Oxfordshire · England
External Mastic in Bunkers Hill
External mastic in Bunkers Hill from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints pointed up with cement by mistake
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
How we handle external mastic in Bunkers Hill
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two. Common call-outs are for failed sealant between panels on a façade and water getting into walls through failed joints, on façade panels, joints between brick and frames and brickwork movement joints.
Around Bunkers Hill, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water usually gets in, and they need the right sealant at the right depth.
Whatever the size of the job, you get the same one-year guarantee.
- Location
- Bunkers Hill (OX5)
- Wider area
- Oxfordshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Aftercare tips
A little care helps the new joints last. Our advice:
- Wash walls gently around the sealant
- Ask before painting over external sealant
- Never let anyone fill a movement joint with mortar
- Have failed joints looked at early
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Act while the splits are small. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
Other services in Bunkers Hill
Walls and rooflines in Bunkers Hill
Historic houses like Blenheim Palace (about 2.3 miles south-west) are a reminder that the area around Bunkers Hill 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Tackley station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. Schools such as Marlborough School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Bunkers Hill is about 7 miles south-west of Bicester, in Oxfordshire. Our applicators cover external mastic for homeowners, landlords and businesses in Bunkers Hill and nearby. Bunkers Hill is one of 443 towns and villages in Oxfordshire we cover. You can also see our page for Oxford, roughly 8 miles from Bunkers Hill.
Jobs for external mastic in OX5 works the same way as everywhere else we cover. That includes homes and businesses on Field View Lane and Bunkers Hill and the roads around them. Nearby, we also carry out external mastic in Shipton-on-Cherwell (1 mile south-east), Thrupp (1 mile south), Woodstock (2 miles south-west), Tackley (2 miles north) and Begbroke (2 miles south). We also work in nearby towns such as Oxford (8 miles south-east), Banbury (14 miles north), Bicester (7 miles north-east), Abingdon-on-Thames (13 miles south), Witney (9 miles south-west) and Carterton (13 miles south-west).
Near you in Bunkers Hill
Locally, jobs take us to homes and businesses close to Rock Of Gibraltar Public House. The closest station to Bunkers Hill is Tackley station, roughly 1.8 miles north-east. Nearby you’ll also find Soldiers of Oxfordshire Museum (2 miles west).
Bunkers Hill questions
I let a flat near Tackley station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners. You can phone 0345 464 0079 or email us with the details for a clear quote.
Do you cover Bunkers Hill for external mastic?
Yes, Bunkers Hill is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Can you reach joints on upper floors?
It depends on the building. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
Why do you put foam in the joint first?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Do the sealants smell?
There can be a smell while the sealant cures. Opening a window helps.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
What we’re called out for in Bunkers Hill
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
Any of these means the joints need attention:
- Panel joints letting water in
- Rigid filler in a joint that should flex
- Water getting into walls through failed joints
- Cracked joints where brick meets render or frames
Homes close to Church of Holy Cross include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
What to look for in a quote
- What product goes in the joint
- What insurance they hold
- Is VAT in the price?
- How hidden problems are handled
Honest limits
A few problems are outside what sealant work can do:
- Structural movement, which needs a surveyor or engineer
- Adding movement joints to masonry that has none
- Render that’s blown, hollow or coming away
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Copings & trims
- Façade panels
What affects the quote in Bunkers Hill
We quote each job individually. This is what makes a difference:
- How much old sealant there is and how hard it is to remove
- Whether there’s mould to deal with
- Working hours on commercial sites
- How easy the joints are to reach
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
What we need to know
What to tell us when you ask for a quote:
- A few pictures by email, if you can
- How we’d reach the joints
- Any previous sealing or DIY work
- Where the property is
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
For landlords and businesses
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
For anyone letting property in or around Bunkers Hill, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
Why act early in Bunkers Hill
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. Where a wall is exposed, as many are in small places like Bunkers Hill, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
Why choose Mr Mastic in Bunkers Hill
- Homes, businesses and hotels
- Colour picked to suit the job
- We agree the colour with you first
- Over 20 years’ experience
The process
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Bunkers Hill, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- 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.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
Getting a quote
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before work begins.