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

Fire-rated sealing and fire stopping in Knockholt Pound, Kent

Sealant work in Knockholt Pound for main contractors, managing agents and facilities managers: fire-rated and intumescent sealing of service penetrations and linear gaps, with a fixed quote first.

  • Fire-rated sealant that has cracked or shrunk back
  • Service penetrations left open after M&E works
  • Fire stopping installed outside its tested range
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
12-month guarantee on our workmanship.
Covering the South East & Scotland
Constructionline member
Fully insured: £5m PL

Fire stopping for businesses in Knockholt Pound

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

When it isn’t the sealant

Sealant solves a lot, but not everything, and we’re upfront when that’s the case. It won’t fix:

  • Plastic pipes whose detail calls for a collar or wrap
  • Approving the work on behalf of building control
  • Fire risk assessments, a job for a competent assessor

If in doubt, ring 01277 525 020 or send details through our quote form and we’ll say what we think.

Where we work in Knockholt Pound

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

About our fire stopping in Knockholt Pound

Facilities managers in Knockholt Pound often find open service penetrations when ceilings come down for other work. Where the walls and floors already have a fire-stopping specification, we can work to it using the product and detail it sets out. With no specification in place, the first step sits with your designer or fire engineer, not with us. Site teams most often ask us about unsealed joints where partitions meet the slab and improvised or mixed-product fire seals, on joints between fire-resisting walls and floors, cable penetrations and linear gaps at wall heads. Whoever orders the work in Knockholt Pound, the brief is usually the same: a fixed quote, no surprises on site and a 12-month guarantee behind the result.

Rural conversions around Knockholt Pound can put new fire-resisting partitions inside older structures. Where a pipe or cable passes through a fire-resisting wall, the seal must match the tested detail: product, substrate, gap and depth.

Every job is signed off with a 12-month guarantee. It’s a plain promise: if our work fails within that year, we put it right.

The Mastic Doctor team beside their liveried vans in front of an office building
Place
Knockholt Pound (TN14)
Region
Kent
Guarantee
A 12-month guarantee
Quotes
Quoted before any work starts
Call
01277 525 020
Updated
3 November 2026

Keeping the joints sound

Your facilities or cleaning team can help the joints last. Share these points with them:

  • Agree the fire-stopping specification before services go in
  • Treat an open penetration as a priority repair
  • Arrange inspection before areas are covered up
  • Keep product data and details in the fire safety file

Keep the product data and installation details with the building’s fire safety information. Anyone resealing later needs to know which product and detail were used.

Ask every contractor who works in risers or voids to report openings they create. Small habits like this stop openings building up.

Penetration seals near Knockholt Pound

Knockholt Pound is about 16 miles from central London. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment 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.

For a hospital such as Chelsfield Park Hospital (2.9 miles north of Knockholt Pound), penetration sealing is normally phased ward by ward, with infection-control rules agreed first. In a school such as Halstead Community Primary School, fire-rated sealant goes in around service penetrations where it is specified.

Knockholt Pound is about 4 miles north-west of Sevenoaks, in Kent. Knockholt Pound sits inside our coverage, with the same fixed quotes and 12-month guarantee as everywhere else. Knockholt Pound is one of 931 places in Kent on our list for service penetrations. Sites around London have their own page, about 16 miles away.

Postcode districts covered here: TN14. If your site is on Old London Road, Bond Close and Main Road or close by, we can quote for service penetrations. Sites close to Knockholt Pound are covered too, including Knockholt (1 mile south-west), Halstead (1 mile north-east), Sepham Heath (1 mile north-east), Pratt's Bottom (2 miles north) and Badgers Mount (2 miles north-east). Further afield, our area takes in Dartford (10 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).

Local landmarks in Knockholt Pound

We work on buildings around Polhill Bank and The Three Horseshoes pub. For rail, the closest station is Knockholt station, about 2 miles north. Nearby you’ll also find Orpington Hospital (3.4 miles north) and Lullingstone Castle (4.3 miles north-east). The countryside around Knockholt Pound includes Downe Bank and Betsom's Hill.

Map of Knockholt Pound © OpenStreetMap contributors

Do you need fire stopping in Knockholt Pound?

Some service penetrations were never sealed at all. They come to light during inspections, refits or when another trade lifts a tile.

Typical triggers for a call:

  • Snag lists that include open service penetrations
  • Open linear gaps along the top of fire-resisting walls
  • Non-fire-rated filler around services
  • Hidden openings found during inspections

Tenant changes at parks like North Downs Business Park, 1.5 miles east of Knockholt Pound, bring new data and services, and openings through fire-resisting walls need the specified seal.

What to look for in a quote

  • Their public liability cover
  • Their approach to joint depth and backing
  • Will CSCS-carded applicators be on site?
  • Health and safety accreditation such as CHAS

Our contractor checklist

Knockholt Pound: questions and answers

What does the BS 476 change mean for fire-rated sealant in Knockholt Pound?

References to BS 476 classes are being removed from Approved Document B from 2 September 2029, after which BS EN 13501-2 classification is the route, subject to transitional arrangements. The designer or fire engineer sets the specification, and we install the product to the manufacturer’s tested detail.

Will you take on work at estates like North Downs Business Park, close to Knockholt Pound?

Yes, sites like North Downs Business Park are within our area, along with the rest of Knockholt Pound. A few photographs and the unit address let us price the work.

How long do sealant joints last?

There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Sealant joints are maintenance items, so inspect them regularly.

When can you be on site?

We’re in the office from 8am until 5pm, Monday to Friday. Tell us your site hours and access windows and the work will be fitted around them.

What do you charge?

It depends on the job: the volume of work, the access, the specified product and how it’s phased. Call for a quote and we’ll price it properly.

Do you cover Knockholt Pound?

Yes. Sites across Knockholt Pound are covered.

Is any job too small?

We quote for single jobs as well as large packages and programmes. Send details for a fixed quote.

When to bring in a specialist

Paperwork matters too. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we will confirm the paperwork you need with the quote.

The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are where general trades tend to cut corners.

How the quote is worked out

Your fixed quote is built from the real scope. It allows for:

  • Induction, permit and paperwork requirements
  • Distance, for remote addresses
  • Working within restricted access windows
  • Removal of failed or old sealant

The product called for affects the cost, and so does the preparation, from cutting out to priming and backing rod. Access, phasing and site rules also count.

What to include in your enquiry

Good information means a firmer quote. Helpful details to send:

  • The product your specification calls for
  • The asbestos register, for older buildings
  • Rough lengths or quantities, or drawings if you have them
  • Any dates the work must fit around

Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to ring 01277 525 020 or email us with what you know.

How a job runs

We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. With the paperwork done, we take the joints in the sequence agreed with you. Rural sites near Knockholt Pound may need directions, gate codes or a contact on site. Add it to your enquiry and we will build it into the plan.

  1. First we confirm the product and tested details named in the specification.
  2. Openings are measured and grouped by detail.
  3. Improvised fillers and failed sealant are removed.
  4. Where the detail needs backing, it goes in at the stated depth.
  5. Fire-rated or intumescent sealant goes in around the services and is tooled off.
  6. Completed areas are checked with you, with the records agreed when we quoted.

Preparing the site

  • Explain the parking and delivery arrangements
  • Tell us which areas need to stay in use
  • Share your working hours and any access restrictions

Get a fixed quote

Photos, drawings or a schedule of the joints and a fixed quote comes back to you. If the job needs a look first, we’ll arrange a site visit.

Get a price

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