Oxfordshire · England
External Mastic in Christmas Common
Movement joints in Christmas Common need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Weathered mastic that no longer stretches
- Joints where the bead has come unstuck
- Water getting into walls through failed joints
The process
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to several days, depending on the building. Somewhere like Christmas Common needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- 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.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Move anything stored near the joints
- Tell us about any water getting in
Get a quote
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or drop us an email with the details and send photos if you have them.
Related advice
External mastic for homes and businesses in Christmas Common
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall so the line blends in. If you’re dealing with damp patches traced to an open external joint and plants rooting in failed movement joints, we can help, on copings & trims, brickwork movement joints and render & cladding joints alike.
External sealant needs dry, clean surfaces, so work around Christmas Common is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
You’re 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
- Christmas Common (OX49)
- Wider area
- Oxfordshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about external mastic in Christmas Common
What guarantee comes with external mastic in Christmas Common?
All our work, in Christmas Common and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Can you do external mastic in Christmas Common?
Yes, Christmas Common is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Why do you put foam in the joint first?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before resealing.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
When is the sealant fully cured?
It depends on the product. Before we leave, we will tell you the cure time.
Is there any odour?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
External mastic in Christmas Common: local notes
Historic houses like Stonor Park (about 2.9 miles south-east) are a reminder that the area around Christmas Common 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. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Icknield Community College are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around Church of the Nativity, an extension built onto an older house moves differently, and the joint between them takes the strain.
Christmas Common is about 8 miles south of Thame, in Oxfordshire. Wherever you are in the OX49 postcode area, we can carry out external mastic at your property. Christmas Common is one of 443 places in Oxfordshire we cover. We also work in Reading, around 13 miles away.
Every address in OX49 is within our area for external mastic, from the main roads to the quietest streets. We also cover Northend (1 mile east), Howe Hill (1 mile south-west), Shirburn (2 miles north-west), Cookley Green (2 miles south-west) and Ibstone (2 miles east). Larger places within reach include Oxford (14 miles north-west), Didcot (12 miles west), Abingdon-on-Thames (14 miles west), Thame (8 miles north), Henley-on-Thames (7 miles south) and Benson (6 miles west).
Near you in Christmas Common
In Christmas Common, that means homes and buildings near Fox And Hounds Inn Public House. For a walk, there’s Bald Hill and Aston Rowant NNR.
Work for landlords, hotels and businesses
Landlords and agents in Christmas Common can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Loose or hollow render, which needs re-rendering
- Adding movement joints to masonry that has none
- Cracking across the wall rather than at a joint
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
- Concrete & block
Places near Christmas Common
What else we do in Christmas Common
DIY versus a professional finish
If you do try it yourself, take your time over the 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.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Why act early in Christmas Common
Resealing a run of joints in one go is normally better than patching one at a time. They’ve weathered the same way. Where a wall is exposed, as many are in small places like Christmas Common, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, call 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in Christmas Common
- 180+ five-star Google reviews
- Tidy, careful work
- White, clear, grey or coloured to suit, where the product allows
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide or customer reviews.
Different surfaces, different methods
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joint sealant has to cope with frequent movement. The sealant is chosen with that in mind.
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so the movement is taken up.
How to look after the new joints
Looking after new joints is easy, and it makes a real difference:
- Keep movement joints as flexible joints, not mortar
- Fix overflowing gutters above sealed joints
- Wash walls gently around the sealant
- Keep soil, plants and ivy away from the joints
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Small splits are the time to act. At that stage it’s a simple cut out and reseal.