Oxfordshire · England
External Mastic in Duns Tew
Problem with your movement joints in Duns Tew? We remove the old material, prepare the joints and seal them properly.
- Sealant pulling away from one side of the joint
- Damp patches traced to an open external joint
- Leaking joints around cladding and façade panels
How we handle external mastic in Duns Tew
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we will confirm what’s needed to reach them safely. If you have joints pointed up with cement by mistake and weathered mastic that no longer stretches, we can help.
Older homes in small places like Duns Tew may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points.
There’s a 12-month guarantee on every job, large or small.
- Place
- Duns Tew (OX25)
- Region
- Oxfordshire
- Cover
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
When something else is needed
In fairness, there are a few things sealant will not fix:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Movement that is more than a sealant joint can take
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before booking.
What we seal
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Façade panels
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- How many areas need sealing
- Whether the work is at height
- Any working-time requirements on site
- Mould in or behind the old joints
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts.
Helping us quote
To help us quote quickly, let us know:
- Pictures of the joints, sent by email
- The address or postcode of the job
- Whether it’s a home or a business
- Any access issues, like height or stairs
For external mastic in Duns Tew, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
For anyone letting property in or around Duns Tew, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Tell anyone working on the walls about the movement joints
- Don’t let climbing plants root in the sealant
- Leave the joints unpainted unless we have said otherwise
- Never let anyone fill a movement joint with mortar
Do not let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
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, all bigger jobs than a reseal.
Outside joints around Duns Tew
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.
For landlords with property near Heyford station, outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as Church of St Mary Magdalene, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Duns Tew is about 8 miles south of Banbury, in Oxfordshire. Homes, rented property, offices and hotels in Duns Tew is covered for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Our area takes in 443 places across Oxfordshire, large and small. There’s also a page for Oxford, roughly 15 miles from Duns Tew.
Here we cover the OX25 postcode area for external mastic. You’ll find streets such as Main Street, Glebe Court and Middle Barton Road, and we cover them all. Other places close to Duns Tew include Dane Hill (1 mile north-east), North Aston (1 mile east), Middle Aston (1 mile south-east), Steeple Aston (2 miles south-east) and Nether Worton (2 miles west). We also work in nearby towns such as Oxford (15 miles south), Banbury (8 miles north), Bicester (8 miles south-east), Witney (13 miles south-west), Kidlington (9 miles south) and Headington Quarry (14 miles south-east).
What’s near Duns Tew
Around Duns Tew, our work takes us to homes and buildings near The White Horse Inn, among other places. The closest station to Duns Tew is Heyford station, about 2.8 miles south-east of the centre. A little further out are Old Forge Museum (Great Tew) (3.9 miles west) and Deddington Castle (2.1 miles north-east).
How the visit works
We bring everything the job needs with us. 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. For a village or hamlet like Duns Tew, 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 we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Keep pets and children clear of the area while we work
- Let us know if you’ve seen damp or leaks
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or drop us an email with the details, and pictures are welcome.
Related advice
Towns and villages near Duns Tew
More services for Duns Tew
How the job changes by surface
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.
Cladding and façade panels
If the façade has a specified sealant, that is what we use, or one the system allows. Tell us what the building has when you get in touch.
Common questions in Duns Tew
Do you cover Duns Tew for external mastic?
Yes. We work across London and the South East, and Duns Tew is part of that. Just call 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
Can you help a landlord with a rental near Heyford station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Do you work at height?
That depends on the building and the joints. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
How long before the joint can be used?
It depends on the product. We tell you how long to leave it before we go.
Are you insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Can new sealant go over the old?
No. The old sealant always comes out first.
Can you seal joints between render and window frames?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. We pick a colour that works with both materials.
Will the old sealant be removed?
Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.