Fire Stopping in Southfleet
We carry out fire-rated and intumescent sealing of service penetrations and linear gaps in Southfleet and the surrounding area. Send details for a fixed quote.
- Open linear gaps along the top of fire-resisting walls
- Penetration schedules that need working through
- Hidden openings found during inspections
Fire stopping for businesses in Southfleet
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Fire stopping for commercial buildings in Southfleet
A lot of fire-stopping work comes after M&E installation, a refit or a tenant fit-out. New cable runs, replaced pipework and extra data routes all punch holes in compartment walls, and they are easy to forget. Those on your schedule are closed with the specified product. If you have non-fire-rated filler around services and open linear gaps along the top of fire-resisting walls, we can put it right, whatever the surface. Most enquiries from Southfleet start with one failed joint and grow into a wider look at the building: we look at the rest while we’re there and tell you what we find.
A job near Southfleet is normally planned around one visit, so send the specification and photos first. Design and sign-off belong to the designer or building control; we install what’s specified.
We stand behind the joints we seal with a 12-month guarantee. That covers our preparation and application.
- Place
- Southfleet (DA13)
- Region
- Kent
- Cover
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
Building owners, agents and FMs in Southfleet
We take on planned maintenance as well as one-off repairs: working through a building or an estate in stages that fit your budget. Southfleet can form part of a wider programme.
We work for building owners and managing agents on everything from one building to a spread of sites around Southfleet. Several sites can go on one quote, so there’s one set of paperwork to deal with.
Diagnose, treat, sign off
On arrival, we sign in, go through any site induction and check how permits are handled. Everything around the joints gets protected before any cutting starts, and the work usually takes anything from one day to a planned run of visits, depending on the number of seals and the access. Rural sites near Southfleet may need directions, gate codes or a contact on site. Send that with the details and we will confirm the plan with the quote.
- First we confirm the product and tested details named in the specification.
- We sort the openings by the detail each one needs.
- Old or wrong materials are cut out.
- Where the detail needs backing, it goes in at the stated depth.
- We gun the sealant in to the specified depth around each service and tool it.
- We walk the completed areas with you and confirm the records agreed at quote stage.
What we need from you
- Tell us what induction or permit system the site runs
- Point out parking and an unloading spot
- Have the specification and drawings to hand
Quotes
Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to speak to us on 01277 525 020 or send details through our quote form with what you know.
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FAQs: Southfleet
Do you take on work at healthcare sites like Gravesham Community Hospital?
Yes, provided the work is planned with the site’s estates team. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
Is a smaller place like Southfleet outside your area?
Not at all. Southfleet is within our area. Our area covers London and the South East counties. Good photos up front let us bring everything on the first visit.
Do you have third-party installer accreditation for fire stopping?
No, and we won’t imply otherwise. Third-party schemes aren’t a legal requirement, but many clients and main contractors ask for them, so check your contract first. If it doesn’t require one, we can install the specified fire-rated sealant to its tested detail.
Can you tell us what fire stopping our building needs?
No, that isn’t our role. With the designer’s details in hand, we can price the sealant elements and point out anything needing another product.
Do the same rules apply to fire stopping in Scotland?
Scotland sets its own building regulations, with Technical Handbooks, while England relies on Approved Document B. Either way, we install the specified sealant to its tested detail.
Can you seal any opening with fire-rated sealant?
No. Each fire-rated sealant is tested for particular services, gap sizes and substrates. If an opening falls outside, it needs another solution.
Will you sign off the seals for us?
No. Approval sits with the designer, principal designer or building control. We will confirm the product and detail installed and agree any further records when we quote.
Common problems we fix in Southfleet
Most open service penetrations are left by later work. A new cable pulled by an electrician, a pipe rerouted by a plumber or a data run drilled through a riser can leave the hole behind. Over a few years of fit-outs, a wall can collect a lot of these.
Common reasons buildings call us in:
- Damaged fire seals in risers and voids
- Builders’ foam or ordinary silicone in compartment walls
- Unsealed penetrations discovered above suspended ceilings
- Service penetrations left open after M&E works
For a unit at a centre such as Imperial Retail Park, which lies north-east of Southfleet, penetration seals are worth checking after each shop fit.
