Buckinghamshire · England
External Mastic in Fleet Marston
Our applicators work in Fleet Marston on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Old sealant gone brittle and cracked
- Joints pointed up with cement by mistake
- Weeds or debris growing in open joints
How we quote for external mastic
We do not publish a price list. The quote depends on:
- How easy the joints are to reach
- How many rooms, windows or areas are involved
- Which sealant suits the joint
- Mould in or behind the old joints
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What to tell us for a quote
When you call or email, it’s useful to know:
- Access, such as stairs, a lift or height
- Photos by email, if that is easy
- Any previous sealing or DIY work
- Where the property is
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and give you a clear quote before we start.
External mastic for homes and businesses in Fleet Marston
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. If you have old sealant gone brittle and cracked and leaking joints around cladding and façade panels, we can put it right, on joints between brick and frames, brickwork movement joints and render & cladding joints alike.
Around Fleet Marston, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water normally gets in, and they need the right sealant at the right depth.
There’s a 12-month guarantee on every job, large or small.
- Place
- Fleet Marston (HP18)
- Wider area
- Buckinghamshire
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Outside joints around Fleet Marston
With historic houses such as Waddesdon Manor (about 3.1 miles west) nearby, there’s older building stock in the area around Fleet Marston as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like Green Ridge Primary Academy? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to St Mary's Church include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Fleet Marston is about 2 miles north-west of Aylesbury, in Buckinghamshire. Every kind of property in Fleet Marston 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, roughly 17 miles from Fleet Marston.
Our applicators cover all of the HP18 postcode area for external mastic and the streets around it. Neighbouring places we cover for external mastic include Haydon Hill (1 mile south-east), Quarrendon Estate (2 miles east), Fairford Leys (2 miles south-east), Stone (2 miles south) and Hartwell (2 miles south). Within a short drive, we also cover High Wycombe (15 miles south), Chesham (14 miles south-east), Buckingham (12 miles north-west), Elmhurst (3 miles east), Southcourt (3 miles south-east) and Princes Risborough (8 miles south).
What’s near Fleet Marston
Locally, jobs take us to homes and businesses close to Buckinghamshire UTC, among other places. There’s a railway station in Fleet Marston itself: Aylesbury Vale Parkway station. Well-known places in the area include Roald Dahl Children's Gallery (2.5 miles south-east) and Friars Square (2.6 miles south-east).
The process
There is not much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to several days, depending on the building, including the tidy-up. For a village or hamlet like Fleet Marston, 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.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Tell us if parking is tricky
- Mention any tricky access
Getting a quote
For external mastic in Fleet Marston, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Related advice
When something else is needed
New sealant cannot fix everything, and we’d rather say so up front. It will not solve:
- Loose or hollow render, which needs re-rendering
- Cutting new joints into brickwork, which is building work rather than sealant work
- Subsidence or other structural problems
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
Where we work in Fleet Marston
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Concrete & block
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
For landlords and businesses
For anyone letting property in or around Fleet Marston, several properties can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together.
What happens if it’s left?
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so the old joint is cut out fully first. Older cottages and farmhouses around Fleet Marston can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start.
Why Fleet Marston clients choose us
- A sealant colour to suit the surroundings
- White, clear, grey or another colour, product permitting
- We’re fully insured
- Any old sealant cut out fully, not covered over
See our cost guide and our reviews.
Fleet Marston: your questions answered
Can you do external mastic in Fleet Marston?
Yes. We work across London and the South East, and Fleet Marston is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing.
Is Fleet Marston within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
What is a movement joint?
Walls move with heat, cold and moisture, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Do you have insurance?
Yes. We’re fully insured.
Where are you based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
Can you seal joints between render and window frames?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
Common problems we fix in Fleet Marston
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
These are the problems we’re asked about most:
- Old sealant gone brittle and cracked
- Failed seals between different materials
- Water getting into walls through failed joints
- Brick movement joints where the sealant has split
Letting a property close to Aylesbury Vale Parkway station? Then split movement joints are easy to miss on a rental until damp shows inside.
Before booking anyone
- What insurance they hold
- How the colour is chosen
- Whether they seal over old material or remove it
- How the joint is cleaned and prepared