Fire-rated sealing and fire stopping in Stone, Kent
Fire-rated and intumescent sealing of service penetrations and linear gaps in Stone and across Kent. CHAS accredited and fully insured, with a 12-month guarantee.
- Fire seals cut back for extra cables and never reinstated
- Fire sealant pulled out of the opening
- Head-of-wall gaps with no fire seal
Fire stopping for businesses in Stone
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
When to call us in Stone
Fire stopping can get squeezed at the end of a programme, or done by whoever is on site. That is when untested combinations creep in and later need putting right.
Common reasons buildings call us in:
- Unsealed penetrations discovered above suspended ceilings
- Unsealed openings around new pipes and cables
- Fire-stopping items raised at inspection or handover
- Fire seals cut back for extra cables and never reinstated
At a healthcare site like Darent Valley Hospital, 1 mile south-west of Stone, new services through compartment walls are a constant, and each needs the specified seal.
Questions to ask before you book
- The terms of the workmanship guarantee
- Will failed sealant be removed rather than covered?
- How they’ll work around occupants
- Their approach to joint depth and backing
About our fire stopping in Stone
We are commercial sealant applicators, CHAS accredited and a Constructionline member, with CSCS-carded applicators on site. We hold no third-party fire-stopping installer certificate and we’d rather say that up front. What we offer is careful installation of the specified sealant to its tested detail, with a 12-month guarantee on our workmanship. If you have old intumescent sealant that has split away and service penetrations left open after M&E works, we can help. One point of contact handles commercial sealant work in Stone from the first photographs to the final walk-round, whether it’s one building or several.
Around Stone, penetration and linear seals tend to be one-building jobs. Send the specification, drawings or photographs of the openings and we will quote to suit.
What our 12-month guarantee covers is the way we did the job: preparation, application and finish. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.
- Location
- Stone (DA9)
- Wider area
- Kent
- Cover
- 12 months on every job
- Quote
- A fixed quote before we start
- Call
- 01277 525 020
- Last updated
- 3 November 2026
Places near Stone
More services for Stone
Our process
Site rules come first: sign-in, induction and whatever permit system the building uses. Once we are cleared to begin, we take the joints in the sequence agreed with you. Work in places the size of Stone is planned as a single visit where we can. Clear photographs and measurements help us bring the right products.
- We read the specification, drawings or penetration schedule you send and ask about anything unclear.
- Every penetration is compared with its detail: wall or floor type, service, gap size and depth.
- Unsuitable fillers and loose debris are taken out of each opening.
- Mineral wool or other backing goes in wherever the detail asks.
- We apply the specified sealant to the depth and around the services as the detail shows.
- Openings that need a collar, wrap, batt or other product are flagged to you rather than filled with sealant.
Before we start on site
- Send any specification or drawings in advance
- Tell us which areas need to stay in use
- Arrange parking or a loading space
Get a fixed quote
Need a figure for a tender or a budget? Send the scope and any drawings, and we’ll return a fixed quote you can plan around. If you have questions first, call the office on 01277 525 020 or use the quote form.
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Common questions from Stone clients
Is Stone too far out for you?
Not at all. Stone is within our area. We work across Greater London and the South East. Where we can, we group nearby jobs to make the most of each trip.
Do you take on work at healthcare sites like Darent Valley Hospital?
Yes, provided the work is planned with the site’s estates team. Each area is agreed with the ward or department and the estates team in advance.
What’s the quickest route to a quote?
You can use the quote form on this site; alternatively, give us a call on 01277 525 020 or email the details over. Photos, drawings or a joint schedule help us quote quickly.
What happens if old sealant might contain asbestos?
Asbestos is possible in some older mastics, particularly in buildings from before 2000. We check the asbestos register before cutting out old sealant in an older building, and work stops until any suspect material has been tested. We don’t remove asbestos-containing materials.
Are you fully insured?
