Oxfordshire · England
Hempton External Mastic
We cover Hempton for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly.
- Panel joints letting water in
- Old sealant gone brittle and cracked
- Plants rooting in failed movement joints
How we handle external mastic in Hempton
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you’re dealing with rigid filler in a joint that should flex and plants rooting in failed movement joints, we can put it right, whatever the surface.
External sealant needs dry, clean surfaces, so work around Hempton is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
All our work comes with our 12-month guarantee, wherever you are in Oxfordshire.
- Location
- Hempton (OX15)
- Region
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that is happened, we rake it out and reseal it properly if the joint can be cleared.
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.
Nearby places to Hempton
More services for Hempton
What affects the cost of external mastic
The price is agreed before any work begins. It takes into account:
- The size of the job
- When we can work, for business premises
- How easy the joints are to reach
- How many areas need sealing
Combining jobs into one visit is usually more efficient than separate visits. You will get one clear quote for the whole job.
What we need to know
Photos by email are helpful but not essential. Please mention:
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it’s a home or a business
- Pictures of the joints, sent by email
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
How it works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Hempton, 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.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Keep children and pets away from the work area
- Mention any sign-in or site rules at work premises
- Clear items away from the joints we are working on
Get a quote
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before work begins.
Advice
Looking after it afterwards
Simple care keeps the joints in good condition. Our advice:
- Make sure movement joints are not pointed over
- Don’t let climbing plants root in the sealant
- Show decorators and builders where the movement joints are
- Look over the joints every year, ideally after winter
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Can I do it myself?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
External mastic in Hempton: local notes
With historic houses such as Broughton Castle (about 4.3 miles north-west) nearby, there’s older building stock in the area around Hempton 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. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Kings Sutton station? Then split movement joints are easy to miss on a rental until damp shows inside.
Hempton is about 6 miles south of Banbury, in Oxfordshire. For external mastic in and around Hempton, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We are based in Crawley and cover Oxfordshire. Hempton is one of 443 towns and villages in Oxfordshire we cover. For nearby work, see our Oxford page (17 miles or so).
Postcode districts we cover here for external mastic: OX15. Whether your property is on Hempton Road, The Lane and St John's Way or anywhere close by, our applicators can take on the job. Neighbouring places we cover for external mastic include Barford St Michael (1 mile north-west), Barford St John (1 mile north-west), Deddington (1 mile east), Nether Worton (2 miles south-west) and Dane Hill (2 miles south-east). Within a short drive, we also cover Banbury (6 miles north), Bicester (10 miles south-east), Witney (15 miles south-west), Kidlington (12 miles south), Bure Park (10 miles south-east) and Chipping Norton (9 miles west).
Local landmarks in Hempton
Typical jobs here are in homes near George Inn and the streets around them. The nearest railway station is Kings Sutton station, about 4 miles north-east of the centre. Nearby you’ll also find Bloxham Village Museum (2.5 miles north) and Deddington Castle (1.6 miles east). Not far away are Crouch Hill.
Signs you need external mastic in Hempton
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
The problems people usually mention when they call include:
- Rigid filler in a joint that should flex
- Moss and dirt in joints with no sealant left
- Damp patches traced to an open external joint
- Failed sealant between panels on a façade
If you live in an older home near Saint John the Evangelist, an extension built onto an older house moves differently, and the joint between them takes the strain.
Before you book anyone
- How long to leave it before use
- How hidden problems are handled
- Whether you can choose the colour
- How the joint is cleaned and prepared
Why act early in Hempton
Sealing over the top of old mastic doesn’t hold for long. New sealant doesn’t bond well to old, weathered sealant, so the old joint is cut out fully first. In a small place like Hempton, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What you get with us
- Homes, businesses and hotels
- White, clear, grey or coloured to suit, where the product allows
- Approved under the ARBOMaster scheme
- 180+ five-star Google reviews
Read what affects the cost and customer reviews.
FAQs for Hempton
Can you help a landlord with a rental near Kings Sutton station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Can you do external mastic in Hempton?
Yes, Hempton is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing.
Can I add another job to the visit?
Yes. Just list everything you need and we’ll quote it together.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you.
Is there a guarantee?
Yes. All our work carries a 12-month guarantee.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.