Greater London · England
Fire Rated Sealant in New Southgate
We cover New Southgate for intumescent and fire-rated sealant around gaps, frames and service penetrations. Old material cut out, joints cleaned and sealed neatly.
- Unsealed gaps around fire door frames
- Fire stopping disturbed by later work
- Gaps filled with a product that is not fire-rated
FAQs for New Southgate
Do you take on hotel work around New Southgate?
Yes, we work for hotels as well as homes and businesses. A room-by-room programme keeps most rooms in use while the work goes on.
Is parking an issue for fire rated sealant in New Southgate?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover New Southgate, along with the rest of our area.
Can you give us a record of the work?
Yes. You get a list of where we worked and what we used to keep with your fire safety documents.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Do you come to New Southgate?
Yes. We work in New Southgate. For a quote, ring 0345 464 0079 or email us.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Are you fully insured?
Yes. Full insurance covers our work.
Fire rated sealant in New Southgate, done properly
We often work from an action list drawn up by a fire risk assessor for buildings in New Southgate. If you share the list, we can quote for the gaps that need fire-rated sealant. We work on plasterboard & masonry, linear gaps and service penetrations, and the jobs we see most are gaps around pipes and cables through fire-resisting walls and standard silicone or caulk in a fire-stopping gap.
Commercial work in London comes with its own logistics: loading restrictions, building rules and tight access. Timings and access are agreed with the building before work starts in New Southgate, and room-by-room programmes can be planned where needed.
Each job carries a 12-month guarantee.
- Place
- New Southgate (N11, N10, N14)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
The work is kept neat and contained to the area we’re working on, so you can get on with your day. The job usually takes a few hours for a handful of gaps, and longer for a whole building, and we tell you how long to leave it before we go. In New Southgate, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- Access to each area is agreed so the work can run in order.
- We take out any damaged or unsuitable sealant.
- Gaps are cleaned of dust and loose material.
- We apply and tool the sealant to the product’s tested detail.
- Locations and products are written up and any gaps unsuitable for sealant are flagged.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Let us know about stairs, lifts or work at height
- Mention any leaks or damp you’ve noticed
Get a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we will come back to you with a quote.
Related advice
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Issuing a fire rating or certificate for a building
- Large holes that need a different fire-stopping system
- Fire risk assessments, which need a qualified assessor
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer.
Where we work in New Southgate
- Door frames
- Flats & HMOs
- Plasterboard & masonry
- Linear gaps
- Service penetrations
- Pipe & cable gaps
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Do not paint over fire sealant until it has cured
- Include hidden areas like risers in routine checks
- Include fire stopping when you schedule refits
- Flag any open gap you spot round a pipe or cable
Let contractors know where fire stopping has been done, and make sure anything they disturb is resealed with a suitable product. A lot of damaged fire stopping comes from later work.
Any job that breaks through a wall or ceiling should include resealing. Doing it at the time avoids leaving gaps behind.
What fire rated sealant looks like in New Southgate
Commercial buildings in London often have strict access rules and limited loading, and out-of-hours working is possible to arrange. New Southgate has hotels and guest accommodation in and around it. For hotels, a room-by-room programme keeps most rooms in use while the work goes on.
For buildings such as St Paul's Church, gaps around pipes and cables are worth checking after any building work there. For landlords with property near New Southgate station, any gap left by new services in shared walls should be closed with a fire-rated product.
New Southgate is about 2 miles north-east of Finchley, in Greater London. Wherever you are in the N11 postcode area, our applicators can take on fire rated sealant. We cover 764 towns and villages across Greater London. For nearby work, see our London page, about 8 miles away.
We cover every part of N11, N10 and N14 for fire rated sealant. Whether your property is on High Road, Orion Road and Atlas Road or anywhere close by, our applicators can take on the job. With the A1003 and A1110 close by, New Southgate is simple for us to get to. Other places close to New Southgate include Friern Barnet (1 mile west), Arnos Grove (1 mile east), Bounds Green (1 mile south-east), Brunswick Park (1 mile north) and Southgate (1 mile north). Larger places within reach include London (8 miles south), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (8 miles south), St Pancras (6 miles south) and Shoreditch (7 miles south-east).
Local landmarks in New Southgate
In New Southgate, that means homes and buildings near Friern Barnet School, Ming-Ai and The Ranelagh pub. Other local landmarks include O. R. Tambo Recreation Ground (0.9 miles south-east) and Francis Skaryna Belarusian Library and Museum (1.8 miles west). There’s a railway station in New Southgate itself: New Southgate station. Nearby you will also find Grand Arcade (1.5 miles west) and Broomfield House Museum (1.1 miles east). The countryside around New Southgate includes Barfield Allotments Nature Park and Highgate Hill.
Why it’s worth doing now in New Southgate
Sealant isn’t the fix for every opening. Big openings, bundles of cables and plastic pipes may need batts, collars or wraps instead. We will say so if a gap needs something other than sealant. In a flat in New Southgate, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Doing several joints on one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why choose Mr Mastic in New Southgate
- ARBOMaster approved applicator
- More than 20 years in sealant work
- Rated 4.9 stars on Google
- Experience in homes, commercial sites and hotels
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
What we are called out for in New Southgate
Over time, buildings change layout and use. Conversions to flats and HMOs, and office refits, create new walls and new routes for services, with gaps to match.
Common reasons people contact us are:
- Open holes round services passing through fire walls
- Cracked or shrunken fire-rated sealant
- Gaps where walls meet ceilings or slabs
- Gaps flagged on a fire risk assessment
Schools such as St Paul's CofE Primary School N11 are buildings too, and service openings in fire-resisting walls need checking after any refurbishment.
What your quote should include
- When the joint can take water or movement
- How the joint is cleaned and prepared
- How the colour is chosen
- What insurance they hold
For landlords and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
If you manage several properties in or around New Southgate, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.