Oxfordshire · England
External Mastic in Coscote
We cover Coscote for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Failed sealant between panels on a façade
- Damp patches traced to an open external joint
- Gaps where render, brick and frames meet
External mastic in Coscote
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a matching colour. If you’re dealing with brick movement joints where the sealant has split and moss and dirt in joints with no sealant left, we can put it right, on brickwork movement joints, concrete & block and render & cladding joints alike.
Outside joints can only be sealed when they’re dry, so work in Coscote is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
All of our work is guaranteed for twelve months, in Coscote and everywhere else we cover.
- Place
- Coscote (OX11)
- Wider area
- Oxfordshire
- Cover
- One year on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in Coscote
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Housing providers, facilities teams and property managers book us too in Coscote and across Oxfordshire. We can quote a run of properties together, and we’re fully insured for the work.
Leave it or put it right?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost around the joint, so the damage spreads beyond the joint. Where a wall is exposed, as many are in small places like Coscote, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why book with us
- A 12-month guarantee on all work
- Quality sealants from Arbo and Everbuild
- Tidy, careful work
- White, clear, grey or coloured to suit, where the product allows
Take a look at what affects the cost and what customers say.
What external mastic looks like in Coscote
Historic houses like Brightwell Manor (about 4.1 miles east) are a reminder that the area around Coscote has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as Hagbourne Church of England Primary School, its movement joints, gutters and trims need looking after like any other building’s. Homes close to Church of St Andrew include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Coscote is about 1 mile south of Didcot, in Oxfordshire. Wherever you are in the OX11 postcode area, our applicators can take on external mastic. Coscote is one of 443 places in Oxfordshire where we work. You can also see our page for Oxford, about 11 miles away.
We work across OX11 for external mastic and the streets around it. Neighbouring places we cover for external mastic include West Hagbourne (1 mile south-west), East Hagbourne (1 mile east), Upton (1 mile south), Harwell (2 miles west) and Blewbury (2 miles south-east). Within a short drive, we also cover Oxford (11 miles north), Abingdon-on-Thames (6 miles north), Wantage (7 miles west), Grove (7 miles west), Faringdon (15 miles west) and Benson (7 miles east).
Near you in Coscote
Around Coscote, our work takes us to homes and buildings near UTC Oxfordshire, Fleur De Lys Public House and St Birinus School. Coscote’s nearest station is Didcot Parkway station, about 1.5 miles north of the centre. Nearby you will also find Brightwell Castle (4.1 miles east) and Atlas Computer Laboratory (2.8 miles south-west). Open spaces near Coscote include Mowbray Fields and Churn Hill.
FAQs for Coscote
Is Coscote within the area you cover?
Yes, Coscote is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
I let a flat near Didcot Parkway station. Can you help?
Yes. We work for landlords and agents as well as homeowners. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
What is backing rod for?
That’s backing rod, a closed-cell foam. It stops the sealant going in too deep and bonding to three sides.
Is it OK to fill a movement joint with cement?
No. Rigid materials can’t move with the wall. If it has already been filled, we can generally cut it out and reseal it.
Can I add another job to the visit?
Yes. Just list everything you need and you’ll get one quote.
Why is there a gap in my brick wall?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Should I try DIY first?
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.
Places near Coscote
Other services in Coscote
How it works
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take anything from a few hours to several days, depending on the building. For a village or hamlet like Coscote, 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.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
How to get a quote
For a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear quote before any work starts.
Read more
Signs you need external mastic in Coscote
Some movement joints have been pointed up with mortar. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
The most common problems we see are:
- Brick movement joints where the sealant has split
- Sealant that has lost its bond to the brick or render
- Weeds or debris growing in open joints
- Movement joints filled with mortar instead of sealant
If you let a flat or house near Didcot Parkway station, split movement joints are easy to miss on a rental until damp shows inside.
Comparing quotes
- How the colour is chosen
- What the quote includes, VAT included or not
- How hidden problems are handled
- When the joint can take water or movement
How the job changes by surface
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. We reseal them with an exterior sealant suited to the material.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Make sure movement joints aren’t pointed over
- Fix overflowing gutters above sealed joints
- Walk round the building once a year and look at the joints
- Leave the joints unpainted unless we have said otherwise
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead over time.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.