Oxfordshire · England
External Mastic in Shirburn
Sealing brickwork movement joints, render, cladding and façade joints for Shirburn, backed by a one-year guarantee. Call for a quick quote.
- Gaps where render, brick and frames meet
- Movement joints filled with mortar instead of sealant
- Old sealant gone brittle and cracked
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
External mastic in Shirburn
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a matching colour. Typical jobs include moss and dirt in joints with no sealant left and panel joints letting water in, on concrete & block, façade panels and copings & trims.
Around Shirburn, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water normally gets in.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Where
- Shirburn (OX49)
- Wider area
- Oxfordshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Cladding and façade panels
If the façade has a specified sealant, that’s what we use or an approved alternative. Send us any details you have about the façade.
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
Also near Shirburn
Also in Shirburn
Landlords, agents and businesses in Shirburn
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Housing providers, facilities teams and property managers book us too in Shirburn and across Oxfordshire. We can quote a run of properties together.
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Check external joints each spring
- Keep movement joints as flexible joints, not mortar
- Get split or bare joints resealed while the damage is small
- Show decorators and builders where the movement joints are
Don’t let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Common problems we fix in Shirburn
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
Most people get in touch after spotting one of these:
- Panel joints letting water in
- Movement joints filled with mortar instead of sealant
- Movement joints with cracked, split or missing sealant
- Water getting into walls through failed joints
For site and facilities teams at buildings such as Icknield Community College, its movement joints, gutters and trims need looking after like any other building’s.
Before you book anyone
- What guarantee comes with the work
- What the cure time is
- What happens if they find a problem under the old sealant
- Which sealant they’ll use, and why
FAQs for Shirburn
Is Shirburn within the area you cover?
Yes, Shirburn is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you do external mastic in Shirburn?
Yes, Shirburn is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Do you seal joints where cladding meets other materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. We choose one that suits both surfaces.
Do you work for letting agents?
Yes, often. We can quote for several properties at once, and between tenancies is a good time for the work.
Can you do several jobs on one visit?
Yes. Several rooms, windows or areas can go on one quote.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
How long does external mastic last?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Our work comes with a 12-month guarantee.
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Where a wall is exposed, as many are in small places like Shirburn, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we will explain what it covers.
Why book with us
- An ARBOMaster approved applicator
- A choice of colours where the product allows
- 20+ years of sealant experience
- Arbo and Everbuild products
See what affects the cost and our reviews.
What external mastic looks like in Shirburn
With historic houses such as Adwell House (about 2.4 miles north) nearby, there’s older building stock in the area around Shirburn as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. 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 All Saints Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Shirburn is about 6 miles south of Thame, in Oxfordshire. Shirburn gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Our Oxfordshire coverage runs to 443 places, and Shirburn is one of them. We also work in Oxford, around 12 miles away.
Every address in OX49 is covered for external mastic. Local streets include Watlington Road, Castle Road and Blenheim Road, and we cover them all. If you are just outside Shirburn, we cover Lewknor (1 mile north-east), South Weston (2 miles north), Christmas Common (2 miles south-east), Postcombe (2 miles north) and Howe Hill (3 miles south). Further out, we also cover Oxford (12 miles north-west), Didcot (11 miles west), Abingdon-on-Thames (13 miles west), Thame (6 miles north), Henley-on-Thames (9 miles south-east) and Benson (5 miles south-west).
What’s near Shirburn
In Shirburn, that means homes and buildings near Watlington Primary School, St Mary's Church and The Chequers pub and the streets around them. For a walk, there’s Aston Rowant NNR and Bald Hill.
How the visit 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. After that, the work takes anything from a few hours to several days, depending on the building. Somewhere as small as Shirburn, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Tell us about access, such as stairs, a lift or high-level joints
- Plan for the work area to be out of bounds to pets and children
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.