Oxfordshire · England
External & façade joints in Cothill, Oxfordshire
Specialist external mastic for Cothill: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Hard, crazed mastic that has stopped moving
- Movement joints filled with mortar instead of sealant
- Panel joints letting water in
Leave it or put it right?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render around the joint, so the damage spreads beyond the joint. Around Cothill, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
Why us?
- Colour picked to suit the job
- Over 20 years’ experience
- A 12-month guarantee on all work
- Neat joints and a tidy finish
External mastic in Cothill, done properly
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where a rigid filler would soon crack. If you have failed sealant between panels on a façade and brick movement joints where the sealant has split, we can put it right.
Around Cothill, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Cothill (OX13)
- Region
- Oxfordshire
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Also in Cothill
Cothill: your questions answered
Is Cothill in your area for external mastic?
Yes, Cothill is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Can you help a landlord with a rental near Radley station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that usually means someone at home.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we are fully insured too.
Are you fully insured?
Yes. We’re fully insured for domestic and commercial work.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Signs you need external mastic in Cothill
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Keep an eye out for these signs:
- Sealant pulling away from one side of the joint
- Old sealant gone brittle and cracked
- Brick movement joints where the sealant has split
- Joints pointed up with cement by mistake
Schools such as Dry Sandford Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- When the joint can take water or movement
- What product goes in the joint
- Is the old sealant removed completely?
- Who does the work, and how experienced they are
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together.
How it works
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to several days, depending on the building. Somewhere as small as Cothill, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Tell us about any water getting in
- For indoor joints, keep the area dry beforehand if you can
- Plan for the work area to be out of bounds to pets and children
Getting a quote
For external mastic in Cothill, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
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What external mastic looks like in Cothill
Historic houses like Appleton Manor (about 1.8 miles north-west) are a reminder that the area around Cothill 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. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to Church of St Helen include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Rented homes near Radley station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Cothill is about 2 miles north-west of Abingdon-on-Thames, in Oxfordshire. Across the OX13 area, we cover external mastic for homes and businesses. Our area takes in 443 places across Oxfordshire, from the larger towns to small villages. Oxford is on our list too, about 6 miles from Cothill.
Work in OX13 is quoted and booked the same way as anywhere else. Neighbouring places we cover for external mastic include Dry Sandford (1 mile north-east), Shippon (1 mile south-east), Frilford Heath (1 mile south-west), Tubney (2 miles west) and Marcham (2 miles south). We also work in nearby towns such as Oxford (6 miles north-east), Didcot (7 miles south-east), Witney (10 miles north-west), Carterton (12 miles north-west), Wantage (8 miles south-west) and Grove (7 miles south-west).
What’s near Cothill
We work in homes and buildings around Merry Miller pub and Larkmead School. For rail, the closest station is Radley station, about 3.9 miles east. A little further out are Abingdon Community Hospital (2 miles south-east) and FitzHarris Castle (2.4 miles south-east). The countryside around Cothill includes Cumnor Hill and Dry Sandford Pit.
What we cannot put right
We’d rather tell you now than do work that won’t last, so these are the limits:
- Adding movement joints to masonry that has none
- Rising or penetrating damp from elsewhere in the wall
- Cracked brickwork or render that needs a builder or plasterer
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Copings & trims
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
What affects the cost of external mastic
Your quote is based on your job. We take into account:
- Working hours on commercial sites
- How much old sealant there is and how hard it is to remove
- How easy the joints are to reach
- Mould in or behind the old joints
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Asking for a quote
When you contact us, it’s useful to know:
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- Whether it has been sealed before
- How we’d reach the joints
For a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. You’ll have a clear quote before work begins.