Oxfordshire · England
Marston External Mastic
Our applicators work in Marston on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Weeds or debris growing in open joints
- Brick movement joints where the sealant has split
- Cracked joints where brick meets render or frames
External mastic for homes and businesses in Marston
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. We’re often asked to deal with leaking joints around cladding and façade panels and movement joints filled with mortar instead of sealant, on façade panels, concrete & block and copings & trims.
Older homes in small places like Marston may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water usually gets in, and they need the right sealant at the right depth.
Big or small, you get the same one-year guarantee.
- Place
- Marston (OX3, OX2)
- Wider area
- Oxfordshire
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. Typically it takes a few hours to a few days, depending on the length of joint and the access, and the area is left clean. In a small place like Marston, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Mention any leaks or damp you’ve noticed
- Mention if the joints have been sealed before
- Let us know about parking restrictions
How to get a quote
We quote each job on its own, so start by telling us what you need. Just call 0345 464 0079 or email us with the details and send pictures if you have them.
Advice
Walls and rooflines in Marston
With historic houses such as Holywell Manor (about 1.5 miles south) nearby, there’s older building stock in the area around Marston as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of St Nicholas, the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Oxford station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Marston is about 2 miles north of Oxford, in Oxfordshire. Every kind of property in Marston can book us for external mastic, old or new, large or small. The work is guaranteed for a year. Our Oxfordshire coverage runs to 443 places, and Marston is one of them.
Every address in OX3 and OX2 is within our area for external mastic, from the main roads to the quietest streets. Local streets include Back Lane, Mill Lane and Butts Lane. If you’re just outside Marston, we cover Northway (1 mile south-east), New Marston (1 mile south), Norham Manor (1 mile south-west), Summertown (1 mile west) and North Oxford (1 mile west). Larger places within reach include Didcot (12 miles south), Bicester (9 miles north), Abingdon-on-Thames (7 miles south), Witney (11 miles west), Carterton (15 miles west) and Thame (12 miles east).
What’s near Marston
Locally, jobs take us to homes and businesses close to Oxford University Parks, Oxford Academy and Swan School and the streets around them. Nearby too are Victoria Arms (0.5 miles west) and St Hugh's College Main Building Including Library (1.3 miles south-west). The nearest railway station is Oxford station, roughly 2.2 miles south-west. Well-known places in the area include Pitt Rivers Museum (1.5 miles south-west) and Oxford Castle (2.1 miles south-west). Not far away are Headington Hill and Hook Meadow and The Trap Grounds.
What sealant work cannot fix
A few problems are outside what sealant work can do:
- Movement that’s more than a sealant joint can take
- Render that’s blown, hollow or coming away
- Rising or penetrating damp from elsewhere in the wall
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Where we work in Marston
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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. Everything old must be removed first.
Common problems we fix in Marston
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
The most common problems we see are:
- Damp patches traced to an open external joint
- Panel joints letting water in
- Moss and dirt in joints with no sealant left
- Movement joints filled with mortar instead of sealant
Schools such as St Nicholas Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- How long to leave it before use
- What the quote includes, VAT included or not
- Whether all the old sealant comes out first
- How the joint is cleaned and prepared
Marston questions
Can you do external mastic in Marston?
Yes. We work across London and the South East, and Marston is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Will you come out to Marston?
Yes, Marston 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.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses.
Why is there a gap in my brick wall?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move and needs a flexible seal, not mortar.
Do you work for landlords and businesses?
Yes, regularly. Several properties can go on one quote.
Will there be a smell?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
Can you reach joints on upper floors?
Each building is different. Send us pictures and a rough idea of the height.
Towns and villages near Marston
More services for Marston
Why act early in Marston
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together and it means sorting access once. In a small place like Marston, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Doing several joints on one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
Why book with us
- You choose the colour before work begins
- Anti-fungal silicone where joints get wet
- 180+ five-star Google reviews
- Trusted Arbo and Everbuild sealants
Read our cost guide or our reviews.
Work for landlords, hotels and businesses
We work for landlords and agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
What affects the quote in Marston
The price is agreed before any work begins. It takes into account:
- Any mould that needs treating
- Whether the work is at height
- The product the joint needs
- The old material and how stubborn it is
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or email us.
What we need to know
What to tell us when you ask for a quote:
- Pictures of the joints, sent by email
- Where the property is
- The problem you’ve noticed
- The type of property
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will talk you through the work.