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

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

Work needed on a service penetration in Bexley? We assess it, carry out the work and guarantee our workmanship for 12 months.

  • Non-fire-rated filler around services
  • Seals that don’t match their tested detail
  • Service penetrations left open after M&E works
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
South East, London & Scotland
CHAS & Constructionline
£5m PL insurance

Fire stopping for businesses in Bexley

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

Fire stopping in Bexley

A fire-rated sealant is only one part of a tested system: its test evidence covers one product in one kind of wall or floor, with set services, gaps, depths and backing. Before we seal anything, we check the opening against the detail it is meant to follow, and raise it with you if it falls outside. Most enquiries involve fire stopping installed outside its tested range and seals disturbed by maintenance and left open, across small duct penetrations where the tested detail allows, joints between fire-resisting walls and floors and pipe penetrations. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, in Bexley it comes down to the same thing: failed joints cut out, faces prepared and the right sealant laid to the right depth.

After a fit-out or new cabling in a London building, risers and ceiling voids are where open service gaps tend to be found. Fire-rated sealant goes in where it’s the specified item; where a collar, wrap or batt is called for instead, we flag it.

Work we carry out comes with a 12-month guarantee. If an installation problem shows up, speak to us on 01277 525 020 or send details through our quote form and we’ll arrange a return visit.

Location
Bexley (DA5, DA6, DA14, DA1)
Wider area
Greater London
Guarantee
12 months on our workmanship
Quotes
Fixed quote, scope in writing
Call
01277 525 020
Page updated
3 November 2026
The Mastic Doctor team standing beside their branded vans outside an office building

Common questions from Bexley clients

Can you cope with the access rules in a London building?

Yes, we plan every London job around the building’s own access rules. Send the building rules and access times with your enquiry. All of Greater London is inside the ULEZ, and our planning allows for it

Do you work in occupied care homes around Bexley?

Yes. We agree rooms and times with the manager and work a few areas at a time. Noise and disruption are kept to a minimum.

How soon can the area be used again?

That comes down to the sealant and the temperature. Some products skin over quickly but need longer to cure fully, so we’ll confirm the curing time on the day.

Are you insured?

Yes. Our insurance certificate can be sent alongside the quote.

What about RAMS and site documents?

Requirements differ from site to site, so list what you need, whether RAMS, insurance or CSCS details, and we’ll confirm with the quote.

How do you choose the sealant?

Where there’s a specification, we use the product it names. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.

Is Bexley in your area?

Yes. We cover Bexley, and the simplest way to start is to call the office on 01277 525 020 or email us.

Site staff or a sealant specialist?

The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.

Redoing a failed joint typically costs more than getting it right at the outset, 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.

For managing agents and facilities managers

Blocks and communal areas make up much of the work for housing associations and agents. We phase the work so people keep access, with each stage agreed with your site contact.

For main contractors, we work as the sealant subcontractor. We work to your programme, your specification and your site rules, with CSCS-carded applicators on site.

Why deal with it now?

Leave a penetration open and smoke and fire can cross into the next compartment far earlier than intended. Putting it right is normally a modest job when the openings are accessible. Wait until ceilings close or areas are occupied and the same work becomes harder to reach. Access in London is hard enough to arrange once, so while access is arranged it pays to renew all failing joints, not just the worst.

Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote, and you’ll have a fixed figure to work with.

Why us?

  • Health and safety: CHAS accredited
  • Specification-led, product-correct work
  • Workmanship guaranteed for 12 months
  • Constructionline member for supplier checks

See what affects the cost or our accreditations and insurance.

How the quote is worked out

Your fixed quote is built from the real scope. It allows for:

  • Distance, for remote addresses
  • Which sealant the job calls for
  • Phasing around occupants
  • The size and state of each joint

Every site prices differently: joint size, product, access and site hours all play a part. Send the details and a fixed figure follows.

