartment walls are a constant, and each needs the specified seal. On estates like Mill Hill Industrial Estate (0.9 miles south-west of Mill Hill), the wall between office and warehouse is often fire-resisting, and cables through it need the specified seal. For a unit at a centre such as Broadwalk Centre, 2 miles to the west of Mill Hill, penetration seals are worth checking after each shop fit.
Mill Hill is about 1 mile north-east of Burnt Oak, in Greater London. We send applicators to Mill Hill for service penetrations. Mill Hill is one of 764 places we cover in Greater London for service penetrations. London is covered too, around 10 miles from Mill Hill.
We take on service penetrations across the NW7 and N20 postcode area, for business premises of every kind. We cover commercial and managed buildings on Daws Lane, Byron Road and High Street. Sites close to Mill Hill are covered too, including The Hale (1 mile west), Burnt Oak (1 mile south-west), Grahame Park (1 mile south), Totteridge (2 miles north-east) and Edgware (2 miles west). A short drive away, we cover London (10 miles south-east), City of Westminster (8 miles south-east), Marylebone (8 miles south-east), Kensington (8 miles south), St Pancras (8 miles south-east) and Shoreditch (9 miles south-east).
Around Mill Hill
In Mill Hill, that means premises near Mill Hill School, Copthall School and Bittacy Hill Park, among other places. Nearby too are Francis Skaryna Belarusian Library and Museum (2 miles east) and Rising Sun pub (0.7 miles north-west). The nearest railway station is Mill Hill Broadway station, roughly 1 mile south-west of the centre. Well-known places in the area include Broadwalk Centre (2 miles west) and Francis Skaryna Belarusian Library and Museum (2 miles east). For a walk, there’s The Mill Field and Darland's Lake.
Doing it in-house
The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.
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 usually costs more in the end than doing them right.
Work for main contractors and building owners
If you look after buildings for someone else, you need clear quotes and clear reporting. You get a fixed quote, an agreed scope and a walk round at the end.
Main contractors use us as their sealant subcontractor. We work to your programme, your specification and your site rules, and our applicators hold CSCS cards.
Why deal with it now?
An improvised seal can look finished while offering no tested performance. The fix is to remove it and reinstall to the detail. Getting scaffold, permits or access booked in Mill Hill takes effort, so while access is arranged it pays to renew all failing joints, not just the worst.
There’s no price list, since every building and every scope is different. For a fixed figure, call for a quote.
Why choose Mastic Doctor in Mill Hill
- One phone line for London, the South East and Scotland
- 12 months’ guarantee on every job
- Fully insured, including public liability cover
- CHAS accredited
See our cost guide and our accreditations.
Maintenance after handover
Once the work is signed off, a little attention goes a long way:
- Look above ceilings when tiles are lifted for other jobs
- File the specified details where the next contractor can find them
- Check with the data sheet before painting over fire sealant
- Have penetrations checked while they can still be seen
Never top up a fire seal with foam, ordinary silicone or filler. A repair should use the original product, installed the same way unless the designer specifies otherwise.
The simplest way to keep compartment walls intact is to plan fire stopping into every job that crosses them. Then the seal goes in while the area is open, not months later.
From enquiry to sign-off
We schedule the visit to fit the site hours and access windows you give us. On the day, the work area is kept contained and tidy, and your contact hears from us before we move to the next area. In Mill Hill, most buildings stay in use during the work, so zones and timings are agreed with whoever manages the building. Areas are handed back as each section is finished.
- The specification and schedule come first, so we know which details apply.
- We plan the sequence of floors, risers and voids with you.
- Each opening is checked for wall or floor type, service, gap and depth.
- Unsuitable material is removed and the opening cleaned.
- Backing and fire-rated sealant are installed to the detail and tooled.
- Anything outside the detail is reported to you rather than sealed.
Before we start on site
- Send asbestos survey details if the building is pre-2000
- Point out any areas we must not close
- Confirm the product named in the specification
Get a fixed quote
Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price against exactly what is specified. For smaller jobs, photographs and a description will do.
Read more
When something else is needed
Not every problem is a sealant problem, and we’d rather tell you before you spend money. It won’t fix:
- Walls or floors that aren’t fire-resisting to begin with
- Fire risk assessments, a job for a competent assessor
- Deciding what a wall or floor needs, which belongs to the designer
Not sure which it is? You can give us a call on 01277 525 020 or email the details over and we’ll tell you honestly.
Joints and surfaces we work on
- Linear gaps at wall heads
- Joints between fire-resisting walls and floors
- Small duct penetrations where the tested detail allows
- Pipe penetrations
- Service gaps in risers
- Cable penetrations