Kent · England
Fire Rated Sealant in Knockholt
Fire rated sealant for Knockholt and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Door frames with gaps between frame and wall
- Damaged fire sealant left by other trades
- Old fire sealant that has split or come away
What we cannot put right
We’ll always be straight with you, so here’s what sealant can’t fix:
- Deciding what fire stopping a building needs
- Big openings where sealant alone is not the tested solution
- Doors that aren’t fire doors in the first place
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Surfaces we seal
- Flats & HMOs
- Linear gaps
- Service penetrations
- Pipe & cable gaps
- Plasterboard & masonry
- Door frames
Fire rated sealant for homes and businesses in Knockholt
Fire stopping only performs as intended if it’s done to the detail: the right depth, the right backing and the right product for the substrate. That is the part we focus on, gap by gap. We’re often asked to deal with ordinary sealant used where a fire-rated product was needed and joints picked up in a fire-stopping survey, across plasterboard & masonry, pipe & cable gaps and linear gaps.
If you have holiday lets, a converted barn used for business or a community building near Knockholt, washroom and kitchen sealant and any fire-rated joints need the same attention as anywhere.
Your job is guaranteed for a year, as with all our work.
- Place
- Knockholt (TN14)
- Wider area
- Kent
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Other services in Knockholt
What the job involves on each surface
Door frames
We deal with the gap around the frame, not the door. The door leaf, its seals and closer need a door specialist, and we will say if we spot a problem with them.
Linear gaps
A linear joint may need to allow for movement as well as fire. We choose a product and depth that suit the gap and the movement, following the tested detail.
Quotes for fire rated sealant in Knockholt
Jobs vary more than people expect. What affects the quote:
- The product the joint needs
- The amount of work
- How easy the joints are to reach
- The old material and how stubborn it is
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, phone 0345 464 0079 or email us for an honest opinion and a quote.
Helping us quote
When you contact us, these details help:
- What’s wrong with the joints now
- The type of property
- If someone has resealed it before
- Pictures of the joints, sent by email
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or send us an email.
Knockholt questions
Do you cover smaller places like Knockholt?
Yes, Knockholt is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
I let a flat near Knockholt station. Can you help?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
How much does fire rated sealant cost in Knockholt?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we will talk you through it.
Do you take out the old sealant first?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Will we have a record of what was sealed?
Yes. You get a list of where we worked and what we used.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Is intumescent sealant the same as fire-rated sealant?
Intumescent describes a material that swells in heat. Intumescent sealants are a type of fire-rated sealant and which one is used depends on the job.
Why act early in Knockholt
Fire-rated sealants are less forgiving than ordinary ones. How it’s installed changes how it performs, so we follow the maker’s details on every gap. In a small place like Knockholt, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
Why book with us
- Rated 4.9 stars on Google
- 12-month guarantee on every job
- Full insurance on every job
- Homes, businesses and hotels
See what affects the cost and customer reviews.
How it works
Good joint work is mostly preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it generally takes from a few hours to a few days, depending on the number of gaps and the access. For a village or hamlet like Knockholt, 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.
- Before starting, we go through the specification or action list with you.
- Each gap is measured and its substrate and service noted.
- Unsuitable material such as ordinary foam or silicone is cut out.
- We fit backing where needed and apply the fire-rated sealant to depth.
- Every location is recorded with the product used for your records.
Getting ready for the visit
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
- Keep children and pets away from the work area
How to get a quote
Getting a quote is simple: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we will come back to you with a quote.
Advice
Fire rated sealant around Knockholt
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, 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.
If you let a flat or house near Knockholt station, fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through.
Knockholt is about 4 miles north-west of Sevenoaks, in Kent. Across the TN14 area, we cover fire rated sealant for homes and businesses. Across Kent, we cover 922 places, Knockholt among them. You can also see our page for London, roughly 16 miles from Knockholt.
Jobs for fire rated sealant in TN14 is quoted and booked the same way as anywhere else. Fire rated sealant is available to properties on Main Road and Blueberry Lane. We also cover Knockholt Pound (1 mile north-east), Halstead (2 miles north-east), Sepham Heath (2 miles north-east), Pratt's Bottom (2 miles north) and Twitton (3 miles east). We also work in nearby towns such as Dartford (11 miles north-east), Sevenoaks (4 miles south-east), Royal Tunbridge Wells (14 miles south-east), Gravesend (14 miles north-east), Tonbridge (11 miles south-east) and Northfleet (13 miles north-east).
Landmarks near Knockholt
Typical jobs here are in homes near The Three Horseshoes pub and the streets around them. The closest station to Knockholt is Knockholt station, roughly 2.7 miles north-east. Other landmarks nearby include Orpington Hospital (3.6 miles north) and Otford Heritage Centre (3.9 miles east). Green spaces nearby include Betsom's Hill and Downe Bank.
Signs you need fire rated sealant in Knockholt
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.
People generally contact us after spotting one of these:
- Gaps where walls meet ceilings or slabs
- Gaps flagged on a fire risk assessment
- Damaged fire sealant left by other trades
- Holes left by a change of layout
Community buildings like St Katharine's Church are part of the picture too: gaps around pipes and cables are worth checking after any building work there.
Before you book anyone
- What preparation is included
- Whether they seal over old material or remove it
- Whether the sealant suits the joint
- Whether you can choose the colour
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Allow for resealing whenever new services are run
- Check risers, ceiling voids and cupboards during building checks
- Keep general-purpose foam and caulk away from fire-stopping gaps
- Tell trades working in the building that fire seals must be put back
Any fire seal that’s cut or drilled needs resealing to its tested detail. If you need new services through a sealed wall, plan the fire stopping as part of the job.
When you plan work that goes through walls or ceilings, plan the fire stopping too. Doing it at the time avoids leaving gaps behind.