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

Fire stopping in Fortune Green

Need fire stopping in Fortune Green? It’s simple: send details, get a quote, we seal, guaranteed.

  • Penetration schedules that need working through
  • Unsealed penetrations discovered above suspended ceilings
  • Fire sealant pulled out of the opening
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
Covering the South East & Scotland
CHAS & Constructionline
£5m PL insurance

Fire stopping in Fortune Green

Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.

Fire stopping in Fortune Green, done properly

Where pipes, cables and other services cross a compartment wall or floor, the opening around them has to be closed so fire and smoke can’t move between compartments. Our part is installing fire-rated and intumescent sealant at those openings and along linear gaps, where the specification calls for it. We work to the product’s tested detail for every seal rather than guesswork. If you have improvised or mixed-product fire seals and old intumescent sealant that has split away, we can put it right, on small duct penetrations where the tested detail allows, linear gaps at wall heads and joints between fire-resisting walls and floors alike. A specialist sealant contractor works differently from a general builder: in Fortune Green, that means joint design, primers and backing rod as standard.

Taller residential buildings in London may fall under the Building Safety Act’s higher-risk regime, where fire-stopping records get close attention. Our part is installing the specified fire-rated sealant; tell us what records you need and we will confirm with the quote.

Every job we finish is backed by a 12-month workmanship guarantee, wherever the site is. If a joint we sealed fails because of how it was installed, we come back and put it right.

Mastic Doctor team members lined up next to their branded vans outside an office building
Location
Fortune Green (NW3, NW6, NW2)
Region
Greater London
Cover
12 months on every job
Quote
Quoted before any work starts
Call
01277 525 020
Last updated
3 November 2026

When something else is needed

We check first that sealant really is the fix. It won’t put right:

  • Designing or specifying fire stopping, which sits with the designer or fire engineer
  • Reviewing a building’s overall fire safety
  • Approving the work on behalf of building control

If in doubt, phone 01277 525 020 or email us and we will say what we think.

Joints and surfaces we work on

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

What the job involves on each surface

Risers and ceiling voids

Risers and ceiling voids hold most of a building’s service penetrations. Access to these areas is planned with you in advance along with any permits your site needs.

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 first.

Diagnose, treat, sign off

When we get to site, we sign in, go through any site induction and check how permits are handled. Everything around the joints gets protected before any cutting starts, and the work typically takes a single visit for a short list of penetrations, or a phased programme for a whole building. In Fortune Green, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.

  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. Where the detail needs backing, it goes in at the stated depth.
  5. We gun the sealant in to the specified depth around each service and tool it.
  6. We walk the completed areas with you and confirm the records agreed at quote stage.

Before we start on site

  • Make sure the joints can be reached
  • Share your working hours and any access restrictions
  • Let building users know which areas are affected

Request a quote

We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To ask for one, speak to us on 01277 525 020 or send photos by email.

Get a quick quote

Related advice

Fortune Green: questions and answers

Can work in a care setting near Fortune Green go ahead while residents are there?

Yes. We work around residents’ routines, a room or two at a time. We follow the home’s own procedures throughout.

What happens to BS 476 references for fire stopping in Fortune Green?

From 2 September 2029, Approved Document B drops its BS 476 references in favour of BS EN 13501-2 classification, with transitional arrangements. The designer or fire engineer sets the specification, and we install the product to the manufacturer’s tested detail.

Do you work to architects’ specifications?

Yes. We follow the specification, along with the manufacturer’s installation guidance.

Will you quote for a small job?

Whatever the size, the process is the same: details, then a fixed price, then sealing, then a 12-month guarantee.

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.

Can weather delay the job?

For external joints, yes. The joint has to be dry and within the product’s temperature range, so frost, rain or cold mornings can delay outside work. Inside work is seldom held up.

What do you charge?

Each job is quoted on its own details. For yours, phone 01277 525 020 or email the details over with a description of the work.

After the work

Once the work is signed off, these steps help:

  • Agree the fire-stopping specification before services go in
  • Check with the data sheet before painting over fire sealant
  • Get seals inspected before ceilings and boxing close
  • Put resealing into every M&E and fit-out package

After the work, brief anyone else working in the area that the openings are now sealed. Any seal cut back for a new service needs reinstating to its tested detail, by someone who knows the system.

Regular walk-rounds of service areas are worth the time. A cracked or disturbed seal found early is a small job; found late, it can be one of many.

Leave it or put it right?

Inspections and handover checks often pick up fire stopping. Late discoveries can delay handover while openings are reopened and resealed, so earlier action pays back. Failed sealant in a building in Fortune Green can quickly affect neighbours, tenants or the floor below. Putting it right early is less disruptive than dealing with the consequences.

Pricing service penetrations depends on quantities, condition and access, and any specification that applies. Call for a quote.

Why appoint us

  • Fully insured
  • CHAS accredited contractor
  • CSCS-carded applicators
  • Sealing commercial buildings since 2005

Read our cost guide or our accreditations and insurance.

Where services cross fire walls in Fortune Green

Every new tenant in a London building tends to bring new cabling, and with it new holes through compartment walls. Where fire-rated sealant is specified, we install it to the tested detail under the building’s permit-to-work arrangements. There are four care or nursing homes within about 2 miles of Fortune Green. Care homes rely on fire-resisting walls and floors, and maintenance work that breaks through them leaves openings to seal. Where that’s fire-rated sealant, we install it to the manufacturer’s tested detail.

For an estates team at a campus like Regent's University London, 2.7 miles to the south-east of Fortune Green, summer M&E works are usually followed by a round of penetration sealing. On a site such as The Quadrant Business Centre, 1.2 miles to the south-west of Fortune Green, every fit-out that runs new services through a compartment wall leaves penetrations to seal with the specified product. For a unit at a centre such as O2 Centre, which lies south-east of Fortune Green, penetration seals are worth checking after each shop fit.

Fortune Green is about 1 mile west of Hampstead, in Greater London. If you’re looking for fire stopping in Fortune Green, we can help, as we do across Greater London. We work across 764 places in Greater London, from busy centres to rural villages. For work in that direction, see our London page, about 6 miles away.

Commercial sites across NW3, NW6 and NW2 are covered for service penetrations. Among the streets we cover are Mill Lane, Ajax Road and Sarre Road, and sites on any of them can send details for a fixed quote. Close to Fortune Green, our area also takes in West Hampstead (1 mile east), Childs Hill (1 mile north), Hampstead (1 mile east), Greenhill (1 mile east) and Vale of Health (1 mile north-east). Further afield, our area takes in London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles east).

Landmarks near Fortune Green

Around Fortune Green, our work takes us to commercial buildings near Holly Bush pub, St Vedasts School For Boys and Kilburn Grange Park, among other places. For rail, the closest station is West Hampstead Thameslink station, roughly 0.5 miles south of the centre. Nearby you will also find Montfichet's Tower (4.9 miles south-east) and O2 Centre (0.8 miles south-east). Not far away are The Long Water and Westbere Copse.

Map of Fortune Green © OpenStreetMap contributors

Doing it in-house

Putting right a botched joint often costs more than sealing it well at the start, because the whole bead must be removed and the faces cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.

Site maintenance staff can often handle a short internal joint. Where it goes wrong is preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.

Accreditations

Trusted. Accredited. Insured.