Greater London · England

Fire Rated Sealant in Childs Hill

Fire rated sealant across Childs Hill and nearby, with old sealant always removed completely and a one-year guarantee.

  • Damaged fire sealant left by other trades
  • New service routes left unsealed after building work
  • Gaps where walls meet ceilings or slabs

Fire rated sealant in Childs Hill

Fire rated sealant in Childs Hill, done properly

Fire stopping only performs as intended if it’s done to the detail: correct depth, correct backing and a product suited to the surfaces. That detail is what we take care over, one gap at a time. We work on service penetrations, plasterboard & masonry and pipe & cable gaps, and people most often call us about gaps around pipes and cables through fire-resisting walls and gaps left after a refit or conversion.

Commercial work in London comes with its own logistics: loading restrictions, building rules and tight access. For a building in Childs Hill, we agree timings and access before anything starts.

Big or small, you get the same 12-month guarantee.

Location
Childs Hill (NW2, NW3, NW11)
Wider area
Greater London
Cover
12 months on all our work
Quote
A clear price before any work starts
Telephone
0345 464 0079
Updated
26 October 2026
The Mr Mastic team in navy uniforms in front of three Mr Mastic vans

Landlord and commercial work in Childs Hill

Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll give you a quote.

Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.

What we’re called out for in Childs Hill

Sometimes the wrong product was used from the start: ordinary expanding foam, standard silicone or decorators’ caulk in a place that needed a tested fire seal. It may look fine, but it isn’t a fire-rated seal.

The most common problems we see are:

  • Door frames with gaps between frame and wall
  • Holes left by a change of layout
  • Sealant items on a fire risk assessment action list
  • Gaps filled with a product that is not fire-rated

For landlords with property near Cricklewood station, any gap left by new services in shared walls should be closed with a fire-rated product.

What to look for in a quote

  • How long the guarantee is
  • Are they insured?
  • Whether all the old sealant comes out first
  • When the joint can take water or movement

10 questions to ask before booking

DIY sealant or a professional job?

Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.

Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.

Commercial buildings in Childs Hill

Commercial buildings in London often have strict access rules and limited loading, so out-of-hours working can be arranged 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.

For site and facilities teams at buildings such as All Saints' CofE Primary School NW2, gaps opened by contractors for new cabling are a common finding in schools and offices. Childs Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway.

Childs Hill is about 1 mile north-west of West Hampstead, in Greater London. Jobs in Childs Hill get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Childs Hill is one of 764 towns and villages in Greater London where we work for fire rated sealant. London is on our list too, around 6 miles away.

Work in NW2, NW3 and NW11 works the same way as everywhere else we cover. Local streets include Nant Road, Ridge Road and Garth Road, and we cover them all. If you are just outside Childs Hill, we cover Fortune Green (1 mile south), West Hampstead (1 mile south-east), Golders Green (1 mile north), North End (1 mile north-east) and Vale of Health (1 mile east). Within a short drive, we also cover London (6 miles south-east), City of Westminster (4 miles south-east), Marylebone (4 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (6 miles south-east).

Local landmarks in Childs Hill

Locally, jobs take us to homes and businesses close to St Vedasts School For Boys, Hampstead School and The Old Bull and Bush pub. Childs Hill’s nearest station is Cricklewood station, roughly 0.7 miles south-west of the centre. Nearby you will also find O2 Centre (1.2 miles south-east) and New End Hospital (0.9 miles east). For a walk, there’s Parliament Hill and Westbere Copse.

Map of Childs Hill © OpenStreetMap contributors

Aftercare tips

Aftercare is simple, and it makes a real difference:

  • Report cracked or damaged seals as soon as you notice them
  • File the fire-stopping record where your assessor can find it
  • Tell trades working in the building that fire seals must be put back
  • Plan fire stopping into any work that goes through walls or floors

Leave the sealant to cure fully before painting near it. Some fire-rated sealants can be painted and some can’t, so ask us which we used.

A flagged gap shouldn’t wait for the next assessment. Have it sealed, then keep the record.

Surface by surface

Flats and HMOs

Working in occupied flats needs some planning. We agree access to each flat and the common parts before work begins to keep disruption down.

Door frames

A door can only do its job if the gap behind its frame is sealed too. We seal that gap with a fire-rated sealant suited to the frame and wall.

Honest limits

Sealant isn’t the answer to every problem, and we will tell you before work begins. Sealant won’t put right:

  • Big openings where sealant alone isn’t the tested solution
  • Certifying a building or signing off its fire safety
  • Assessing a building’s fire safety

Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.

What we seal

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

What we do, step by step

A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take anything from a few hours to several days, depending on how many gaps there are. In Childs Hill, flats, stairs and shared entrances are part of the routine. 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. Any non-fire-rated filler is removed.
  4. We fit backing where needed and apply the fire-rated sealant to depth.
  5. We hand over a list of locations and products.

Before we arrive

  • Mention any leaks or damp you’ve noticed
  • Let us know about earlier repairs to the joints
  • Where the joints are inside, avoid wetting them before we arrive

Ask for a quote

There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or email us.

Get a price

Read more

Questions from Childs Hill

Do you work in hotels near Childs Hill?

Yes, hospitality work, including hotels, is part of what we do. Work can be planned room by room, and out-of-hours working can be arranged.

Can you help a landlord with a rental near Cricklewood station?

Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will send you a clear quote.

Do you remove the old sealant?

Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.

Do you have insurance?

Yes, we’re fully insured.

Can you tell me which gaps need fire stopping?

No, we don’t assess buildings. Once you have a specification or action list from your assessor or designer, we can quote for the fire-rated sealant items.

Can ordinary silicone be used in a fire-stopping gap?

No. It might close the gap, but it is not a fire-rated seal. Use a product tested for that gap and service.

Is there a guarantee?

Yes. All our work carries a one-year guarantee.

Should I try DIY first?

Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.

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