Oxfordshire · England
External & façade joints in Murcott, Oxfordshire
Professional external mastic in and around Murcott, with old sealant always removed completely.
- Sealant pulling away from one side of the joint
- Leaking joints around cladding and façade panels
- Damp patches traced to an open external joint
What we cannot put right
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Structural movement, which needs a surveyor or engineer
- Failed render or damaged cladding panels
- Rising or penetrating damp from elsewhere in the wall
If you’re not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Joints and surfaces we work on
- Façade panels
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
How we handle external mastic in Murcott
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a colour to suit. We work on joints between brick and frames, concrete & block and brickwork movement joints, and common reasons people get in touch are moss and dirt in joints with no sealant left and leaking joints around cladding and façade panels.
Outside joints can only be sealed when they’re dry, so work in Murcott is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
You get a 12-month guarantee, the same in Murcott as everywhere else we work.
- Where
- Murcott (OX5)
- Wider area
- Oxfordshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Murcott
More services for Murcott
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Murcott and across Oxfordshire. Several sites can be quoted together, and we are fully insured.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
How to look after the new joints
After the cure time, these simple habits help:
- Make sure movement joints aren’t pointed over
- Check external joints each spring
- Do not let climbing plants root in the sealant
- Check the sealant is paintable before painting near it
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
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.
How it works
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. The job generally takes a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Murcott, 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.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
We do not publish a price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To get started, call 0345 464 0079 or drop us an email.
Read more
Murcott buildings and the weather
Historic houses like Boarstall Tower (about 2.7 miles east) are a reminder that the area around Murcott has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. 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.
If you let a flat or house near Islip station, outside joints that have cracked can let damp into a rental, so check them between lets.
Murcott is about 4 miles south of Bicester, in Oxfordshire. If you need external mastic in Murcott, it’s easy to get a quote: please ring 0345 464 0079 or send us an email. We’re based in Crawley and cover Oxfordshire, Murcott included. Murcott is one of 443 towns and villages in Oxfordshire where we work. For nearby work, see our Oxford page (7 miles or so).
We cover every part of the OX5 postcode area for external mastic and the streets around it. Close by, we work in Fencott (1 mile north-west), Merton (1 mile north-west), Charlton-on-Otmoor (1 mile west), Upper Arncott (2 miles north-east) and Lower Arncott (2 miles north-east). We also work in nearby towns such as Oxford (7 miles south-west), Bicester (4 miles north), Abingdon-on-Thames (12 miles south-west), Witney (15 miles west), Thame (10 miles south-east) and Kidlington (6 miles west).
What’s near Murcott
The nearest railway station is Islip station, roughly 3.7 miles west. Other landmarks nearby include Bicester Community Hospital (4.1 miles north) and Bicester Avenue (3.5 miles north). The countryside around Murcott includes Otmoor RSPB reserve and Graven Hill.
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Common questions in Murcott
Do you cover smaller places like Murcott?
Yes, we do. Our work covers 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 Islip station. Can you help?
Yes. We work for landlords and agents as well as householders. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
How do you reach high-level joints?
That depends on the building and the joints. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose. We’ll reseal it with a flexible sealant.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Where are you based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Signs you need external mastic in Murcott
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall.
Look out for any of the following:
- Brick movement joints where the sealant has split
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
- Weathered mastic that no longer stretches
Historic houses such as Boarstall Tower, about 2.7 miles east, show how far back building around Murcott goes, and older homes nearby need a sealant that suits their walls.
Before booking anyone
- Is VAT in the price?
- When the joint can take water or movement
- How much experience the applicator has
- How the colour is chosen
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. Where a wall is exposed, as many are in small places like Murcott, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why choose Mr Mastic in Murcott
- 20+ years of sealant experience
- We are fully insured
- Every job guaranteed for a year
- We leave the area clean and tidy
Take a look at our cost guide or customer reviews.