Buckinghamshire · England
External Mastic in Kingsash
Specialist external mastic for Kingsash: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Failed seals between different materials
- Movement joints filled with mortar instead of sealant
- Weathered mastic that no longer stretches
Kingsash questions
Do you work for landlords with property near Wendover station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Is Kingsash within the area you cover?
Yes, Kingsash 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.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Is it worth trying it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Do you work at height?
It depends on the height and the site. Low-level joints are straightforward; for higher work, tell us about the building and we will confirm what’s needed.
How do I get a quote for external mastic in Kingsash?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs.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.
Do you remove the old sealant?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
How often do external joints need resealing?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Every job carries our one-year guarantee.
External mastic in Kingsash, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. If you’re dealing with hard, crazed mastic that has stopped moving and failed seals between different materials, we can help.
In a village or hamlet like Kingsash, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Place
- Kingsash (HP16)
- Region
- Buckinghamshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Also near Kingsash
More services for Kingsash
How we quote for external mastic
Call for a quick quote. The main things that affect it are:
- Mould in or behind the old joints
- Whether the work is at height
- When we can work, for business premises
- The size of the job
Doing several joints on one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear quote for the lot.
What to tell us for a quote
Photos help, but a description is a good start. Please mention:
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- What’s wrong with the joints now
- Any access issues, like height or stairs
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
Keeping the joints in good condition
So the new joints stay in good condition:
- Keep high-pressure jets off the joints
- Don’t let climbing plants root in the sealant
- Show decorators and builders where the movement joints are
- Never let anyone fill a movement joint with mortar
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
What external mastic looks like in Kingsash
With historic houses such as Cholesbury Manor House (about 2.7 miles east) nearby, there’s older building stock in the area around Kingsash 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Wendover station, outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as Old Church of St John the Baptist, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Kingsash is about 5 miles north-west of Chesham, in Buckinghamshire. Anywhere in HP16, we can carry out external mastic at your property. Our Buckinghamshire coverage runs to 263 places, and Kingsash is one of them. We also work in Oxford, around 22 miles away.
Postcode districts we cover here for external mastic: HP16. Nearby, we also carry out external mastic in Lee Gate (1 mile east), Wendover Dean (1 mile south-west), Hunt's Green (1 mile south-east), Wendover (2 miles north-west) and Great Missenden (3 miles south). Further out, we also cover Aylesbury (7 miles north-west), High Wycombe (8 miles south), Chesham (5 miles south-east), Marlow (12 miles south), Amersham (7 miles south-east) and Beaconsfield (10 miles south).
Local landmarks in Kingsash
Typical jobs here are in homes near The Gate Public House and John Colet School, among other places. The closest station to Kingsash is Wendover station, roughly 2 miles north-west of the centre. Well-known places in the area include Trenchard Museum (2.4 miles north) and Chiltern Hospital (3.7 miles south). Green spaces nearby include Dancersend Nature Reserve and Haddington Hill.
The process
Good joint work is mostly preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes anything from a few hours to several days, depending on the building. In a small place like Kingsash, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Clear items away from the joints we are working on
- Tell us about any previous sealing or DIY attempts
- Tell us about any water getting in
Getting a quote
Getting a quote is simple: let us know the job and the location and its rough size. A few photos by email make the job easier to understand, and we’ll take it from there.
Advice
Why it’s worth doing now in Kingsash
A failed movement joint lets water into the wall and can run behind render or cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. Where a wall is exposed, as many are in small places like Kingsash, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why choose Mr Mastic in Kingsash
- We’re fully insured
- We leave the area clean and tidy
- White, clear, grey or coloured to suit, where the product allows
- ARBOMaster approved applicator
See our cost guide and our reviews.
Common problems we fix in Kingsash
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
Look out for these signs:
- Gaps where render, brick and frames meet
- Movement joints filled with mortar instead of sealant
- Old sealant gone brittle and cracked
- Weeds or debris growing in open joints
If you look after a building such as Wendover House School, its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- How the surfaces are prepared before sealing
- The length of the guarantee
- What product goes in the joint
- How much experience the applicator has
How the job changes by surface
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap so the sealant is not too deep.
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant if the joint can be cleared.
What we cannot put right
We’d rather tell you now than do work that will not last, so these are the limits:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Render that is blown, hollow or coming away
- Movement that’s more than a sealant joint can take
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in Kingsash
- Façade panels
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
- Concrete & block