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

Fire-rated sealing and fire stopping in Charlton, Greater London

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

  • Builders’ foam or ordinary silicone in compartment walls
  • Hidden openings found during inspections
  • Old intumescent sealant that has split away
1
Send details
Drawings, photos, a joint schedule or a site visit.
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
Our workmanship is guaranteed for 12 months.
London, the South East & Scotland
Constructionline member
Fully insured: £5m PL

Fire stopping across Charlton

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

Fire stopping in Charlton

A lot of fire-stopping work comes after M&E installation, a refit or a tenant fit-out. Each new cable, pipe or data route cut through a fire-resisting wall leaves an opening behind, often unnoticed. Those on your schedule are closed with the specified product. If you have unsealed joints where partitions meet the slab and expanding foam used as fire stopping, we can help, on cable penetrations, pipe penetrations and small duct penetrations where the tested detail allows alike. Whether you call it commercial sealant work, mastic application or joint sealing, in Charlton it comes down to the same thing: failed joints cut out, faces prepared and the right sealant laid to the right depth.

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’ll confirm with the quote.

We sign every job off with a 12-month guarantee. It’s a plain promise: if the work we did fails within twelve months, we return to fix it.

Place
Charlton (SE7, SE18)
Wider area
Greater London
Cover
12 months on every job
Price
Fixed quote, scope in writing
Call
01277 525 020
Updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

Charlton: questions and answers

Do you take on work at healthcare sites like Queen Elizabeth Hospital?

Yes. Healthcare sites are among the places we work. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.

Is Stone Lake Retail Park, near Charlton, within your area?

Yes. Estates, retail parks and business parks around Charlton, Stone Lake Retail Park among them, are all within reach. To start, just call the office on 01277 525 020 or email drawings and photos with the unit, the joints involved and your access times.

How long before the joints can be used?

That comes down to the sealant and the temperature. Some take light use quickly, others need longer to cure, and we confirm it before leaving site.

Can you tell us what fire stopping our building needs?

No, that isn’t our role. With the designer’s details in hand, we can price the sealant elements and point out anything needing another product.

Do you work to architects’ specifications?

Yes. Include it with the drawings when you ask for a quote, and the quote will be based on it, flagging anything that needs clarifying.

How do we ask for a quote?

It works in 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 will the new sealant last?

There isn’t a single answer, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular inspection is the best way to catch problems early.

Site staff or a sealant specialist?

Using site staff can make sense for a small touch-up, but larger jobs are different: a specialist brings efficiency, a consistent finish and a 12-month guarantee.

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.

Diagnose, treat, sign off

Before we leave any area, we remove the tape, clean down and inspect every joint. If an area should be left alone while the sealant cures, we say how long and put signs out. All of Greater London is in the ULEZ, and kerbside space in Charlton can be scarce. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.

  1. First we go through the drawings, schedule or specification for the seals and raise any questions before we price.
  2. On site, each opening is checked against the tested detail it is meant to follow.
  3. Anything that doesn’t belong in the opening, such as expanding foam or general-purpose filler, is removed.
  4. Mineral wool or other backing goes in wherever the detail asks.
  5. We apply the specified sealant to the depth and around the services as the detail shows.
  6. Openings that need a collar, wrap, batt or other product are flagged to you rather than filled with sealant.

Before we start on site

  • Explain the parking and delivery arrangements
  • Tell us which areas need to stay in use
  • Warn occupants and staff about the work

Get a fixed quote

Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price against exactly what is specified. Smaller jobs need nothing more than photos and a few notes.

Get a quick quote

Related advice

How the job changes by surface

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 and we work within those limits.

Small ducts

Some fire-rated sealant details cover small ducts. Bigger ducts and fire-resisting ductwork are normally handled with other products.

Building owners, agents and FMs in Charlton

Facilities managers want contractors who arrive with the paperwork sorted. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we’ll confirm with the quote.

We work for building owners and managing agents on sealant work across single buildings or whole portfolios around Charlton. Several sites can go on one quote, which keeps the paperwork simple.

What we’re called out for in Charlton

Mixing products or improvising a detail breaks the link with the test evidence. An oversized gap, too shallow a bead, missing backing or two makers’ products combined are what we find most often.

Clients usually get in touch after noticing one or more of the following:

  • Unsealed joints where partitions meet the slab
  • Builders’ foam or ordinary silicone in compartment walls
  • Penetration schedules that need working through
  • Hidden openings found during inspections

At a university such as Ravensbourne University London, 1.7 miles north-west of Charlton, labs, lecture blocks and residences are re-serviced often, so penetration seals are best checked after M&E work.

Before you book anyone

  • Do they follow the manufacturer’s priming guidance?
  • The terms of the workmanship guarantee
  • What site paperwork they can supply
  • The named product and why it was chosen

How to choose a sealant contractor

Compartments and services around Charlton

Charlton has plenty of hotels close by, all within 2 miles. Bedroom-to-corridor walls in hotels are normally fire-resisting, so new cabling or pipework through them has to be sealed to the tested detail. London’s office and residential buildings are refitted constantly, and each round of cabling or pipework can leave open penetrations. Where fire-rated sealant is specified, we install it to the tested detail under the building’s permit-to-work arrangements.

At a healthcare site like Queen Elizabeth Hospital, 0.8 miles south-east of Charlton, new services through compartment walls are a constant, and each needs the specified seal. For a hotel such as London City Airport Hotel (1.1 miles north-east of Charlton), penetration seals are worth checking after any refit or services upgrade.

Charlton is about 2 miles west of Plumstead, in Greater London. We send applicators to Charlton for service penetrations. Charlton is one of 764 places we cover in Greater London for service penetrations. Our London page has more on work in that area (6 miles or so).

If you need fire stopping in SE7 and SE18, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. We cover commercial and managed buildings on Floyd Road, Guild Road and Priolo Road and the roads nearby. If your building is just outside Charlton, we cover New Charlton (1 mile north-west), Westcombe Park (1 mile west), Woolwich (1 mile east), Vanbrugh Park Estate (1 mile south-west) and Kidbrooke (2 miles south). Bigger towns within reach include London (6 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (7 miles west) and Shoreditch (6 miles north-west).

Near you in Charlton

We work on buildings around Charlton Park, Wildwood Montessori School and Royal Greenwich Trust School. Charlton has its own railway station: Charlton station. Other landmarks nearby include British Hospital for Mothers and Babies (0.5 miles east) and Gallions Reach Shopping Park (2.3 miles north-east). Green spaces nearby include Gilbert's Pit.

Map of Charlton © OpenStreetMap contributors

Why deal with it now?

Sealing behind the M&E trades area by area beats a sweep at the end. Openings are visible, access is open and nothing has to be taken down. Failed sealant in a building in Charlton can quickly affect neighbours, tenants or the floor below. Dealing with it early is simpler for everyone.

Larger quantities, tricky access or phasing all shape the price. Site requirements like inductions and permits play a part as well.

Why us?

  • CSCS-carded applicators
  • CHAS accredited
  • Workmanship guaranteed for 12 months
  • Failed material removed, not covered up

Take a look at how commercial sealant jobs are priced or our accreditations.

Accreditations

Trusted. Accredited. Insured.