Hampshire · England
Exton External Mastic
We cover Exton for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Failed seals between different materials
- Joints with sealant missing in places
- Panel joints letting water in
About our external mastic in Exton
For buildings in Exton, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. We’re often asked to deal with movement joints with cracked, split or missing sealant and joints where the bead has come unstuck, on render & cladding joints, concrete & block and façade panels.
Outside joints can only be sealed when they’re dry, so work in Exton 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 there’s a problem with it, please ring 0345 464 0079 or email us.
- Place
- Exton (SO32)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Exton
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Most people get in touch after spotting something like this:
- Joints with sealant missing in places
- Old sealant gone brittle and cracked
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
For an older house near a landmark such as Church of St Peter and St Paul, an extension built onto an older house moves differently, and the joint between them takes the strain.
Comparing quotes
- The length of the guarantee
- Is the old sealant removed completely?
- What product goes in the joint
- What happens if the job turns out different
What happens on the day
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself usually takes a few hours for a handful of joints, longer for a whole elevation, depending on the size of the job. For a village or hamlet like Exton, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any previous sealing or DIY attempts
- Tell us if parking is tricky
Get a quote
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or email us with the details.
Advice
What the job involves on each surface
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best year round.
Render joints
Render has movement joints and stop beads that need sealing. We reseal them with a flexible exterior sealant that suits the render colour.
Common questions in Exton
What guarantee comes with external mastic in Exton?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Will you come out to Exton?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you seal joints between two different materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
Do you remove the old sealant?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Do you work for letting agents?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
Can I do it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
What is backing rod for?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Nearby places to Exton
Other services in Exton
Quotes for external mastic in Exton
Every job gets its own quote. This is what makes a difference:
- Any mould that needs treating
- The type of sealant required
- Any working-time requirements on site
- The number and length of the joints
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
Helping us quote
To make quoting easier, let us know:
- Photos by email, if that is easy
- Where the property is
- The type of property
- Any access issues, like height or stairs
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand, and we’ll take it from there.
Honest limits
A few problems are outside what sealant work can do:
- Damp that is not coming from the joint
- Failed render or damaged cladding panels
- Walls that need new movement joints cut into them
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Where we work in Exton
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
- Copings & trims
- Render & cladding joints
- Concrete & block
Outside joints around Exton
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Hinton Ampner House (about 4.2 miles north) are a reminder that the area around Exton has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
For site and facilities teams at buildings such as Meonstoke Church of England Infant School, its movement joints, gutters and trims need looking after like any other building’s.
Exton is about 7 miles north-west of Horndean, in Hampshire. Our applicators cover external mastic for homes and businesses in Exton, as part of our work across Hampshire. Across Hampshire, we cover 683 places, Exton among them. We also work in Southampton, about 12 miles from Exton.
Every address in SO32 is covered for external mastic, from the main roads to the quietest streets. That includes homes and businesses on Shoe Lane, Church Lane and Beacon Hill Lane. If you’re just outside Exton, we cover Corhampton (1 mile south), Meonstoke (1 mile south), Brockbridge (1 mile south), Droxford (2 miles south) and Soberton (3 miles south). We also work in nearby towns such as Winchester (10 miles north-west), Gosport (12 miles south), Havant (10 miles south-east), Eastleigh (10 miles west), Fareham (10 miles south) and Horndean (7 miles south-east).
Near you in Exton
We work in homes and buildings around The Shoe Inn. Not far away are St Clair's Meadow and Beacon Hill.
Why act early in Exton
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. Older cottages and farmhouses around Exton can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Why choose Mr Mastic in Exton
- Tidy, careful work
- We are fully insured
- Sanitary silicone with an anti-fungal additive in wet areas
- Trusted Arbo and Everbuild sealants
Take a look at our cost guide or customer reviews.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.