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

Grubb Street fire stopping

Fire stopping in Grubb Street, backed by over 20 years in commercial sealing. Fully insured and CHAS accredited.

  • Penetration schedules that need working through
  • Fire stopping installed outside its tested range
  • Unsealed penetrations discovered above suspended ceilings
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
12-month guarantee on our workmanship.
South East, London & Scotland
Constructionline member
£5m PL insurance

Fire stopping near Grubb Street

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

What we can’t put right

A proper diagnosis includes knowing what sealant can’t do. We’ll tell you if the real problem is one of these:

  • Construction that lacks the fire resistance the seal relies on
  • Reviewing a building’s overall fire safety
  • Plastic pipes whose detail calls for a collar or wrap

If you are not sure, just give us a call on 01277 525 020 or send photos by email and we’ll give you a straight answer before you book.

Where we work in Grubb Street

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

How we handle fire stopping in Grubb Street

Opened ceilings and riser doors often reveal service openings nobody sealed. Where the walls and floors already have a fire-stopping specification, we can work to it, matching the product and detail it names. Where there isn’t one, the designer or fire engineer needs to set one first. If you have fire sealant pulled out of the opening and penetration schedules that need working through, we can help, on small duct penetrations where the tested detail allows, cable penetrations and joints between fire-resisting walls and floors alike. Most enquiries from Grubb Street start with one failed joint and grow into a wider look at the building: we look at the rest while we are there and tell you what we find.

Rural conversions around Grubb Street can put new fire-resisting partitions inside older structures. A penetration seal only performs as tested if product, substrate, service, gap and depth all match the detail.

The 12-month guarantee is for workmanship rather than wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we spell out the cover before we begin.

Location
Grubb Street (DA2)
Region
Kent
Cover
A 12-month guarantee
Quote
A fixed quote before we start
Call
01277 525 020
Page updated
3 November 2026
The Mastic Doctor team standing beside their branded vans outside an office building

Different surfaces, different methods

Risers and ceiling voids

Voids hide a lot of unsealed openings. We work through the areas on your schedule methodically, and note anything we find that isn’t on it.

Cables and cable bundles

Cable penetrations are frequently sealed with fire-rated sealant where the detail allows. The detail limits bundle size and the gaps between and around cables.

After the work

After handover, these steps help:

  • Don’t let anyone top up a fire seal with the wrong product
  • Look above ceilings when tiles are lifted for other jobs
  • Keep product data and details in the fire safety file
  • Flag new cables with no seal around them

New services after handover are a common way fire stopping gets breached. A short check at the end of each job saves a long hunt later.

On fit-outs, get the fire-stopping specification agreed before the services go in. Details can then be picked to suit the actual pipes, cables and ducts, and installation follows the programme.

What sets the cost

Your fixed quote is built from the real scope. It takes account of:

  • Joint width, depth and condition
  • Access and working height
  • Distance, for remote addresses
  • Whether the work must be split into stages

There’s no price list, since every building and every scope is different. For a fixed figure, call for a quote and we will price your job on its own details.

Sending details for a quote

We can often quote from photos and a few details. Please tell us:

  • Whether the building will be occupied during the work
  • The postcode of the building
  • The product your specification calls for
  • Whether an asbestos survey exists

A good quote starts with a clear picture: what’s there, how much of it, how we reach it and what’s specified. Send what you have, and we’ll arrange a site visit if anything is unclear.

How a job runs

Where the site stays busy, we agree a sequence with your contact so the disruption stays in one area at once. Each area is protected, prepared and sealed, then reopened once the sealant allows before the next one starts. Jobs in and around smaller places like Grubb Street are normally planned as a single visit, so photographs and measurements up front really help. That way the right products come on the day.

  1. We ask for the product and detail your designer has specified.
  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. Completed areas are checked with you, with the records agreed when we quoted.

