Greater London · England
Fortune Green External Mastic
Specialist external mastic for Fortune Green: careful preparation, the right product and tidy work. Call for a quick quote.
- Rain getting behind render or cladding at a joint
- Plants rooting in failed movement joints
- Leaking joints around cladding and façade panels
About our external mastic in Fortune Green
For buildings in Fortune Green, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean joint faces and the right depth. If you have old sealant gone brittle and cracked and weeds or debris growing in open joints, we can put it right, on brickwork movement joints, concrete & block and render & cladding joints alike.
Modern London flats rely on sealed movement joints and cladding joints. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
Your job is guaranteed for a year, as with all our work.
- Location
- Fortune Green (NW3, NW6, NW2)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When it is not the sealant
Sealant isn’t the answer to every problem, and we’d rather say so up front. It won’t solve:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracking across the wall rather than at a joint
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before booking.
Joints and surfaces we work on
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Copings & trims
Also near Fortune Green
What else we do in Fortune Green
Fortune Green: your questions answered
Can you help a landlord with a rental near West Hampstead Thameslink station?
Yes. We work for landlords and letting agents as well as homeowners. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Can parking be tricky for a visit in Fortune Green?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can you do several jobs on one visit?
Yes. Just list everything you need and we’ll quote it together.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Which products do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you work in Fortune Green?
Yes, we do. Fortune Green is part of the area we cover.
Do the sealants smell?
There can be a smell while the sealant cures. Ventilation helps.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding.
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself generally takes anything from a few hours to several days, depending on the building, depending on the size of the job. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Mention if the joints have been sealed before
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we’ll talk you through the work.
Read more
Landlord and commercial work in Fortune Green
We work for letting agents and landlords as well as homeowners. Sealant work between tenants keeps a property looking cared for.
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Do you need external mastic in Fortune Green?
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
People generally contact us when they notice one of these:
- Sealant that has lost its bond to the brick or render
- Damp patches traced to an open external joint
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
For an older house near a landmark such as Church of St Luke, an extension built onto an older house moves differently, and the joint between them takes the strain.
Questions to ask before you book
- What insurance they hold
- Whether the sealant suits the joint
- Is the old sealant removed completely?
- What the cure time is
What happens if it’s left?
Water gets in through a failed movement joint and can run behind render or cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
What you get with us
- We are fully insured
- One-year guarantee on every job
- We leave the area clean and tidy
- Experience in homes, commercial sites and hotels
See what affects the cost or our reviews.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Avoid pressure-washing directly into sealant joints
- Deal with leaking gutters that soak the joints below
- Clear growth from the base of walls and joints
- Get split or bare joints resealed while the damage is small
Keep pressure washers away from the sealant. High-pressure water can lift the edges.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.
External mastic in Fortune Green: local notes
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as St Luke's Church of England School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near West Hampstead Thameslink station, outside joints that have cracked can let damp into a rental, so check them between lets.
Fortune Green is about 1 mile west of Hampstead, in Greater London. Homes, rented property, offices and hotels in Fortune Green can book us for external mastic, old or new, large or small. The work is guaranteed for a year. Across Greater London, we cover 764 places, Fortune Green among them. There’s also a page for London, about 6 miles away.
Our applicators cover all of NW3, NW6 and NW2 for external mastic. Local streets include Mill Lane, Ajax Road and Sarre Road. If you are just outside Fortune Green, we cover West Hampstead (1 mile east), Childs Hill (1 mile north), Hampstead (1 mile east), Greenhill (1 mile east) and Vale of Health (1 mile north-east). Within a short drive, we also cover London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles east).
Local landmarks in Fortune Green
In Fortune Green, that means homes and buildings near Holly Bush pub, St Vedasts School For Boys and Kilburn Grange Park, among other places. For rail, the closest station is West Hampstead Thameslink station, roughly 0.5 miles south of the centre. Well-known places in the area include Montfichet's Tower (4.9 miles south-east) and O2 Centre (0.8 miles south-east). For a walk, there’s The Long Water and Westbere Copse.