Fire stopping in Clerkenwell
Work needed on a service penetration in Clerkenwell? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Unsealed joints where partitions meet the slab
- Unsealed penetrations discovered above suspended ceilings
- Snag lists that include open service penetrations
Fire stopping in Clerkenwell
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
About our fire stopping in Clerkenwell
Sealant is the specified answer for plenty of openings, such as metal pipes, cables and some small ducts where the detail covers them. Other openings need collars, wraps, batts, pillows or boards. If the detail calls for something other than sealant, we say so rather than force sealant into it. Most enquiries involve seals disturbed by maintenance and left open and snag lists that include open service penetrations, across linear gaps at wall heads, joints between fire-resisting walls and floors and small duct penetrations where the tested detail allows. Whether you call it commercial sealant work, mastic application or joint sealing, the work in Clerkenwell is the same: the right product in a properly prepared joint.
Fit-outs and M&E works in London buildings often leave service penetrations open behind ceilings and in risers. If sealant is the specified product we fit it to its tested detail, and if the detail needs something else, you’ll hear it from us.
A 12-month guarantee applies to all our work in Greater London. If an installation problem shows up, ring 01277 525 020 or send photos by email and we’ll arrange a return visit.
- Location
- Clerkenwell (N1, EC1V, WC1X)
- Wider area
- Greater London
- Cover
- A 12-month guarantee
- Quote
- A fixed quote before we start
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
Common questions from Clerkenwell clients
Can you work around term dates at a campus such as Paris Dauphine University - London Campus?
Yes. Education sites typically want the work in vacations or in phases during term, and we plan to suit. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.
Can you seal penetrations in a hotel in Clerkenwell after a refit?
Yes, to the specification and the product’s tested detail. We match the product to the wall or floor and the services, and say if something other than sealant is needed.
Do you need to see the site first?
Many jobs can be quoted from photos, drawings or a joint schedule. Where they aren’t, we arrange a site visit.
Who decides which product is used?
A specification, where there is one, decides it. If there isn’t one, it comes down to the joint: its movement, its surfaces and what it has to cope with.
Do you have public liability insurance?
Yes. Mastic Doctor is fully insured, public liability included.
What do you charge?
It depends on the job: the volume of work, the access, the specified product and how it’s phased. Call for a fixed quote and we’ll price it properly.
How soon can the area be used again?
The product and site conditions decide that. Some products skin over quickly but need longer to cure fully, so we’ll confirm the curing time on the day.
Places near Clerkenwell
Also in Clerkenwell
Aftercare for building managers
Keep the joints in good shape with a few simple steps:
- Don’t let anyone top up a fire seal with the wrong product
- Ask the designer to confirm details early on refits
- Leave fire sealant to cure fully before covering it
- Flag new cables with no seal around them
Never top up a fire seal with foam, ordinary silicone or filler. A repair should use the original product, installed the same way.
Ask every contractor who works in risers or voids to report openings they create. It costs little and catches breaches early.
Commercial clients in Clerkenwell
Agents, factors and owners’ representatives all follow the same route: send details, get a fixed quote, we seal, guaranteed. Keys, access and contacts can be agreed in advance.
Building owners and managing agents use us on sealant work across single buildings or whole portfolios around Clerkenwell. Several sites can go on one quote, which keeps the paperwork simple.
When to call us in Clerkenwell
Damage plays a part too. Maintenance work can knock a seal, cut it back for an extra cable or remove it with an old pipe.
What tends to prompt an enquiry:
- Improvised or mixed-product fire seals
- Openings found when ceilings come down for a refit
- Unsealed joints where partitions meet the slab
- Snag lists that include open service penetrations
Where a unit on an estate such as Roman Way Industrial Estate, which lies north of Clerkenwell, has fire-resisting walls between offices and warehouse, any new service through them should be sealed to the tested detail.
