Oxfordshire · England
External Mastic in Charndon
Our applicators work in Charndon on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Weeds or debris growing in open joints
- Cracked joints where brick meets render or frames
- Failed sealant between panels on a façade
External mastic in Charndon
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. We work on façade panels, concrete & block and joints between brick and frames, and people most often call us about old sealant gone brittle and cracked and gaps where render, brick and frames meet.
Older homes in small places like Charndon may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, 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.
- Where
- Charndon (OX27)
- Wider area
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Charndon
Is external mastic in Charndon guaranteed?
All our work, in Charndon and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Is Charndon in your area for external mastic?
Yes, Charndon is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back.
Can you match the colour of my brickwork?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so the joint doesn’t draw the eye.
DIY versus a professional finish
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
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.
What happens if it’s left?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and does not last. In a small place like Charndon, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
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.
Why us?
- Anti-fungal sanitary silicone in wet areas
- Approved under the ARBOMaster scheme
- White, clear, grey or another colour, product permitting
- We’re fully insured
Surface by surface
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two.
Towns and villages near Charndon
What else we do in Charndon
How the visit works
The work is kept neat and contained to the joints we are treating, so you can get on with your day. Expect the work to take anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. Somewhere like Charndon needs a little journey planning: 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.
- 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.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
If you’re in Charndon and need external mastic, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Read more
Charndon buildings and the weather
With historic houses such as Claydon House (about 3 miles east) nearby, there’s older building stock in the area around Charndon as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near Church of St Michael, an extension built onto an older house moves differently, and the joint between them takes the strain.
Charndon is about 6 miles east of Bicester, in Oxfordshire. Homes, rented property, offices and hotels in Charndon is covered for external mastic. Every job comes with our one-year guarantee. Charndon is one of 443 places in Oxfordshire we cover. We also work in Oxford, about 14 miles from Charndon.
Jobs for external mastic in OX27 works the same way as everywhere else we cover. We cover properties on Main Street, Spencer Gardens and Wootton Green and the roads around them. Other places close to Charndon include Calvert (1 mile east), Twyford (1 mile north), Poundon (2 miles north-west), Marsh Gibbon (2 miles south-west) and Hillesden (3 miles north). Larger places within reach include Oxford (14 miles south-west), Bicester (6 miles west), Thame (12 miles south), Kidlington (13 miles south-west), Headington Quarry (13 miles south-west) and Bure Park (6 miles west).
Local landmarks in Charndon
Other landmarks nearby include Bicester Community Hospital (5.9 miles west). For a walk, there’s Calvert Jubilee.
Honest limits
New sealant can’t fix everything, and we will tell you before we start. Sealant will not put right:
- Cracks in the bricks or render themselves, away from the joints
- Failed render or damaged cladding panels
- Structural movement, which needs a surveyor or engineer
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think before you book.
What we seal
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Façade panels
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
When to call us in Charndon
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. The joint can’t move, so the wall cracks somewhere else instead.
Look out for any of the following:
- Weeds or debris growing in open joints
- Weathered mastic that no longer stretches
- Movement joints with cracked, split or missing sealant
- Cracked joints where brick meets render or frames
In and around Charndon, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- When the joint can take water or movement
- What preparation is included
- Which colour the sealant will be
- Which sealant they’ll use, and why