Greater London · England
Fire Rated Sealant in Haverstock
Intumescent and fire-rated sealant around gaps, frames and service penetrations for Haverstock, backed by a 12-month guarantee. Ask us for a quote.
- Fire seals that have cracked with movement
- Unsealed gaps where pipes and cables go through a wall
- Joints picked up in a fire-stopping survey
Commercial buildings in Haverstock
Commercial buildings in London often have strict access rules and limited loading, and out-of-hours working is possible to arrange. In England, the Regulatory Reform (Fire Safety) Order 2005 requires a fire risk assessment for workplaces and for the common parts of blocks of flats, and gaps around services are often picked up there. We work to the specification you’re given, installing the product to its tested details.
Schools such as Fine Arts College are buildings too, and gaps opened by contractors for new cabling are a common finding in schools and offices. Letting a property close to South Hampstead station? Then fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through.
Haverstock is about 1 mile south-east of Hampstead, in Greater London. Our applicators cover fire rated sealant for householders, landlords and businesses in Haverstock and nearby. Across Greater London, we cover 764 places, and Haverstock is one of them.
Our applicators cover all of NW3, NW5 and NW1 for fire rated sealant and the streets around it. That includes homes and businesses on Eton Road, Lawn Road and Ornan Road. Other places close to Haverstock include Belsize Park (1 mile north), Primrose Hill (1 mile south), South Hampstead (1 mile west), Swiss Cottage (1 mile west) and Chalk Farm (1 mile east). We also work in nearby towns such as London (4 miles south-east), Kensington (4 miles south-west), Shoreditch (4 miles east), Walthamstow (7 miles north-east), Hoxton (3 miles east) and Whitechapel (4 miles south-east).
Near you in Haverstock
Around Haverstock, our work takes us to homes and buildings near Cecil Sharp House, Primrose Hill and St. Mary's Town and Country School, among other places. Nearby too are St Paul's Church of England Primary School (under half a mile south) and The Washington pub (within half a mile north). The closest station to Haverstock is South Hampstead station, roughly 0.7 miles west of the centre. A little further out are Wellington Hospital (0.9 miles south-west) and Isokon Gallery (0.5 miles north). Not far away are Adelaide Nature Reserve and Primrose Hill.
Fire rated sealant in Haverstock, done properly
Until it’s heated, intumescent sealant behaves like an ordinary sealant; then it swells to help close the gap. The right product depends on the gap size, the substrate and what passes through, so we work to the manufacturer’s details. Common call-outs are for linear gaps at the head of walls and standard silicone or caulk in a fire-stopping gap, on service penetrations, door frames and plasterboard & masonry.
Across London, offices, shops, hotels, student halls and blocks of flats all need sealant work from time to time, from washroom silicone to fire-rated sealant around pipes and cables passing through walls. Out-of-hours working can be arranged where a building in Haverstock can’t close.
You are covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or email us.
- Where
- Haverstock (NW3, NW5, NW1)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Haverstock
Also in Haverstock
Haverstock questions
Do you work for landlords with property near South Hampstead station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before we start.
Is parking a problem for a job in Haverstock?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Will we have a record of what was sealed?
Yes. You get a list of where we worked and what we used.
Can you work in occupied buildings?
Yes. We work in flats, HMOs, schools, offices and other commercial buildings, including occupied ones. The order of work and access are planned with you.
Where are you based?
Mr Mastic is based in Crawley. We cover Haverstock and the rest of Greater London, along with the rest of our area.
Do you do fire sealant around door frames?
Yes. We seal the gap between the frame and the wall with a suitable fire-rated product. The door leaf and its hardware need a door specialist.
How long will you be here?
Most jobs take a few hours for a handful of gaps, and longer for a whole building, including the preparation. Your quote will say how long we expect yours to take.
Do you take out the old sealant first?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Surface by surface
Plasterboard walls
Service holes in plasterboard are often rough and oversized. Gaps that are too big for sealant alone need a different detail, and we will tell you.
Service penetrations
Different services need different details: metal pipes, cables and plastic pipes are not treated the same. We follow the manufacturer’s tested detail for each, and tell you if sealant alone isn’t the right fix.
Keeping the joints in good condition
So the new joints stay in good condition:
- Allow for resealing whenever new services are run
- Get damaged fire seals looked at promptly
- Check whether a sealant can be painted before decorating over it
- Look in service cupboards and ceiling voids from time to time
Follow the cure time we give you before decorating over the sealant. Some fire-rated sealants can be painted and some cannot and we’ll tell you which one you have.
An open gap isn’t only a fire issue: they also let noise, draughts and sometimes pests through. Dealing with them early helps with all of these.
What happens if it’s left?
An open gap in a fire-resisting wall is a route for smoke and fire. Sealing it properly restores what the wall was there to do, and the sealing itself is often a contained piece of work. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Haverstock.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why choose Mr Mastic in Haverstock
- Tidy, careful work
- Sanitary silicone with an anti-fungal additive in wet areas
- Approved under the ARBOMaster scheme
- Trusted Arbo and Everbuild sealants
Read what affects the cost or what customers say.
When to call us in Haverstock
Buildings are refitted and reconfigured over the years. Conversions to flats and HMOs, and office refits, create new walls and new routes for services, with gaps to match.
Look out for any of the following:
- Unsealed gaps where pipes and cables go through a wall
- Open gaps behind door architraves
- Holes left by a change of layout
- Seals cut through by electricians, plumbers or data installers
For buildings such as Church of St Mary the Virgin, gaps around pipes and cables are worth checking after any building work there.
Comparing quotes
- Whether all the old sealant comes out first
- Which colour the sealant will be
- What product goes in the joint
- How the joint is cleaned and prepared
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Sign-off of the building, which sits with building control or your assessor
- Fire risk assessments, which need a qualified assessor
- A wall that is not a fire-resisting element to begin with
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Where we work in Haverstock
- Service penetrations
- Plasterboard & masonry
- Door frames
- Linear gaps
- Flats & HMOs
- Pipe & cable gaps
The process
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours for a handful of gaps, and longer for a whole building, depending on the size of the job. In Haverstock, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Access to each area is agreed so the work can run in order.
- Old, damaged or unsuitable sealant is removed.
- Gaps are cleaned of dust and loose material.
- The fire-rated or intumescent sealant is applied and tooled to the tested detail.
- Locations and products are written up and any gaps unsuitable for sealant are flagged.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Plan for the work area to be out of bounds to pets and children
- Clear the area around the work
How to get a quote
Want a quote for fire rated sealant? Please phone 0345 464 0079 or email us with a few details. We’ll explain what we’d do and give you a clear quote before any work starts.
Advice
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Housing providers, facilities teams and property managers book us too in Haverstock and across Greater London. Several sites can be quoted together, and we are fully insured.