Questions to ask before you book
- Whether old or failed sealant will be cut out, not overlaid
- The named product and why it was chosen
- Their plan for phasing and protecting the area
- Proof of insurance
Our process
We bring the products specified for the job, along with primers and backing rod. Any old material is cut back to clean, sound faces, the manufacturer’s primer is applied where it’s called for, and the sealant is tooled off neatly. Planning a London job such as one in Clerkenwell starts with access. Give us the hours we can be on site and we will schedule to suit.
- The specification and schedule come first, so we know which details apply.
- We plan the sequence of floors, risers and voids with you.
- We compare every service penetration with its tested detail before sealing.
- Unsuitable material is removed and the opening cleaned first.
- The specified backing and sealant go in to depth and are finished neatly.
- We tell you about openings that need a different product.
Getting the site ready
- Send asbestos survey details if the building is pre-2000
- Agree which areas must stay open
- Warn occupants and staff about the work
Getting a fixed quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price the work to it. Smaller jobs need nothing more than photos and a few notes.
Related advice
Quoting for work in Clerkenwell
Your fixed quote is built from the real scope. It allows for:
- Removal of failed or old sealant
- Any access equipment needed
- Travel to remote or island sites
- The size and state of each joint
The price depends on the quantity of joints, what has to come out first and the access. Call for a quote when you are ready.
What we need to price the job
We can often quote from photographs and a few details. Please tell us:
- Access details, including height
- Where the site is, with the postcode
- Whether an asbestos survey exists
- Any specification or named product
Every quote starts with the facts: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we will fill any gaps with a visit.
Penetration seals near Clerkenwell
With tenants changing and fit-outs following, London buildings see service routes altered again and again. We seal to the specification and the product’s tested detail, working within the building’s permits. Plenty of hotels sit less than 2 miles from Clerkenwell. Bedroom-to-corridor walls in hotels are normally fire-resisting, so new cabling or pipework through them has to be sealed to the tested detail.
Wherever services are added at a hospital such as Moorfields Eye Hospital (City Road campus) (to the east of Clerkenwell) the compartment line has to be made good with the specified product. For an estates team at a campus like Paris Dauphine University - London Campus, 0.5 miles north-west of Clerkenwell, summer M&E works are typically followed by a round of penetration sealing.
Clerkenwell is about 2 miles north of London, in Greater London. Our applicators travel to Clerkenwell for work on service penetrations. Clerkenwell is one of 764 places in Greater London on our list for service penetrations.
We cover the N1, EC1V and WC1X postcode districts. Among the streets we cover are Long Lane, City Road and Noel Road. With the A1 and A5201 nearby, Clerkenwell is easy to get to with materials and equipment. Nearby places we also cover include Farringdon (1 mile south), Angel (1 mile north), Smithfield (1 mile south), Holborn (1 mile south-west) and St Pancras (1 mile west). Bigger towns within reach include 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).
What’s near Clerkenwell
In Clerkenwell, that means premises near Barts Health Archives, The Sekforde pub and Elizabeth Garrett Anderson School, among other places. Also close by are Tech City College (under half a mile north-east) and King Square Gardens (less than half a mile north-east). There’s a railway station in Clerkenwell itself: Farringdon station. A little further out are Brunswick Centre (0.9 miles west) and Montfichet's Tower (0.9 miles south). The countryside around Clerkenwell includes St. James's Park Lake and Ludgate Hill.
What sealant work can’t fix
Our job is the joint, not everything around it. Sealant alone won’t deal with:
- Plastic pipes whose detail calls for a collar or wrap
- Construction that lacks the fire resistance the seal relies on
- Issuing fire ratings or certificates for seals
If in doubt, phone 01277 525 020 or send photos by email and we’ll say what we think.
What we seal
- Small duct penetrations where the tested detail allows
- Service gaps in risers
- Pipe penetrations
- Linear gaps at wall heads
- Joints between fire-resisting walls and floors
- Cable penetrations