What your quote should include
- The terms of the workmanship guarantee
- Whether primer will be used where the manufacturer specifies it
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
- Who will actually carry out the work
What sealant work can’t fix
Not every problem is a sealant problem, and we’re upfront when that’s the case. It won’t fix:
- Approving the work on behalf of building control
- Large openings beyond what any sealant detail covers
- Writing the fire-stopping specification
If in doubt, ring 01277 525 020 or use the quote form and we’ll say what we think before you book.
Joints and surfaces we work on
- Service gaps in risers
- Linear gaps at wall heads
- Cable penetrations
- Joints between fire-resisting walls and floors
- Small duct penetrations where the tested detail allows
- Pipe penetrations
What happens if it’s left?
The longer openings stay, the more there tend to be: every new cable or pipe adds another. A schedule that is dealt with regularly stays manageable. Halls, stores and units around places like Southfleet may not be checked every day, so a failed joint can leak for a while before anyone sees it. Renewing joints in good time avoids the problem.
Small jobs and large programmes are priced from the same things: scope, access, product and programme. Call for a quote, and you will have a fixed figure to work with.
Why choose Mastic Doctor in Southfleet
- Over 20 years of commercial sealing
- Fully insured
- 12 months’ guarantee on every job
- CHAS accredited
What sets the cost
To price the job, we consider:
- Whether the work must be split into stages
- Which sealant the job calls for
- The site’s rules and procedures
- Location, for remote and island sites
A quote for service penetrations depends on how many there are, their condition and the access, plus any specification you are working to. Ask us for a fixed quote.
Sending details for a quote
A few photographs plus some basic facts will normally do. It helps to include:
- A wide shot and a close-up of the area
- Where the site is, with the postcode
- How the joints are reached, and at what height
- Whether an asbestos survey exists
We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To start the process, speak to us on 01277 525 020 or email the details over.
Where services cross fire walls in Southfleet
At about 19 miles from central London, Southfleet is within reach of the capital. Offices around the capital are refitted often, and the cabling that follows can breach fire-resisting walls; the gaps need the specified seal. In England, Approved Document B covers fire stopping of openings and penetrations. References to the older BS 476 classes are being removed from it from 2 September 2029, after which the European classification, BS EN 13501-2, is the route, subject to transitional arrangements. We install whatever has been specified, to the product’s tested detail.
On a site such as Fawkham Business Park, 1.7 miles to the south-west of Southfleet, every fit-out that runs new services through a compartment wall leaves penetrations to seal with the specified product. Halls and meeting rooms at places like Church of St Nicholas sometimes gain new services, and any compartment wall crossed needs the specified seal.
Southfleet is about 2 miles south-west of Northfleet, in Kent. Businesses, contractors and managing agents in Southfleet use us for work on service penetrations. We work across 931 places in Kent, large and small. For work in that direction, see our London page, about 19 miles away.
We take on service penetrations across the DA13 postcode area, whatever the building. We cover commercial and managed buildings on Red Street, Gloxinia Road and Brakefield Road and the roads nearby. Just outside Southfleet, we also work in Hook Green (1 mile south-west), Northfleet Green (1 mile east), Betsham (1 mile north-west), Painters Ash (1 mile north-east) and Springhead (1 mile north). Further afield, our area takes in Maidstone (13 miles south-east), Dartford (5 miles north-west), Sevenoaks (11 miles south-west), Gravesend (3 miles north-east), Tonbridge (15 miles south) and Swanley (7 miles west).
Landmarks near Southfleet
Around Southfleet, our work takes us to commercial buildings near Northfleet School for Girls, Black Lion pub and Longfield Chalk Bank. Southfleet’s nearest station is Longfield station, about 1.5 miles south-west of the centre. A little further out are Gravesham Community Hospital (2.7 miles north-east) and Bluewater (2.9 miles north-west). For a walk, there’s Sawyers Lake.