Buckinghamshire · England
External & façade joints in Amersham on the Hill, Buckinghamshire
Specialist external mastic for Amersham on the Hill: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Damp patches traced to an open external joint
- Old sealant gone brittle and cracked
- Moss and dirt in joints with no sealant left
Amersham on the Hill buildings and the weather
With historic houses such as Chenies Manor House (about 3.2 miles east) nearby, there’s older building stock in the area around Amersham on the Hill as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as St. Michael and All Angels, an extension built onto an older house moves differently, and the joint between them takes the strain. Schools such as Dr Challoner's Grammar School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Amersham on the Hill is about 1 mile west of Amersham, in Buckinghamshire. We carry out external mastic for homes and businesses in Amersham on the Hill. Our area takes in 263 places across Buckinghamshire. Our Reading page covers work nearby, about 22 miles away.
All of HP6, HP7 and HP8 is within our area for external mastic, from the main roads to the quietest streets. We cover properties on The Avenue, Hyrons Lane and Station Road. Amersham on the Hill is on the A416 and A4154, so it’s easy for us to get to. We also cover Amersham (1 mile east), Chesham Bois (1 mile north), Waterside (2 miles north), Coleshill (2 miles south-west) and Woodrow (2 miles south-west). We also work in nearby towns such as Aylesbury (13 miles north-west), High Wycombe (7 miles south-west), Chesham (3 miles north), Marlow (10 miles south-west), Beaconsfield (5 miles south) and Chalfont St Peter (5 miles south-east).
Around Amersham on the Hill
Locally, jobs take us to homes and businesses close to The Boot and Slipper pub, Woodside Junior School and Home Tuition Service, among other places. There’s a railway station in Amersham on the Hill itself: Amersham station. Well-known places in the area include Great Missenden (3.7 miles north-west) and Amersham Fair Organ Museum (0.6 miles north-east). For a walk, there’s Sands Bank.
About our external mastic in Amersham on the Hill
On houses, flats and commercial buildings across Amersham on the Hill, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean joint faces and the right depth. We work on concrete & block, joints between brick and frames and façade panels, and common reasons people get in touch are moss and dirt in joints with no sealant left and gaps where render, brick and frames meet.
Around Amersham on the Hill, garages, outbuildings and extensions all add to the joints on the outside of a home. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
We stand behind the work with a one-year guarantee, so you’re not left on your own once the job is done.
- Place
- Amersham on the Hill (HP6, HP7, HP8)
- Wider area
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
The process
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. Expect the work to take anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. A visit to Amersham on the Hill is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Mention any leaks or damp you’ve noticed
- For business premises, tell us about site rules or sign-in
How to get a quote
For external mastic in Amersham on the Hill, call 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
Advice
Your questions about external mastic in Amersham on the Hill
Is Amersham on the Hill within the area you cover?
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.
I let a flat near Amersham station. Can you help?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or email us with the details for a clear quote.
Do I have to be there?
It depends on the job. For work indoors, someone needs to let us in.
Do you use backing rod?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
Is there a guarantee?
Yes, always. Each job is guaranteed for twelve months.
How long does external mastic take?
It depends on the size of the job, but as a guide it takes anything from a few hours to several days, depending on the building. We’ll give you a better idea when we quote.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Why is there a gap in my brick wall?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Rising or penetrating damp from elsewhere in the wall
- Cracked brickwork or render that needs a builder or plasterer
- Structural movement, which needs a surveyor or engineer
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Façade panels
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
Landlord and commercial work in Amersham on the Hill
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
DIY sealant or a professional job?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
How to look after the new joints
To keep the joints looking good and working properly:
- Show decorators and builders where the movement joints are
- Keep high-pressure jets off the joints
- Get split or bare joints resealed while the damage is small
- Don’t let climbing plants root in the sealant
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Act while the splits are small. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
Common problems we fix in Amersham on the Hill
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
Common reasons people contact us include:
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
- Moss and dirt in joints with no sealant left
- Movement joints filled with mortar instead of sealant
Rented homes near Amersham station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Questions to ask before booking
- Whether they’re fully insured
- How hidden problems are handled
- Is the old sealant removed completely?
- Which sealant they’ll use, and why
Towns and villages near Amersham on the Hill
More services for Amersham on the Hill
Different surfaces, different methods
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.