Greater London · England

Clerkenwell Fire Rated Sealant

We cover Clerkenwell for intumescent and fire-rated sealant around gaps, frames and service penetrations. Old sealant removed completely, joints prepared properly.

  • Ordinary sealant used where a fire-rated product was needed
  • Holes left by a change of layout
  • Gaps around pipes and cables through fire-resisting walls

Trusted fire rated sealant in Clerkenwell

Commercial buildings in Clerkenwell

There are hotels and other places to stay in and around Clerkenwell. For hotels, a room-by-room programme keeps most rooms in use while the work goes on. Commercial buildings in London often have strict access rules and limited loading, so out-of-hours working can be arranged where needed.

Managing a site like St Peter and St Paul RC Primary School? Then service openings in fire-resisting walls need checking after any refurbishment. For landlords with property near Farringdon station, any gap left by new services in shared walls should be closed with a fire-rated product. Clerkenwell is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.

Clerkenwell is about 2 miles north of London, in Greater London. Clerkenwell gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 764 places across Greater London, large and small.

We work across the N1, EC1V and WC1X postcode area for fire rated sealant and the streets around it. Fire rated sealant is available to properties on Long Lane, City Road and Noel Road. Being close to the A1 and A5201, Clerkenwell is easy for our applicators to reach for fire rated sealant. Nearby, we also carry out fire rated sealant in Farringdon (1 mile south), Angel (1 mile north), Smithfield (1 mile south), Holborn (1 mile south-west) and St Pancras (1 mile west). We also work in nearby towns such as Kensington (5 miles south-west), Walthamstow (5 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west), Brompton (3 miles south-west) and Stockwell (4 miles south).

Near you in Clerkenwell

In Clerkenwell, that means homes and buildings near Barts Health Archives, The Sekforde pub and Elizabeth Garrett Anderson School, among other places. Nearby too are Tech City College (within half a mile north-east) and King Square Gardens (less than half a mile north-east). Clerkenwell has its own railway station: Farringdon station. Other landmarks nearby include Brunswick Centre (0.9 miles west) and Montfichet's Tower (0.9 miles south). For a walk, there’s St. James's Park Lake and Ludgate Hill.

Map of Clerkenwell © OpenStreetMap contributors

How we handle fire rated sealant in Clerkenwell

A gap around a door frame, a linear joint at the head of a wall and a hole round a pipe are each sealed differently. Measuring the gap and checking what it’s made of comes first, then the sealant goes in to the depth the product’s details set. Typical jobs include new service routes left unsealed after building work and unsealed gaps around fire door frames, on service penetrations, door frames and pipe & cable gaps.

London blocks of flats carry pipes and cables through walls and floors in their common parts and service risers. For managing agents and building owners in Clerkenwell, that can mean fire-rated sealant around service openings as well as resealing in shared washrooms and kitchens.

We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.

Location
Clerkenwell (N1, EC1V, WC1X)
Wider area
Greater London
Guarantee
A year, on every job
Quote
A clear quote up front
Telephone
0345 464 0079
Page updated
26 October 2026
Eleven members of the Mr Mastic team standing in front of branded white vans

Can I do it myself?

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.

A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.

How the job changes by surface

Flats and HMOs

In occupied buildings, we plan the order of work with you. Access to flats and common areas is agreed in advance so residents know what to expect.

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.

What happens on the day

When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to several days, depending on how many gaps there are. In Clerkenwell, 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.

  1. Access to each area is agreed so the work can run in order.
  2. We take out any damaged or unsuitable sealant.
  3. Gaps are cleaned of dust and loose material.
  4. The fire-rated or intumescent sealant is applied and tooled to the tested detail.
  5. Locations and products are written up and any gaps unsuitable for sealant are flagged.

Before we arrive

  • Try not to wet indoor joints just before the visit
  • Mention any parking rules near the property
  • Keep pets and children clear of the area while we work

Ask for a quote

There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.

Get a price

Related advice

When something else is needed

New sealant can’t fix everything, and we’ll tell you before we start. Sealant will not put right:

  • Certifying a building or signing off its fire safety
  • A wall that isn’t a fire-resisting element to begin with
  • Big openings where sealant alone isn’t the tested solution

If you’re not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer before booking.

Joints and surfaces we work on

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

Quotes for fire rated sealant in Clerkenwell

The price is agreed before any work begins. It takes into account:

  • When we can work, for business premises
  • The amount of work
  • The type of sealant required
  • How easy the joints are to reach

Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.

Helping us quote

There’s no need for technical detail. It helps if you can tell us:

  • Where the job is, and your postcode
  • The type of property
  • How we’d reach the joints
  • If someone has resealed it before

For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before any work starts.

Clerkenwell questions

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

Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.

Do you take on hotel work around Clerkenwell?

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.

How long does the job take?

As a guide, most jobs take a few hours for a handful of gaps, and longer for a whole building. Larger jobs naturally take longer.

Is the work guaranteed?

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

Can you fill the gap behind a fire door frame?

Yes, if the gap is within the product’s tested range. Our work is the gap around the frame, and we’ll mention anything we notice about the door.

Do I have to be there?

For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.

Do you have insurance?

Yes. We are fully insured, with over 20 years’ experience in sealant work.

What do you need from me for a quote?

The location, the problem and the rough size of the job. If you can, email a few pictures.

Work for landlords, hotels and businesses

Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.

We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.

Aftercare tips

How long the joints last depends on use and care. We suggest:

  • Allow for resealing whenever new services are run
  • Check whether a sealant can be painted before decorating over it
  • Keep photos of seals that will be hidden
  • Include hidden areas like risers in routine checks

Do not add foam, filler or ordinary sealant over a fire seal. If it needs repair, use the same type of product. We can tell you which product we used.

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.

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