Yes. Mastic Doctor is fully insured, public liability included.
Can the sealant be colour-matched?
That depends on the product. Some ranges are wide, others limited, so the available colours are confirmed with the quote.
Do you need to see the site first?
That depends on the size and complexity of the job. Straightforward work can often be priced from photographs and measurements, and bigger or more complex jobs normally get a visit.
When it isn’t the sealant
Sealant solves a lot, but not everything, and we’re upfront when that’s the case. It won’t fix:
- Writing the fire-stopping specification
- Signing off or certifying a building’s fire stopping
- Walls or floors that aren’t fire-resisting to begin with
Not sure which it is? You can speak to us on 01277 525 020 or send photos by email and we’ll tell you honestly before you book.
Surfaces we seal
- Linear gaps at wall heads
- Joints between fire-resisting walls and floors
- Small duct penetrations where the tested detail allows
- Service gaps in risers
- Pipe penetrations
- Cable penetrations
After the work
A few simple habits keep the new joints working:
- Look above ceilings when tiles are lifted for other jobs
- Leave fire sealant to cure fully before covering it
- Treat an open penetration as a priority repair
- Ask the designer to confirm details early on refits
Add risers, plant rooms and ceiling voids to routine fire-stopping checks. Look for cracks, unsealed new cables and gaps that have been enlarged and get them dealt with.
On fit-outs, get the fire-stopping specification agreed before the services go in. Details can then be picked to suit the actual pipes, cables and ducts, and the work runs in step with the M&E.
Different surfaces, different methods
Metal pipes
Sealant details often cover copper and steel pipework. The tested detail sets the pipe size range, gap, depth and whether insulation can stay on.
Drylining partitions
Drylined fire walls are tested in a particular build-up. The sealant detail has to be tested in that wall type, with the stated board layers before sealing.
Fire-rated sealing for Stone buildings
Central London is about 16 miles from Stone. Offices around the capital are refitted often, and the cabling that follows can breach fire-resisting walls, and the gaps need sealing with the specified product. Stone has a number of hotels close by, all within 2 miles. A hotel refit often runs new services through compartment walls between bedrooms and corridors, and each opening needs the specified seal.
In a hotel such as Campanile Hotel, which lies north-west of Stone, new pipework or cabling through bedroom and corridor walls needs sealing with the specified product. Colleges such as South Essex College (3 miles north-east of Stone) add IT and services as courses change, and each new penetration through a fire-resisting wall needs sealing with the specified product.
Stone is about 2 miles east of Dartford, in Kent. We cover commercial sites throughout Stone, for single jobs and planned programmes alike. We work across 931 places in Kent. We also cover London, some 16 miles away.
Business premises anywhere in DA9 are within our area for service penetrations. For a building on Church Road, Perkins Close and Richardson Close or nearby, we can quote for service penetrations. You’ll find Stone on or near the A296. Just outside Stone, we also work in Greenhithe (1 mile north-east), Swanscombe (1 mile east), Bean (2 miles south-east), Darenth (2 miles south) and Temple Hill (2 miles west). Bigger towns within reach include Sevenoaks (12 miles south), Gravesend (5 miles east), Northfleet (3 miles east), Swanley (5 miles south-west), Kings Hill (13 miles south-east) and Windmill Hill (4 miles east).
What’s near Stone
In Stone, that means premises near Darenth Country Park, The White Hart Public House and Stone Lodge School, among other places. The closest station to Stone is Stone Crossing station, roughly 0.5 miles north-west of the centre. Well-known places in the area include Stone Museum of Geology (1.3 miles west) and Darent Valley Hospital (1 mile south-west). Not far away are Chafford Gorges Nature Park and Sawyers Lake.
Work for main contractors and building owners
If you look after buildings for someone else, clear figures and clear communication matter. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative.
For main contractors, we work as the sealant subcontractor on new-build and refurbishment projects. Programme, specification and site rules come first.