Buckinghamshire · England
External Mastic in Walter's Ash
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Walter's Ash. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Hard, crazed mastic that has stopped moving
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
What happens if it’s left?
A failed movement joint lets water into the wall. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. Around Walter's Ash, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Why Walter's Ash customers choose us
- Arbo and Everbuild products
- A choice of colours where the product allows
- A 12-month guarantee on all work
- Anti-fungal sanitary silicone in wet areas
Read what affects the cost and what customers say.
External mastic for homes and businesses in Walter's Ash
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two where a rigid filler would soon crack. Common call-outs are for moss and dirt in joints with no sealant left and rain getting behind render or cladding at a joint, across façade panels, brickwork movement joints and copings & trims.
Somewhere as small as Walter's Ash, 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.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Walter's Ash (HP14)
- Region
- Buckinghamshire
- Cover
- 12 months on all our work
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Also near Walter's Ash
What else we do in Walter's Ash
Honest limits
A few problems are outside what sealant work can do:
- Walls that need new movement joints cut into them
- Cracking across the wall rather than at a joint
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Surfaces we seal
- Render & cladding joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
Walter's Ash questions
Do you cover smaller places like Walter's Ash?
Yes. Walter's Ash is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is Walter's Ash in your area for external mastic?
Yes, Walter's Ash is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us and we are fully insured.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin.
Can new sealant go over the old?
No, because it fails. We remove every bit of old sealant first.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Is the work guaranteed?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
Landlords, agents and businesses in Walter's Ash
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
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 external mastic looks like in Walter's Ash
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. Historic houses like Hughenden Manor (about 2.2 miles south-east) are a reminder that the area around Walter's Ash has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
For site and facilities teams at buildings such as Naphill and Walters Ash School, larger buildings have long runs of movement joint that eventually need resealing. In the older streets around Church of St Botolph, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Walter's Ash is about 4 miles north-west of High Wycombe, in Buckinghamshire. Homes, rented property, offices and hotels in Walter's Ash can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our Buckinghamshire coverage runs to 263 places, and Walter's Ash is one of them. Reading is on our list too, about 18 miles from Walter's Ash.
We cover every part of HP14 for external mastic. You’ll find streets such as Main Road, Honey Way and Bradenham Wood Lane, all of which we cover. Neighbouring places we cover for external mastic include Naphill (1 mile south-east), Upper North Dean (1 mile north-east), Lower North Dean (1 mile east), Speen (1 mile north) and Bryant's Bottom (1 mile north-east). Further out, we also cover Aylesbury (10 miles north), High Wycombe (4 miles south-east), Chesham (8 miles east), Marlow (7 miles south), Amersham (8 miles east) and Beaconsfield (8 miles south-east).
Local landmarks in Walter's Ash
We work in homes and buildings around The Wheel pub and the streets around them. Walter's Ash’s nearest station is Saunderton station, roughly 1.5 miles west. A little further out are Wycombe Hospital (3.7 miles south-east) and High Wycombe Castle (3.5 miles south-east). Green spaces nearby include Prestwood Local Nature Reserve.
Common problems we fix in Walter's Ash
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
Signs it’s time to call us include:
- Rigid filler in a joint that should flex
- Old sealant gone brittle and cracked
- Joints where the bead has come unstuck
- Cracked joints where brick meets render or frames
Rented homes near Saunderton station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- Whether they’re fully insured
- What guarantee comes with the work
- When the joint can take water or movement
- Whether you can choose the colour
Different surfaces, different methods
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
What affects the cost of external mastic
The quote reflects the job in front of us. We look at:
- Whether there’s mould to deal with
- Access and height
- The size of the job
- The product the joint needs
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What to tell us for a quote
When you contact us, these details help:
- Any access issues, like height or stairs
- Whether it has been sealed before
- Photos by email, if that’s easy
- The type of property
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
The process
We keep the work tidy and contained to the joints we are treating, so you can get on with your day. Expect the work to take a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. Somewhere like Walter's Ash needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Keep pets and children clear of the area while we work
- Let us know about earlier repairs to the joints
Ask for a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.