Greater London · England
External & façade joints in Middle Park, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for Middle Park, backed by a 12-month guarantee. Call for a quick quote.
- Water getting into walls through failed joints
- Gaps where render, brick and frames meet
- Joints with sealant missing in places
FAQs for Middle Park
Do you cover Middle Park for external mastic?
Yes. Our work covers London and the South East, and Middle Park is part of that. Just call 0345 464 0079 or email us with a few details of the job.
I let a flat near Mottingham station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or email us with the details for a clear quote.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint can’t move, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Is there a guarantee?
Yes, always. Each job is guaranteed for twelve months, large or small.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and we’ll quote it together.
External mastic in Middle 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, so it bonds to the two sides only and can stretch. If you are dealing with gaps where render, brick and frames meet and joints with sealant missing in places, we can help, whatever the surface.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. In Middle Park, joints up high may need ladders or other access, which is worth talking through when you book.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Middle Park (SE9, SE12)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
The process
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours for a handful of joints, longer for a whole elevation. For a job in Middle Park, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Move anything stored near the joints
- Try not to wet indoor joints just before the visit
Ask for a quote
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or email us with the details, and photos are welcome.
Read more
What we are called out for in Middle Park
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
Any of these means the joints need attention:
- Plants rooting in failed movement joints
- Old sealant gone brittle and cracked
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
Managing a site like Middle Park Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before you book
- Whether all the old sealant comes out first
- When the joint can take water or movement
- Who does the work, and how experienced they are
- Are they insured?
External mastic in Middle Park: local notes
With historic houses such as Eltham Palace (about 0.4 miles east) nearby, there’s older building stock in the area around Middle Park as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
Homes close to Church of St Saviour include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. Rented homes near Mottingham station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Middle Park is about 1 mile west of Eltham, in Greater London. We provide external mastic to householders, landlords and businesses in Middle Park and the surrounding area, as part of our work across Greater London. 764 places in Greater London are on our list. For nearby work, see our London page (7 miles or so).
All of SE9 and SE12 is within our area for external mastic, from the main roads to the quietest streets. External mastic is available to properties on Horsa Road, Court Road and Sidcup Road. You’ll find Middle Park on the A20, which makes it straightforward to reach. We also cover Horn Park (1 mile west), Eltham (1 mile east), Mottingham (1 mile south), Well Hall (1 mile north-east) and Chinbrook (1 mile south). Further out, we also cover London (7 miles north-west), City of Westminster (10 miles north-west), Marylebone (9 miles north-west), Kensington (11 miles west), St Pancras (9 miles north-west) and Shoreditch (8 miles north-west).
Around Middle Park
Around Middle Park, our work takes us to homes and buildings near Harris Academy Greenwich, Horn Park and The Banker's Draft pub and the streets around them. Middle Park’s nearest station is Mottingham station, roughly 0.5 miles south-east. Well-known places in the area include Greenwich Castle (2.9 miles north-west) and Prefab Museum (1.9 miles west). The countryside around Middle Park includes Summer Hill and The Tarn.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
For anyone letting property in or around Middle Park, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
When something else is needed
It helps to know what we cannot do:
- Adding movement joints to masonry that has none
- Subsidence or other structural problems
- Cracks in the bricks or render themselves, away from the joints
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
- Concrete & block
- Render & cladding joints
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way and it means sorting access once. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Middle Park.
The cost depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Why us?
- Fully insured
- Tidy, careful work
- An ARBOMaster approved applicator
- Every job guaranteed for a year
Take a look at how sealant jobs are priced or what customers say.