Fire-rated sealing and fire stopping in Deptford, Greater London
Fire stopping for Deptford, from a contractor working since 2005. Fully insured, with a 12-month guarantee.
- Expanding foam used as fire stopping
- Unsealed penetrations discovered above suspended ceilings
- Unsealed joints where partitions meet the slab
Fire stopping near Deptford
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Questions we’re asked in Deptford
What happens to BS 476 references for fire stopping in Deptford?
Approved Document B loses its BS 476 references from 2 September 2029, and BS EN 13501-2 becomes the route, subject to transitional arrangements. The designer or fire engineer sets the specification, and we install the product to the manufacturer’s tested detail.
Do you work on fire-rated sealing in hotels in Deptford?
Yes. We install fire-rated and intumescent sealant where it is specified. Each seal follows the tested detail, and rooms are done in turn.
What do you charge?
It depends on the job: the volume of work, the access, the specified product and how it’s phased. Call for a fixed quote.
When is resealing likely to be due?
There isn’t a single answer, since movement, weather, cleaning and use all affect it. Regular checks let you plan resealing before leaks or damage.
Is any job too small?
Whatever the size, the process is the same: details, then a fixed price, then sealing, then a 12-month guarantee.
Are you fully insured?
Yes. Mastic Doctor is fully insured, public liability included.
How do I request a quote?
You can use the quote form on this site; alternatively, speak to us on 01277 525 020 or email drawings and photos. Photos, drawings or a joint schedule help us quote quickly.
Fire stopping in Deptford
Every service that crosses a compartment wall or floor leaves an opening, and that opening needs sealing to hold back fire and smoke. Our job is fitting fire-rated and intumescent sealant at those service penetrations, and along linear gaps, where it is the specified product. Each seal follows the manufacturer’s tested detail. If you have openings left by services added after handover and seals that don’t match their tested detail, we can help, whatever the surface. Searching for sealant specialists in Deptford? Mastic Doctor has worked for contractors, FMs and building owners since 2005, with CSCS-carded applicators.
After a fit-out or new cabling in a London building, risers and ceiling voids are where open service gaps tend to be found. If sealant is the specified product we fit it to its tested detail, and if the detail needs something else, you’ll hear it from us.
Our workmanship is guaranteed for 12 months, wherever the site is. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Location
- Deptford (SE8, SE10, SE14)
- Region
- Greater London
- Cover
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Call
- 01277 525 020
- Updated
- 3 November 2026
Fire-rated sealing for Deptford buildings
London’s office and residential buildings are refitted constantly, and each round of cabling or pipework can leave open penetrations. Penetrations are sealed with the specified product, to its tested detail, under the building’s own permit rules. The 2 miles around Deptford include four care or nursing homes. Care homes rely on fire-resisting walls and floors, and maintenance work that breaks through them leaves openings to seal.
On estates like Brookmarsh Industrial Estate (under half a mile east of Deptford), the wall between office and warehouse is often fire-resisting, and cables through it need the specified seal. At a healthcare site like University Hospital Lewisham, 1.7 miles to the south of Deptford, new services through compartment walls are a constant, and each needs the specified seal.
Deptford is about 3 miles south-east of Whitechapel, in Greater London. Across the SE8 postcode area, the process is the same: details in, fixed quote out, then sealing and a 12-month guarantee. 764 places across Greater London fall within our area, including Deptford.
We cover the SE8, SE10 and SE14 postcode districts for service penetrations. Buildings on Mill Lane, Dixon Road and Clare Road are within our area. Deptford sits on or close to the A2209. We also cover New Cross (1 mile south-west), St Johns (1 mile south), Millwall (1 mile north), Isle of Dogs (1 mile north-east) and North Greenwich (1 mile north-east) for service penetrations. Nearby towns on our patch include London (3 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (8 miles west), St Pancras (5 miles north-west) and Shoreditch (4 miles north-west).
