Greater London · England

Brondesbury Fire Rated Sealant

Fire rated sealant for Brondesbury, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.

  • Ordinary sealant used where a fire-rated product was needed
  • Gaps flagged on a fire risk assessment
  • Gaps left after a refit or conversion

Fire rated sealant for Brondesbury homes and businesses

Landlords, agents and businesses in Brondesbury

We also work for property managers and facilities teams in Brondesbury and across Greater London. We can quote a run of properties together, and we are fully insured for the work.

We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.

Fire rated sealant for homes and businesses in Brondesbury

Until it’s heated, intumescent sealant behaves like an ordinary sealant; in a fire it expands into the joint. The right product depends on the gap size, the substrate and what passes through, so we follow the tested detail for each one. If you have joints picked up in a fire-stopping survey and gaps filled with a product that isn’t fire-rated, we can put it right, whatever the surface.

London’s offices, shops, hotels, student accommodation and blocks of flats all have joints to look after, whether that is washroom resealing or fire-rated sealant around service openings. Where a building in Brondesbury needs to stay open, work can be planned outside normal hours.

Your job is guaranteed for a year, as with all our work.

The Mr Mastic team in navy uniforms in front of three Mr Mastic vans
Where
Brondesbury (NW6, NW2, NW10)
Wider area
Greater London
Guarantee
12 months on all our work
Quote
A clear quote up front
Phone
0345 464 0079
Updated
26 October 2026

What we can’t put right

New sealant cannot fix everything, and we’ll tell you before work begins. It won’t solve:

  • A wall that is not a fire-resisting element to begin with
  • Deciding what fire stopping a building needs
  • Doors that aren’t fire doors in the first place

If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before you book.

Where we work in Brondesbury

  • Service penetrations
  • Pipe & cable gaps
  • Linear gaps
  • Plasterboard & masonry
  • Flats & HMOs
  • Door frames

How to look after the new joints

Good habits help new joints last longer. A few tips:

  • Ask every contractor to reseal any fire stopping they disturb
  • Keep general-purpose foam and caulk away from fire-stopping gaps
  • File the fire-stopping record where your assessor can find it
  • Keep photos of seals that will be hidden

Any fire seal that’s cut or drilled needs resealing to its tested detail. If you need new services through a sealed wall, plan the fire stopping as part of the job.

It’s easiest to seal gaps while they’re few and easy to reach. Over time, more work adds more holes.

Fire rated sealant around Brondesbury

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 work to the specification you’re given, installing the product to its tested details. There are hotels and other places to stay in and around Brondesbury. Hotel work can be planned room by room, with out-of-hours working where needed.

Brondesbury is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you look after a church, hall or community building such as Christ Church, gaps around pipes and cables are worth checking after any building work there.

Brondesbury is about 1 mile north of Kilburn, in Greater London. From the centre of Brondesbury to the outskirts, fire rated sealant is available for homes and businesses alike, from flats and houses to offices and hotels. Brondesbury is one of 764 towns and villages in Greater London we cover. We also work in London, about 6 miles from Brondesbury.

Jobs for fire rated sealant in NW6, NW2 and NW10 is quoted and booked the same way as anywhere else. That includes homes and businesses on Dyne Road, Mill Lane and The Avenue and the roads around them. Main roads around Brondesbury include the A4003. If you’re just outside Brondesbury, we cover Kilburn (1 mile south), Cricklewood (1 mile north-west), Queen's Park (1 mile south), Kensal Rise (1 mile south-west) and Willesden Green (1 mile west). We also work in nearby towns such as London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (3 miles south), St Pancras (4 miles east) and Shoreditch (6 miles east).

Local landmarks in Brondesbury

In Brondesbury, that means homes and buildings near Black Lion pub, Kilburn Grange Park and Brondesbury College, among other places. Brondesbury has its own railway station: Brondesbury station. Nearby you’ll also find New End Hospital (1.5 miles north-east) and Brent Museum and Archives (1 mile west). For a walk, there’s Primrose Hill and Westbere Copse.

Map of Brondesbury © OpenStreetMap contributors

DIY versus a professional finish

If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.

A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.

Brondesbury questions

I let a flat near Brondesbury station. Can you help?

Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.

Is parking an issue for fire rated sealant in Brondesbury?

London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.

Is there any odour?

Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.

Are you fully insured?

Yes. Full insurance covers our work, and we can confirm the details when we quote.

Do you provide details of the products used?

Yes. Every gap we seal is listed with the product used so it’s there for the next inspection.

Can you seal over the old sealant?

No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.

What’s the difference between intumescent and fire-rated sealant?

Fire-rated is the broad term for sealants tested for fire stopping. Intumescent types expand when heated, and they’re one of the options. The specification and the tested detail decide which is used.

Can I choose the sealant colour?

Normally, yes. White, clear and grey are common, and other colours are available, and we agree the colour with you before we start.

The process

When we arrive, we look over the joints with you first. We protect the surfaces around the joints before any work begins. The work generally takes from a few hours to a few days, depending on the number of gaps and the access. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.

  1. We begin by agreeing the list of gaps from your assessor’s or designer’s requirements.
  2. We measure every gap and note what it’s in and what passes through.
  3. Unsuitable material such as ordinary foam or silicone is cut out.
  4. We fit backing where needed and apply the fire-rated sealant to depth.
  5. Every location is recorded with the product used.

Getting ready for the visit

  • Let us know about stairs, lifts or work at height
  • Tell us about any water getting in
  • For business premises, tell us about site rules or sign-in

Getting a quote

Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work.

Get a quick quote

Read more

What the job involves on each surface

Flats and HMOs

Conversions generally leave a mix of old and new service holes. The gaps on your list are sealed with a fire-rated product and record where they are.

Linear gaps

Head-of-wall gaps are often hidden above suspended ceilings. We seal them along their full length so there are no open sections left.

When to call us in Brondesbury

Buildings are refitted and reconfigured over the years. Conversions to flats and HMOs, and office refits, create new walls and new routes for services, with gaps to match.

Keep an eye out for these signs:

  • Gaps filled with a product that is not fire-rated
  • Cracked or shrunken fire-rated sealant
  • Door frames with gaps between frame and wall
  • Holes left by a change of layout

Schools such as North West London Jewish Day School are buildings too, and fire-stopping around service openings should be restored whenever new services go in.

Comparing quotes

  • What insurance they hold
  • Whether you can choose the colour
  • When the joint can take water or movement
  • Is VAT in the price?

Choosing a sealant specialist

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job