Fire-rated sealing and fire stopping in Blackfen, Greater London
Our CSCS-carded applicators take on fire-rated and intumescent sealing of service penetrations and linear gaps in Blackfen. Send details for a fixed quote.
- Builders’ foam or ordinary silicone in compartment walls
- Service penetrations left open after M&E works
- Old intumescent sealant that has split away
Fire stopping in Blackfen
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Building owners, agents and FMs in Blackfen
Hotels, schools, healthcare sites, offices and retail units come to us directly as well. The work is planned around how the building runs, so the building keeps working while we do.
If you look after buildings for someone else, you need clear quotes and clear reporting. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative, plus a 12-month guarantee.
Fire stopping in Blackfen
It helps to set out our role at the start. The designer, fire engineer or building control decides which fire stopping is required; sign-off sits with them too. What we bring is careful installation of the specified sealant, to the maker’s guidance. If you are dealing with openings found when ceilings come down for a refit and head-of-wall gaps with no fire seal, we can help, whatever the surface. One point of contact handles commercial sealant work in Blackfen from the first photographs to the final walk-round, whether it’s one building or several.
Fit-outs and M&E works in London buildings often leave service penetrations open behind ceilings and in risers. Fire-rated sealant goes in where it’s the specified item; where a collar, wrap or batt is called for instead, we flag it.
A 12-month guarantee applies to all our work. Should something we installed fail, ring 01277 525 020 or email a schedule or drawings and we’ll come back to it.
- Place
- Blackfen (DA15, DA16, SE9)
- Wider area
- Greater London
- Cover
- 12 months on our workmanship
- Price
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
On site: what to expect
Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Joint faces are cleaned back to sound, dry surfaces, the manufacturer’s primer is applied where it’s called for, and each bead is tooled to a neat concave finish. All of Greater London is in the ULEZ, and kerbside space in Blackfen can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.
- First we confirm the product and tested details named in the specification.
- Openings are measured and grouped by detail.
- Old or wrong materials are cut out.
- Where the detail needs backing, it goes in at the stated depth.
- Fire-rated or intumescent sealant goes in around the services and is tooled off.
- Completed areas are checked with you, with the records agreed when we quoted.
Getting the site ready
- Share your working hours and any access restrictions
- Agree which areas must stay open
- Tell staff and tenants when we’ll be in
Quotes
Let us know the site, the scope and your timescale, and we’ll put a fixed quote together. The easiest way is to speak to us on 01277 525 020 or use the quote form.
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Common questions from Blackfen clients
Could you schedule work at a campus like University of Greenwich Avery Hill Campus for the vacation?
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.
Can you cope with the access rules in a London building?
Yes. Inductions, permits and timed loading are routine for us in London. Share the building’s contractor rules and we will work to them.
How do you deal with asbestos in old sealant?
The duty to manage asbestos sits with the building’s dutyholder, so for older buildings we ask for the asbestos register first. Work pauses if suspect material is found, until it has been tested.
How many days will you need on site?
The duration is planned around your programme and the access we’re given. We’ll give you an estimate of time on site when we quote.
Will you write the fire-stopping specification?
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.
Can you send site paperwork?
Each site asks for different documents, so tell us what you need and we’ll confirm it when we quote.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Nearby places to Blackfen
Also in Blackfen
How the quote is worked out
To price the job, we consider:
- Quantities, in metres or numbers
- Any access equipment needed
- How much existing material needs removing
- The size and state of each joint
We don’t publish prices, since every building and every scope is different. For a fixed figure, call for a quote and we’ll price your job on its own details.
What we need to price the job
It doesn’t need to be a full survey. A few details are enough to get going:
- Where the site is, with the postcode
- The product your specification calls for
- Access details, including height
- Rough lengths or quantities, or drawings if you have them
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, ring 01277 525 020 or email drawings and photos.
Service penetrations in Blackfen buildings
In London buildings, frequent fit-outs and M&E changes are a common reason fire stopping gets breached. Where fire-rated sealant is specified, we install it to the tested detail under the building’s permit-to-work arrangements. There are seven care or nursing homes within about 2 miles of Blackfen. Where new services have gone through compartment walls in a care setting, the gaps need the specified product. Where that’s fire-rated sealant, we install it to the manufacturer’s tested detail.
On a hospital site such as Eltham Community Hospital, 1.7 miles west of Blackfen, fire-rated sealant goes in where the specification calls for it, with the work planned around the estates team’s permits. Workshops and IT rooms at colleges like Rose Bruford College, 1.1 miles south-east of Blackfen, are re-serviced often, leaving penetrations to seal.
Blackfen is about 2 miles east of Eltham, in Greater London. Across the DA15 postcode area, the process is the same: details in, fixed quote out, then sealing and a 12-month guarantee. We work across 764 places in Greater London, from busy centres to rural villages. There’s a separate page for London, roughly 9 miles from Blackfen.
Commercial sites across DA15, DA16 and SE9 are covered. Streets here include Days Lane, Gordon Road and Kent Avenue. Close to Blackfen, our area also takes in Falconwood (1 mile north), Avery Hill (1 mile west), East Wickham (1 mile north), New Eltham (1 mile south-west) and Longlands (1 mile south). A short drive away, we cover London (9 miles north-west), City of Westminster (11 miles north-west), Marylebone (11 miles north-west), Kensington (13 miles west), St Pancras (10 miles north-west) and Shoreditch (9 miles north-west).
Near you in Blackfen
Recent enquiries here include premises near The George Staples pub, Harris Academy Falconwood and Shoulder of Mutton Green, among other places. For rail, the closest station is Falconwood station, roughly 0.8 miles north-west of the centre. Nearby you’ll also find Broadway Shopping Centre (2.3 miles east) and Eltham Community Hospital (1.7 miles west). For a walk, there’s Summer Hill and The Tarn.
Do you need fire stopping in Blackfen?
Head-of-wall joints and wall-to-wall junctions are frequent weak points. Deflection and building movement can open these gaps, and the wrong product can split as a result. The tested detail for a linear joint states the width and movement it covers.
Most enquiries start with something like this:
- Unsealed penetrations discovered above suspended ceilings
- Openings left by services added after handover
- Snag lists that include open service penetrations
- Seals that don’t match their tested detail
In a retail centre such as Broadway Shopping Centre (2.3 miles east of Blackfen), any fire-resisting wall between units that is crossed by new services needs sealing to the tested detail.
What your quote should include
- Is the sealant right for the movement and the substrate?
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
- What level of public liability insurance do they hold?
- Will failed sealant be removed rather than covered?
After the work
Your facilities or cleaning team can help the joints last. Share these points with them:
- Don’t let anyone top up a fire seal with the wrong product
- Get seals inspected before ceilings and boxing close
- Check risers and ceiling voids after each round of works
- Check with the data sheet before painting over fire sealant
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.
Make reporting new openings part of every permit to work in service areas. Small habits like this stop openings building up.
When something else is needed
Some faults sit outside our scope, and we say so rather than covering them up:
- Designing or specifying fire stopping, which sits with the designer or fire engineer
- Issuing fire ratings or certificates for seals
- Openings that need collars, wraps, batts or boards rather than sealant
If you are not sure, just phone 01277 525 020 or use the quote form and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Service gaps in risers
- Cable penetrations
- Pipe penetrations
- Small duct penetrations where the tested detail allows
- Linear gaps at wall heads
- Joints between fire-resisting walls and floors