Fire-rated sealing and fire stopping in Dollis Hill, Greater London
Fire-rated and intumescent sealing of service penetrations and linear gaps in Dollis Hill and across Greater London. CHAS accredited and fully insured, with a 12-month guarantee.
- Openings found when ceilings come down for a refit
- Open linear gaps along the top of fire-resisting walls
- Penetration schedules that need working through
Need fire stopping in Dollis Hill?
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
After the work
Sealant joints are maintenance items, and their life depends on movement, exposure, cleaning and use. We suggest:
- File the specified details where the next contractor can find them
- Settle who seals which penetrations at the start of a project
- Report damaged or disturbed seals as soon as they’re spotted
- Check risers and ceiling voids after each round of works
Give the sealant its full cure time before ceilings, boxing or decoration go over it. Not every fire-rated product can be painted, and the data sheet says which.
Specify fire stopping early on refits, not as an afterthought. The designer can then choose details that suit the services planned, and the work runs in step with the M&E.
How we handle fire stopping in Dollis Hill
Facilities managers in Dollis Hill often find open service penetrations when ceilings come down for other work. Where the walls and floors already have a fire-stopping specification, we can work to it, matching the product and detail it names. With no specification in place, the first step sits with your designer or fire engineer, not with us. We work on service gaps in risers, linear gaps at wall heads and pipe penetrations, and the usual reasons a site gets in touch are non-fire-rated filler around services and hidden openings found during inspections. Facilities teams, main contractors and managing agents in Dollis Hill tend to want the same three things: a clear scope, tidy work and joints that don’t fail again.
In a London area such as Dollis Hill, buildings are refitted often, and every new cable, pipe or duct through a fire-resisting wall or floor leaves a gap. Where the specification names fire-rated sealant, it goes in exactly as the manufacturer’s test evidence shows for that wall or floor.
Our workmanship is guaranteed for 12 months, wherever the site is. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Location
- Dollis Hill (NW2, NW10, NW9)
- Wider area
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Surface by surface
Linear joints
Head-of-wall gaps, slab edges and wall junctions are linear joints. BS EN 1366-4 testing sets the joint widths, depths, backing and movement a seal covers.
Risers and ceiling voids
Openings above suspended ceilings are easy to miss. We follow your schedule area by area, and note anything we find that isn’t on it.
What we’re called out for in Dollis Hill
Openings in fire-resisting walls usually appear when services are added or changed. New cabling, rerouted pipework or a data route drilled through a riser leaves an opening that nobody returns to. Across several fit-outs, the openings add up.
Most enquiries start with something like this:
- Fire-stopping items raised at inspection or handover
- Old intumescent sealant that has split away
- Improvised or mixed-product fire seals
- Unsealed penetrations discovered above suspended ceilings
For a unit at a site such as Brent Cross Shopping Park (0.7 miles north-east of Dollis Hill), any new service through a fire-resisting wall should be sealed to the tested detail.
Before you book anyone
- Proof of insurance
- Whether primer will be used where the manufacturer specifies it
- The named product and why it was chosen
- How they handle RAMS and site documents
Why act early in Dollis Hill
An improvised seal can look finished while offering no tested performance. Correcting it means cutting it out and starting again with the specified product, so it makes sense to get it right first time. In Dollis Hill, each extra visit means more notices, permits and disruption, so cutting the old sealant out fully and doing it right once is the better route.
Pricing service penetrations depends on how many there are, their condition and the access, and any specification that applies. Call for a quote.
Why choose Mastic Doctor in Dollis Hill
- A Constructionline member, so easy to vet
- One number for every site we cover
- Products installed to the manufacturer’s instructions
- Our applicators hold CSCS cards
Read how commercial sealant jobs are priced or how we’re accredited.
Fire stopping in Dollis Hill: the local picture
London’s office and residential buildings are refitted constantly, and each round of cabling or pipework can leave open penetrations. Where fire-rated sealant is specified, we install it to the tested detail under the building’s permit-to-work arrangements. Three care or nursing homes sit less than 2 miles from Dollis Hill. In a care home, any new pipe or cable through a fire-resisting wall should be sealed to the specified detail.
