Greater London · England
External & façade joints in Vale of Health, Greater London
Specialist external mastic for Vale of Health: careful preparation, the right product and tidy work. Call for a quick quote.
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
- Rain getting behind render or cladding at a joint
External mastic for homes and businesses in Vale of Health
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. We’re often asked to deal with plants rooting in failed movement joints and cracked joints where brick meets render or frames, across copings & trims, brickwork movement joints and joints between brick and frames.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in Vale of Health, tell us how high the joints are and how to reach the back of the building.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Vale of Health (NW3)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Vale of Health
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll quote.
Your questions about external mastic in Vale of Health
Can you help a landlord with a rental near Hampstead Heath station?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Is parking an issue for external mastic in Vale of Health?
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.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We will talk through colour options before work begins from the range available.
Can you seal over the old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding, so the joint can move.
Can you do several jobs on one visit?
Yes, we can. More than one area can go on one quote.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we’re using and why.
Should I point up the gap in my brickwork?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose, and the wall may crack nearby. We’ll reseal it with a flexible sealant.
Different surfaces, different methods
Copings and trims
Coping and trim joints face rain and sun head on. Each is resealed with a weatherproof, flexible sealant.
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
Why it’s worth doing now in Vale of Health
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why book with us
- One-year guarantee on every job
- ARBOMaster approved applicator
- Arbo and Everbuild products
- Fully insured
Read what affects the cost and customer reviews.
Vale of Health buildings and the weather
With historic houses such as Heath House (about 0.1 miles west) nearby, there’s older building stock in the area around Vale of Health as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Hampstead Heath station, split movement joints are easy to miss on a rental until damp shows inside. Vale of Health is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Vale of Health is about 1 mile north of Greenhill, in Greater London. Every kind of property in Vale of Health is covered for external mastic. The work is guaranteed for a year. Across Greater London, we cover 764 places, and Vale of Health is one of them. You can also see our page for London, about 6 miles away.
We work across the NW3 postcode area for external mastic. Streets in the area include Well Road, Cannon Lane and Holford Road, and we cover them all. Main roads around Vale of Health include the A502. We also cover North End (1 mile north-west), Greenhill (1 mile south), Hampstead (1 mile south), West Hampstead (1 mile south-west) and Childs Hill (1 mile west). Within a short drive, we also cover London (6 miles south-east), City of Westminster (3 miles south), Marylebone (3 miles south), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles south-east).
Around Vale of Health
We work in homes and buildings around St Vedasts School For Boys, South Hampstead High School and Hampstead Heath and the streets around them. For rail, the closest station is Hampstead Heath station, roughly 0.7 miles south-east. Well-known places in the area include New End Hospital (under half a mile south) and Montfichet's Tower (4.7 miles south-east). Open spaces near Vale of Health include Parliament Hill and Turner's Wood.
Also near Vale of Health
Other services in Vale of Health
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the size of the job. For a job in Vale of Health, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
How to get a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work and send you a clear quote.
Advice
Signs you need external mastic in Vale of Health
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
The most common problems we see are:
- Hard, crazed mastic that has stopped moving
- Movement joints filled with mortar instead of sealant
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
Homes close to Christ Church include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before booking anyone
- Is VAT in the price?
- What guarantee comes with the work
- How hidden problems are handled
- Whether all the old sealant comes out first
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Ask before painting over external sealant
- Make sure movement joints aren’t pointed over
- Avoid pressure-washing directly into sealant joints
- Act on the first splits you see
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
Act while the splits are small. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
Honest limits
A few problems are outside what sealant work can do:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Structural movement, which needs a surveyor or engineer
- Render that’s blown, hollow or coming away
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Surfaces we seal
- Façade panels
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints