Greater London · England
Fire-rated sealant in Lee, Greater London
Intumescent and fire-rated sealant around gaps, frames and service penetrations for homes and businesses in Lee and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps flagged on a fire risk assessment
- Gaps filled with a product that is not fire-rated
- Old fire sealant that has split or come away
Fire rated sealant in Lee, done properly
Where services or frames pass through a fire-resisting wall or floor, the gap around them needs a fire-rated seal. Each gap is sealed to the product maker’s tested detail for its size and substrate, with a record of the products and locations if you need one. We work on door frames, flats & HMOs and linear gaps, and people most often call us about cracked or shrunken fire-rated sealant and open gaps behind door architraves.
Across London, offices, shops, hotels, student halls and blocks of flats all need sealant work from time to time, whether that’s washroom resealing or fire-rated sealant around service openings. Out-of-hours working can be arranged where a building in Lee cannot close.
A one-year guarantee comes as standard.
- Where
- Lee (SE12, SE13, SE3)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How it works
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before any work begins. Most jobs take from a few hours to a few days, depending on the number of gaps and the access. In a London area like Lee, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We go through the gaps on your list or survey and check each one’s size and substrate.
- Anything that isn’t fit for the job comes out, and the gap is cleaned.
- We put in whatever backing or fill the product detail specifies.
- The sealant goes in to the depth its detail sets, then it’s tooled off.
- Locations and products are noted so you have them on file.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Clear items away from the joints we are working on
- Let us know if you’ve seen damp or leaks
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or email us.
Related advice
Surface by surface
Service penetrations
Wherever a service goes through a fire-resisting wall or floor, there’s a gap around it. We seal it with a product tested for that service and gap size.
Door frames
Frame gaps are usually hidden behind the architrave. Where it’s open, we seal it to the product’s details for that gap size.
Why deal with it now?
For some gaps, sealant isn’t the right answer and another system is needed. Large holes, cable bundles and plastic pipes can call for batts, collars or wraps. If a gap is not suitable for sealant, we’ll tell you. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in Lee
- Homes, businesses and hotels
- 20+ years of sealant experience
- Arbo and Everbuild products
- Anti-fungal silicone where joints get wet
Read our cost guide and what customers say.
Quotes for fire rated sealant in Lee
Your quote is based on your job. We take into account:
- Any mould that needs treating
- How many rooms, windows or areas are involved
- The product the joint needs
- Access and height
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Helping us quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The rough size of the job
- The type of property
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Sign-off of the building, which sits with building control or your assessor
- Big openings where sealant alone isn’t the tested solution
- Problems with the door itself rather than the gap around the frame
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
What we seal
- Flats & HMOs
- Linear gaps
- Pipe & cable gaps
- Plasterboard & masonry
- Door frames
- Service penetrations
Your questions about fire rated sealant in Lee
Do you work for hotels and guest houses in Lee?
Yes, we work for hotels as well as homes and businesses. Rooms can be done a few at a time, so the building stays open.
Do you work for landlords with property near Lee station?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
What does fire rated sealant cost?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Will you assess my building’s fire safety?
No. That is for a fire risk assessor, designer or building control. We apply fire-rated sealant to the requirements they set.
Can you do several jobs on one visit?
Yes, we can. More than one area can be quoted together.
Will we have a record of what was sealed?
Yes. You get a list of where we worked and what we used for your files.
Workplaces and buildings in Lee
Lee has hotels and guest accommodation in and around it. Hotel work can be planned room by room, with out-of-hours working where needed. In England, the Regulatory Reform (Fire Safety) Order 2005 requires a fire risk assessment for workplaces and for the common parts of blocks of flats, which is often where open fire-stopping gaps are first noticed. We apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details.
If you let a flat or house near Lee station, fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through. If you look after a building such as Brindishe Lee School, service openings in fire-resisting walls need checking after any refurbishment.
Lee is about 2 miles south of Greenwich, in Greater London. If you need fire rated sealant in Lee, please call 0345 464 0079 or drop us an email for a quick quote. We cover Greater London from our Crawley base. Our Greater London coverage runs to 764 places, and Lee is one of them. You can also see our page for London, about 6 miles away.
All of SE12, SE13 and SE3 is within our area for fire rated sealant. If you need fire rated sealant at a property on Old Road, Manor Lane and Mallet Road or anywhere close by, our applicators can take on the job. Close by, we work in 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). Further out, we also 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).
Around Lee
Around Lee, our work takes us to homes and buildings near Manor House Gardens, Trinity Church of England School and International Academy of Greenwich. Lee has its own railway station: 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.
Common problems we fix in Lee
Movement in the structure can open gaps too: cracked or debonded sealant leaves an open route through the wall. Knocks, maintenance and building work damage it further.
Look out for these signs:
- Fire seals that have cracked with movement
- Standard silicone or caulk in a fire-stopping gap
- Door frames with gaps between frame and wall
- Damaged fire sealant left by other trades
Community buildings like Church of the Good Shepherd are part of the picture too: service openings in its walls need the right fire-rated sealant, as in any building.
Before you book anyone
- Whether they’re fully insured
- How the surfaces are prepared before sealing
- Whether the sealant suits the joint
- What happens if the job turns out different
More services for Lee
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Get damaged fire seals looked at promptly
- Make resealing part of every contractor’s brief
- Check risers, ceiling voids and cupboards during building checks
- Take pictures of fire stopping before ceilings or boxing go back
Tell other trades that the gaps have been sealed, and ask them to reseal anything they cut through. A lot of damaged fire stopping comes from later work.
Small gaps around services are simple to deal with while there are only a few. Leave them and each new job adds another hole and the job gets bigger.