Greater London · England
Herne Hill Fire Rated Sealant
Our applicators work in Herne Hill on intumescent and fire-rated sealant around gaps, frames and service penetrations. Old material cut out, joints cleaned and sealed neatly.
- Joints picked up in a fire-stopping survey
- Old fire sealant that has split or come away
- Fire stopping disturbed by later work
The process
You do not need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the job takes a few hours for a handful of gaps, and longer for a whole building for a typical job. For a job in Herne Hill, parking and access are the things to plan: let us know about parking, the floor we will 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 and the gap cleaned.
- The specified fire-rated sealant goes in over any backing its detail requires.
- Every location is recorded with the product used for your files.
How to prepare
- For business premises, tell us about site rules or sign-in
- Tell us about any water getting in
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
If you’re in Herne Hill and need fire rated sealant, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
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How we handle fire rated sealant in Herne Hill
Deciding which gaps need fire stopping isn’t our role; your assessor, designer or building control sets that out. Our part is applying the specified sealant carefully, to the right depth and with the right backing. Common call-outs are for gaps where walls meet ceilings or slabs and open gaps behind door architraves, across door frames, plasterboard & masonry and flats & HMOs.
London’s offices, shops, hotels, student accommodation and blocks of flats all have joints to look after, whether that is washroom resealing or fire-rated sealant around service openings. Out-of-hours working can be arranged where a building in Herne Hill cannot close.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Herne Hill (SE22, SW2, SE24)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Herne Hill
Sealant applied too thin, without the backing its detail needs, or onto dust won’t perform as it was tested. We see plenty of fire stopping that was hurried particularly when it was the last job before handover.
Any of these means the joints need attention:
- Unsealed gaps where pipes and cables go through a wall
- Holes left by a change of layout
- Gaps filled with a product that is not fire-rated
- Gaps flagged on a fire risk assessment
For site and facilities teams at buildings such as Judith Kerr Primary School, fire-stopping around service openings should be restored whenever new services go in.
What to look for in a quote
- What happens if they find a problem under the old sealant
- What the cure time is
- What insurance they hold
- What product goes in the joint
Nearby places to Herne Hill
What else we do in Herne Hill
How we quote for fire rated sealant
The price is agreed before any work begins. It’s based on:
- Which sealant suits the joint
- Working hours on commercial sites
- Mould in or behind the old joints
- The number of rooms or windows
Leaving a failed joint usually makes the job bigger, not smaller. If you’re unsure, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
What to tell us for a quote
What to tell us when you ask for a quote:
- Any previous sealing or DIY work
- The rough size of the job
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or email us.
Why it’s worth doing now in Herne Hill
Leaving a gap until a refurbishment comes round can mean years with it open. Sealing the gap now is a contained job on its own. 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.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Why choose Mr Mastic in Herne Hill
- We leave the area clean and tidy
- We never seal over old sealant
- An ARBOMaster approved applicator
- Anti-fungal silicone where joints get wet
See what affects the cost and customer reviews.
Questions from Herne Hill
Is parking an issue for fire rated sealant in Herne Hill?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
I let a flat near North Dulwich station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners. You can ring 0345 464 0079 or email us with the details for a clear quote.
Do you offer different sealant colours?
Generally, yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before any work starts.
Do you have insurance?
Yes. Mr Mastic is fully insured.
Will you assess my building’s fire safety?
No. We work from the specification you give us, and apply each product to its tested details.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Is standard sealant good enough for a fire gap?
No. Ordinary silicone, caulk or foam is not tested as fire stopping. We cut it out and reseal with a fire-rated product.
What the job involves on each surface
Linear gaps
Long, narrow gaps appear where walls meet slabs and ceilings. We seal them to the tested detail, with backing where it’s needed.
Plasterboard walls
Plasterboard partitions are common in flats, offices and conversions. The sealant has to be one tested in plasterboard for the gap we are sealing.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
DIY versus a professional finish
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Workplaces and buildings in Herne Hill
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. Many London buildings have tight access and loading restrictions, and out-of-hours working is possible to arrange.
If you look after a church, hall or community building such as Saint Faith's, service openings in its walls need the right fire-rated sealant, as in any building. Herne Hill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Herne Hill is about 3 miles south of London, in Greater London. If you need fire rated sealant in Herne Hill, please phone 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover Greater London. 764 places in Greater London are on our list, from the larger towns to small villages.
Work in SE22, SW2 and SE24 is quoted and booked the same way as anywhere else. Fire rated sealant is available to properties on Jelf Road, Dewey Lane and Talma Road and the roads around them. Being close to the A204 and A2214, Herne Hill is easy for our applicators to reach for fire rated sealant. Nearby, we also carry out fire rated sealant in Dulwich Village (1 mile south-east), East Dulwich (1 mile north-east), Dulwich (1 mile south-east), Denmark Hill (1 mile north) and Camberwell (1 mile north). Within a short drive, we also cover London (3 miles north), City of Westminster (5 miles north-west), Marylebone (5 miles north-west), Kensington (6 miles north-west), St Pancras (5 miles north) and Shoreditch (5 miles north).
Landmarks near Herne Hill
Around Herne Hill, our work takes us to homes and buildings near The Charter School, Half Moon pub and Belair Park and the streets around them. Herne Hill has its own railway station: North Dulwich station. Well-known places in the area include Surrey Quays Shopping Centre (3.5 miles north-east) and House of Dreams Museum (0.7 miles north-east). Open spaces near Herne Hill include Battersea Park Lake and Knight's Hill.