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

Fire stopping in Longfield Hill

Fire-rated and intumescent sealing of service penetrations and linear gaps throughout Longfield Hill and nearby, by CSCS-carded applicators. Fully insured and CHAS accredited.

  • Head-of-wall gaps with no fire seal
  • Seals that don’t match their tested detail
  • Fire-rated sealant that has cracked or shrunk back
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
South East, London & Scotland
CHAS & Constructionline
Fully insured: £5m PL

Fire stopping for Longfield Hill sites

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

What the job involves on each surface

Small ducts

Ducts are only sealed with sealant where the detail allows it. Dampers and ductwork systems themselves are outside our work.

Masonry and concrete

Core-drilled holes are neat; broken-out ones rarely are. Each gap is measured where it is widest against the detail’s limits, and any outside it are raised with you.

About our fire stopping in Longfield Hill

We should be clear about what we do and don’t do. Deciding the specification sits with the designer, the fire engineer and building control. What we bring is careful installation of the specified sealant, to the maker’s guidance in Longfield Hill and nearby. The enquiries we see most involve unsealed openings around new pipes and cables and unsealed joints where partitions meet the slab, on joints between fire-resisting walls and floors, small duct penetrations where the tested detail allows and cable penetrations. Searching for sealant specialists in Longfield Hill? We’ve been sealing commercial buildings since 2005, with CSCS-carded applicators.

Around smaller places like Longfield Hill, 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.

We stand behind the joints we seal with a 12-month guarantee. That covers our preparation and application, and if something we did falls short, we return to it.

Where
Longfield Hill (DA3)
Region
Kent
Cover
12 months on our workmanship
Quote
A fixed quote before we start
Call
01277 525 020
Last updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

What affects the price in Longfield Hill

There’s no standard rate for sealant work, because every site is different. What we look at:

  • How much existing material needs removing
  • Distance, for remote addresses
  • The product specified
  • Whether the work must be split into stages

Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote and we’ll put a fixed figure on it.

Before you send an enquiry

However big the job, these details speed things up:

  • When you need the work done
  • Clear photographs of the problem areas
  • Whether an asbestos survey exists
  • Access details, including height

Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to ring 01277 525 020 or email drawings and photos with what you know.

Compartments and services around Longfield Hill

Fire stopping of openings and penetrations in England falls under Approved Document B. Its BS 476 references are being withdrawn from 2 September 2029, with BS EN 13501-2 classification taking over, subject to transitional arrangements. Our part stays the same: the specified product, installed to its tested detail. Longfield Hill is about 20 miles from central London. Office refits around the commuter belt bring new cabling through fire-resisting walls.

Residences at universities like University of Greenwich, 4.6 miles north-west of Longfield Hill, have compartment walls that must be resealed whenever services change. In a school such as Istead Rise Primary School, fire-rated sealant goes in around service penetrations where it is specified.

Longfield Hill is about 3 miles south of Northfleet, in Kent. We send applicators to Longfield Hill for service penetrations. Our Kent coverage takes in 931 places, large and small. For work in that direction, see our London page.

We take on service penetrations across the DA3 postcode area, for business premises of every kind. Streets here include Main Road, Nurstead Lane and Ryecroft. Close to Longfield Hill, our area also takes in New Barn (1 mile north-west), Hartley (1 mile west), Nash Street (1 mile north-east), Meopham (1 mile south-east) and Longfield (1 mile north-west). Bigger towns within reach include Maidstone (12 miles south-east), Dartford (6 miles north-west), Sevenoaks (10 miles south-west), Gravesend (4 miles north-east), Tonbridge (13 miles south) and Northfleet (3 miles north).

Around Longfield Hill

We work on buildings around Rectory Meadow and Longfield Academy and the streets around them. The closest station to Longfield Hill is Meopham station, roughly 1 mile east of the centre. A little further out are Stone Castle (4.5 miles north-west) and Gravesham Community Hospital (4 miles north). The countryside around Longfield Hill includes Sawyers Lake.

Map of Longfield Hill © OpenStreetMap contributors

Longfield Hill: questions and answers

What does the BS 476 change mean for fire-rated sealant in Longfield Hill?

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.

Can you work around term dates at a campus such as University of Greenwich?

Yes, holiday working periods are the norm on campus jobs. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.

What do you charge?

That depends on the job: the volume of work, the access, the specified product and how it’s phased. Call for a fixed quote.

Do you hold CHAS accreditation?

Yes. We are CHAS accredited, we are a Constructionline member and we use CSCS-carded applicators.

Will your applicators have CSCS cards?

Yes. We use CSCS-carded applicators, which many sites require.

Can one quote cover more than one building?

Yes. A group of buildings can go on one quote, and you deal with one contact throughout.

What’s the quickest route to a quote?

There are four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. The first step only needs photos and a postcode.

Common problems we fix in Longfield Hill

On a busy project, programme pressure can mean fire stopping is rushed or left to whichever trade is closest. That is how unsuitable products and improvised details end up in compartment walls and later need putting right.

What tends to prompt an enquiry:

  • Snag lists that include open service penetrations
  • Fire sealant pulled out of the opening
  • Unsealed openings around new pipes and cables
  • Fire stopping installed outside its tested range

Halls and meeting rooms at places like Church of St Mildred sometimes gain new services, and any compartment wall crossed needs the specified seal.

Before you book anyone

  • How they’ll work around occupants
  • Whether their applicators hold CSCS cards
  • Proof of insurance
  • How the joint faces will be prepared and primed

Questions to ask before you appoint anyone

From enquiry to sign-off

Where the site stays busy, we agree a sequence with your contact so the disruption stays in one area at once. Each section is protected, cleaned back and sealed, then handed back before we move to the next. For work around Longfield Hill, we aim to finish in one visit, so we ask for photos and rough sizes first. Then the right materials arrive with us.

  1. First we confirm the product and tested details named in the specification.
  2. We sort the openings by the detail each one needs.
  3. Old or wrong materials are cut out.
  4. Mineral wool or other backing is fitted where required.
  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

  • Agree which areas must stay open
  • For older buildings, check the asbestos register before work
  • Send any specification or drawings in advance

Quotes

We quote a fixed sum against the scope you give us, so the cost is agreed before work starts. To ask for one, speak to us on 01277 525 020 or email a schedule or drawings.

Get a price

Related advice

Work for main contractors and building owners

Hospitality, education, healthcare, office and retail clients book us directly too. The work is planned around how the building runs, so guests, pupils, patients or staff are disturbed as little as possible.

FMs need a contractor who is easy to get on site. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we will confirm them with the quote.

Should maintenance staff do it?

Site maintenance staff can often handle a short internal joint. The usual problems come from preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.

Putting right a botched joint often costs more than sealing it well at the start, since all of it has to come out and the faces be cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.

Accreditations

Trusted. Accredited. Insured.