Oxfordshire · England
Grimsbury External Mastic
External mastic for Grimsbury and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
- Panel joints letting water in
About our external mastic in Grimsbury
For buildings in Grimsbury, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. We work on copings & trims, render & cladding joints and façade panels, and people most often call us about brick movement joints where the sealant has split and failed sealant between panels on a façade.
Houses in smaller places like Grimsbury can stand more in the open than those in a built-up town, and walls and rooflines facing the weather take the worst of it. Joints on those sides are generally the first to go.
All our work is covered by a one-year guarantee.
- Place
- Grimsbury (OX16, OX17, OX15)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Make sure movement joints aren’t pointed over
- Walk round the building once a year and look at the joints
- Leave the joints unpainted unless we have said otherwise
- Don’t let climbing plants root in the sealant
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Your questions about external mastic in Grimsbury
Is Grimsbury within the area you cover?
Yes. Grimsbury is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is Grimsbury in your area for external mastic?
Yes. Our work covers London and the South East, and Grimsbury is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages to suit the site.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Pointing it stops it working. We’ll reseal it with a flexible sealant.
Is there a guarantee?
Yes. All our work carries a one-year guarantee.
What is a movement joint?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned.
How the visit works
There’s no need to move everything out, just the space around the work. We protect the rest, and the job takes anything from a few hours to several days, depending on the building for a typical job. For a job in Grimsbury, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First, the joints are inspected and the access agreed.
- 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.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Try not to wet indoor joints just before the visit
- Mention any parking rules near the property
- Mention any sign-in or site rules at work premises
Getting a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will explain what’s involved before giving you a price.
Related advice
Other services in Grimsbury
What the job involves on each surface
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
Cladding and façade panels
Cladding and façade panels are normally separated by sealed joints. We reseal them with a sealant suited to the panel material.
Quotes for external mastic in Grimsbury
Jobs vary more than people expect. What affects the quote:
- Access and height
- The old material and how stubborn it is
- The number and length of the joints
- Any mould that needs treating
What it costs depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
Asking for a quote
When you call or email, it’s useful to know:
- Roughly how big the job is
- What’s wrong with the joints now
- Photos by email, if that is easy
- 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 add photos by email if you can.
Landlord and commercial work in Grimsbury
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
We work for landlords and letting agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Why it’s worth doing now in Grimsbury
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. In a smaller place like Grimsbury, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, call 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Grimsbury
- We leave the area clean and tidy
- Sealant colour chosen to suit
- Every job guaranteed for a year
- Quality sealants from Arbo and Everbuild
Read what affects the cost and customer reviews.
What sealant work can’t fix
New sealant cannot fix everything, and we’d rather say so up front. It will not solve:
- Subsidence or other structural problems
- Adding movement joints to masonry that has none
- Cracks in the bricks or render themselves, away from the joints
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Where we work in Grimsbury
- Render & cladding joints
- Façade panels
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
Outside joints around Grimsbury
Historic houses like Broughton Castle (about 3.4 miles south-west) are a reminder that the area around Grimsbury has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around Saint Leonard's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Banbury station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Managing a site like St Leonard's Church of England Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Grimsbury is about 1 mile east of Banbury, in Oxfordshire. Grimsbury gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Grimsbury is one of 443 towns and villages in Oxfordshire where we work. Our Oxford page covers work nearby (22 miles or so).
Every address in OX16, OX17 and OX15 is within our area for external mastic. Whether your property is on Alma Road, Manor Road and Verney Road or a nearby road, we can help. Other places close to Grimsbury include Banbury (1 mile west), Neithrop (2 miles west), Ruscote (2 miles west) and Bodicote (2 miles south). Further out, we also cover Bicester (13 miles south-east), Bure Park (13 miles south-east), Chipping Norton (13 miles south-west), Woodstock (15 miles south), Bloxham (4 miles south-west) and Charlbury (15 miles south-west).
Around Grimsbury
Around Grimsbury, our work takes us to homes and buildings near Banbury Academy, The Pepper Pot pub and Ash-Shifa School and the streets around them. There’s a railway station in Grimsbury itself: Banbury station. Nearby you will also find Horton General Hospital (1 mile south-west) and Castle Quay Shopping Centre (0.5 miles west). Green spaces nearby include Crouch Hill and Farthinghoe Nature Reserve.