Buckinghamshire · England
External Mastic in Great Hampden
Professional external mastic in and around Great Hampden, with every bit of old sealant taken out first and a 12-month guarantee.
- Water getting into walls through failed joints
- Joints where the bead has come unstuck
- Movement joints with cracked, split or missing sealant
What the job involves on each surface
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so the movement is taken up.
Concrete and blockwork
The face of concrete or block is often dusty, so preparation is key. We prime where the sealant needs it before sealing.
About our external mastic in Great Hampden
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. Typical jobs include damp patches traced to an open external joint and failed seals between different materials, on joints between brick and frames, façade panels and render & cladding joints.
Outside joints can only be sealed when they’re dry, so work in Great Hampden is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Where
- Great Hampden (HP16)
- Region
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes a few hours for a handful of joints, longer for a whole elevation from start to finish. In a small place like Great Hampden, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Keep children and pets away from the work area
- Let us know about parking restrictions
- Tell us about any water getting in
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. Whenever you are ready, call 0345 464 0079 or email us.
Read more
Common problems we fix in Great Hampden
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
Keep an eye out for these signs:
- Brick movement joints where the sealant has split
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
- Leaking joints around cladding and façade panels
For landlords with property near Great Missenden station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- Whether they’re fully insured
- Whether they seal over old material or remove it
- How the joint is cleaned and prepared
- Is VAT in the price?
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Great Hampden and across Buckinghamshire. We can quote a run of properties together.
We work for letting agents and landlords as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- How easy the joints are to reach
- How many areas need sealing
- The product the joint needs
- The number and length of the joints
Combining jobs into one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Access, such as stairs, a lift or height
- The type of property
- Where the property is
- Any previous sealing or DIY work
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
External mastic in Great Hampden: local notes
Historic houses like Hughenden Manor (about 3.8 miles south) are a reminder that the area around Great Hampden has older buildings as well as new. 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around Church of St Mary Magdalene, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Great Hampden is about 5 miles north of High Wycombe, in Buckinghamshire. We provide external mastic to homes and businesses in Great Hampden and nearby. We cover 263 towns and villages across Buckinghamshire, large and small. Reading is on our list too, about 20 miles from Great Hampden.
Every address in HP16 is covered for external mastic. We cover properties on School Lane and Memorial Road. If you are just outside Great Hampden, we cover Great Missenden (3 miles east), Wendover Dean (3 miles north-east), Coombe (3 miles north), Hunt's Green (3 miles north-east) and Kingsash (4 miles north-east). Further out, we also cover Aylesbury (8 miles north), High Wycombe (5 miles south), Chesham (7 miles east), Marlow (9 miles south), Amersham (7 miles east) and Beaconsfield (8 miles south-east).
Local landmarks in Great Hampden
Typical jobs here are in homes near The Hampden Arms. Great Hampden’s nearest station is Great Missenden station, about 2.6 miles east of the centre. Nearby you’ll also find Roald Dahl Museum and Story Centre (2.8 miles east) and Chiltern Hospital (3.4 miles east). Not far away are Prestwood Local Nature Reserve and Beacon Hill.
Towns and villages near Great Hampden
More services for Great Hampden
How to look after the new joints
After the cure time, these simple habits help:
- Look over the joints every year, ideally after winter
- Have failed joints looked at early
- Wash walls gently around the sealant
- Don’t let climbing plants root in the sealant
Don’t let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
FAQs for Great Hampden
Can you do external mastic in Great Hampden?
Yes, Great Hampden is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
Do you cover smaller places like Great Hampden?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Do you guarantee your work?
Yes, always. Each job is guaranteed for twelve months, large or small.
How long will you be here?
A typical job takes anything from a few hours to several days, depending on the building, including preparation and clearing up. Your quote will say how long we expect yours to take.
How long should I leave it?
That depends on the sealant used, so follow the cure time we give you.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses, and we are fully insured.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.