Buckinghamshire · England
External & façade joints in Coleshill, Buckinghamshire
Professional external mastic in and around Coleshill, with old sealant always removed completely and a one-year guarantee.
- Panel joints letting water in
- Sealant that has lost its bond to the brick or render
- Weathered mastic that no longer stretches
External mastic for homes and businesses in Coleshill
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. We are often asked to deal with panel joints letting water in and plants rooting in failed movement joints, on brickwork movement joints, concrete & block and render & cladding joints.
External sealant needs dry, clean surfaces, so work around Coleshill is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
We stand behind the work with a one-year guarantee.
- Location
- Coleshill (HP7)
- Wider area
- Buckinghamshire
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlord and commercial work in Coleshill
Landlords and letting agents in Coleshill can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured.
What the job involves on each surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
Render joints
Water behind render can lead to blown patches. Resealing the joints early keeps water out.
When to call us in Coleshill
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
Common reasons people contact us include:
- Leaking joints around cladding and façade panels
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
- Rigid filler in a joint that should flex
For site and facilities teams at buildings such as Coleshill Church of England Infant School, its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before booking
- How long the guarantee is
- What happens if the job turns out different
- Whether VAT is included
- When the joint can take water or movement
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- The old material and how stubborn it is
- The type of sealant required
- Any working-time requirements on site
- The amount of work
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Asking for a quote
You do not need to know the technical terms. Just tell us:
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
- What’s wrong with the joints now
- Any previous sealing or DIY work
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.
What we do, step by step
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and clear up. Most jobs take anything from a few hours to several days, depending on the building. For a village or hamlet like Coleshill, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip 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.
Before we arrive
- Tell us if parking is tricky
- Keep children and pets away from the work area
- Move anything stored near the joints
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details.
Read more
Why it’s worth doing now in Coleshill
A failed movement joint lets water into the wall, behind render and cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. Around Coleshill, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why choose Mr Mastic in Coleshill
- A choice of colours where the product allows
- Trusted Arbo and Everbuild sealants
- Fully insured
- Colour agreed with you before any work starts
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Failed render or damaged cladding panels
- Damp that isn’t coming from the joint
- Adding movement joints to masonry that has none
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Surfaces we seal
- Render & cladding joints
- Copings & trims
- Façade panels
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
Common questions in Coleshill
Is Coleshill within the area you cover?
Yes. Coleshill is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
I let a flat near Amersham station. Can you help?
Yes. We work for landlords and letting agents as well as householders. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We will talk through colour options before any work starts from the range available.
What information do you need?
The location, the problem and the rough size of the job. Photos by email help too.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Do you use backing rod?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us.
Nearby places to Coleshill
Other services in Coleshill
Coleshill buildings and the weather
With historic houses such as Chenies Manor House (about 4.6 miles north-east) nearby, there’s older building stock in the area around Coleshill as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Amersham station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. For an older house near a landmark such as Church of All Saints, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Coleshill is about 2 miles south-west of Amersham, in Buckinghamshire. Across the HP7 area, our applicators can take on external mastic. Coleshill is one of 263 towns and villages in Buckinghamshire we cover for external mastic. For nearby work, see our Reading page (20 miles or so).
Every address in HP7 is within our area for external mastic. If you need external mastic at a property on Village Road, Meadowcot Lane and Barracks Hill or anywhere close by, we can help. If you’re just outside Coleshill, we cover Winchmore Hill (1 mile west), Woodrow (1 mile north-west), Penn Street (2 miles north-west), Mop End (2 miles north-west) and Amersham on the Hill (2 miles north-east). We also work in nearby towns such as Aylesbury (14 miles north-west), High Wycombe (5 miles west), Chesham (4 miles north), Marlow (8 miles south-west), Beaconsfield (3 miles south) and Chalfont St Peter (4 miles south-east).
Landmarks near Coleshill
Locally, jobs take us to homes and businesses close to Amersham School, The Red Lion pub and Amersham Hall and the streets around them. The closest station to Coleshill is Amersham station, roughly 2 miles north-east. A little further out are Great Missenden (4 miles north-west) and Amersham Hospital (1.1 miles north). Not far away are Long Grove Wood.