Before you send an enquiry

Diagnosis starts before we arrive. Let us know:

  • Asbestos survey details if the building is older
  • Drawings or a marked-up plan, if available
  • Photos of the joints, close up and from further back
  • The type of building and who uses it

The quickest route to a quote is a few photos and the site postcode. Send them through the quote form, or call 01277 525 020 or email drawings and photos to discuss it first.

Signs you need fire stopping in Bexley

Openings in fire-resisting walls usually appear when services are added or changed. A new cable pulled by an electrician, a pipe rerouted by a plumber or a data run drilled through a riser can leave the hole behind. Over a few years of fit-outs, a wall can collect a lot of these.

Things that typically lead to an enquiry:

  • Openings left by services added after handover
  • Penetration schedules that need working through
  • Non-fire-rated filler around services
  • Open linear gaps along the top of fire-resisting walls

For a unit at a centre such as Broadway Shopping Centre, which lies north-east of Bexley, penetration seals are worth checking after each shop fit.

What to look for in a quote

  • Their approach to joint depth and backing
  • How the joint faces will be prepared and primed
  • How they’ll work around occupants
  • How long is the guarantee, and what does it include?

Our contractor checklist

Our process

A typical day starts with protection: masking tape along the joint edges and sheeting over anything nearby. The work itself usually takes longer where risers, ceiling voids or occupied floors have to be worked through in sequence, and our waste is bagged and taken away as we go. Most London premises stay occupied while we’re on site, so zones and timings are agreed with whoever manages the building. Areas are handed back as each section is finished.

  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. Improvised fillers and failed sealant are removed.
  4. Mineral wool or other backing is fitted where required.
  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.

What we need from you

  • Arrange parking or a loading space
  • Flag any permit to work we will need
  • For older buildings, check the asbestos register before work

Quotes

Need a figure for a tender or a budget? Send the scope and any drawings, and we will return a fixed quote that you can work with. If you have questions first, ring 01277 525 020 or send details through our quote form.

Get a price

Read more

Compartments and services around Bexley

London’s office and residential buildings are refitted constantly, and each round of cabling or pipework can leave open penetrations. We install fire-rated sealant where it is specified and work within the building manager’s permit system. In England, Approved Document B covers fire stopping of openings and penetrations. From 2 September 2029, BS 476 references are being taken out of Approved Document B, leaving BS EN 13501-2 classification as the route, subject to the Government’s transitional arrangements. We install whatever has been specified, to the product’s tested detail.

Hospital estates such as Queen Mary's Hospital (2.2 miles south-west of Bexley) are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail. At a university such as University of Greenwich Avery Hill Campus, which lies west of Bexley, labs, lecture blocks and residences are re-serviced often, so penetration seals are best checked after M&E work.

Bexley is about 3 miles east of Eltham, in Greater London. If you’re looking for fire stopping in Bexley, we can help. 764 places across Greater London fall within our area, including Bexley. There’s a separate page for London, about 11 miles away.

We take on service penetrations across the DA5, DA6, DA14 and DA1 postcode area, for business premises of every kind. For a building on Bexley High Street, Camden Road and The North Glade or nearby, send details and we’ll quote for service penetrations. Access to Bexley is via the A2018 and B2210. Nearby places we also cover include Blendon (1 mile north-west), North Cray (1 mile south), Bexleyheath (1 mile north), Upton (1 mile north) and Coldblow (1 mile east). Bigger towns within reach include London (11 miles west), City of Westminster (13 miles west), Marylebone (13 miles north-west), Kensington (15 miles west), St Pancras (12 miles north-west) and Shoreditch (11 miles north-west).

Landmarks near Bexley

Recent enquiries here include premises near St Columba's Catholic Boys' School, Danson Park and Townley Grammar School, among other places. Bexley’s nearest station is Bexley station, roughly 0.6 miles east of the centre. Other landmarks nearby include Broadway Shopping Centre (1 mile north-east) and Bexley Museum (1.1 miles east). Green spaces nearby include Summer Hill and Wansunt Pit.

Map of Bexley © OpenStreetMap contributors
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