Hampshire · England
External Mastic in South Down
Sealing brickwork movement joints, render, cladding and façade joints in South Down, with a one-year guarantee on every job. Call for a quick quote.
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
South Down buildings and the weather
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of All Saints include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. For landlords with property near Shawford station, split movement joints are easy to miss on a rental until damp shows inside.
South Down is about 3 miles north-east of Chandler's Ford, in Hampshire. Whether you are in the middle of South Down or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. South Down is one of 683 towns and villages in Hampshire where we work. We also work in Southampton, around 7 miles away.
Here we cover the SO21 postcode area for external mastic. Whether your property is on Cross Way, Fairfield Road and Grove Road or anywhere close by, our applicators can take on the job. We also cover Compton (1 mile north), Otterbourne (1 mile south-west), Shawford (1 mile north-east), Twyford (1 mile east) and Oliver's Battery (2 miles north). Larger places within reach include Winchester (3 miles north), Eastleigh (3 miles south), Fareham (13 miles south-east), Andover (15 miles north-west), Totton (10 miles south-west) and Chandler's Ford (3 miles south-west).
What’s near South Down
In South Down, that means homes and buildings near The Bridge Inn and Thornden School, among other places. The nearest railway station is Shawford station, roughly 0.6 miles north-east of the centre. A little further out are Balfour Museum of Hampshire Red Cross History (2.9 miles north) and Wolvesey Castle (3.2 miles north). For a walk, there’s Twyford Down and Shawford Down.
About our external mastic in South Down
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. Typical jobs include plants rooting in failed movement joints and joints with sealant missing in places, across joints between brick and frames, render & cladding joints and brickwork movement joints.
Outside joints can only be sealed when they’re dry, so work in South Down is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
We stand behind the work with a 12-month guarantee.
- Where
- South Down (SO21)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
It helps to know what we can’t do too:
- Loose or hollow render, which needs re-rendering
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracked brickwork or render that needs a builder or plasterer
If you are not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer before you book.
Surfaces we seal
- Joints between brick and frames
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Façade panels
- Render & cladding joints
What we do, step by step
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. It normally takes anything from a few hours to several days, depending on the building. In a small place like South Down, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Let us know if you’ve seen damp or leaks
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
Ask for a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work and send you a clear quote.
Advice
Quotes for external mastic in South Down
Every job gets its own quote. These are the things that affect it:
- Whether old sealant or filler has to be cut out
- Any mould that needs treating
- The product the joint needs
- When we can work, for business premises
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Helping us quote
To help us quote quickly, let us know:
- Photos by email, if that’s easy
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
Want a quote for external mastic? Please phone 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Towns and villages near South Down
What else we do in South Down
Questions from South Down
Do you cover South Down for external mastic?
Yes. Our work covers London and the South East, and South Down is part of that. Just call 0345 464 0079 or email us with a few details of the job.
Can you help a landlord with a rental near Shawford station?
Yes. We work for landlords and agents as well as homeowners. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Can you quote for more than one area?
Yes. Just list everything you need.
How much does external mastic cost in South Down?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Can you seal joints between two different materials?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides.
How long should I leave it?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used before we leave.
What do you put in the joint?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we’re using.
Are you insured?
Yes. Full insurance covers our work.
What we are called out for in South Down
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, and it tears off the sides.
It’s worth asking for a quote if you see:
- Panel joints letting water in
- Cracked joints where brick meets render or frames
- Moss and dirt in joints with no sealant left
- Damp patches traced to an open external joint
For site and facilities teams at buildings such as Twyford St Mary's Church of England Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- Which colour the sealant will be
- Which sealant they’ll use, and why
- What guarantee comes with the work
- How much experience the applicator has
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
If you manage several properties in or around South Down, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
How to look after the new joints
Looking after new joints is easy:
- Deal with leaking gutters that soak the joints below
- Do not let climbing plants root in the sealant
- Make sure movement joints aren’t pointed over
- Show decorators and builders where the movement joints are
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
Why deal with it now?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. Around South Down, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
What you get with us
- Tidy, careful work
- We’re fully insured
- 20+ years of sealant experience
- 180+ five-star Google reviews
Take a look at what affects the cost or what customers say.