Greater London · England
Highams Park External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Highams Park and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
How we handle external mastic in Highams Park
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. Common call-outs are for weathered mastic that no longer stretches and rigid filler in a joint that should flex, on copings & trims, concrete & block and brickwork movement joints.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Where
- Highams Park (E4, E17, IG8)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Aftercare tips
Good habits help new joints last longer. A few tips:
- Never let anyone fill a movement joint with mortar
- Have failed joints looked at early
- Ask before painting over external sealant
- Keep water from gutters off the wall
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead over time.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
Common questions in Highams Park
Can parking be tricky for a visit in Highams Park?
Parking in Highams Park, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do you cover Highams Park for external mastic?
Yes, Highams Park is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear price.
Where are you based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
How long does the job take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer.
Why is there a gap in my brick wall?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Can you seal joints between render and window frames?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
Will the old sealant be removed?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Do you need external mastic in Highams Park?
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
Any of these means the joints need attention:
- Gaps where render, brick and frames meet
- Panel joints letting water in
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
Rented homes near Highams Park station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Comparing quotes
- Who turns up on the day
- Is the old sealant removed completely?
- Whether the sealant suits the joint
- What the cure time is
Also near Highams Park
Also in Highams Park
External mastic in Highams Park: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Bruce Castle (about 2.6 miles west) nearby, there’s older building stock in the area around Highams Park as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
For site and facilities teams at buildings such as South Chingford Foundation School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you live in an older home near St John's, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Highams Park is about 1 mile south of Chingford, in Greater London. If you need external mastic in Highams Park, please call 0345 464 0079 or email us for a quick quote. We are based in Crawley and cover Greater London. Highams Park is one of 764 towns and villages in Greater London where we work. You can also see our page for London, roughly 8 miles from Highams Park.
Every address in E4, E17 and IG8 is covered for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on May Road, Adam Road and Cecil Road or anywhere close by, our applicators can take on the job. Neighbouring places we cover for external mastic include South Chingford (1 mile north-west), Hale End (1 mile east), Chingford Mount (1 mile north), Chingford Hatch (1 mile north-east) and Chingford (1 mile north). We also work in nearby towns such as London (8 miles south-west), City of Westminster (9 miles south-west), Marylebone (8 miles south-west), Kensington (11 miles south-west), St Pancras (7 miles south-west) and Shoreditch (6 miles south-west).
Around Highams Park
Around Highams Park, our work takes us to homes and buildings near The King's Ford pub, Lloyd Park and Selwyn Primary School and the streets around them. The nearest railway station is Highams Park station, roughly 0.7 miles east. Nearby you’ll also find Walthamstow Pump House Museum (2.2 miles south) and Wanstead Hospital (2.3 miles south-east). For a walk, there’s Highams Park Lake and Pole Hill.
How the visit works
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the job takes a few hours for a handful of joints, longer for a whole elevation for a typical 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 look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Move anything stored near the joints
- For business premises, tell us about site rules or sign-in
- Let us know if you’ve seen damp or leaks
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Advice
What sealant work can’t fix
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Structural movement, which needs a surveyor or engineer
- Cracks in the bricks or render themselves, away from the joints
- Failed render or damaged cladding panels
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
What we seal
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Façade panels
- Joints between brick and frames
What affects the quote in Highams Park
Your quote is based on your job. We look at:
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
- The amount of work
- How many rooms, windows or areas are involved
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 play a part, and we’ll explain the quote if you ask.
Asking for a quote
Before you ask for a quote, have a think about:
- Whether it has been sealed before
- The type of property
- Access, such as stairs, a lift or height
- Roughly how big the job is
For external mastic in Highams Park, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.