Fire-rated sealing and fire stopping in Lee, Greater London
Fire-rated and intumescent sealing of service penetrations and linear gaps throughout Lee and nearby, by CSCS-carded applicators. CHAS accredited and fully insured.
- Old intumescent sealant that has split away
- Head-of-wall gaps with no fire seal
- Damaged fire seals in risers and voids
Fire stopping across Lee
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
About our fire stopping in Lee
It helps to set out our role at the start. Deciding the specification sits with the designer, the fire engineer and building control. We fit the specified fire-rated sealant following that specification and the maker’s installation guidance on buildings around Lee. Most enquiries involve damaged fire seals in risers and voids and snag lists that include open service penetrations, on linear gaps at wall heads, service gaps in risers and joints between fire-resisting walls and floors. Facilities teams, main contractors and managing agents in Lee tend to want the same three things: a clear scope, tidy work and joints that don’t fail again.
Taller residential buildings in London may fall under the Building Safety Act’s higher-risk regime, where fire-stopping records get close attention. We install what the designer or fire engineer has specified, and if you need records of the work, tell us and we’ll confirm with the quote.
Every job is signed off with a 12-month guarantee. The promise is simple: if our work fails within that year, we put it right.
- Location
- Lee (SE12, SE13, SE3)
- Wider area
- Greater London
- Guarantee
- 12 months on every job
- Price
- A fixed quote before we start
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
From enquiry to 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. Then we strip out anything that has failed, prepare every joint and seal it. Planning a London job such as one in Lee starts with access: booked loading, goods lifts, the building’s permit system and a spot to keep materials. 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.
- Foam, ordinary sealant and debris come out first.
- 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
- Send asbestos survey details if the building is pre-2000
- Clear stock, furniture or equipment away from the joints
- Let us know about inductions and permits
Getting a fixed quote
Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price against exactly what is specified. Smaller jobs need nothing more than photographs and a few notes.
Read more
Doing it in-house
What you see is the finished bead, but most of the work is hidden. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.
Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and we will confirm the paperwork you need with the quote.
Where services cross fire walls in Lee
Approved Document B is the English guidance that covers fire stopping around openings and penetrations. References to the older BS 476 classes are being removed from it from 2 September 2029, after which the European classification, BS EN 13501-2, is the route, subject to transitional arrangements. What we install is set by the specification, and it goes in to the tested detail. In London buildings, frequent fit-outs and M&E changes are a common reason fire stopping gets breached. We seal to the specification and the product’s tested detail, working within the building’s permits.
Residences at universities like University of Greenwich - Greenwich Campus, 2.2 miles to the north of Lee, have compartment walls that must be resealed whenever services change. In a retail centre such as Lewisham Shopping Centre, 1.1 miles to the north-west of Lee, any fire-resisting wall between units that is crossed by new services needs sealing to the tested detail.
Lee is about 2 miles south of Greenwich, in Greater London. Our applicators travel to Lee for work on service penetrations. Our Greater London coverage takes in 764 places. There’s a separate page for London, about 6 miles away.
We cover the SE12, SE13 and SE3 postcode districts for service penetrations. Buildings on Old Road, Manor Lane and Mallet Road are within our area. Nearby places we also cover include Hither Green (1 mile west), Horn Park (1 mile south-east), Lewisham (1 mile north-west), Ladywell (1 mile west) and Blackheath (1 mile north). A short drive away, we cover London (6 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (10 miles west), St Pancras (7 miles north-west) and Shoreditch (6 miles north-west).
Near you in Lee
Recent enquiries here include premises near Manor House Gardens, Trinity Church of England School and International Academy of Greenwich and the streets around them. There’s a railway station in Lee itself: Lee station. Well-known places in the area include Lewisham Shopping Centre (1.1 miles north-west) and Prefab Museum (1.3 miles south). For a walk, there’s Summer Hill and Birdbrook Road Nature Reserve.
Why it’s worth doing now in Lee
Fire stopping is a regular point raised at inspections and handover. Finding unsealed or improvised openings late can hold up a programme which is why earlier is better. In Lee, each extra visit means more notices, permits and disruption, so cutting the old sealant out fully and doing it right once is the better route.
Cost follows what’s involved: removing old material, preparing the joints, the product, the access and how the work is phased. Call for a fixed quote and we will explain how it’s made up.
Why choose Mastic Doctor in Lee
- 12-month guarantee on workmanship
- Work to your specification and the manufacturer’s guidance
- Clear, fixed quotes
- One contact handling all your sites
See how commercial sealant jobs are priced or our accreditations.
Common questions from Lee clients
Will you take on work at estates like Chiltonian Industrial Estate, close to Lee?
Yes, sites like Chiltonian Industrial Estate are within our area, along with the rest of Lee. To start, just call 01277 525 020 or email a schedule or drawings with the unit, the joints involved and your access times.
Do you work on fire-rated sealing in hotels in Lee?
Yes, where fire-rated sealant is the specified product. We match the product to the wall or floor and the services, and say if something other than sealant is needed.
Can the sealant be colour-matched?
That 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.
Will you quote for a small job?
Whatever the size, the process is the same: send details, get a fixed quote, we seal, guaranteed.
Who decides which product is used?
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.
Can weather delay the job?
It can, when the joints are outside. Sealant won’t bond properly to a wet or frosty joint, so external work may be moved if conditions aren’t right. Internal work is far less affected.
Can you work while the building is occupied?
Yes, as long as we plan it. We agree a sequence with your contact so just one area at a time is disrupted.
What we can’t put right
A proper diagnosis includes knowing what sealant can’t do. We will tell you if the real problem is any of the following:
- Walls or floors that aren’t fire-resisting to begin with
- Plastic pipes whose detail calls for a collar or wrap
- Fire risk assessments, a job for a competent assessor
If you are not sure, just speak to us on 01277 525 020 or email us and we’ll give you a straight answer.
What we seal
- Pipe penetrations
- Cable penetrations
- Small duct penetrations where the tested detail allows
- Linear gaps at wall heads
- Service gaps in risers
- Joints between fire-resisting walls and floors
How the job changes by surface
Cables and cable bundles
Data cabling added after handover is a regular cause of open service penetrations. We reseal around them to the specified detail.
Small ducts
Small ductwork can sometimes be sealed with sealant where the tested detail includes it. Larger or fire-rated ductwork typically needs a different solution set by the designer and we flag that rather than guess.
More services for Lee
When to call us in Lee
Damage plays a part too. Seals get knocked during maintenance, cut back to add a cable or pulled out when services are swapped, and the repair is often skipped.
It’s worth sending us details if you spot any of the following:
- Seals that don’t match their tested detail
- Seals disturbed by maintenance and left open
- Old intumescent sealant that has split away
- Openings found when ceilings come down for a refit
Hospital estates such as Blackheath Hospital (0.8 miles north of Lee) are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail.
Comparing quotes
- Their pre-qualification and accreditations
- How joint depth will be controlled
- How they handle RAMS and site documents
- How long is the guarantee, and what does it include?