Buckinghamshire · England
Chalkshire External Mastic
External mastic for Chalkshire, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Weathered mastic that no longer stretches
- Panel joints letting water in
- Movement joints with cracked, split or missing sealant
What affects the quote in Chalkshire
Call for a quick quote. The main things that affect it are:
- How much there is to do
- The old material and how stubborn it is
- Access and height
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
What to tell us when you ask for a quote:
- Where the property is
- Photos by email, if that’s easy
- Access, such as stairs, a lift or height
- The problem you’ve noticed
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. We will explain what we’d do and give you a clear quote before we start.
How we handle external mastic in Chalkshire
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. We work on copings & trims, render & cladding joints and façade panels, and the jobs we see most are joints with sealant missing in places and cracked joints where brick meets render or frames.
In a village or hamlet like Chalkshire, older cottages and farm buildings often stand in the open, 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.
- Place
- Chalkshire (HP17)
- Region
- Buckinghamshire
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Walls and rooflines in Chalkshire
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as John Colet School, its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Little Kimble station, outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as Church of St Peter and St Paul, an extension built onto an older house moves differently, and the joint between them takes the strain.
Chalkshire is about 4 miles south of Aylesbury, in Buckinghamshire. Homes, rented property, offices and hotels in Chalkshire is covered for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Our area takes in 263 places across Buckinghamshire, from the larger towns to small villages. There’s also a page for Oxford, about 19 miles away.
Jobs for external mastic in HP17 works the same way as everywhere else we cover. Close by, we work in Terrick (1 mile north), Butler's Cross (1 mile south), Nash Lee (1 mile north), Ellesborough (1 mile south-west) and Coombe (1 mile south). Larger places within reach include Aylesbury (4 miles north), High Wycombe (9 miles south), Chesham (8 miles south-east), Marlow (13 miles south), Amersham (10 miles south-east) and Beaconsfield (12 miles south-east).
Local landmarks in Chalkshire
Locally, jobs take us to homes and businesses close to The Russell Arms. Chalkshire’s nearest station is Little Kimble station, about 1.3 miles south-west of the centre. A little further out are Little Kimble Motte (1.1 miles south-west) and Stoke Mandeville Hospital (2.7 miles north). For a walk, there’s Brush Hill Local Nature Reserve and Coombe Hill.
When it is not the sealant
To be straight with you, there are a few things sealant won’t fix:
- Movement that is more than a sealant joint can take
- Damp that isn’t coming from the joint
- Cutting new joints into brickwork, which is building work rather than sealant work
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Where we work in Chalkshire
- Concrete & block
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Keep soil, plants and ivy away from the joints
- Look over the joints every year, ideally after winter
- Keep water from gutters off the wall
- Wash walls gently around the sealant
Don’t paint over the new sealant unless we’ve said the product is paintable. Paint can crack on a flexible joint and spoil the finish.
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.
What happens if it’s left?
A failed movement joint lets water into the wall. Resealing early keeps the job to the joint itself, rather than the wall around it. Older cottages and farmhouses around Chalkshire can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. We give a clear quote before we start, so you know where you stand.
What you get with us
- Homes, businesses and hotels
- White, clear, grey or coloured to suit, where the product allows
- Fully insured
- Anti-fungal silicone where joints get wet
Landlord and commercial work in Chalkshire
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
How the visit works
We keep the work tidy and contained to the joints we are treating. The job normally takes anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Somewhere as small as Chalkshire, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs 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
- Keep pets and children clear of the area while we work
- Let us know about parking restrictions
- Let us know if you’ve seen damp or leaks
Getting a quote
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or send us an email.
Read more
What the job involves on each surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
FAQs for Chalkshire
Can you help a landlord with a rental near Little Kimble station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Do you cover smaller places like Chalkshire?
Yes, Chalkshire is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll tell you what we’re using.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose, and the wall may crack nearby. A flexible sealant is the right fill.
Can you seal joints between two different materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Is there any odour?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.