Oxfordshire · England
Lyneham External Mastic
We cover Lyneham for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Rigid filler in a joint that should flex
- Weeds or debris growing in open joints
- Cracked joints where brick meets render or frames
How we handle external mastic in Lyneham
On houses, flats and commercial buildings across Lyneham, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean joint faces and the right depth. If you are dealing with damp patches traced to an open external joint and gaps where render, brick and frames meet, we can help, whatever the surface.
Older homes in small places like Lyneham may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
A 12-month guarantee comes as standard.
- Location
- Lyneham (OX7)
- Wider area
- Oxfordshire
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and helps it last.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that is happened, we rake it out and reseal it properly.
Signs you need external mastic in Lyneham
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint.
It’s worth asking for a quote if you see:
- Moss and dirt in joints with no sealant left
- Panel joints letting water in
- Water getting into walls through failed joints
- Weathered mastic that no longer stretches
Letting a property close to Shipton station? Then split movement joints are easy to miss on a rental until damp shows inside.
Before you book anyone
- Is VAT in the price?
- What product goes in the joint
- Are they insured?
- Who does the work, and how experienced they are
External mastic in Lyneham: local notes
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.
Around Lyneham, as everywhere, external mastic is only as good as the preparation behind it.
Lyneham is about 8 miles north of Carterton, in Oxfordshire. Whether you’re in the middle of Lyneham or further out, external mastic is available for homes and businesses alike. Our area takes in 443 places across Oxfordshire, from the larger towns to small villages. We also work in Oxford, about 18 miles from Lyneham.
Here we cover the OX7 postcode area for external mastic. Neighbouring places we cover for external mastic include Shipton-under-Wychwood (2 miles south), Ascott Earl (2 miles south-east), Ascott-under-Wychwood (2 miles south-east), Ascott d'Oyley (2 miles south-east) and Chilson (3 miles east). Larger places within reach include Witney (8 miles south-east), Carterton (8 miles south), Kidlington (14 miles east), Chipping Norton (5 miles north-east), Woodstock (11 miles east) and Cogges (8 miles south-east).
What’s near Lyneham
The closest station to Lyneham is Shipton station, about 1.1 miles south of the centre.
The process
There’s no need to move everything out before we come, only the area right around the joints. Everything nearby is protected, and the work takes a few hours to a few days, depending on the length of joint and the access for a typical job. Somewhere as small as Lyneham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Mention any parking rules near the property
- Keep children and pets away from the work area
- On commercial sites, let us know about site rules
Get a quote
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, call 0345 464 0079 or drop us an email.
Read more
Places near Lyneham
What else we do in Lyneham
Landlord and commercial work in Lyneham
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.
For anyone letting property in or around Lyneham, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Walk round the building once a year and look at the joints
- Wash walls gently around the sealant
- Never let anyone fill a movement joint with mortar
- Keep water from gutters off the wall
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage.
Lyneham questions
Will you come out to Lyneham?
Yes, Lyneham is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
I let a flat near Shipton station. Can you help?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Why do you put foam in the joint first?
We fit closed-cell backing rod wherever the joint depth needs controlling. It controls the depth and stops the sealant bonding to the back, so the joint can move.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year and renew it when it starts to fail.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
How we quote for external mastic
For a quick quote, just ask. What matters most is:
- The number of rooms or windows
- When we can work, for business premises
- The size of the job
- Whether the work is at height
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- How we’d reach the joints
- Roughly how big the job is
- Where the property is
- If it’s domestic, commercial or a hotel
To get a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.