Oxfordshire · England
External Mastic in Nuneham Courtenay
External mastic across Nuneham Courtenay and nearby, with old sealant always removed completely and a 12-month guarantee.
- Joints pointed up with cement by mistake
- Leaking joints around cladding and façade panels
- Old sealant gone brittle and cracked
External mastic for homes and businesses in Nuneham Courtenay
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, leaving it bonded to two faces so it can move with the wall. We work on render & cladding joints, brickwork movement joints and façade panels, and the jobs we see most are failed seals between different materials and sealant pulling away from one side of the joint.
Older homes in small places like Nuneham Courtenay may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water usually gets in, and they need the right sealant at the right depth.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Nuneham Courtenay (OX44)
- Region
- Oxfordshire
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Common problems we fix in Nuneham Courtenay
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
It’s worth asking for a quote if you see:
- Failed sealant between panels on a façade
- Failed seals between different materials
- Water getting into walls through failed joints
- Movement joints with cracked, split or missing sealant
Managing a site like Marsh Baldon Church of England Controlled School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- How hidden problems are handled
- What the quote includes, VAT included or not
- How the colour is chosen
- How long to leave it before use
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Also near Nuneham Courtenay
Also in Nuneham Courtenay
External mastic in Nuneham Courtenay: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Clifton Hampden Manor (about 2.3 miles south) nearby, there’s older building stock in the area around Nuneham Courtenay as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Homes close to Church of St Peter include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Letting a property close to Radley station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Nuneham Courtenay is about 4 miles east of Abingdon-on-Thames, in Oxfordshire. For external mastic in and around Nuneham Courtenay, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We are based in Crawley and cover Oxfordshire, Nuneham Courtenay included. We cover 443 towns and villages across Oxfordshire, large and small.
All of OX44 is covered for external mastic, from the main roads to the quietest streets. Neighbouring places we cover for external mastic include Radley (2 miles west), Clifton Hampden (2 miles south), Long Wittenham (3 miles south), Abingdon-on-Thames (4 miles west) and Culham (4 miles south-west). Further out, we also cover Oxford (4 miles north), Didcot (6 miles south), Bicester (15 miles north), Witney (14 miles north-west), Thame (11 miles east) and Wantage (12 miles south-west).
Around Nuneham Courtenay
Around Nuneham Courtenay, our work takes us to homes and buildings near The Oxford Academy. The nearest railway station is Radley station, roughly 1.7 miles west. Other landmarks nearby include FitzHarris Castle (3.7 miles west) and Littlemore Hospital (2.3 miles north-west). For a walk, there’s Shotover and Wells Farm.
Quotes for external mastic in Nuneham Courtenay
Jobs vary more than people expect. The main factors:
- When we can work, for business premises
- How much there is to do
- Whether there’s mould to deal with
- Which sealant suits the joint
Doing several joints on one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Pictures of the joints, sent by email
- How we’d reach the joints
- What’s wrong with the joints now
- Where the property is
We don’t publish a price list, because every job is different. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or drop us an email.
What the job involves on each surface
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. A primer goes on where the product requires one before sealing.
Landlord and commercial work in Nuneham Courtenay
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Aftercare tips
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Fix overflowing gutters above sealed joints
- Wash walls gently around the sealant
- Make sure movement joints are not pointed over
- Point out the joints to other trades
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
How the visit works
On the day, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before any work starts. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In a small place like Nuneham Courtenay, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
- For business premises, tell us about site rules or sign-in
Getting a quote
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
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Nuneham Courtenay questions
Will you come out to Nuneham Courtenay?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Radley station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Do you take out the old sealant first?
Yes, every time. New silicone does not stick to old silicone, so the joint is cleaned back first.
Where is Mr Mastic based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Should I point up the gap in my brickwork?
No. Cement or mortar cannot stretch and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
Will the new joint stand out?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. Exterior sealants come in a good range of colours.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Can you quote for more than one area?
Yes, we can. More than one area can be quoted together.