Essex · England
Ashdon External Mastic
Professional external mastic in and around Ashdon, with every bit of old sealant taken out first and a one-year guarantee.
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
- Sealant that has lost its bond to the brick or render
Quotes for external mastic in Ashdon
We do not publish a price list, because no two jobs are the same. What we look at:
- The size of the job
- Mould in or behind the old joints
- The type of sealant required
- The number of rooms or windows
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
What to tell us for a quote
To make quoting easier, please include:
- The rough size of the job
- If someone has resealed it before
- Photos by email, if that is easy
- The problem you’ve noticed
Need a quote? Please phone 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and send you a clear quote before work begins.
External mastic in Ashdon, done properly
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two. If you have gaps where render, brick and frames meet and brick movement joints where the sealant has split, we can put it right, whatever the surface.
Somewhere as small as Ashdon, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Where
- Ashdon (CB10)
- Region
- Essex
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
It helps to know what we can’t do:
- Rising or penetrating damp from elsewhere in the wall
- Cutting new joints into brickwork, which is building work rather than sealant work
- Render that is blown, hollow or coming away
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
Where we work in Ashdon
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
- Façade panels
The process
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Ashdon, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- 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.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Mention any sign-in or site rules at work premises
- Mention any leaks or damp you’ve noticed
- Tell us about any previous sealing or DIY attempts
How to get a quote
We quote each job on its own. Simply call 0345 464 0079 or send us an email and describe the job.
Read more
Questions from Ashdon
Is external mastic in Ashdon guaranteed?
Every job comes with our one-year guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you cover Ashdon for external mastic?
Yes. Our work covers London and the South East, and Ashdon is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear price.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
What is backing rod for?
That’s backing rod, a closed-cell foam. It stops the sealant going in too deep and bonding to three sides.
Do you work for letting agents?
Yes, regularly. Several properties can be quoted together, and between tenancies is a good time for the work.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Where is Mr Mastic based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
How the job changes by surface
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Deal with leaking gutters that soak the joints below
- Ask before painting over external sealant
- Avoid pressure-washing directly into sealant joints
- Tell anyone working on the walls about the movement joints
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Once a joint cannot move, the wall finds another way, generally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Why deal with it now?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Older cottages and farmhouses around Ashdon can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why us?
- Tidy, careful work
- Rated 4.9 stars on Google
- Any old sealant cut out fully, not covered over
- ARBOMaster approved applicator
See what affects the cost and our reviews.
Also near Ashdon
More services for Ashdon
Work for landlords, hotels and businesses
We work for landlords and agents as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
External mastic in Ashdon: local notes
Historic houses like Audley End House (about 4.7 miles south-west) are a reminder that the area around Ashdon has older buildings as well as new. Where a home is older, 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.
If you look after a building such as Ashdon Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you live in an older home near Church of All Saints, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Ashdon is about 4 miles north-east of Saffron Walden, in Essex. Wherever you are in the CB10 postcode area, we cover external mastic for homes and businesses. Our area takes in 644 places across Essex. We also work in Chelmsford, around 23 miles away.
All of CB10 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on Dorvis Lane, Carters Croft and Radwinter Road or a nearby road, our applicators can take on the job. Nearby, we also carry out external mastic in Steventon End (1 mile east), Church End (1 mile south-west) and The Common (3 miles south-east). We also work in nearby towns such as Saffron Walden (4 miles south-west), Great Dunmow (13 miles south), Stansted Mountfitchet (12 miles south-west), Elsenham (10 miles south), Sible Hedingham (13 miles south-east) and Church End (12 miles south).
What’s near Ashdon
We work in homes and buildings around Rose And Crown Inn and the streets around them. Well-known places in the area include Saffron Walden Museum (3.8 miles south-west) and Castle Camps (2.4 miles east). Green spaces nearby include Hales and Shadwell Woods and Rivey Hill.