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

Fire Stopping in Catford

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

  • Unsealed penetrations discovered above suspended ceilings
  • Non-fire-rated filler around services
  • Damaged fire seals in risers and voids
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
Covering the South East & Scotland
CHAS & Constructionline
£5m public liability

Fire stopping near Catford

Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.

Fire stopping for commercial buildings in Catford

For main contractors, our fire stopping package slots in after the M&E trades have finished in an area. We work from your penetration schedule or marked-up drawings. Tell us what records you need and we will confirm with the quote. If you have unsealed joints where partitions meet the slab and openings left by services added after handover, we can help, whatever the surface. Whether you call it commercial sealant work, mastic application or joint sealing, the work in Catford is the same: the right product in a properly prepared joint.

In a London area such as Catford, buildings are refitted often, and every new cable, pipe or duct through a fire-resisting wall or floor leaves a gap. Where the specification names fire-rated sealant, it goes in exactly as the manufacturer’s test evidence shows for that wall or floor.

Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and we explain exactly what that covers when we quote.

Where
Catford (SE6, BR1)
Wider area
Greater London
Guarantee
A 12-month guarantee
Price
Quoted before any work starts
Telephone
01277 525 020
Last updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

After the work

After handover, a little attention goes a long way:

  • Keep product data and details in the fire safety file
  • Have penetrations checked while they can still be seen
  • Leave fire sealant to cure fully before covering it
  • Settle who seals which penetrations at the start of a project

Never top up a fire seal with foam, ordinary silicone or filler. A repair should use the original product, installed the same way, or a new specification from the designer.

On fit-outs, get the fire-stopping specification agreed before the services go in. The designer can then choose details that suit the services planned, and the work runs in step with the M&E.

Catford: questions and answers

Do you seal service penetrations in hotels around Catford?

Yes. We install fire-rated and intumescent sealant where it is specified. Each seal follows the tested detail, and rooms are done in turn.

Do you take on work at healthcare sites like University Hospital Lewisham?

Yes, hospitals are one of the sectors we cover. Work is phased so departments keep running, under the site’s own rules.

Can the sealant be colour-matched?

It depends on the product specified. Some ranges are wide, others limited, so we’ll confirm the colours available for the specified product with the quote.

Do you need to see the site first?

Many jobs can be quoted from photographs, drawings or a joint schedule. If the job needs a look first, we will arrange a visit.

Do your applicators hold CSCS cards?

Yes. We use CSCS-carded applicators, which many sites require.

Does the weather affect the work?

For external joints, yes. The joint has to be dry and within the product’s temperature range, so frost, rain or cold mornings can delay outside work. Inside work is seldom held up.

Is it fine to apply new sealant on top of old?

No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.

Where services cross fire walls in Catford

Approved Document B is the English guidance that covers fire stopping around 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. Our part stays the same: the specified product, installed to its tested detail. Catford has several hotels close by, all within 2 miles. Hotels are divided into compartments, and refurbishments that add pipes and cables through bedroom and corridor walls leave gaps to close.

For a unit at a site such as Bell Green Retail Park, which lies south-west of Catford, any new service through a fire-resisting wall should be sealed to the tested detail. At a college such as Christ the King Sixth Form College, 1.7 miles to the north of Catford, checking penetration seals after summer M&E works is good practice. Hospital estates such as University Hospital Lewisham (0.9 miles north of Catford) are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail.

Catford is about 5 miles east of Streatham, in Greater London. We cover commercial sites throughout Catford, whether it’s a single job or part of a planned programme. Catford is one of 764 places we cover in Greater London for service penetrations.

If you need fire stopping in SE6 and BR1, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. Streets here include Bargery Road, Penerley Road and Inchmery Road. We also cover Bellingham (1 mile south-west), Southend (1 mile south-west), Ladywell (1 mile north), Hither Green (1 mile north-east) and Bell Green (1 mile south-west) for service penetrations. Nearby towns on our patch include London (5 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (9 miles north-west), St Pancras (7 miles north-west) and Shoreditch (6 miles north-west).

Landmarks near Catford

We work on buildings around The London & Rye pub, Trinity Church of England School and Forster Memorial Park and the streets around them. The nearest railway station is Catford Bridge station, about 0.5 miles north-west of the centre. A little further out are Greenwich Castle (2.6 miles north) and University Hospital Lewisham (0.8 miles north). Not far away are Downham Woodland Walk and Knight's Hill.

Map of Catford © OpenStreetMap contributors

Commercial clients in Catford

We work for building owners and managing agents on everything from one building to a spread of sites. Several sites can go on one quote, which keeps the paperwork simple.

CHAS accredited and a Constructionline member, we are straightforward to vet for your supplier list. We’re fully insured, and our insurance certificate can go with the quote.

Different surfaces, different methods

Plastic pipes

Waste and drainage pipes through floors are a frequent case. Whether sealant alone is acceptable depends entirely on the tested detail, and we won’t substitute it for a specified collar.

Masonry and concrete

Block walls and concrete floors are common substrates for penetration seals. Dust and loose debris are cleared out of the opening, so the sealant and any backing sit properly.

What we can’t put right

Sealant solves a lot, but not everything, and we’d rather tell you before you spend money. It won’t fix:

  • Walls or floors that aren’t fire-resisting to begin with
  • Writing the fire-stopping specification
  • Approving the work on behalf of building control

If in doubt, call 01277 525 020 or email drawings and photos and we’ll say what we think.

Where we work in Catford

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

General trades versus a specialist

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.

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

The first thing on site is a walk round with your contact, 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. Most London premises stay occupied while we’re on site, so zones and timings are agreed with whoever manages the building. Phased work keeps the rest of the building in use.

  1. First we go through the drawings, schedule or specification for the seals and ask about anything unclear.
  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. We fit the backing the detail asks for, to the stated depth.
  5. Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
  6. If an opening needs something other than sealant, we tell you instead of improvising.

Getting the site ready

  • Make sure the joints can be reached
  • Send asbestos survey details if the building is pre-2000
  • Tell us your opening times and when work is allowed

Request a quote

Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to call the office on 01277 525 020 or email drawings and photos with what you know.

Ask for a quote

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