Kent · England

Fire-rated sealant in Northfleet, Kent

Intumescent and fire-rated sealant around gaps, frames and service penetrations for homes and businesses in Northfleet and across Kent. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.

  • Cracked or shrunken fire-rated sealant
  • Standard silicone or caulk in a fire-stopping gap
  • Gaps where walls meet ceilings or slabs

Fire rated sealant for Northfleet homes and businesses

About our fire rated sealant in Northfleet

Where services or frames pass through a fire-resisting wall or floor, the gap around them needs a fire-rated seal. Each gap is sealed to the product maker’s tested detail for its size and substrate, with a record of the products and locations if you need one. If you have gaps left after a refit or conversion and open holes round services passing through fire walls, we can help, whatever the surface.

Commercial jobs in a town like Northfleet range from shops and offices to schools and small business units. Each has washrooms, kitchens and service openings through walls that need the right sealant.

We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.

Place
Northfleet (DA11)
Wider area
Kent
Guarantee
12 months on all our work
Quotes
A clear quote up front
Phone
0345 464 0079
Last updated
26 October 2026
The Mr Mastic team in navy uniforms in front of three Mr Mastic vans

How we quote for fire rated sealant

There’s no set price list, because no two jobs are the same. The quote depends on:

  • How much there is to do
  • Access and height
  • When we can work, for business premises
  • Mould in or behind the old joints

Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear price for the lot.

What to tell us for a quote

A few details help us give you an accurate quote. When you ask for a quote, tell us:

  • Whether it’s a home or a business
  • The problem you’ve noticed
  • Roughly how big the job is
  • Where the property is

To get a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.

What fire rated sealant looks like in Northfleet

If you run a hotel, guest house or holiday let in a coastal place like Northfleet, heavy use in the busy months is hard on washroom and kitchen sealant, and any building work there should leave fire-rated joints made good. Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, and gaps around services are often picked up there. We apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details.

Rented homes near Gravesend station change hands often, and any gap left by new services in shared walls should be closed with a fire-rated product. Schools such as Northfleet Technology College are buildings too, and gaps opened by contractors for new cabling are a common finding in schools and offices.

Northfleet is about 5 miles east of Dartford, in Kent. For fire rated sealant in and around Northfleet, please phone 0345 464 0079 or email us for a quick quote. We cover Kent from our Crawley base. Northfleet is one of 922 places in Kent where we work for fire rated sealant. There’s also a page for London, about 20 miles away.

All of DA11 is within our area for fire rated sealant. Whether your property is on Lawrance Square, London Road and Marks Square or a nearby road, we can help. Northfleet sits on or near the A2 and A226. Nearby, we also carry out fire rated sealant in Painters Ash (1 mile south-west), Springhead (1 mile west), Windmill Hill (1 mile east), Northfleet Green (1 mile south) and Gravesend (1 mile east). Larger places within reach include Maidstone (14 miles south-east), Dartford (5 miles west), Sevenoaks (13 miles south-west), Swanley (8 miles west), Kings Hill (11 miles south) and Foley Park (13 miles south-east).

Landmarks near Northfleet

We work in homes and buildings around The Six Bells pub, Saint George's Church of England School and Copperfield Academy. The closest station to Northfleet is Gravesend station, roughly 1 mile north-east of the centre. Nearby you’ll also find Bluewater (3.3 miles west) and Stone Castle (3.1 miles west). Not far away are Chafford Gorges Nature Park and Sawyers Lake.

Map of Northfleet © OpenStreetMap contributors

How the visit works

There isn’t much for you to do on the day. Show us the job and we will take it from there. The work itself takes a few hours for a handful of gaps, and longer for a whole building, including the tidy-up. A visit in Northfleet needs access to the work and a place to park close by. For outside work, let us know about side access, gates and any upper-floor joints.

  1. We start with the survey or action list, checking the size and surfaces of every gap.
  2. Anything that isn’t fit for the job comes out, and the gap is cleaned.
  3. Backing or fill is fitted where the product’s tested detail calls for it.
  4. The sealant goes in to the depth its detail sets, then it’s tooled off.
  5. We record the locations and products used for your records.

Preparing for the visit

  • Mention any sign-in or site rules at work premises
  • Try not to wet indoor joints just before the visit
  • Let us know about parking restrictions

How to get a quote

It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or email us.

Ask for a quote

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FAQs for Northfleet

Do you cover Northfleet for fire rated sealant?

Yes, Northfleet is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or email us with a few details of the job.

I let a flat near Gravesend station. Can you help?

Yes. We work for landlords and letting agents as well as householders. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.

Are you ARBOMaster approved?

Yes. We hold ARBOMaster approved applicator status, and we’re fully insured.

Do you carry out fire risk assessments?

No, we do not assess buildings. Once you have a specification or action list from your assessor or designer, we will quote for the sealant work on it.

Will there be a smell?

Sometimes, a little. It fades as the sealant cures.

Can you fill the gap behind a fire door frame?

Yes, if the gap is within the product’s tested range. Our work is the gap around the frame and we will tell you if we spot problems with the door.

What do you put in the joint?

Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we’re using and why.

Do you take on fire stopping in schools and offices?

Yes. We regularly work in flats, HMOs, schools and offices while they’re in use, with access planned around residents or staff. Out-of-hours work can be arranged where it’s needed.

How the job changes by surface

Linear gaps

Long, narrow gaps appear where walls meet slabs and ceilings. They’re sealed with a fire-rated sealant over backing where the detail calls for it.

Plasterboard walls

Plasterboard partitions are common in flats, offices and conversions. We use a product tested in that kind of wall for each gap size.

Do you need fire rated sealant in Northfleet?

A lot of fire stopping is out of sight: in ceiling voids, service risers and behind boxing. Out of view, damage sits unnoticed until someone inspects.

Look out for these signs:

  • Standard silicone or caulk in a fire-stopping gap
  • Fire stopping disturbed by later work
  • Gaps around pipes and cables through fire-resisting walls
  • Gaps flagged on a fire risk assessment

Community buildings like Church of All Saints are part of the picture too: gaps around pipes and cables are worth checking after any building work there.

Comparing quotes

  • Who does the work, and how experienced they are
  • Are they insured?
  • What happens if the job turns out different
  • What the cure time is

Our hiring checklist

How to look after the new joints

Aftercare is simple:

  • Do not paint over fire sealant until it has cured
  • Store the list of sealed gaps with your building paperwork
  • Check risers, ceiling voids and cupboards during building checks
  • Make resealing part of every contractor’s brief

Let contractors know where fire stopping has been done, and make sure anything they disturb is resealed with a suitable product. A lot of damaged fire stopping comes from later work.

It’s easiest to seal gaps while they’re few and easy to reach. Over time, more work adds more holes.

Landlord and commercial work in Northfleet

We also work for property managers and facilities teams. Several sites can be quoted together.

A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.

When something else is needed

It helps to know what we can’t do:

  • Problems with the door itself rather than the gap around the frame
  • Walls or floors that weren’t built to resist fire
  • Openings too large for sealant, which need batts, boards or another system

Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.

Surfaces we seal

  • Service penetrations
  • Plasterboard & masonry
  • Linear gaps
  • Door frames
  • Flats & HMOs
  • Pipe & cable gaps
20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job