Kent · England
Southfleet Fire Rated Sealant
Intumescent and fire-rated sealant around gaps, frames and service penetrations for householders, landlords and businesses in Southfleet. Fully insured, ARBOMaster approved and guaranteed for a year.
- Holes left by a change of layout
- Unsealed gaps where pipes and cables go through a wall
- Linear gaps at the head of walls
What we do, step by step
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours for a handful of gaps, and longer for a whole building. For a village or hamlet like Southfleet, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Access to each area is agreed so the work can run in order.
- Old, damaged or unsuitable sealant is removed.
- 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.
How to prepare
- Tell us if parking is tricky
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
How to get a quote
Want a quote for fire rated sealant? Please phone 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear quote before we start.
Advice
About our fire rated sealant in Southfleet
A fire seal relies on being installed the way it was tested: correct depth, correct backing and a product suited to the surfaces. That’s the part we focus on. If you have gaps where walls meet ceilings or slabs and fire stopping disturbed by later work, we can put it right, on door frames, plasterboard & masonry and service penetrations alike.
For a small place like Southfleet, the journey and timings are agreed in advance, so the job can fit around bookings, guests or opening times where possible.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Where
- Southfleet (DA13)
- Wider area
- Kent
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the quote in Southfleet
Your quote is based on your job. We look at:
- Working hours on commercial sites
- Whether the work is at height
- The number and length of the joints
- The type of sealant required
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it has been sealed before
- How many joints, rooms or windows are involved
- Where the job is, and your postcode
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To get started, call 0345 464 0079 or send us an email.
Fire rated sealant in Southfleet: local notes
In England, the Regulatory Reform (Fire Safety) Order 2005 requires a fire risk assessment for workplaces and for the common parts of blocks of flats, 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.
Rented homes near Longfield station change hands often, and new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant. If you look after a church, hall or community building such as Church of St Nicholas, service openings in its walls need the right fire-rated sealant, as in any building. For site and facilities teams at buildings such as Sedley's Church of England Voluntary Aided Primary School, gaps opened by contractors for new cabling are a common finding in schools and offices.
Southfleet is about 2 miles south-west of Northfleet, in Kent. We carry out fire rated sealant for homes and businesses in Southfleet, as part of our work across Kent. Our Kent coverage runs to 922 places, Southfleet among them. London is on our list too, around 19 miles away.
Our applicators cover all of the DA13 postcode area for fire rated sealant. Streets in the area include Red Street, Gloxinia Road and Brakefield Road, and we cover them all. We also cover 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). We also work in nearby towns such as 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 homes and buildings near Northfleet School for Girls, Black Lion pub and Longfield Chalk Bank. For rail, the closest station is Longfield station, roughly 1.5 miles south-west of the centre. Other landmarks nearby include Gravesham Community Hospital (2.7 miles north-east) and Bluewater (2.9 miles north-west). Green spaces nearby include Sawyers Lake.
Your questions about fire rated sealant in Southfleet
Will you come out to Southfleet?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Longfield station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. You can ring 0345 464 0079 or email us with the details for a clear quote.
Can you seal over the old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Do you provide details of the products used?
Yes. Locations and products are written up when we finish. Tell us if your assessor needs it in a particular format.
Where is Mr Mastic based?
Our base is Crawley. Our area covers South East England, London and Scotland.
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. Out-of-hours work can be arranged if that suits the building.
Can you fill the gap behind a fire door frame?
Yes, where the gap suits a sealant detail. Our work is the gap around the frame and we’ll tell you if we spot problems with the door.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Aftercare tips
A little care helps the new joints last. We recommend:
- File the fire-stopping record where your assessor can find it
- Check whether a sealant can be painted before decorating over it
- Look in service cupboards and ceiling voids from time to time
- Never patch a fire seal with standard sealant
Include fire stopping in your regular building checks. Watch for cracking, gaps or seals that have been disturbed and get them seen to.
If a fire risk assessment has flagged a gap, do not leave it for the next one. Have it sealed, then keep the record so you can show it was dealt with.
DIY sealant or a professional job?
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.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Towns and villages near Southfleet
Other services in Southfleet
Different surfaces, different methods
Flats and HMOs
Conversions generally leave a mix of old and new service holes. The gaps on your list are sealed with a fire-rated product and record where they are.
Plasterboard walls
In plasterboard walls, the condition of the board edge matters. Crumbling edges are cleaned back before the sealant goes in.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Construction that doesn’t provide fire resistance on its own
- Fire risk assessments, which need a qualified assessor
- Sign-off of the building, which sits with building control or your assessor
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before booking.
What we seal
- Door frames
- Flats & HMOs
- Linear gaps
- Pipe & cable gaps
- Service penetrations
- Plasterboard & masonry
Leave it or put it right?
A quick fill with any sealant to hand isn’t fire stopping. Fire-rated products are tested in set gap sizes, depths and substrates, so both the product and the method matter. In a small place like Southfleet, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Why choose Mr Mastic in Southfleet
- Rated 4.9 stars on Google
- Fully insured
- Old sealant always removed completely
- Approved under the ARBOMaster scheme