Greater London · England
Fire-rated sealant in Netherne on-the-Hill, Greater London
Problem with your fire-stopping gaps in Netherne on-the-Hill? We cut out the old, prepare the joints and apply the right sealant.
- Fire seals that have cracked with movement
- Unsealed gaps around fire door frames
- Sealant items on a fire risk assessment action list
Fire rated sealant for Netherne on-the-Hill homes and businesses
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Store the list of sealed gaps with your building paperwork
- Include fire stopping when you schedule refits
- Tell trades working in the building that fire seals must be put back
- Do not fill fire-stopping gaps with ordinary foam or silicone
Let contractors know where fire stopping has been done, and ask them to reseal anything they cut through. Later work is a common cause of damaged fire stopping.
A gap left open in a fire-resisting wall or floor lets smoke spread in ways the building wasn’t designed for. Closing it is generally a straightforward job.
Fire rated sealant in Netherne on-the-Hill, done properly
We often work from an action list drawn up by a fire risk assessor. If you share the list, we can quote for the gaps that need fire-rated sealant. We work on door frames, pipe & cable gaps and plasterboard & masonry, and people most often call us about gaps left after a refit or conversion and unsealed gaps around fire door frames.
Commercial work in London comes with its own logistics: loading restrictions, building rules and tight access. For a building in Netherne on-the-Hill, we agree timings and access before anything starts.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Netherne on-the-Hill (CR5)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Why deal with it now?
Fire-rated sealants are less forgiving than ordinary ones. Depth, backing and surface preparation all affect how a seal performs, and we work to the product details every time. Converted houses in London often have a bathroom above someone else’s living room, 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 Netherne on-the-Hill.
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 any work starts.
Why choose Mr Mastic in Netherne on-the-Hill
- Quality sealants from Arbo and Everbuild
- We are fully insured
- Anti-fungal silicone where joints get wet
- Tidy, careful work
See what affects the cost and our reviews.
Other services in Netherne on-the-Hill
What affects the quote in Netherne on-the-Hill
The quote reflects the job in front of us. We take into account:
- The number of rooms or windows
- The product the joint needs
- Access and height
- The amount of work
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- If it’s domestic, commercial or a hotel
- The address or postcode of the job
- A few pictures by email, if you can
- The rough size of the job
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or drop us an email.
Your questions about fire rated sealant in Netherne on-the-Hill
Is parking an issue for fire rated sealant in Netherne on-the-Hill?
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 work for landlords with property near Coulsdon South station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. You can call 0345 464 0079 or email us with the details for a clear quote.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that usually means someone at home.
Where do you work from?
We are a Crawley-based firm. We work across South East England, London and Scotland.
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.
Do you certify the fire stopping?
That isn’t something we state or certify. The requirement comes from your assessor, designer or building control, and we apply a product tested for it with a record of each location.
Can you tell me which gaps need fire stopping?
No. We work from the specification you give us, and apply each product to its tested details.
Can you do several jobs on one visit?
Yes. More than one area can be quoted together.
How the visit works
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes from a few hours to a few days, depending on the number of gaps and the access. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First we work through your list or survey, measuring each gap and checking what it’s formed in.
- We remove any old or unsuitable filler and clean the gap.
- Where the tested detail needs backing or fill, we fit it.
- Fire-rated or intumescent sealant is applied to the right depth and tooled.
- Locations and products are noted so you have them on file.
How to prepare
- Try not to wet indoor joints just before the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
Ask for a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Read more
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.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Fire rated sealant in Netherne on-the-Hill: local notes
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. Many London buildings have tight access and loading restrictions, and out-of-hours working is possible to arrange.
Letting a property close to Coulsdon South station? Then new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant. Community buildings like Church of St Margaret are part of the picture too: older buildings that have had new heating or wiring often have service gaps worth checking. Netherne on-the-Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Netherne on-the-Hill is about 2 miles south of Coulsdon, in Greater London. Our applicators cover fire rated sealant for homes and businesses in Netherne on-the-Hill, as part of our work across Greater London. Our area takes in 764 places across Greater London. You can also see our page for Crawley, roughly 13 miles from Netherne on-the-Hill.
We work across CR5 for fire rated sealant. You will find streets such as The Village Square, Rookery Mead and Netherne Lane, and we cover them all. We also cover the places around Netherne on-the-Hill: Hooley (1 mile west), Merstham (2 miles south), Chaldon (2 miles south-east), South Merstham (2 miles south) and Gatton (2 miles south-west). Further out, we also cover London (14 miles north), City of Westminster (15 miles north), Kensington (15 miles north), Brompton (14 miles north), Stockwell (12 miles north) and Orpington (12 miles north-east).
Near you in Netherne on-the-Hill
Around Netherne on-the-Hill, our work takes us to homes and buildings near Shabden Park and the streets around them. Netherne on-the-Hill’s nearest station is Coulsdon South station, about 1.6 miles north. Other landmarks nearby include The Belfry (3.8 miles south) and East Surrey Museum (2.9 miles east). For a walk, there’s South London Downs National Nature Reserve and Colley Hill.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Assessing a building’s fire safety
- Fire doors that need new seals, closers or hardware
- Large holes that need a different fire-stopping system
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Pipe & cable gaps
- Flats & HMOs
- Service penetrations
- Plasterboard & masonry
- Door frames
- Linear gaps