At a university such as Middlesex University, 2.2 miles north of Dollis Hill, labs, lecture blocks and residences are re-serviced often, so penetration seals are best checked after M&E work. Workshops and IT rooms at colleges like College of North West London (0.9 miles south-west of Dollis Hill) are re-serviced often, leaving penetrations to seal.
Dollis Hill is about 1 mile north-east of Neasden, in Greater London. Any commercial site in Dollis Hill is covered. We work across 764 places in Greater London. For work in that direction, see our London page.
Work on service penetrations is covered throughout NW2, NW10 and NW9, for business premises of every kind. Among the streets we cover are Brook Road, Lane Close and Crest Road. Nearby places we also cover include Staples Corner (1 mile north-east), Neasden (1 mile south-west), Cricklewood (1 mile south-east), Willesden (1 mile south) and Brent Cross (1 mile north-east). Further afield, our area takes in London (7 miles south-east), City of Westminster (5 miles south-east), Marylebone (5 miles south-east), Kensington (5 miles south), St Pancras (6 miles south-east) and Shoreditch (7 miles east).
Around Dollis Hill
Recent enquiries here include premises near Woodfield School, The Crown Public House and Gladstone Park. There’s a railway station in Dollis Hill itself: Brent Cross West station. A little further out are Brent Cross Shopping Centre (1 mile north-east) and St Andrew's Hospital (less than half a mile south). For a walk, there’s Darland's Lake and Parliament Hill.
From enquiry to sign-off
We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. With the paperwork done, we take the joints in the sequence agreed with you, and each area is checked before we leave it. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- First we go through the drawings, schedule or specification for the seals and ask about anything unclear.
- On site, each opening is checked against the tested detail it is meant to follow.
- Unsuitable fillers and loose debris are taken out of each opening.
- We fit the backing the detail asks for, to the stated depth.
- Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
- Openings that need a collar, wrap, batt or other product are flagged to you rather than filled with sealant.
What we need from you
- Share your working hours and any access restrictions
- Point out parking and an unloading spot
- Confirm the product named in the specification
Getting a fixed quote
Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To start the process, speak to us on 01277 525 020 or email a schedule or drawings.
Advice
When something else is needed
Part of a good diagnosis is knowing where sealant stops. You will hear from us if the cause turns out to be one of these:
- Approving the work on behalf of building control
- Construction that lacks the fire resistance the seal relies on
- Deciding what a wall or floor needs, which belongs to the designer
Not sure which it is? You can call the office on 01277 525 020 or use the quote form and we’ll tell you honestly.
Surfaces we seal
- Joints between fire-resisting walls and floors
- Linear gaps at wall heads
- Pipe penetrations
- Service gaps in risers
- Cable penetrations
- Small duct penetrations where the tested detail allows
Questions we’re asked in Dollis Hill
Can you cope with the access rules in a London building?
Yes. Inductions, permits and timed loading are routine for us in London. Send the building rules and access times with your enquiry. The ULEZ covers the whole of Greater London, which we allow for
Would you work within a site like BMI Hendon Hospital?
Yes, healthcare and care buildings are part of our work. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.
When can the area be used after sealing?
The product and site conditions decide that. Some take light use quickly, others need longer to cure, so we will confirm the curing time on the day.
How long will the new sealant last?
It depends on movement, UV and weather, cleaning, traffic and the product. Sealant joints are maintenance items, so inspect them regularly.
Is the work guaranteed?
Yes. It runs for twelve months and covers how we prepared and sealed the joints, though not damage or work by other trades.
Are you insured?
Yes. We are fully insured, and the certificate can go with your quote.
Can you tell us what fire stopping our building needs?
No. Deciding what is needed sits with the designer, fire engineer and building control. Our role is installing what they specify, to the product’s tested detail.