Buckinghamshire · England
External & façade joints in Thorney, Buckinghamshire
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Thorney and across Buckinghamshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cracked joints where brick meets render or frames
- Rain getting behind render or cladding at a joint
- Moss and dirt in joints with no sealant left
About our external mastic in Thorney
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We take the old material out and do it properly. We work on concrete & block, façade panels and copings & trims, and people most often call us about panel joints letting water in and moss and dirt in joints with no sealant left.
Older homes in small places like Thorney may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
You get a one-year guarantee, the same in Thorney as everywhere else we work.
- Place
- Thorney (SL0)
- Wider area
- Buckinghamshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best year round.
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one.
Landlord and commercial work in Thorney
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
What external mastic looks like in Thorney
With historic houses such as Ickenham Hall (about 4.6 miles north-east) nearby, there’s older building stock in the area around Thorney 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. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Iver station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to St. Leonard's include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. For site and facilities teams at buildings such as St Catherine Catholic Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Thorney is about 3 miles south-west of Hillingdon, in Buckinghamshire. Jobs in Thorney get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Across Buckinghamshire, we cover 263 places, and Thorney is one of them. There’s also a page for London, roughly 17 miles from Thorney.
All of SL0 is within our area for external mastic. If you’re just outside Thorney, we cover West Drayton (1 mile east), Yiewsley (1 mile north-east), Cowley (2 miles north), Uxbridge (3 miles north) and Hillingdon (3 miles north-east). We also work in nearby towns such as High Wycombe (14 miles north-west), Chesham (15 miles north), Marlow (13 miles west), Amersham (13 miles north), Beaconsfield (10 miles north-west) and Chalfont St Peter (8 miles north).
Around Thorney
Around Thorney, our work takes us to homes and buildings near The North Star pub and Stockley Academy. The closest station to Thorney is Iver station, about 0.7 miles north-west. Other landmarks nearby include The Pavilions (3 miles north) and Hillingdon Hospital (2 miles north-east). Green spaces nearby include Uxbridge Moor and Staines Reservoirs.
Questions from Thorney
Do you cover Thorney for external mastic?
Yes. Our work covers London and the South East, and Thorney is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear price.
Is Thorney within the area you cover?
Yes. Thorney is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
What is backing rod for?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
How long should I leave it?
Different products cure at different speeds, so please follow the time we give you.
Where are you based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Is there a guarantee?
Yes. All our work carries our 12-month guarantee.
Do you work for landlords and businesses?
Yes. We work in homes, commercial premises and hotels, and we are fully insured.
What is a movement joint?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
How we quote for external mastic
The quote reflects the job in front of us. We look at:
- How many areas need sealing
- Mould in or behind the old joints
- When we can work, for business premises
- The size of the job
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts.
Helping us quote
You do not need to know the technical terms. It helps if you can tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
- Whether it has been sealed before
- How we’d reach the joints
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and send you a clear quote before work begins.
Can I do it myself?
If you are 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 fails, we can still redo it.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours for a handful of joints, longer for a whole elevation. In a small place like Thorney, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Clear items away from the joints we’re working on
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Read more
How to look after the new joints
Simple care keeps the joints in good condition. Our advice:
- Act on the first splits you see
- Keep high-pressure jets off the joints
- Show decorators and builders where the movement joints are
- Make sure movement joints aren’t pointed over
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick which cost more to put right than the joint.
Also near Thorney
Other services in Thorney
When it is not the sealant
In fairness, there are a few things sealant will not fix:
- Rising or penetrating damp from elsewhere in the wall
- Movement that’s more than a sealant joint can take
- Render that’s blown, hollow or coming away
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Concrete & block
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Copings & trims
- Joints between brick and frames