Mastic contractors in Friern Barnet
Construction mastic for Friern Barnet, from a contractor working since 2005. Fully insured and CHAS accredited.
- Old sealant on a refurbishment that needs stripping before new work
- Oversized or tapered gaps around new frames
- Sanitary sealant damaged by following trades
Construction mastic for businesses in Friern Barnet
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Maintenance after handover
Your facilities or cleaning team can help the joints last. Share these points with them:
- Put any product change through the designer first
- Keep finished joints away from paint, plaster and scrapers
- Don’t force external sealing on a damp or frosty day
- Get the mastic subcontractor involved early in the programme
After we have sealed an area, it helps to keep other trades from damaging the joints. Fresh sealant needs its cure time before it’s cleaned, painted near or knocked, and that time depends on the product, temperature and joint depth.
Oversized gaps are a problem better caught early. Filling a wide gap with sealant alone sets up a failure. We flag them as soon as we see them.
Construction mastic in Friern Barnet, done properly
The specification and the programme set the job rather than whatever product is to hand. If a product is named, that’s what goes in; any alternative we suggest is put to you before anything changes. Backing, primer and depth follow what the sealant maker sets out so the detail on the drawing is what ends up on site. If you have a long mastic snag list close to completion and cracks opening in caulked internal joints, we can help. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, in Friern Barnet it comes down to the same thing: failed joints cut out, faces prepared and the right sealant laid to the right depth.
A great deal of London construction is refurbishment of occupied or part-occupied buildings, alongside new blocks. New frames, overcladding and fit-outs all end in perimeter and facade joints, frequently with occupants close by, so tidy, well-planned work matters.
Our workmanship is guaranteed for 12 months. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Where
- Friern Barnet (N11, N12, N10, N20)
- Region
- Greater London
- Cover
- 12 months on every job
- Quote
- A fixed quote before we start
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
When to call us in Friern Barnet
Frames installed with uneven gaps make perimeter sealing harder. Sealant has a range of joint widths it can cope with. Better to raise it at the start than seal a joint that’s bound to fail.
What tends to prompt an enquiry:
- A mastic package split between trades with no clear owner
- Frame perimeters left unsealed or poorly sealed
- External joints sealed in damp or cold conditions that are now failing
- Frame gaps too wide for sealant alone
When a college such as Oak Hill College (to the north of Friern Barnet) builds or refurbishes, the mastic package normally has to fit around students and staff.
What to look for in a quote
- Their plan for phasing and protecting the area
- How the existing material will be dealt with
- Will CSCS-carded applicators be on site?
- What the guarantee covers, and for how long
Work for main contractors and building owners
Hotels, schools, healthcare sites, offices and retail units come to us directly as well. The work is planned around how the building runs, so the building keeps working while we do.
Blocks and communal areas make up much of the work for housing associations and agents. We phase the work so people keep access, with each stage agreed with your site contact.
General trades versus a specialist
Using site staff can make sense for a small touch-up, but anything bigger is another matter: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.
When it isn’t the sealant
We check first that sealant really is the fix. It isn’t the answer for:
- Faulty frames rather than failed sealant
- Designing joint widths or choosing the specification (that sits with the designer)
- Approving fire stopping as compliant
If in doubt, call 01277 525 020 or send photos by email and we will say what we think before you book.
Where we work in Friern Barnet
- Floor and skirting junctions
- Internal decorators’ caulk
- Brick and block movement joints
- Sanitary and kitchen joints
- Cladding and panel joints
- Window and door perimeters
Nearby places to Friern Barnet
Other services in Friern Barnet
Facades, frames and programmes in Friern Barnet
Site traffic in Friern Barnet falls within London’s ULEZ, like everywhere else in Greater London. Add booked deliveries and tight storage, and the mastic package needs planning with the site team. There are a good number of hotels within about 2 miles of Friern Barnet. Hotel schemes tend to have fixed reopening dates, so the mastic is programmed tightly with the other trades.
New wings at hospitals like Finchley Memorial Hospital (1.1 miles south-west of Friern Barnet) bring long runs of window and panel joints to seal. Work at a hotel such as National Hotel (1.5 miles south of Friern Barnet) tends to be programmed around bookings, mastic included.
Friern Barnet is about 2 miles north-east of Finchley, in Greater London. We send applicators to Friern Barnet for mastic packages. Across Greater London, 764 places are covered, Friern Barnet among them. London is covered too, around 8 miles from Friern Barnet.
Commercial sites across N11, N12, N10 and N20 are covered for mastic packages. If your site is on Martock Gardens, Shapwick Close and Radstock Close or close by, send details and we will quote for mastic packages. You will find Friern Barnet on or near the A406 and B550. Sites close to Friern Barnet are covered too, including New Southgate (1 mile east), Brunswick Park (1 mile north), North Finchley (1 mile west), Arnos Grove (1 mile east) and Whetstone (1 mile north-west). Further afield, our area takes in London (8 miles south), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (8 miles south), St Pancras (6 miles south) and Shoreditch (7 miles south-east).
Local landmarks in Friern Barnet
In Friern Barnet, that means premises near Francis Skaryna Belarusian Library and Museum, Friary Park and Friern Barnet School, among other places. Friern Barnet has its own railway station: New Southgate station. A little further out are Francis Skaryna Belarusian Library and Museum (1.4 miles west) and Grand Arcade (1 mile west). Open spaces near Friern Barnet include Highgate Hill and Darland's Lake.
Questions about Friern Barnet
Could you schedule work at a campus like American University in London for the vacation?
Yes. We plan campus work around teaching, exams and residence turnarounds. Let us know which documents your site asks for, and we will confirm them alongside the quote.
Do you cover business parks and estates near Friern Barnet, such as Friern Bridge Retail Park?
Yes, sites like Friern Bridge Retail Park are within our area, along with the rest of Friern Barnet. Photos and a short description are enough for a first look.
How much does the work cost?
There isn’t a price list, because every site is different. Send photos or drawings and we’ll price it at a fixed figure.
Do you install fire-rated sealant as part of a package?
Where the specification calls for fire-rated or intumescent sealant around service penetrations or linear gaps, we install it to the manufacturer’s tested details. Fire-stopping design and sign-off sit with the designer and building control.
What joints do you seal on a new build?
The scope comes from the specification and drawings, but frames, sanitary, kitchens, caulk where specified and snagging are typical.
Do you guarantee new-build sealant work?
It carries a 12-month guarantee on our workmanship. We are also fully insured for public liability.
Can you work to our specification?
We work to the specification and the manufacturer’s installation guidance. Primers, backing and joint depth follow what the manufacturer sets out.
From enquiry to sign-off
Working in a building that stays open takes some planning. We sign and contain the area we’re in, keep walkways clear and move on in phases so staff and visitors can carry on around us. In Friern Barnet, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- Drawings, specification and programme come to us.
- We take off quantities and return a fixed quote.
- We agree with the site team which areas come first.
- Plots or floors are sealed as they’re handed over.
- Joints are prepared, backed and sealed to the specification.
- After snagging, the work is handed over under our 12-month guarantee.
Preparing the site
- Clear stock, furniture or equipment away from the joints
- Tell us which areas need to stay in use
- Have the specification and drawings to hand
Request a quote
For a fixed quote, phone 01277 525 020 or email a schedule or drawings, telling us the site location and the nature of the job. You can also send details through our quote form.