Fire-rated sealing and fire stopping in Eltham, Greater London
Sealant work in Eltham for main contractors, managing agents and facilities managers: fire-rated and intumescent sealing of service penetrations and linear gaps, quoted at a fixed price.
- Head-of-wall gaps with no fire seal
- Fire sealant pulled out of the opening
- Unsealed penetrations discovered above suspended ceilings
Fire stopping for Eltham sites
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Compartments and services around Eltham
Every new tenant in a London building tends to bring new cabling, and with it new holes through compartment walls. We install fire-rated sealant where it is specified and work within the building manager’s permit system. The area within 2 miles of Eltham holds a number of hotels. A hotel refit often runs new services through compartment walls between bedrooms and corridors, and each opening needs the specified seal.
Hotels such as The Eltham Hotel, 0.6 miles to the north of Eltham, rely on fire-resisting walls between bedrooms and corridors, and refits that add services leave penetrations to seal where fire-rated sealant is specified. For an estates team at a campus like University of Greenwich - Avery Hill, 0.9 miles to the east of Eltham, summer M&E works are usually followed by a round of penetration sealing.
Eltham is about 7 miles west of Dartford, in Greater London. We cover Eltham and the rest of Greater London, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. 764 places across Greater London fall within our area, including Eltham. For work in that direction, see our London page.
Anyone looking for fire stopping in SE9, SE12, DA15 and BR7 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. Among the streets we cover are Eltham High Street, Tarnwood Park and Elmslie Court, and sites on any of them can send details for a fixed quote. Being close to the A20 and B263, Eltham is easy to get to with materials and equipment. Just outside Eltham, we also work in Middle Park (1 mile west), New Eltham (1 mile south-east), Well Hall (1 mile north), Coldharbour (1 mile south) and Avery Hill (1 mile north-east). Bigger towns within reach include London (8 miles north-west), City of Westminster (10 miles north-west), Marylebone (10 miles north-west), Kensington (12 miles west), St Pancras (9 miles north-west) and Shoreditch (8 miles north-west).
Local landmarks in Eltham
We work on buildings around Horn Park, Eltham Church of England Primary School and The Greyhound Public House. Eltham has its own railway station: Mottingham station. A little further out are Eltham Community Hospital (under half a mile north) and Metropolitan Police Museum (2.1 miles east). For a walk, there’s The Tarn and Summer Hill.
How we handle fire stopping in Eltham
Every service that crosses a compartment wall or floor leaves an opening, and that opening needs sealing to hold back fire and smoke. 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. Site teams most often ask us about penetration schedules that need working through and improvised or mixed-product fire seals, across linear gaps at wall heads, small duct penetrations where the tested detail allows and joints between fire-resisting walls and floors. A single leaking joint is often how a building in Eltham first comes to us: we look at the rest while we are there and tell you what we find.
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.
Work we carry out in Greater London comes with a 12-month guarantee. Should something we installed fail, phone 01277 525 020 or send photos by email and we will come back to it.
- Where
- Eltham (SE9, SE12, DA15, BR7)
- Wider area
- Greater London
- Guarantee
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Should maintenance staff do it?
What you see is the finished bead, but most of the work is hidden. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.
For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class, which is what makes a joint last.
Our process
We begin with a short walk round with whoever looks after the building, agreeing which joints are in scope, where to start and what must stay open. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- We ask for the product and detail your designer has specified.
- We sort the openings by the detail each one needs.
- Old or wrong materials are cut out.
- Mineral wool or other backing is fitted where required.
- We gun the sealant in to the specified depth around each service and tool it.
- We walk the completed areas with you and confirm the records agreed at quote stage.
Before we start on site
- Arrange parking or a loading space
- Move anything stored against the joints
- Warn occupants and staff about the work
Quotes
Send us photos, drawings or a joint schedule and a fixed quote comes back to you. If the job needs a look first, we’ll arrange a site visit.
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Common problems we fix in Eltham
When a seal departs from its tested detail, the evidence no longer covers it. Gaps beyond the tested size, shallow sealant, no backing where it was needed, or products from different systems mixed together are what we find most often.
What tends to prompt an enquiry:
- Unsealed openings around new pipes and cables
- Unsealed penetrations discovered above suspended ceilings
- Improvised or mixed-product fire seals
- Damaged fire seals in risers and voids
On a site such as Green Lane Business Park (0.7 miles south-east of Eltham), every fit-out that runs new services through a compartment wall leaves penetrations to seal with the specified product.
Comparing quotes
- How long is the guarantee, and what does it include?
- How they handle RAMS and site documents
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
- How the existing material will be dealt with
Leave it or put it right?
It is cheaper to seal service penetrations as each services package finishes than to come back for them later. While the area is still open, every opening is easy to see and reach, and the right detail can be checked at the time. Getting scaffold, permits or access booked in Eltham takes effort, so it makes sense to deal with every failing joint while access is in place.
The work involved drives the cost: stripping out, preparation, sealing, access and phasing. Call for a fixed quote and we will explain how it’s made up.
Why choose Mastic Doctor in Eltham
- Fully insured
- 12 months’ guarantee on every job
- CSCS-carded applicators
- Failed material removed, not covered up
Commercial clients in Eltham
Planned maintenance programmes are welcome: working through a building or an estate in stages that fit your budget. Eltham can form part of a wider programme across Greater London.
CHAS accredited and a Constructionline member, we are straightforward to vet for your supplier list. Our insurance certificate can be sent along with the quote.
Different surfaces, different methods
Small ducts
We seal around ducts only within what the tested detail covers. The ductwork, its supports and any dampers are for the ductwork contractor.
Risers and ceiling voids
Openings above suspended ceilings are easy to miss. We follow your schedule area by area and tell you about openings outside the list.
Places near Eltham
What else we do in Eltham
Eltham: questions and answers
Do you take on work at healthcare sites like Eltham Community Hospital?
Yes. Healthcare sites are among the places we work. Work is phased so departments keep running, under the site’s own rules.
Can you work around term dates at a campus such as University of Greenwich - Avery Hill?
Yes. Tell us the term dates, vacation periods and access windows, and we will plan the work around them. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.
Is BS 476 being phased out?
It mainly affects England, where Approved Document B is dropping its BS 476 references from 2 September 2029. Classification to BS EN 13501-2 becomes the expected evidence, though transitional rules apply. In Scotland, the Technical Handbook sets its own guidance.
Do you take on multi-site work?
Yes. We take on portfolio and planned maintenance work, with each site phased to suit its occupants.
Will you sign off the seals for us?
No. Approval sits with the designer, principal designer or building control. We’ll confirm the products and details used.
Do you design or specify fire stopping?
No, that isn’t our role. Once you have a specification, we can price and install the sealant elements of it and point out anything needing another product.
Do you have third-party installer accreditation for fire stopping?
No, and we won’t imply otherwise. Third-party schemes aren’t a legal requirement, but many clients and main contractors ask for them. If it doesn’t require one, we can install the specified fire-rated sealant to its tested detail.