Greater London · England
Highgate Fire Rated Sealant
Intumescent and fire-rated sealant around gaps, frames and service penetrations for homes and businesses in Highgate and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Old fire sealant that has split or come away
- Sealant items on a fire risk assessment action list
- Gaps around pipes and cables through fire-resisting walls
Fire rated sealant in Highgate, done properly
A gap around a door frame, a linear joint at the head of a wall and a hole round a pipe are each sealed differently. Measuring the gap and checking what it’s made of comes first, then apply it to the depth its tested detail calls for. Typical jobs include open gaps behind door architraves and linear gaps at the head of walls, across service penetrations, plasterboard & masonry and door frames.
Commercial work in London comes with its own logistics: loading restrictions, building rules and tight access. For a building in Highgate, we agree timings and access before anything starts.
Our work is backed for twelve months, in Highgate and everywhere else we cover.
- Where
- Highgate (N6, N19, NW5)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
In fairness, there are a few things sealant won’t fix:
- A wall that is not a fire-resisting element to begin with
- Issuing a fire rating or certificate for a building
- Fire risk assessments, which need a qualified assessor
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly before booking.
What we seal
- Door frames
- Flats & HMOs
- Pipe & cable gaps
- Service penetrations
- Plasterboard & masonry
- Linear gaps
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
How the job changes by surface
Service penetrations
New gaps tend to show up where services have been added. Old or unsuitable filler comes out before the right sealant goes in over any backing the detail calls for.
Masonry and concrete
For masonry and concrete, we use a product tested in that substrate. We clean out dust and debris before sealing so the seal has something sound to bond to.
Workplaces and buildings in Highgate
Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, which is often where open fire-stopping gaps are first noticed. We apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details. Commercial buildings in London often have strict access rules and limited loading, and out-of-hours working is possible to arrange.
If you look after a church, hall or community building such as Highgate United Reformed Church, gaps around pipes and cables are worth checking after any building work there. Schools such as St Michael's Church of England Primary School are buildings too, and gaps opened by contractors for new cabling are a common finding in schools and offices.
Highgate is about 2 miles north-east of Hampstead, in Greater London. Wherever you are in the N6 postcode area, we cover fire rated sealant for homes and businesses. We cover 764 towns and villages across Greater London, from the larger towns to small villages.
Every address in N6, N19 and NW5 is covered for fire rated sealant. If you need fire rated sealant at a property on Wood Lane, Grange Road and Talbot Road or anywhere close by, our applicators can take on the job. We also cover Upper Holloway (1 mile south-east), Dartmouth Park (1 mile south), Lissenden Gardens (1 mile south), Crouch End (1 mile north-east) and Tufnell Park (1 mile south-east). Further out, we also cover London (5 miles south-east), City of Westminster (4 miles south), Marylebone (4 miles south), Kensington (6 miles south-west), St Pancras (3 miles south) and Shoreditch (4 miles south-east).
Landmarks near Highgate
Typical jobs here are in homes near The Angel Inn, St Aloysius RC College and Whittington Park. For rail, the closest station is Upper Holloway station, roughly 0.9 miles south-east. Nearby you’ll also find Highgate Private Hospital (0.6 miles north-west) and Montfichet's Tower (4.4 miles south-east). Not far away are Darland's Lake and Parkland Walk.
Also near Highgate
More services for Highgate
How we quote for fire rated sealant
You’ll get a clear quote before we start. It’s based on:
- The number and length of the joints
- Any mould that needs treating
- The product the joint needs
- Whether old sealant or filler has to be cut out
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
When you call or email, these details help:
- Where the property is
- Whether it has been sealed before
- How we’d reach the joints
- The type of property
If you’re in Highgate and need fire rated sealant, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
What happens on the day
We keep the work tidy and contained to the joints we’re treating. Expect the work to take from a few hours to a few days, depending on the number of gaps and the access, and we tell you how long to leave it before we go. In a London area like Highgate, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- Access to each area is agreed so the work can run in order.
- We take out any damaged or unsuitable sealant.
- Dust and loose debris are cleaned from each gap.
- The fire-rated or intumescent sealant is applied and tooled to the tested detail.
- We record what was done and flag anything that needs a different system.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
How to get a quote
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Advice
Your questions about fire rated sealant in Highgate
I let a flat near Upper Holloway station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear price.
Is Highgate in your area for fire rated sealant?
Yes, Highgate is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job.
Do you have insurance?
Yes. Full insurance covers our work.
Will you assess my building’s fire safety?
No, we do not assess buildings. When your assessor or designer has set out what’s needed, we can quote for the fire-rated sealant items.
Can you tell me how many minutes the seal will last?
Ratings and certification sit with the product’s test evidence and whoever specified the work. Our part is installing the specified product to its tested details and list the locations and products for you.
Will the old sealant be removed?
Yes, always, and completely. New sealant won’t bond properly to old, so the joint is cleaned back first.
Where are you based?
Mr Mastic is based in Crawley. We cover Highgate and the rest of Greater London, along with the rest of our area.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Signs you need fire rated sealant in Highgate
Gaps around door frames are easily missed. The architrave hides the gap between frame and wall, so it’s easy to leave unsealed when doors are changed.
These are the problems we’re asked about most:
- Seals cut through by electricians, plumbers or data installers
- Unsealed gaps where pipes and cables go through a wall
- Sealant items on a fire risk assessment action list
- New service routes left unsealed after building work
As a London address, Highgate can be tricky for parking: let us know about parking bays, permits or a driveway.
Comparing quotes
- What guarantee comes with the work
- Who turns up on the day
- What insurance they hold
- How the surfaces are prepared before sealing
Why it’s worth doing now in Highgate
For some gaps, sealant isn’t the right answer and another system is needed. Large holes, cable bundles and plastic pipes can call for batts, collars or wraps. If a gap is not suitable for sealant, we’ll tell you. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Highgate.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part.
Why book with us
- Arbo and Everbuild products
- We never seal over old sealant
- Rated 4.9 stars on Google
- Homes, businesses and hotels
Read our cost guide or our reviews.