Oxfordshire · England
External Mastic in Middle Assendon
Our applicators work in Middle Assendon on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Rain getting behind render or cladding at a joint
- Panel joints letting water in
- Weathered mastic that no longer stretches
External mastic in Middle Assendon, done properly
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product. If you are dealing with sealant that has lost its bond to the brick or render and movement joints with cracked, split or missing sealant, we can put it right, whatever the surface.
In a village or hamlet like Middle Assendon, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
You are covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Location
- Middle Assendon (RG9)
- Wider area
- Oxfordshire
- Guarantee
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
The process
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Middle Assendon, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Tell us about any water getting in
- Plan for the work area to be out of bounds to pets and children
- Tell us if parking is tricky
Get a quote
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
Related advice
Different surfaces, different methods
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. A primer goes on where the product requires one before the bead.
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Questions from Middle Assendon
Can you help a landlord with a rental near Henley-On-Thames station?
Yes. We work for landlords and letting agents as well as homeowners. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Will you come out to Middle Assendon?
Yes. Middle Assendon 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.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and you will get one quote.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Do you work at height?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
What does external mastic cost?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before any work starts.
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Keep movement joints as flexible joints, not mortar
- Keep soil, plants and ivy away from the joints
- Keep water from gutters off the wall
- Show decorators and builders where the movement joints are
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Leave it or put it right?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. Where a wall is exposed, as many are in small places like Middle Assendon, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
Why us?
- Fully insured
- 12-month guarantee on every job
- A choice of colours where the product allows
- Sealant colour chosen to suit
Take a look at how sealant jobs are priced and our reviews.
Towns and villages near Middle Assendon
More services for Middle Assendon
Honest limits
Before booking, it’s worth knowing the limits:
- Adding movement joints to masonry that has none
- Rising or penetrating damp from elsewhere in the wall
- Loose or hollow render, which needs re-rendering
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Façade panels
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
Walls and rooflines in Middle Assendon
Historic houses like Greys Court (about 1.8 miles south-west) are a reminder that the area around Middle Assendon 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. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Henley-On-Thames station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. In the older streets around Church of St James, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Middle Assendon is about 6 miles north of Caversham, in Oxfordshire. Jobs in Middle Assendon get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 443 places across Oxfordshire. There’s also a page for Reading, roughly 8 miles from Middle Assendon.
Work in RG9 works the same way as everywhere else we cover. You’ll find streets such as Fawley Bottom Lane and White Lane, and we cover them all. We also cover Bix (1 mile south-west), Fawley Bottom (1 mile north-east), Lower Assendon (1 mile south-east), Fawley (1 mile east) and Catslip (2 miles west). Within a short drive, we also cover Didcot (14 miles west), Thame (12 miles north), Henley-on-Thames (3 miles south-east), Benson (8 miles north-west), Chinnor (9 miles north) and Tilehurst (9 miles south-west).
Near you in Middle Assendon
We work in homes and buildings around Fawley Court and Temple Island and Rainbow Inn and the streets around them. Middle Assendon’s nearest station is Henley-On-Thames station, roughly 2.7 miles south-east. A little further out are Frazer Nash Archives (3.1 miles south-east). For a walk, there’s Warburg Nature Reserve.