Buckinghamshire · England
External & façade joints in Adstock, Buckinghamshire
External mastic in Adstock from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Joints where the bead has come unstuck
- Moss and dirt in joints with no sealant left
- Failed sealant between panels on a façade
How the job changes by surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. We prime where the sealant needs it before the bead.
About our external mastic in Adstock
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We strip the joint back and start again. If you have damp patches traced to an open external joint and panel joints letting water in, we can help, on joints between brick and frames, brickwork movement joints and concrete & block alike.
Around Adstock, 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.
Big or small, you get the same one-year guarantee in Adstock and across Buckinghamshire.
- Location
- Adstock (MK18)
- Region
- Buckinghamshire
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Adstock
Also in Adstock
Common problems we fix in Adstock
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
If you can see any of these, it’s time to have the joints looked at:
- Sealant pulling away from one side of the joint
- Joints with sealant missing in places
- Weeds or debris growing in open joints
- Damp patches traced to an open external joint
For an older house near a landmark such as Church of St Cecilia, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before you book
- How long to leave it before use
- What happens if they find a problem under the old sealant
- How the colour is chosen
- Who does the work, and how experienced they are
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Why it’s worth doing now in Adstock
A failed movement joint lets water into the wall, behind render and cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. Where a wall is exposed, as many are in small places like Adstock, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why Adstock clients choose us
- ARBOMaster approved applicator
- We never seal over old sealant
- White, clear, grey or coloured to suit, where the product allows
- A 12-month guarantee on all work
What sealant work can’t fix
Before you book, it’s worth knowing the limits:
- Movement that is more than a sealant joint can take
- Walls that need new movement joints cut into them
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
Where we work in Adstock
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Concrete & block
The process
At the end, we look at the finished work together and explain the cure time. The visit itself generally takes anything from a few hours to several days, depending on the building, depending on how much there is to do. Somewhere as small as Adstock, 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.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
How to get a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or drop us an email.
Advice
Adstock buildings and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Claydon House (about 3.2 miles south) nearby, there’s older building stock in the area around Adstock as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as Padbury Church of England School, its movement joints, gutters and trims need looking after like any other building’s.
Adstock is about 3 miles south-east of Buckingham, in Buckinghamshire. From the centre of Adstock to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across Buckinghamshire, we cover 263 places, and Adstock is one of them. We also work in Oxford, around 20 miles away.
Work in MK18 works the same way as everywhere else we cover. That includes homes and businesses on Main Street, East Street and Greenfields. Other places close to Adstock include Padbury (1 mile west), Thornborough (2 miles north), East Claydon (3 miles south), Middle Claydon (3 miles south-west) and Steeple Claydon (3 miles south-west). Larger places within reach include Aylesbury (11 miles south-east), Elmhurst (11 miles south-east), Southcourt (12 miles south-east), Haydon Hill (10 miles south), Turnfurlong (12 miles south-east) and Haddenham (13 miles south).
Landmarks near Adstock
Locally, jobs take us to homes and businesses close to Sir Thomas Fremantle School and The Folly Inn, among other places. A little further out are Buckingham Community Hospital (3.5 miles north-west) and Buckingham Castle (3.5 miles north-west). Open spaces near Adstock include Buckingham Sand Pit.
Adstock: your questions answered
Do you cover smaller places like Adstock?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is there a guarantee on external mastic in Adstock?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Can tenants book the work?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Where is Mr Mastic based?
We work from Crawley. We cover Adstock and the rest of Buckinghamshire.
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, and we’ll explain our choice.
How long does the job take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
Can you do several jobs on one visit?
Yes. Several rooms, windows or areas can go on one quote.
Quotes for external mastic in Adstock
Jobs vary more than people expect. What affects the quote:
- How many areas need sealing
- The size of the job
- How much old sealant there is and how hard it is to remove
- Access and height
What you pay reflects the work, not guesswork. That is why we ask a few questions first and agree the price before starting.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Roughly how big the job is
- Where the property is
- Access, such as stairs, a lift or height
- Whether it has been sealed before
If you are in Adstock and need external mastic, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.