Near you in Deptford
In Deptford, that means premises near Addey and Stanhope School, Sue Godfrey Nature Park and Deptford Arms and the streets around them. There’s a railway station in Deptford itself: Deptford station. Other landmarks nearby include Greenwich Castle (1.1 miles east) and Lewisham Shopping Centre (1.3 miles south-east). The countryside around Deptford includes Sue Godfrey Nature Park and Tower Hill.
From enquiry to sign-off
Diagnose, treat, sign off: every visit follows that pattern. We inspect the joints and confirm what’s in scope, then the work is carried out to the specified product and detail, and the job ends with a walk round and sign-off. For a job in Deptford, access comes first. Send the building rules and access times with your enquiry.
- The specification and schedule come first, so we know which details apply.
- We plan the sequence of floors, risers and voids with you.
- We compare every service penetration with its tested detail before sealing.
- Unsuitable material is removed and the opening cleaned so the seal starts clean.
- The specified backing and sealant go in to depth and are finished neatly.
- Anything outside the detail is reported to you rather than sealed.
What we need from you
- Point out any areas we must not close
- Make sure the joints can be reached
- Send your site hours and access windows
Get a fixed quote
Photos, drawings or a schedule of the joints and a fixed quote comes back to you. Where a site visit makes more sense, we will arrange one.
Read more
Maintenance after handover
Regular inspection catches problems early. Specifically:
- Include service cupboards in routine inspections
- Get seals inspected before ceilings and boxing close
- Keep general-purpose fillers away from compartment walls
- Settle who seals which penetrations at the start of a project
Give the sealant its full cure time before ceilings, boxing or decoration go over it. Some fire-rated sealants accept paint and some don’t, so check the product data first.
Write fire stopping into the scope of any work crossing a compartment wall or floor. Then the seal goes in while the area is open instead of being left for someone else.
Why it’s worth doing now in Deptford
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. Access in London is hard enough to arrange once, so it makes sense to deal with every failing joint while access is in place.
Small jobs and large programmes are priced from the same things: scope, access, product and programme. Call for a quote, and you’ll have a fixed figure to work with.
Why clients in Deptford choose us
- CSCS-carded applicators
- Workmanship guaranteed for 12 months
- Sealing commercial buildings since 2005
- Products installed to the manufacturer’s instructions
Take a look at our cost guide and how we’re accredited.
Common problems we fix in Deptford
A common fault is a product that was never fire-rated in the first place: expanding foam or a general-purpose sealant pushed into a gap to tidy it. It may look closed, but it has no tested fire performance in that position and has to be removed.
Any of the following is a good reason to get the joints checked over:
- Hidden openings found during inspections
- Old intumescent sealant that has split away
- Improvised or mixed-product fire seals
- Seals disturbed by maintenance and left open
Tenant changes at centres like New Cross Gate Retail Park, 0.7 miles west of Deptford, often mean new services through walls between units.
What your quote should include
- Whether their applicators hold CSCS cards
- Their plan for phasing and protecting the area
- The terms of the workmanship guarantee
- Their public liability cover
How the quote is worked out
There’s no standard rate for sealant work, since sites vary so much. What we take into account:
- How much there is to seal
- Removal of failed or old sealant
- The site’s rules and procedures
- Which sealant the job calls for
What a job costs comes down to how many linear metres there are, what has to come out first and how the joints are reached. Call for a fixed quote when you are ready.
What to include in your enquiry
For an accurate fixed quote, we need to understand the site. Useful things to include:
- Rough lengths or quantities, or drawings if you have them
- Clear photos of the problem areas
- Any specification or named product
- The type of building and who uses it
To get a fixed quote, ring 01277 525 020 or email drawings and photos. Our quote form is another easy route.
What else we do in Deptford
Different surfaces, different methods
Plastic pipes
Plastic waste pipes through slabs come up often. The detail decides whether sealant alone is enough, and we won’t substitute it for a specified collar.
Cables and cable bundles
New data and power cables are the most common breach we see. We reseal around them to the specified detail, and we tell you if the bundle exceeds what sealant covers.