Before we start on site

  • Arrange parking or a loading space
  • Make sure the joints can be reached
  • Tell staff and tenants when we will be in

Get a fixed quote

Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To start the process, speak to us on 01277 525 020 or email us.

Ask for a quote

Related advice

Grubb Street: questions and answers

Will you plan work around the academic year at somewhere like University of Greenwich?

Yes, holiday working periods are the norm on campus jobs. Let us know which documents your site asks for, and we’ll confirm them alongside the quote.

Does your area include sites such as Fawkham Business Park, near Grubb Street?

Yes. We cover Grubb Street and the area around it, including industrial estates, business parks and retail parks such as Fawkham Business Park. Photos and a short description are enough for a first look.

How many days will you need on site?

It depends on the scope, though a typical visit typically takes a single visit for a short list of penetrations, or a phased programme for a whole building. For bigger or phased jobs, we’ll set out a timescale with the quote.

What if there’s asbestos in the old mastic?

Managing asbestos is the dutyholder’s responsibility, so for older buildings we ask for the asbestos register first. Work pauses if suspect material is found, until it has been tested.

How do I request a quote?

There are four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. Step one needs little more than photos and a postcode.

How long before the joints can be used?

The product and site conditions decide that. Some products skin over quickly but need longer to cure fully, and we confirm it before leaving site.

Do the same rules apply to fire stopping in Scotland?

Our work covers Greater London, the South East and every Scottish council area. Scotland’s non-domestic Technical Handbook, clause 2.1.14, expects service penetrations to be fire stopped to at least the wall or floor’s fire resistance, using products tested for their end use.

Why deal with it now?

It is cheaper to seal service penetrations as each services package finishes than to come back for them later. Openings are visible, access is open and nothing has to be taken down. One visit to deal with every failing joint makes more sense than several trips to a place like Grubb Street, rather than one at a time. Photos of every joint help us quote for the whole job.

Access can matter as much as the joints themselves: joints within easy reach take less time than ones that need access equipment. Tell us how the joints are reached and call for a quote.

Why us?

  • Failed material removed, not covered up
  • Clear, fixed quotes
  • Fully insured, including public liability cover
  • Work carried out by CSCS-carded applicators

Read what affects the cost and how we’re accredited.

Compartments and services around Grubb Street

Central London is about 17 miles from Grubb Street. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls. 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.

In a school such as Greenlands Primary School, fire-rated sealant goes in around service penetrations where it is specified. Wherever services are added at a hospital such as Darent Valley Hospital (to the north-west of Grubb Street) the compartment line has to be made good with the specified product. For a building such as Church of Saint Mary Magdalene, new heating or data runs are the usual reason penetrations need sealing.

Grubb Street is about 3 miles south-west of Northfleet, in Kent. Looking for fire stopping in Grubb Street? We can help, as we do across Kent. Our Kent coverage takes in 931 places, large and small. London is covered too, some 17 miles away.

Anyone looking for fire stopping in DA2 gets the same process as the rest of our area: details, then a fixed price, then sealing and a 12-month guarantee. Close to Grubb Street, our area also takes in Green Street Green (1 mile north), Westwood (1 mile north-east), St Margarets (1 mile west), South Darenth (1 mile west) and Bean (1 mile north). Bigger towns within reach include Maidstone (14 miles south-east), Dartford (4 miles north-west), Sevenoaks (10 miles south-west), Gravesend (5 miles north-east), Tonbridge (14 miles south) and Northfleet (3 miles north-east).

What’s near Grubb Street

In Grubb Street, that means premises near Longfield Chalk Bank, Railway Tavern and Longfield Academy and the streets around them. The closest station to Grubb Street is Longfield station, about 1 mile south-east. A little further out are Stone Castle (2.6 miles north) and Darent Valley Hospital (2.3 miles north-west). The countryside around Grubb Street includes Sawyers Lake.

Map of Grubb Street © OpenStreetMap contributors
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