Oxfordshire · England
Filchampstead External Mastic
External mastic in Filchampstead from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Sealant pulling away from one side of the joint
- Brick movement joints where the sealant has split
- Failed seals between different materials
External mastic for homes and businesses in Filchampstead
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we will confirm what access is needed. If you have old sealant gone brittle and cracked and movement joints with cracked, split or missing sealant, we can help, on copings & trims, joints between brick and frames and concrete & block alike.
Around Filchampstead, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Filchampstead (OX2)
- Wider area
- Oxfordshire
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What external mastic looks like in Filchampstead
With historic houses such as Appleton Manor (about 2.8 miles south) nearby, there’s older building stock in the area around Filchampstead as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For site and facilities teams at buildings such as Cumnor Church of England School (Voluntary Controlled), larger buildings have long runs of movement joint that eventually need resealing. Rented homes near Oxford station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Filchampstead is about 5 miles west of Oxford, in Oxfordshire. Jobs in Filchampstead get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Our area takes in 443 places across Oxfordshire.
Our applicators cover all of OX2 for external mastic and the streets around it. You will find streets such as Cumnor Road and Lower Whitley Road, all of which we cover. We also cover Farmoor (1 mile north), Cumnor (1 mile south-east), Chawley (1 mile south-east), Dean Court (1 mile east) and Swinford (2 miles north). We also work in nearby towns such as Oxford (5 miles east), Didcot (11 miles south-east), Bicester (13 miles north-east), Abingdon-on-Thames (6 miles south-east), Witney (7 miles west) and Carterton (11 miles west).
What’s near Filchampstead
Around Filchampstead, our work takes us to homes and buildings near Matthew Arnold School, among other places. For rail, the closest station is Oxford station, about 3.2 miles east of the centre. A little further out are Oxford University Press Museum (3.4 miles east) and Radcliffe Infirmary (3.6 miles east). Not far away are Lashford Lane Fen and Cumnor Hill.
What affects the cost of external mastic
Call for a quick quote. What matters most is:
- How many areas need sealing
- Working hours on commercial sites
- The size of the job
- Any mould that needs treating
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- How we’d reach the joints
- What’s wrong with the joints now
- Where the property is
- Whether it’s a home or a business
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.
Also in Filchampstead
Filchampstead: your questions answered
Do you cover smaller places like Filchampstead?
Yes, Filchampstead is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
I let a flat near Oxford station. Can you help?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
Can a movement joint be filled with mortar?
No. A mortar-filled joint cannot move, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
When will the joints need doing again?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Our work comes with a one-year guarantee.
What we are called out for in Filchampstead
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
Any of these means the joints need attention:
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
- Joints with sealant missing in places
If you live in an older home near St Mary's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Comparing quotes
- Whether the sealant suits the joint
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
- What insurance they hold
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Aftercare tips
So the new joints stay in good condition:
- Look over the joints every year, ideally after winter
- Tell anyone working on the walls about the movement joints
- Get split or bare joints resealed while the damage is small
- Keep high-pressure jets off the joints
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
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.
Different surfaces, different methods
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it.
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.
What happens on the day
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Filchampstead, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Clear the area around the work
- Let us know about earlier repairs to the joints
Getting a quote
Want a quote for external mastic? Please phone 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
When something else is needed
Before booking, it’s worth knowing the limits too:
- Rising or penetrating damp from elsewhere in the wall
- Subsidence or other structural problems
- Failed render or damaged cladding panels
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Façade panels
- Render & cladding joints