Hampshire · England
Downton External Mastic
Movement joints in Downton need attention? We remove the old material, prepare the joints and seal them properly.
- Weathered mastic that no longer stretches
- Plants rooting in failed movement joints
- Leaking joints around cladding and façade panels
Why act early in Downton
Water gets in through a failed movement joint, behind render and cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. Around Downton, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear price for the lot.
Why us?
- Sealant colour chosen to suit
- An ARBOMaster approved applicator
- Tidy, careful work
- Rated 4.9 stars on Google
See our cost guide and what customers say.
How we handle external mastic in Downton
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We take the old material out and do it properly. If you have movement joints with cracked, split or missing sealant and sealant that has lost its bond to the brick or render, we can help, on joints between brick and frames, copings & trims and façade panels alike.
Outside joints can only be sealed when they’re dry, so work in Downton is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or email us.
- Place
- Downton (SO41)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Clear growth from the base of walls and joints
- Walk round the building once a year and look at the joints
- Keep water from gutters off the wall
- Ask before painting over external sealant
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Downton buildings and the weather
Downton is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of All Saints, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Schools such as Hordle CofE (VA) Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Downton is about 3 miles west of Lymington, in Hampshire. Wherever you are in the SO41 postcode area, we cover external mastic for homes and businesses. Downton is one of 683 places in Hampshire we cover for external mastic. Southampton is on our list too, around 16 miles away.
Every address in SO41 is within our area for external mastic. If you need external mastic at a property on Hordle Lane and Shorefield Road or anywhere close by, we can help. If you are just outside Downton, we cover Leagreen (1 mile east), Hordle (1 mile north), Ashley (2 miles north-west), Barton on Sea (2 miles west) and New Milton (2 miles north-west). We also work in nearby towns such as Totton (13 miles north), Lymington (3 miles east), Hythe (13 miles north-east), Ringwood (10 miles north-west), Dibden Purlieu (12 miles north-east) and Marchwood (13 miles north-east).
Local landmarks in Downton
Typical jobs here are in homes near The Arnewood School, among other places. The closest station to Downton is New Milton station, about 2 miles north-west. Well-known places in the area include Lymington New Forest Hospital (3.7 miles north-east) and Sammy Miller Motorcycle Museum (2.9 miles north-west). The countryside around Downton includes Milford on Sea LNR.
Also near Downton
Also in Downton
When it is not the sealant
A few problems are outside what sealant work can do:
- Cracking across the wall rather than at a joint
- Loose or hollow render, which needs re-rendering
- Rising or penetrating damp from elsewhere in the wall
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before you book.
What we seal
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Copings & trims
What we are called out for in Downton
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Signs it’s time to call us include:
- Weathered mastic that no longer stretches
- Plants rooting in failed movement joints
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
For landlords with property near New Milton station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Questions to ask before you book
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
- How the joint is cleaned and prepared
- Whether the sealant suits the joint
Work for landlords, hotels and businesses
Landlords and agents in Downton can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
How we quote for external mastic
You’ll get a clear quote before work begins. It’s based on:
- When we can work, for business premises
- How many areas need sealing
- Access and height
- The product the joint needs
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What we need to know
What to tell us when you ask for a quote:
- Photos by email, if that’s easy
- The address or postcode of the job
- How we’d reach the joints
- What’s wrong with the joints now
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, ring 0345 464 0079 or send us an email.
Downton questions
I let a flat near New Milton station. Can you help?
Yes, we work for landlords and agents. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Will you come out to Downton?
Yes. Downton is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Will the old sealant be removed?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking and needs a flexible seal, not mortar.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
How do you reach high-level joints?
It depends on the building. Send us photos and a rough idea of the height, and we’ll confirm what access is needed.
How the visit works
The work is kept neat and contained to the joints we’re treating. The job normally takes anything from a few hours to several days, depending on the building. For a village or hamlet like Downton, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
Get a quote
If you’re in Downton and need external mastic, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.