Oxfordshire · England
External Mastic in Sandford St Martin
External mastic in Sandford St Martin from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weathered mastic that no longer stretches
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
External mastic in Sandford St Martin, done properly
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. If you have moss and dirt in joints with no sealant left and weathered mastic that no longer stretches, we can help, on copings & trims, render & cladding joints and concrete & block alike.
External sealant needs dry, clean surfaces, so work around Sandford St Martin is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Place
- Sandford St Martin (OX7)
- Region
- Oxfordshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Why it’s worth doing now in Sandford St Martin
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 small place like Sandford St Martin, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will go through it with you.
What you get with us
- Quality sealants from Arbo and Everbuild
- We agree the colour with you first
- Fully insured
- 12-month guarantee on every job
Sandford St Martin buildings and the weather
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.
In the older streets around Church of St Martin, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Sandford St Martin is about 9 miles south of Banbury, in Oxfordshire. We provide external mastic to householders, landlords and businesses in Sandford St Martin and the surrounding area, as part of our work across Oxfordshire. 443 places in Oxfordshire are on our list. You can also see our page for Oxford, roughly 14 miles from Sandford St Martin.
Every address in OX7 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on Mill Lane, Manor Road and Ledwell Road or a nearby road, our applicators can take on the job. Neighbouring places we cover for external mastic include Westcott Barton (1 mile south-east), Middle Barton (1 mile east), Nether Worton (2 miles north), Steeple Barton (2 miles south-east) and Duns Tew (3 miles north-east). Within a short drive, we also cover Oxford (14 miles south-east), Banbury (9 miles north), Bicester (10 miles east), Witney (11 miles south-west), Carterton (15 miles south-west) and Kidlington (9 miles south-east).
What’s near Sandford St Martin
Around Sandford St Martin, our work takes us to homes and buildings near The Fox Public House. Sandford St Martin’s nearest station is Heyford station, roughly 4.1 miles east. A little further out are Deddington Castle (4.5 miles north-east) and Old Forge Museum (Great Tew) (2.3 miles north-west).
DIY sealant or a professional job?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Do you need external mastic in Sandford St Martin?
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
People generally contact us after spotting something like this:
- Hard, crazed mastic that has stopped moving
- Joints where the bead has come unstuck
- Movement joints with cracked, split or missing sealant
- Failed sealant between panels on a façade
If you let a flat or house near Heyford station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Before you book anyone
- How the surfaces are prepared before sealing
- Who does the work, and how experienced they are
- Whether they seal over old material or remove it
- When the joint can take water or movement
When something else is needed
A few problems are outside what sealant work can do:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Structural movement, which needs a surveyor or engineer
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
Where we work in Sandford St Martin
- Façade panels
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
The process
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. In a small place like Sandford St Martin, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Clear the area around the work
- Let us know if you’ve seen damp or leaks
- Mention any parking rules near the property
Get 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’ll have a clear quote before we start.
Related advice
Sandford St Martin: your questions answered
I let a flat near Heyford station. Can you help?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Is Sandford St Martin in your area for external mastic?
Yes, Sandford St Martin is within the area we cover. Our work covers London and the South East. 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 price.
How do you reach high-level joints?
It depends on the building. Where joints can be reached safely, we will do them. Tell us about the building and we’ll confirm what access is needed.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Can new sealant go over the old?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Where do you work from?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
What is a movement joint?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking.
Towns and villages near Sandford St Martin
More services for Sandford St Martin
Surface by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant.
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. We reseal them with a sealant suited to the panel material.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.