Greater London · England
Fire Rated Sealant in Thornton Heath
Fire-stopping gaps in Thornton Heath need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Holes left by a change of layout
- Linear gaps at the head of walls
- Unsealed gaps around fire door frames
Landlord and commercial work in Thornton Heath
If you manage several properties in or around Thornton Heath, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
Fire rated sealant for homes and businesses in Thornton Heath
Ordinary silicone or decorators’ caulk in a fire-stopping gap isn’t a fire-rated seal. Anything unsuitable comes out first and the gap is resealed with a product tested for that use. We work on flats & HMOs, plasterboard & masonry and service penetrations, and people most often call us about old fire sealant that has split or come away and open holes round services passing through fire walls.
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. Where a building in Thornton Heath needs to stay open, work can be planned outside normal hours.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Thornton Heath (CR7, SW16, SE25)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Thornton Heath
Is parking an issue for fire rated sealant in Thornton Heath?
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.
Do you cover Thornton Heath for fire rated sealant?
Yes, Thornton Heath is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job.
Can I add another job to the visit?
Yes, we can. More than one area can be quoted together.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Is intumescent sealant the same as fire-rated sealant?
Intumescent means it swells when heated, helping close the gap. Intumescent sealants are one kind of fire-rated sealant; which product suits depends on the gap, the substrate and the service.
Can I use normal mastic around a pipe through a fire wall?
No. Where a fire-rated seal is needed, it has to be a product tested for that use.
Where are you based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Why it’s worth doing now in Thornton Heath
Sealant isn’t the fix for every opening. Big openings, bundles of cables and plastic pipes may need batts, collars or wraps instead. We’ll say so if a gap needs something other than sealant. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Thornton Heath, the repair is bigger than a sealant job.
Combining jobs into one visit is usually more efficient than separate visits. You will get one clear quote for the whole job.
Why choose Mr Mastic in Thornton Heath
- An ARBOMaster approved applicator
- We’re fully insured
- Rated 4.9 stars on Google
- Homes, businesses and hotels
See our cost guide or customer reviews.
Nearby places to Thornton Heath
Also in Thornton Heath
What affects the quote in Thornton Heath
We quote each job individually. These are the things that affect it:
- The amount of work
- Access and height
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
What to tell us for a quote
When you call or email, these details help:
- Any access issues, like height or stairs
- What’s wrong with the joints now
- The type of property
- The address or postcode of the job
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or drop us an email.
When to call us in Thornton Heath
Many open fire-stopping gaps are made after the building is finished. Electricians, plumbers and data installers drill through walls and ceilings and the hole they leave doesn’t always get resealed.
If you can see any of these, it’s time to have the joints looked at:
- Seals cut through by electricians, plumbers or data installers
- Gaps filled with a product that isn’t fire-rated
- Unsealed gaps around fire door frames
- Gaps where walls meet ceilings or slabs
Community buildings like Church of St Stephen are part of the picture too: gaps around pipes and cables are worth checking after any building work there.
Comparing quotes
- How the colour is chosen
- Are they insured?
- Who does the work, and how experienced they are
- Is VAT in the price?
Commercial buildings in Thornton Heath
Commercial buildings in London often have strict access rules and limited loading, and out-of-hours working is possible to arrange. 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.
As a London address, Thornton Heath can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. If you look after a building such as Winterbourne Junior Girls' School, service openings in fire-resisting walls need checking after any refurbishment.
Thornton Heath is about 7 miles south of London, in Greater London. For fire rated sealant in and around Thornton Heath, it’s easy to get a quote: please phone 0345 464 0079 or email us. We are based in Crawley and cover Greater London, Thornton Heath included. Thornton Heath is one of 764 towns and villages in Greater London where we work. For nearby work, see our London page.
Our applicators cover all of CR7, SW16 and SE25 for fire rated sealant and the streets around it. Whether your property is on Ena Road, Elm Road and Mayo Road or a nearby road, we can help. With the A23 and A212 close by, Thornton Heath is simple for us to get to for fire rated sealant. Close by, we work in Norbury (1 mile north), Pollards Hill (1 mile north), Mitcham (2 miles west), Hackbridge (2 miles west) and Eastfields (2 miles west). Further out, we also cover London (7 miles north), City of Westminster (8 miles north), Marylebone (8 miles north), Kensington (8 miles north-west), St Pancras (9 miles north) and Shoreditch (9 miles north).
Near you in Thornton Heath
Locally, jobs take us to homes and businesses close to The Archbishop Lanfranc School, Prince George pub and Grangewood Park and the streets around them. Thornton Heath has its own railway station: Thornton Heath station. Nearby you’ll also find Centrale Croydon (1.7 miles south) and Croydon University Hospital (0.7 miles south). For a walk, there’s Biggin Wood and Duppas Hill.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Ask which product was used before you paint
- Look in service cupboards and ceiling voids from time to time
- Get damaged fire seals looked at promptly
- Make resealing part of every contractor’s brief
Include fire stopping in your regular building checks. Look for cracks, gaps or sealant that has been cut or pulled out and have them put right.
When you plan work that goes through walls or ceilings, plan the fire stopping too. Doing it at the time avoids leaving gaps behind.
What we do, step by step
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. Expect the work to take anything from a few hours to several days, depending on how many gaps there are, and we explain the cure time before we leave. In Thornton Heath, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We plan the order of work and access, floor by floor or flat by flat.
- We take out any damaged or unsuitable sealant.
- Dust and loose debris are cleaned from each gap.
- The fire-rated or intumescent sealant is applied and tooled to the tested detail.
- We record what was done and flag anything that needs a different system.
Preparing for the visit
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
- Clear the area around the work
Ask for a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you are ready, ring 0345 464 0079 or send us an email.
Read more
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.