Oxfordshire · England
External Mastic in Wantage
We cover Wantage for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Gaps where render, brick and frames meet
- Weeds or debris growing in open joints
- Joints pointed up with cement by mistake
What we can’t put right
Sealant isn’t the answer to every problem, and we’ll tell you before we start. Sealant will not put right:
- Cracks in the bricks or render themselves, away from the joints
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp that isn’t coming from the joint
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
What we seal
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Concrete & block
External mastic for homes and businesses in Wantage
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 where mortar or filler would crack. If you have failed sealant between panels on a façade and brick movement joints where the sealant has split, we can put it right, on concrete & block, façade panels and joints between brick and frames alike.
Wantage mixes older houses and their gutters with newer estates of brick, render and uPVC trims. All of those joints move, so they need a flexible sealant rather than a rigid filler.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Place
- Wantage (OX12)
- Region
- Oxfordshire
- Guarantee
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Wantage and across Oxfordshire. Several sites can go on one quote, and we are fully insured for the work.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
Different surfaces, different methods
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it or an approved alternative. Send us any details you have about the façade.
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Towns and villages near Wantage
More services for Wantage
Why it’s worth doing now in Wantage
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. In a family home in Wantage, a failed seal around a bath or a frame lets water into places you cannot see, like the floor under a bath, the back of a panel or the inside of a wall. Left alone, that means rot, damp and a bigger repair.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Why book with us
- Colour picked to suit the job
- Approved under the ARBOMaster scheme
- We are fully insured
- 4.9 on Google from 180+ five-star reviews
What external mastic looks like in Wantage
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.
If you live in an older home near Church of St Peter and St Paul, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Wantage is about 8 miles west of Didcot, in Oxfordshire. We carry out external mastic for homeowners, landlords and businesses in Wantage, as part of our work across Oxfordshire. Wantage is one of 443 places in Oxfordshire we cover. Our Oxford page covers work nearby (14 miles or so).
Here we cover the OX12 postcode area for external mastic. External mastic is available to properties on Market Place, Limborough Road and Humber Close. Being close to the A338 and A417, Wantage is easy for our applicators to reach for external mastic. If you’re just outside Wantage, we cover Charlton (1 mile east), East Challow (1 mile west), Letcombe Regis (2 miles south-west), West Challow (2 miles west) and Childrey (2 miles west). We also work in nearby towns such as Oxford (14 miles north-east), Didcot (8 miles east), Abingdon-on-Thames (8 miles north-east), Witney (14 miles north), Carterton (14 miles north-west) and Faringdon (8 miles north-west). Being one of Oxfordshire’s larger places, Wantage has every kind of property, from flats to offices.
Landmarks near Wantage
We work in homes and buildings around King Alfred's, Betjeman Millennium Park and The Abingdon Arms, among other places. Other landmarks nearby include Williams F1 Grand Prix Collection (1.9 miles north). Green spaces nearby include Letcombe Valley and Chain Hill.
What we are called out for in Wantage
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
The problems people usually mention when they call include:
- Panel joints letting water in
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
- Brick movement joints where the sealant has split
Schools such as St Mary's School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- How long to leave it before use
- Which colour the sealant will be
- Are they insured?
- How the surfaces are prepared before sealing
The process
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to several days, depending on the building. In Wantage, parking is rarely complicated, though it helps to know about driveways or restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- First we look over the joints with you, agree which to renew and talk through access.
- 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.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Keep children and pets away from the work area
- Mention any parking rules near the property
- Clear items away from the joints we are working on
How to get a quote
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.
Advice
Common questions in Wantage
Is external mastic in Wantage guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Is Wantage in your area for external mastic?
Yes. Our work covers London and the South East, and Wantage is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
How much does external mastic cost in Wantage?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint.
Why do you put foam in the joint first?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.