Oxfordshire · England
External & façade joints in Blewbury, Oxfordshire
External mastic for Blewbury, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Rigid filler in a joint that should flex
- Old sealant gone brittle and cracked
- Sealant pulling away from one side of the joint
Leave it or put it right?
Sealing over the top of old mastic does not hold for long. New sealant does not bond well to old, weathered sealant, so we always take the old sealant out. Where a wall is exposed, as many are in small places like Blewbury, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or drop us an email and we will talk you through it.
Why Blewbury customers choose us
- You choose the colour before work begins
- We leave the area clean and tidy
- Arbo and Everbuild products
- 180+ five-star Google reviews
See our cost guide and what customers say.
How we handle external mastic in Blewbury
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. Typical jobs include joints where the bead has come unstuck and cracked joints where brick meets render or frames, on joints between brick and frames, façade panels and render & cladding joints.
Older homes in small places like Blewbury may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water usually gets in.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Place
- Blewbury (OX11)
- Region
- Oxfordshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Blewbury
More services for Blewbury
Walls and rooflines in Blewbury
With historic houses such as Brightwell Manor (about 4.1 miles north-east) nearby, there’s older building stock in the area around Blewbury 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. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
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. Managing a site like Blewbury Endowed Church of England Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Blewbury is about 3 miles south of Didcot, in Oxfordshire. Every kind of property in Blewbury can book us for external mastic. The work is guaranteed for a year. Our Oxfordshire coverage runs to 443 places, and Blewbury is one of them. There’s also a page for Oxford, about 12 miles away.
Here we cover the OX11 postcode area for external mastic. External mastic is available to properties on Church Road, London Road and Church End. If you are just outside Blewbury, we cover Woodway (1 mile south), Upton (1 mile north-west), Aston Tirrold (1 mile east), East Hagbourne (2 miles north) and West Hagbourne (2 miles north-west). Further out, we also cover Oxford (12 miles north), Didcot (3 miles north), Abingdon-on-Thames (8 miles north), Wantage (8 miles west), Henley-on-Thames (14 miles east) and Grove (9 miles west).
Local landmarks in Blewbury
Locally, jobs take us to homes and businesses close to St Birinus School and The Load of Mischief pub and the streets around them. The closest station to Blewbury is Didcot Parkway station, about 2.9 miles north. Nearby you will also find Brightwell Castle (4.1 miles north-east) and Atlas Computer Laboratory (3.5 miles west). The countryside around Blewbury includes Mowbray Fields and Churn Hill.
Can I do it myself?
If you do try it yourself, take your time over the 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.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
The process
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. 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 as small as Blewbury, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Clear items away from the joints we’re working on
- Mention any tricky access
- Tell us if parking is tricky
How to get a quote
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To arrange one, phone 0345 464 0079 or send us an email.
Related advice
Blewbury: your questions answered
Is Blewbury in your area for external mastic?
Yes. Our work covers London and the South East, and Blewbury is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we will give you a clear quote.
Do you work for landlords with property near Didcot Parkway station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
When is the sealant fully cured?
Cure times vary by product and the temperature. Before we leave, we will tell you the cure time.
What’s an expansion joint in brickwork?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access.
Can new sealant go over the old?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Signs you need external mastic in Blewbury
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
These are the problems we’re asked about most:
- Cracked joints where brick meets render or frames
- Joints with sealant missing in places
- Water getting into walls through failed joints
- Sealant pulling away from one side of the joint
If you live in an older home near Church of St Michael, 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 guarantee comes with the work
- How much experience the applicator has
- What happens if they find a problem under the old sealant
What the job involves on each surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. We prime where the product needs it.
How we quote for external mastic
Your quote is based on your job. We take into account:
- Whether there’s mould to deal with
- How many areas need sealing
- When we can work, for business premises
- The amount of work
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Helping us quote
Photos help, but a description is a good start. Please mention:
- What the problem is, such as mould, gaps, leaks or cracking
- A few photos by email, if you can
- The address or postcode of the job
- How many joints, rooms or windows are involved
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Fix overflowing gutters above sealed joints
- Make sure movement joints aren’t pointed over
- Ask before painting over external sealant
- Clear growth from the base of walls and joints
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal before water has had years to get in.