Greater London · England
Fire-rated sealant in St Pancras, Greater London
Our applicators work in St Pancras on intumescent and fire-rated sealant around gaps, frames and service penetrations. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Gaps around pipes and cables through fire-resisting walls
- Open gaps behind door architraves
- Linear gaps at the head of walls
How we handle fire rated sealant in St Pancras
Ordinary silicone or decorators’ caulk in a fire-stopping gap is not a fire-rated seal. We cut out the wrong material and reseal with a fire-rated product tested for that kind of gap. Typical jobs include open gaps behind door architraves and gaps where walls meet ceilings or slabs, across service penetrations, plasterboard & masonry and flats & HMOs.
In London, a commercial job often starts with access: loading bays, building rules and lifts. For a building in St Pancras, we agree timings and access before anything starts.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- St Pancras (NW1W, W1T, N1)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
Nearby places to St Pancras
What else we do in St Pancras
Questions from St Pancras
Is parking an issue for fire rated sealant in St Pancras?
Parking in St Pancras, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do you take on hotel work around St Pancras?
Yes, hospitality work, including hotels, is part of what we do. Work can be planned room by room, and out-of-hours working can be arranged.
What does intumescent mean?
Fire-rated is the broad term for sealants tested for fire stopping. Intumescent types expand when heated, and they’re one option among several. The specification and the tested detail decide which is used.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
Is standard sealant good enough for a fire gap?
No. It looks sealed but will not perform as fire stopping. A tested fire-rated product is needed, or ask us to do it.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Do you do fire sealant around door frames?
Yes. Gaps behind architraves are a common job for us. The door and its fittings are a separate job for a door specialist.
What sealant work can’t fix
Some problems need a builder, plumber or other trade rather than us:
- Problems with the door itself rather than the gap around the frame
- A wall that is not a fire-resisting element to begin with
- Assessing a building’s fire safety
If you’re not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
Surfaces we seal
- Pipe & cable gaps
- Plasterboard & masonry
- Service penetrations
- Linear gaps
- Door frames
- Flats & HMOs
Leave it or put it right?
If an assessor has flagged gaps, it makes sense to close them before the next review. Having them sealed and recorded now means you can show the action was taken. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in St Pancras, the repair is bigger than a sealant job.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
Why choose Mr Mastic in St Pancras
- Any old sealant cut out fully, not covered over
- Trusted Arbo and Everbuild sealants
- An ARBOMaster approved applicator
- Full insurance on every job
Take a look at how sealant jobs are priced and what customers say.
Common problems we fix in St Pancras
Lots of unsealed gaps appear long after the building was completed. Electricians, plumbers and data installers drill through walls and ceilings and the hole they leave doesn’t always get resealed.
These are the problems we are asked about most:
- Seals cut through by electricians, plumbers or data installers
- Cracked or shrunken fire-rated sealant
- Unsealed gaps where pipes and cables go through a wall
- Joints picked up in a fire-stopping survey
St Pancras is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
What to look for in a quote
- How long the guarantee is
- What happens if they find a problem under the old sealant
- Which colour the sealant will be
- What preparation is included
Looking after it afterwards
After the cure time, these simple habits help:
- Allow for resealing whenever new services are run
- Keep the record of products and locations with your fire safety documents
- Ask every contractor to reseal any fire stopping they disturb
- Look in service cupboards and ceiling voids from time to time
Look at the sealed gaps as part of your routine walk-rounds. Look for cracks, gaps or sealant that has been cut or pulled out and get them seen to.
When you plan work that goes through walls or ceilings, plan the fire stopping too. Doing it at the time avoids leaving gaps behind.
How the visit works
On the day, we look over the joints with you first, so you know exactly what we are doing. We protect the surfaces around the joints before work begins. The work generally takes a few hours for a handful of gaps, and longer for a whole building. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We begin by agreeing the list of gaps from your assessor’s or designer’s requirements.
- Each gap is measured and its substrate and service noted.
- Any non-fire-rated filler is removed and the faces cleaned.
- We fit backing where needed and apply the fire-rated sealant to depth.
- We hand over a list of locations and products.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Mention any tricky access
- Clear items away from the joints we’re working on
How to get a quote
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before any work starts.
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Workplaces and buildings in St Pancras
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. There are hotels and other places to stay in and around St Pancras. Hotel work can be planned room by room, with out-of-hours working where needed.
Managing a site like St George the Martyr Church of England Primary School? Then gaps opened by contractors for new cabling are a common finding in schools and offices. Community buildings like Lumen United Reformed Church are part of the picture too: service openings in its walls need the right fire-rated sealant, as in any building.
St Pancras is about 2 miles north-west of London, in Greater London. St Pancras gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our Greater London coverage runs to 764 places, and St Pancras is one of them.
Work in NW1W, W1T and N1 works the same way as everywhere else we cover. We cover properties on Shoe Lane, Long Lane and City Road and the roads around them. St Pancras is on the A4 and A40, which makes it straightforward to reach with everything needed for fire rated sealant. Neighbouring places we cover for fire rated sealant include Bloomsbury (1 mile south-west), Kings Cross (1 mile north-west), Holborn (1 mile south-east), Clerkenwell (1 mile east) and Angel (1 mile north-east). We also work in nearby towns such as Kensington (4 miles south-west), Walthamstow (6 miles north-east), Hampstead (3 miles north-west), Ruislip (13 miles west), Brompton (3 miles south-west) and Stockwell (4 miles south). St Pancras is among the bigger towns we cover in Greater London.
Around St Pancras
Locally, jobs take us to homes and businesses close to Lincoln's Inn Fields, City Academy and Elizabeth Garrett Anderson School and the streets around them. Also close by are Pilsudski Institute of London (less than half a mile south-west) and Calthorpe Arms Public House (within half a mile south-east). The nearest railway station is London Kings Cross station, about 0.5 miles north-west. Nearby you’ll also find Montfichet's Tower (1.1 miles south-east) and Royal National Throat (within half a mile north). Green spaces nearby include Barnsbury Wood and Ludgate Hill.
Surface by surface
Masonry and concrete
Core-drilled and broken-out holes in concrete are often irregular. We measure the gap at its widest point to make sure it suits the product.
Plasterboard walls
We check that the board around the gap is sound. Loose material is removed so the sealant has a firm edge.