The Mastic Doctor team standing beside their branded vans outside an office building
Kent · England

Hearnden Green fire stopping

Planning work on a service penetration in Hearnden Green? We look at it, seal it with the right product and hand it over with a 12-month guarantee.

  • Openings left by services added after handover
  • Fire-stopping items raised at inspection or handover
  • Improvised or mixed-product fire seals
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
South East, London & Scotland
CHAS accredited
£5m public liability

Fire stopping for Hearnden Green sites

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

Fire stopping in Hearnden Green

For main contractors, our fire stopping package slots in after the M&E trades have finished in an area. We work from your penetration schedule or marked-up drawings alongside the manufacturer’s details. Tell us what records you need and we will confirm with the quote. If you are dealing with fire seals cut back for extra cables and never reinstated and non-fire-rated filler around services, we can help. A specialist sealant contractor works differently from a general builder: in Hearnden Green, that means joint design, primers and backing rod as standard.

Around smaller places like Hearnden Green, penetration seals come up in schools, halls, pubs with rooms, care homes and farm buildings used as offices. Any service penetration through those walls should be closed with the specified product, set out as its test evidence shows.

Work we carry out in Kent comes with a 12-month guarantee. Should something we installed fail, speak to us on 01277 525 020 or email us and we’ll come back to it.

Location
Hearnden Green (TN27)
Region
Kent
Guarantee
A 12-month guarantee
Quotes
Quoted before any work starts
Call
01277 525 020
Updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Our process

Occupied buildings need a little choreography. We sign and contain the area we are in, keep walkways clear and work section by section so the rest of the building stays in use. Rural sites near Hearnden Green may need directions, gate codes or a contact on site. Send that with the details and we will confirm the plan with the quote.

  1. First we go through the drawings, schedule or specification for the seals.
  2. On site, each opening is checked against the tested detail it is meant to follow.
  3. Unsuitable fillers and loose debris are taken out of each opening.
  4. We fit the backing the detail asks for, to the stated depth.
  5. Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
  6. If an opening needs something other than sealant, we tell you instead of improvising.

What we need from you

  • Move anything stored against the joints
  • Arrange parking or a loading space
  • For older buildings, check the asbestos register before work

Quotes

Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to call the office on 01277 525 020 or send details through our quote form with what you know.

Get a price

Read more

Different surfaces, different methods

Masonry and concrete

Block walls and concrete floors are common substrates for penetration seals. Dust and loose debris are cleared out of the opening.

Drylining partitions

Plasterboard partitions are tested as a specific construction. The sealant detail has to be tested in that wall type, with the stated board layers before sealing.

Why act early in Hearnden Green

Inspections and handover checks often pick up fire stopping. Finding unsealed or improvised openings late can hold up a programme, so earlier action pays back. Converted and older buildings near places like Hearnden Green tend to move, and aged sealant cracks. A sealant with the right movement capability, correctly sized, lasts far better.

The price depends on the quantity of joints, how much old material needs removing and the access. Call for a fixed quote when you’re ready.

What you get with us

  • Workmanship guaranteed for 12 months
  • Fully insured, including public liability cover
  • A Constructionline member, so easy to vet
  • Work to your specification and the manufacturer’s guidance

Take a look at our cost guide or how we’re accredited.

When something else is needed

Before quoting, we check that sealant is the right answer. It isn’t the answer for:

  • Signing off or certifying a building’s fire stopping
  • Reviewing a building’s overall fire safety
  • Deciding what a wall or floor needs, which belongs to the designer

Not sure which it is? You can ring 01277 525 020 or email a schedule or drawings and we’ll tell you honestly before you book.

Surfaces we seal

  • Service gaps in risers
  • Cable penetrations
  • Small duct penetrations where the tested detail allows
  • Joints between fire-resisting walls and floors
  • Pipe penetrations
  • Linear gaps at wall heads

Compartments and services around Hearnden Green

Approved Document B is the English guidance that covers fire stopping around 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. Either way, we install the specified product to its tested detail. Central London is about 37 miles from Hearnden Green. Tenant changes on commuter-belt business parks mean regular fit-outs, and new services through compartment walls; the gaps need the specified seal.

For buildings in and around Hearnden Green, fire-rated sealant is installed where it is specified, to the manufacturer’s tested detail.

Hearnden Green is about 6 miles south-east of Maidstone, in Kent. We cover commercial sites throughout Hearnden Green. Across Kent, 931 places are covered, Hearnden Green among them. Sites around London have their own page, about 37 miles away.

Commercial sites across TN27 are covered for service penetrations. Just outside Hearnden Green, we also work in Headcorn (1 mile south-east), Southernden (2 miles east), Swift's Green (3 miles south-east), Smarden Bell (3 miles south-east) and Lashenden (4 miles south). Further afield, our area takes in Maidstone (6 miles north-west), Ashford (12 miles east), Sittingbourne (12 miles north-east), Royal Tunbridge Wells (15 miles west), Tonbridge (15 miles west) and Faversham (15 miles north-east).

What’s near Hearnden Green

The closest station to Hearnden Green is Headcorn station, roughly 1.8 miles south. Nearby you will also find Sutton Valence Castle (1.7 miles north-west) and Kent Firefighting Museum (3.6 miles south).

Map of Hearnden Green © OpenStreetMap contributors

Questions we are asked in Hearnden Green

Is Hearnden Green too far out for you?

Not at all: smaller places are covered as well as towns. Our area covers London and the South East counties. Where we can, we group nearby jobs to make the most of each trip.

How does the removal of BS 476 from Approved Document B affect fire-rated sealing in Hearnden Green?

From 2 September 2029, Approved Document B drops its BS 476 references in favour of BS EN 13501-2 classification, with transitional arrangements. Our part doesn’t change: the specified product, to its tested detail.

Do you seal on top of existing sealant?

No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.

Do you guarantee your work?

Yes, for 12 months. If our installation fails in that time, we return and fix it.

Can you work while the building is occupied?

In most cases, yes. We phase the work so most of the building stays in use, with each area protected and signed.

When can the area be used after sealing?

The product and site conditions decide that. Some take light use quickly, others need longer to cure, and we confirm it before leaving site.

Are you CHAS accredited?

Yes. We are CHAS accredited and a Constructionline member.

Keeping the joints sound

Regular inspection catches problems early. In particular:

  • Put resealing into every M&E and fit-out package
  • Include service cupboards in routine inspections
  • Keep product data and details in the fire safety file
  • Ask the designer to confirm details early on refits

Keep the product data and installation details with the building’s fire safety information. It makes later repairs much easier to match.

Write fire stopping into the scope of any work crossing a compartment wall or floor. That way the opening is sealed while the trade and access are still there, not months later.

What we are called out for in Hearnden Green

Some service penetrations were never sealed at all. Inspections, refurbishments and ceiling access usually bring them to light.

What tends to prompt an enquiry:

  • Hidden openings found during inspections
  • Fire sealant pulled out of the opening
  • Open linear gaps along the top of fire-resisting walls
  • Non-fire-rated filler around services

For a unit at a site such as Barradale Farm Industrial Estate, which lies south of Hearnden Green, new power or data runs between office and warehouse can breach a compartment wall.

What your quote should include

  • How they’ll work around occupants
  • What site paperwork they can supply
  • Will failed sealant be removed rather than covered?
  • Health and safety accreditation such as CHAS

Choosing a commercial sealant contractor

Accreditations

Trusted. Accredited. Insured.