Oxfordshire · England
External & façade joints in Chinnor, Oxfordshire
We cover Chinnor for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Old sealant gone brittle and cracked
- Rain getting behind render or cladding at a joint
- Moss and dirt in joints with no sealant left
When to call us in Chinnor
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.
Signs it’s time to call us include:
- Water getting into walls through failed joints
- Old sealant gone brittle and cracked
- Failed sealant between panels on a façade
- Joints with sealant missing in places
Managing a site like St Andrew's Church of England Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- How the joint is cleaned and prepared
- How long the guarantee is
- Whether they’re fully insured
- Which sealant they’ll use, and why
How we handle external mastic in Chinnor
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. We work on render & cladding joints, brickwork movement joints and joints between brick and frames, and people most often call us about old sealant gone brittle and cracked and rigid filler in a joint that should flex.
Houses in smaller places like Chinnor 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 usually the first to go.
Each job carries a 12-month guarantee, large or small.
- Place
- Chinnor (OX39)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Chinnor questions
Do you cover Chinnor for external mastic?
Yes, Chinnor is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Can you help a landlord with a rental near Princes Risborough station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
When will the joints need doing again?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Every job carries our 12-month guarantee.
Is it OK to seal over old sealant?
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.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. The sealant is matched to both sides.
How do you reach high-level joints?
It depends on the height and the site. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Are you insured?
Yes. We are fully insured.
Landlords, agents and businesses in Chinnor
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured.
Surface by surface
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
What sealant work can’t fix
A few problems are outside what sealant work can do:
- Rising or penetrating damp from elsewhere in the wall
- Subsidence or other structural problems
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Surfaces we seal
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
- Joints between brick and frames
- Façade panels
- Concrete & block
Places near Chinnor
Other services in Chinnor
Walls and rooflines in Chinnor
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Adwell House (about 3.6 miles west) are a reminder that the area around Chinnor has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Homes close to Church of St Andrew include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Rented homes near Princes Risborough station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Chinnor is about 8 miles north-west of High Wycombe, in Oxfordshire. From the centre of Chinnor to the outskirts, we cover external mastic for every kind of property. Chinnor is one of 443 towns and villages in Oxfordshire we cover for external mastic. For nearby work, see our Oxford page, about 14 miles away.
All of OX39 is within our area for external mastic. If you need external mastic at a property on Station Road, Woodgreen Square and Church Road or a nearby road, we can help. Other places close to Chinnor include Emmington (1 mile north-west), Sydenham (2 miles west), Kingston Stert (2 miles west), Towersey (3 miles north) and Kingsey (4 miles north). We also work in nearby towns such as Oxford (14 miles west), Henley-on-Thames (12 miles south), Benson (10 miles south-west), Headington Quarry (13 miles west), St John Street area (15 miles west) and Wallingford (12 miles south-west).
Landmarks near Chinnor
Around Chinnor, our work takes us to homes and buildings near The Crown pub, among other places. The nearest railway station is Princes Risborough station, about 3.1 miles north-east of the centre. Other landmarks nearby include Thame Community Hospital (4 miles north-west). Not far away are Bald Hill and Oakley Hill nature reserve.
The process
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself generally takes a few hours for a handful of joints, longer for a whole elevation, depending on the amount of work. A visit to Chinnor is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Clear the area around the work
- Let us know if you’ve seen damp or leaks
- Try not to wet indoor joints just before the visit
How to get a quote
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Advice
Looking after it afterwards
After the cure time, these simple habits help:
- Get split or bare joints resealed while the damage is small
- Walk round the building once a year and look at the joints
- Avoid pressure-washing directly into sealant joints
- Point out the joints to other trades
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead over time.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- The number and length of the joints
- The old material and how stubborn it is
- How many areas need sealing
- Any mould that needs treating
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- How we’d reach the joints
- The rough size of the job
- Pictures of the joints, sent by email
- The type of property
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.