Greater London · England
Fire-rated sealant in Islington, Greater London
Intumescent and fire-rated sealant around gaps, frames and service penetrations for homes and businesses in Islington and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Unsealed gaps around fire door frames
- Damaged fire sealant left by other trades
- Open joints along the top of partitions
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Tell trades working in the building that fire seals must be put back
- Keep general-purpose foam and caulk away from fire-stopping gaps
- Check whether a sealant can be painted before decorating over it
- Photograph sealed gaps before they’re covered up
Follow the cure time we give you before decorating over the sealant. Some fire-rated sealants can be painted and some can’t, so ask us which we used.
Leave a fire-stopping gap open and smoke can move through the building much more easily. Sealing it early is a simple step to take.
Fire rated sealant for homes and businesses in Islington
Fire stopping only performs as intended if it’s done to the detail: the right depth, the right backing and the right product for the substrate. That detail is what we take care over. Typical jobs include fire seals that have cracked with movement and gaps flagged on a fire risk assessment, on service penetrations, plasterboard & masonry and linear gaps.
In London, a commercial job often starts with access: loading bays, building rules and lifts. For a building in Islington, we agree timings and access before anything starts.
All our work is covered by our one-year guarantee, wherever you are in Greater London.
- Place
- Islington (N1, N7, NW1, EC1V)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Linear gaps
Gaps along the top of partitions are easy to miss above a ceiling. We seal them along their full length leaving no stretch unsealed.
Plasterboard walls
We check that the board around the gap is sound. Crumbling edges are cleaned back before the sealant goes in.
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Islington: your questions answered
Do you take on hotel work around Islington?
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.
Is parking an issue for fire rated sealant in Islington?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Do you come to Islington?
Yes. We work in Islington and the rest of Greater London, as part of our work across South East England, London and Scotland. For a quote, ring 0345 464 0079 or email us.
Can you match the sealant colour?
In most cases you can choose. We’ll explain which colours are available and agree one before we start.
Can you give us a record of the work?
Yes. We record the locations we’ve sealed and the products used for your files.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can I use normal mastic around a pipe through a fire wall?
No. Ordinary silicone, caulk or foam is not tested as fire stopping. We cut it out and reseal with a fire-rated product.
Where is Mr Mastic based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
The process
The work is kept neat and contained to the joints we are treating, so you can carry on as normal. Expect the work to take a few hours for a handful of gaps, and longer for a whole building. For a job in Islington, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- 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.
- The specified fire-rated sealant goes in over any backing its detail requires.
- Every location is recorded with the product used.
Preparing for the visit
- Tell us if parking is tricky
- Let us know about earlier repairs to the joints
- On commercial sites, let us know about site rules
Getting a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Related advice
When to call us in Islington
Gaps around door frames are easily missed. The architrave hides the gap between frame and wall, so it can be left open when a door is replaced.
These are the problems we are asked about most:
- Fire stopping disturbed by later work
- Gaps flagged on a fire risk assessment
- Unsealed gaps around fire door frames
- Cracked or shrunken fire-rated sealant
Community buildings like St Mary's Church are part of the picture too: service openings in its walls need the right fire-rated sealant, as in any building.
What your quote should include
- What product goes in the joint
- What insurance they hold
- What happens if they find a problem under the old sealant
- Whether they seal over old material or remove it
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
For anyone letting property in or around Islington, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
What fire rated sealant looks like in Islington
There are hotels and other places to stay in and around Islington. For hotels, a room-by-room programme keeps most rooms in use while the work goes on. Commercial buildings in London often have strict access rules and limited loading, and out-of-hours working is possible to arrange.
Letting a property close to Essex Road station? Then any gap left by new services in shared walls should be closed with a fire-rated product. If you look after a building such as Islington Proprietary School, fire-stopping around service openings should be restored whenever new services go in.
Islington is about 3 miles north-east of City of Westminster, in Greater London. Islington gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Greater London coverage runs to 764 places, Islington among them.
We work across the N1, N7, NW1 and EC1V postcode area for fire rated sealant. We cover properties on Gibson Square, Old Royal Free Square and Cloudesley Square and the roads around them. With the B515 and A5203 close by, Islington is easy for our applicators to reach for fire rated sealant. We also cover the places around Islington: Pentonville (1 mile south), Angel (1 mile south), Barnsbury (1 mile north-west), Clerkenwell (1 mile south) and Lower Holloway (1 mile north-west). Larger places within reach include London (3 miles south), City of Westminster (3 miles south-west), Kensington (5 miles south-west), Walthamstow (5 miles north-east), Hampstead (3 miles west) and Ruislip (13 miles west).
Local landmarks in Islington
We work in homes and buildings around Islington Green School, The King's Head Public House and Pilsudski Institute of London, among other places. You’ll also find Barnard Park (under half a mile south-west) and St Mary's CofE Primary School (within half a mile east). There’s a railway station in Islington itself: Essex Road station. Other landmarks nearby include King's College Hospital Charity (0.7 miles north-west) and Montfichet's Tower (1.7 miles south). Open spaces near Islington include Barnsbury Wood and Ludgate Hill.
What happens if it’s left?
An open gap in a fire-resisting wall is a route for smoke and fire. A proper seal lets the wall do its job again, and the sealing itself is often a contained piece of work. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
The cost depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
Why book with us
- Full insurance on every job
- Over 20 years’ experience
- ARBOMaster approved applicator
- Tidy, careful work
Read our cost guide and customer reviews.