Buckinghamshire · England
External & façade joints in Coombe, Buckinghamshire
Our applicators work in Coombe on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
- Plants rooting in failed movement joints
How it works
We keep the work tidy and contained to the area we are working on. Expect the work to take a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. Somewhere like Coombe needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Let us know about parking restrictions
- Clear the area around the work
- Keep children and pets away from the work area
How to get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or send us an email.
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How we handle external mastic in Coombe
For buildings in Coombe, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. If you have hard, crazed mastic that has stopped moving and cracked joints where brick meets render or frames, we can help.
External sealant needs dry, clean surfaces, so work around Coombe is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Coombe (HP17)
- Region
- Buckinghamshire
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Outside joints around Coombe
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Great Kimble Church of England School? Then larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as Church of St Peter and St Paul, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Coombe is about 5 miles south of Aylesbury, in Buckinghamshire. For external mastic in and around Coombe, please phone 0345 464 0079 or drop us an email for a quick quote. We cover Buckinghamshire from our Crawley base, Coombe included. Across Buckinghamshire, we cover 263 places, and Coombe is one of them. For nearby work, see our Oxford page.
All of HP17 is covered for external mastic, from the main roads to the quietest streets. We also cover Butler's Cross (1 mile north), Ellesborough (1 mile north-west), Chalkshire (1 mile north), Terrick (1 mile north) and Nash Lee (1 mile north). Further out, we also cover Aylesbury (5 miles north), High Wycombe (8 miles south), Chesham (8 miles east), Marlow (12 miles south), Amersham (9 miles south-east) and Beaconsfield (11 miles south-east).
What’s near Coombe
Around Coombe, our work takes us to homes and buildings near John Colet School and The Russell Arms and the streets around them. The closest station to Coombe is Little Kimble station, about 1.3 miles west of the centre. Nearby you’ll also find Little Kimble Motte (1 mile west) and Trenchard Museum (3.1 miles north-east). The countryside around Coombe includes Brush Hill Local Nature Reserve and Coombe Hill.
Places near Coombe
Other services in Coombe
How we quote for external mastic
Jobs vary more than people expect. What affects the quote:
- Any working-time requirements on site
- How easy the joints are to reach
- Which sealant suits the joint
- The size of the job
The cost depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Helping us quote
When you contact us, these details help:
- What’s wrong with the joints now
- Whether it has been sealed before
- Where the job is, and your postcode
- Pictures of the joints, sent by email
Asking for a quote is easy: let us know what needs doing and where and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
When to call us in Coombe
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Look out for any of the following:
- Plants rooting in failed movement joints
- Sealant pulling away from one side of the joint
- Damp patches traced to an open external joint
- Old sealant gone brittle and cracked
If you let a flat or house near Little Kimble station, split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- Who does the work, and how experienced they are
- What happens if the job turns out different
- What guarantee comes with the work
- Are they insured?
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Clear growth from the base of walls and joints
- Deal with leaking gutters that soak the joints below
- Ask before painting over external sealant
- Avoid pressure-washing directly into sealant joints
Don’t paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Once a joint cannot move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
Why act early in Coombe
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. In a small place like Coombe, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first and send you a clear quote before we start.
Why choose Mr Mastic in Coombe
- 4.9 on Google from 180+ five-star reviews
- 20+ years of sealant experience
- Sanitary silicone with an anti-fungal additive in wet areas
- Fully insured
Common questions in Coombe
Is Coombe within the area you cover?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is Coombe in your area for external mastic?
Yes, Coombe is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
What does external mastic cost?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or email us with a short description of the job.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
What colours does the sealant come in?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin from the range available.
Can landlords and businesses book you?
Yes. We work for homeowners, landlords, letting agents, businesses and hotels.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Pointing it stops it working, and the wall may crack nearby. We’ll reseal it with a flexible sealant.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
How the job changes by surface
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so neither cracks the other.
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best.