Oxfordshire · England
External Mastic in Jericho
External mastic across Jericho and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Plants rooting in failed movement joints
- Weathered mastic that no longer stretches
- Cracked joints where brick meets render or frames
Why it’s worth doing now in Jericho
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and does not last so it’s worth doing right. In a smaller place like Jericho, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Why choose Mr Mastic in Jericho
- You choose the colour before work begins
- A sealant colour to suit the surroundings
- Domestic, commercial and hotel work
- ARBOMaster approved applicator
External mastic in Jericho, done properly
For buildings in Jericho, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. If you are dealing with plants rooting in failed movement joints and failed seals between different materials, we can help.
In and around Jericho, older properties sit alongside newer ones, each with its own outside joints. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
Your job is guaranteed for a year, as with all our work.
- Where
- Jericho (OX1, OX2)
- Wider area
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
For anyone letting property in or around Jericho, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Jericho questions
Do you cover Jericho for external mastic?
Yes. Our work covers London and the South East, and Jericho is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Can you help a landlord with a rental near Oxford station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Can new sealant go over the old?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
What is a movement joint?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
How much does external mastic cost in Jericho?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used.
Where are you based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Are you insured?
Yes. Full insurance covers our work.
Surface by surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant.
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. We prime where the sealant needs it before sealing.
How it works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes a few hours to a few days, depending on the length of joint and the access, including the tidy-up. In a smaller place like Jericho, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Mention if the joints have been sealed before
- Let us know about stairs, lifts or work at height
- Move anything stored near the joints
Getting a quote
For a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
Read more
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Mould in or behind the old joints
- How many areas need sealing
- How much old sealant there is and how hard it is to remove
- The size of the job
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. We give a clear quote before we start.
What we need to know
Before you ask for a quote, have a think about:
- A few photos by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
- Where the property is
Asking for a quote is easy: let us know what needs doing and where. A few photos by email make the job easier to understand, and we will take it from there.
Common problems we fix in Jericho
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Signs it’s time to call us include:
- Moss and dirt in joints with no sealant left
- Joints where the bead has come unstuck
- Leaking joints around cladding and façade panels
- Hard, crazed mastic that has stopped moving
Managing a site like St Barnabas' Church of England Aided Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- Which sealant they’ll use, and why
- How the colour is chosen
- Is VAT in the price?
- How long the guarantee is
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Show decorators and builders where the movement joints are
- Keep movement joints as flexible joints, not mortar
- Keep high-pressure jets off the joints
- Look over the joints every year, ideally after winter
Do not let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
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, all bigger jobs than a reseal.
Jericho buildings and the weather
Historic houses like Holywell Manor (about 0.9 miles east) are a reminder that the area around Jericho 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to St Barnabas Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. If you let a flat or house near Oxford station, outside joints that have cracked can let damp into a rental, so check them between lets.
Jericho is about 2 miles west of Oxford, in Oxfordshire. Jericho gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Across Oxfordshire, we cover 443 places, and Jericho is one of them.
Our applicators cover all of OX1 and OX2 for external mastic and the streets around it. If you need external mastic at a property on Abbey Road, Combe Road and Pusey Lane or a nearby road, our applicators can take on the job. Main roads around Jericho include the A4144, which makes travel easy. Close by, we work in Walton Manor (1 mile north), St John Street area (1 mile south-east), Park Town (1 mile north-east), Norham Manor (1 mile north-east) and Osney (1 mile south-west). Within a short drive, we also cover Didcot (10 miles south), Bicester (11 miles north-east), Abingdon-on-Thames (6 miles south), Witney (10 miles west), Carterton (14 miles west) and Thame (13 miles east).
Landmarks near Jericho
Typical jobs here are in homes near Oxford University Parks, The Rickety Press pub and The Eckersley School of English and the streets around them. Also close by are Oxford Academy (1.1 miles north) and Somerville College Library (within half a mile east). The nearest railway station is Oxford station, about 0.5 miles south. Nearby you will also find Oxford University Press Museum (under half a mile south-east) and Clarendon Shopping Centre (0.7 miles south-east). The countryside around Jericho includes Hook Meadow and The Trap Grounds and Harcourt Hill.