Essex · England
Boxted External Mastic
Movement joints in Boxted need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Rigid filler in a joint that should flex
- Leaking joints around cladding and façade panels
- Moss and dirt in joints with no sealant left
External mastic in Boxted, done properly
Low-level joints can usually be done from the ground. For joints higher up, give us some details of the building and we will confirm what access is needed. If you have plants rooting in failed movement joints and gaps where render, brick and frames meet, we can help, whatever the surface.
Around Boxted, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
The work is covered for a year after we finish. If anything isn’t right with it, ring 0345 464 0079 or email us.
- Where
- Boxted (CO4)
- Wider area
- Essex
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in Boxted
We work for letting agents and landlords as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
We also work for property managers and facilities teams in Boxted and across Essex. Several sites can be quoted together, and we are fully insured.
Signs you need external mastic in Boxted
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint can’t move, so the wall cracks somewhere else instead.
Any of these means the joints need attention:
- Old sealant gone brittle and cracked
- Sealant that has lost its bond to the brick or render
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
Homes close to Church of St Peter include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before you book
- Whether VAT is included
- Whether you can choose the colour
- What happens if they find a problem under the old sealant
- How much experience the applicator has
How we quote for external mastic
There’s no set price list, because no two jobs are the same. The quote depends on:
- Any mould that needs treating
- How easy the joints are to reach
- How much there is to do
- When we can work, for business premises
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The problem you’ve noticed
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
- The address or postcode of the job
Want a quote for external mastic? Please phone 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Check the sealant is paintable before painting near it
- Wash walls gently around the sealant
- Act on the first splits you see
- Make sure movement joints aren’t pointed over
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Once a joint cannot move, the wall finds another way, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Why act early in Boxted
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. In a small place like Boxted, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why us?
- Approved under the ARBOMaster scheme
- Any old sealant cut out fully, not covered over
- 20+ years of sealant experience
- We leave the area clean and tidy
Take a look at our cost guide or our reviews.
Common questions in Boxted
Is Boxted in your area for external mastic?
Yes. Our work covers London and the South East, and Boxted is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Do you work for landlords with property near Colchester station?
Yes, we work for letting agents and landlords. Just phone 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned.
Where do you work from?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
How long does external mastic last?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
What happens on the day
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to several days, depending on the building. For a village or hamlet like Boxted, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
- Let us know about earlier repairs to the joints
Getting a quote
We quote each job on its own. Simply phone 0345 464 0079 or email us and describe the job.
Related advice
Different surfaces, different methods
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.
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so neither cracks the other.
Places near Boxted
What else we do in Boxted
What external mastic looks like in Boxted
With historic houses such as Castle House (about 3.7 miles east) nearby, there’s older building stock in the area around Boxted as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Boxted St Peter's Church of England School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Rented homes near Colchester station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Boxted is about 4 miles north of Colchester, in Essex. Wherever you are in the CO4 postcode area, we can carry out external mastic at your property. Our area takes in 644 places across Essex. You can also see our page for Chelmsford, about 23 miles away.
All of CO4 is covered for external mastic, from the main roads to the quietest streets. Streets in the area include Church Road, Boxted Straight Road and Windmill Close, and we cover them all. Other places close to Boxted include Workhouse Hill (1 mile west), Boxted Cross (1 mile north-east), Langham (1 mile east), Hornestreet (1 mile east) and Thorington Street (2 miles north). Larger places within reach include Colchester (4 miles south), Clacton-on-Sea (15 miles south-east), Harwich (15 miles east), Camulodunum (5 miles south), Halstead (12 miles west) and Greenstead (4 miles south).
Local landmarks in Boxted
The closest station to Boxted is Colchester station, roughly 3.6 miles south of the centre. Other landmarks nearby include Severalls Hospital (2.4 miles south) and Colchester Castle (4.2 miles south). Open spaces near Boxted include Westhouse Wood.