Buckinghamshire · England
Ashendon External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Ashendon. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Weeds or debris growing in open joints
- Rigid filler in a joint that should flex
- Water getting into walls through failed joints
External mastic for homes and businesses in Ashendon
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall. We’re often asked to deal with rigid filler in a joint that should flex and cracked joints where brick meets render or frames, on brickwork movement joints, copings & trims and façade panels.
Somewhere as small as Ashendon, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
Every job comes with a one-year guarantee.
- Location
- Ashendon (HP18)
- Region
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Do you need external mastic in Ashendon?
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:
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
- Cracked joints where brick meets render or frames
- Joints where the bead has come unstuck
If you let a flat or house near Haddenham & Thame Parkway station, split movement joints are easy to miss on a rental until damp shows inside.
What your quote should include
- How hidden problems are handled
- Whether they’re fully insured
- Whether VAT is included
- Which sealant they’ll use, and why
Places near Ashendon
More services for Ashendon
DIY versus a professional finish
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Ashendon buildings and the weather
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Waddesdon Manor (about 2.3 miles north-east) nearby, there’s older building stock in the area around Ashendon as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Homes close to Parish Church of St Mary the Virgin include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Ashendon is about 5 miles north of Thame, in Buckinghamshire. Homes, rented property, offices and hotels in Ashendon can book us for external mastic, old or new, large or small. The work is guaranteed for a year. We cover 263 towns and villages across Buckinghamshire, large and small. You can also see our page for Oxford, about 12 miles away.
We work across HP18 for external mastic. You will find streets such as Main Street, Lower End and The Close. If you are just outside Ashendon, we cover Nether Winchendon (2 miles south-east), Westcott (2 miles north-east), Upper Winchendon (2 miles east), Waddesdon (3 miles north-east) and Wormstone (3 miles north-east). We also work in nearby towns such as Aylesbury (7 miles east), Buckingham (12 miles north), Elmhurst (7 miles east), Southcourt (7 miles east), Princes Risborough (9 miles south-east) and Haydon Hill (6 miles east).
Landmarks near Ashendon
For rail, the closest station is Haddenham & Thame Parkway station, about 3.9 miles south-east. Nearby you will also find Dinton Castle (4.1 miles south-east) and St John's Hospital (4.6 miles east). Open spaces near Ashendon include Snakemoor.
What affects the cost of external mastic
Every job gets its own quote. This is what makes a difference:
- The number and length of the joints
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
- Access and height
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- The rough size of the job
- What’s wrong with the joints now
- The type of property
- Any previous sealing or DIY work
Asking for a quote is easy: let us know the job and the location. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
Why act early in Ashendon
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Where a wall is exposed, as many are in small places like Ashendon, wind-driven rain gets into any failed joint, 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 agree the price before starting.
Why choose Mr Mastic in Ashendon
- Sanitary silicone with an anti-fungal additive in wet areas
- A choice of colours where the product allows
- Over 20 years’ experience
- Neat joints and a tidy finish
How it works
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. For a village or hamlet like Ashendon, the journey is planned in advance: let us know about lanes, gates and parking. 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.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any previous sealing or DIY attempts
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Related advice
Landlords, agents and businesses in Ashendon
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Letting agents and landlords in Ashendon can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Leave the joints unpainted unless we’ve said otherwise
- Deal with leaking gutters that soak the joints below
- Have failed joints looked at early
- Show decorators and builders where the movement joints are
Don’t let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
Questions from Ashendon
Do you cover Ashendon for external mastic?
Yes. We work across London and the South East, and Ashendon is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
Do you cover smaller places like Ashendon?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
How long will you be here?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we will say how long yours will take.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
What is backing rod for?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint before we leave.
How do I get a quote for external mastic in Ashendon?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before we start.